IAD - SEA

$90 Find Cheap Flights from Washington Dulles Airport to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Seattle departing on 3/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Seattle.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Seattle.
In the last 7 days travelers have searched 41,299,237 times on KAYAK, and here is why:

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Cheap Flight Deals from Washington Dulles Airport to Seattle (IAD-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington Dulles Airport to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Dulles Intl to Seattle

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Dulles Intl to Seattle.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
4:05 pm - 7:06 pmIAD-SEA
6h 01mnonstop
7:10 am - 3:10 pmSEA-IAD
5h 00mnonstop
$277Delta
Find Deal
Sat, Jan 25 - Sat, Feb 1
6:57 pm - 10:00 pmIAD-SEA
6h 03mnonstop
9:54 am - 5:57 pmSEA-IAD
5h 03mnonstop
$282Alaska Airlines
Find Deal
Wed, Jan 29 - Fri, Jan 31
5:25 pm - 9:23 amIAD-SEA
18h 58m1 stop
9:50 am - 5:48 pmSEA-IAD
4h 58mnonstop
$286Alaska Airlines
Find Deal
Wed, Feb 12 - Wed, Feb 19
5:30 pm - 8:31 pmIAD-SEA
6h 01mnonstop
7:00 am - 8:40 pmSEA-IAD
10h 40m1 stop
$292United Airlines
Find Deal
Mon, Jan 27 - Mon, Feb 3
1:52 pm - 9:18 pmIAD-SEA
10h 26m1 stop
11:54 am - 10:33 pmSEA-IAD
7h 39m1 stop
$294American Airlines
Find Deal
Wed, Feb 12 - Wed, Feb 19
6:32 am - 1:32 pmIAD-SEA
10h 00m1 stop
8:00 am - 4:06 pmSEA-IAD
5h 06mnonstop
$297United Airlines
Find Deal
Sun, Jan 19 - Sun, Jan 26
7:30 am - 10:24 amIAD-SEA
5h 54mnonstop
10:00 pm - 6:03 amSEA-IAD
5h 03mnonstop
$307Delta
Find Deal
Sat, Apr 26 - Sat, May 3
1:53 pm - 11:31 pmIAD-SEA
12h 38m2 stops
11:43 am - 10:41 pmSEA-IAD
7h 58m1 stop
$311American Airlines
Find Deal
Mon, Jan 27 - Mon, Feb 3
11:05 am - 10:51 pmIAD-SEA
14h 46m1 stop
11:59 pm - 11:07 amSEA-IAD
8h 08m1 stop
$355Sun Country Air
Find Deal
Thu, Apr 3 - Sun, Apr 6
12:40 pm - 5:32 pmIAD-SEA
7h 52m1 stop
11:59 pm - 11:43 amSEA-IAD
8h 44m1 stop
$360Sun Country Air
Find Deal
Wed, Jun 11 - Wed, Jun 25

Flights from Dulles Intl to Seattle - Travel Insights & Trends

Get data-powered insights and trends into flights from Dulles Intl to Seattle to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Washington Dulles Airport to Seattle?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to Seattle clicked on KAYAK for each day over the last 12 months.
For Washington Dulles Airport to Seattle, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Seattle back to Washington Dulles Airport, the best deals are generally found on Tuesday, with Sunday being the most expensive.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Seattle is February, where tickets cost $347 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $526 and $496 respectively.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Seattle?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.
Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $313 on average.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to Seattle, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know

Low season

January

High season

July

Cheapest flight

$90
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 16% increase in price.
Flight from Washington Dulles Airport to Seattle

When to book flights from Dulles Intl to Seattle

Are your dates flexible? Find out the best times to travel from Dulles Intl to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Dulles Intl to Seattle: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew the route from Dulles Intl to Seattle 
Verified travelerFlew with Alaska AirlinesIAD-SEASep 2024
Pay the money if can afford to upgrade your seats
Verified travelerFlew with Alaska AirlinesIAD-SEAJul 2024
Dulles, like Seattle has a tram. That can be surprising. The TSA at Seattle is notoriously LONG, however, both times in the last year that I have flown, that has not been the case. At Dulles, the TSA lines were efficient as well. The airport interior is well marked for getting around. I did note that the garbages were full in the Southwest and Alaska areas- as we were there 6 hours and had lots of time to notice nit-picky things that nobody else would care about :). It was convenient to have a "charging station" nearby the Alaska waiting area (right across from our gate). It had 3 ports, and I noticed that as soon as I unplugged mine, it was jumped right on. Suggestion- have Dulles add a few more for passengers who need to recharge phones. Great experience, thank you.
MarylinFlew with DeltaIAD-SEAMar 2024
Delta by far is a great airline, they’re fast and great staff. I just wish they had a little more snacks
Verified travelerFlew with Alaska AirlinesIAD-SEAMay 2024
Get to the airport early, especially on holidays

FAQs for booking Washington Dulles Airport to Seattle flights

  • How can I get from the Sea-Tac Airport (SEA) to my hotel in downtown Seattle?

    There are a few options to get you from the airport to your hotel in downtown Seattle. One option is the subway system that picks up passengers on the 4th floor of the parking garage. There are a couple of bus services at the Sea-Tac Airport. King County Metro travels to various parts of the city of Seattle while Sound Transit takes passengers to the outlining cities of Bellevue and Renton. The buses pick up by the subway station.

  • Where can I park my car long-term at the Washington Dulles Airport?

    Very close to the terminal, there is a parking garage and a terminal parking lot. There is also an economy lot a little further away. A shuttle service will take you from the economy lot to the main terminal of the airport.

  • What restaurants are at the Washington Dulles Airport?

    There are a couple of bars, a pizzeria, and a burger place where you can dine. Some well-known restaurants in this airport include Auntie Anne's, Carrabba's Italian Grill, Chick-Fil-A, and Jersey Mike's Subs.

  • What lounges are at these two airports?

    Both airports have lounges where you can enjoy some quiet time. These lounges also offer complimentary drinks and snacks. They are sponsored by airlines, credit card companies, or the airport. At the Washington Dulles Airport, there is a United Airlines, British Airways, and an Air France lounge. The Sea-Tac Airport has lounges affiliated with United Airlines, American Express, Delta Airlines, and Alaska Airlines.

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to Seattle?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Seattle was $90 for a one-way ticket and $277 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and Seattle?

    A passport is not required to fly from Washington Dulles Airport to Seattle.

  • Which airports will I be using when flying from Washington Dulles Airport to Seattle?

    Washington Dulles Airport and Seattle are both served by 1 main airport. You will leave Washington Dulles Airport from Washington, D.C. Dulles Intl and will be arriving at Seattle/Tacoma Intl.

  • Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to Seattle?

    Alaska Airlines, Delta, and American Airlines offer inflight Wi-Fi service on the Washington Dulles Airport to Seattle flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Seattle?

    The Boeing 737-900 is the aircraft model that flies most regularly on the Washington Dulles Airport to Seattle flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to Seattle?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between Washington Dulles Airport and Seattle, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Washington Dulles Airport to Seattle?

    There are nonstop flights from Washington Dulles Airport to Seattle on a daily basis.

  • Which is the best airline for flights from Washington, D.C. to Seattle, Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Seattle are Alaska Airlines and Delta. With an average price for the route of $427 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $394 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington Dulles Airport to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Washington Dulles Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington Dulles Airport to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from Washington, D.C. Dulles Intl Airport to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for $293 or less one-way and $384 or less round-trip.
  • You can book a nonstop flight from Washington Dulles Airport (IAD) to the Seattle-Tacoma International Airport (SEA). However, there are some flight routes that will require you to switch planes in either Salt Lake City, Dallas-Fort Worth, or San Francisco.
  • The Washington Dulles International Airport (IAD) has a simple layout. It has one main terminal that connects to four concourses from which departure and arrival flights are managed. To assist passengers with getting around, the airport is equipped with moving walkways, escalators, and elevators. It also has a people mover system that is known as the AeroTrain, it goes from one side of the airport to another.
  • The SEA underground makes it easy to get around the Seattle-Tacoma International Airport (SEA). This is a people mover system or tram that goes around the airport including the main terminal, the north terminal, the south terminal, and the four concourses.
  • There is lots to do and see at the Seattle-Tacoma International Airport. You can explore African culture in the Africa Lounge. Here you can enjoy African-inspired drinks and food. Throughout the year, the airport hosts live musical concerts. These concerts take place in the central terminal, in front of Sub Pop Records, and close to the children's play area.
  • Numerous rental car agencies have offices at the Sea-Tac Airport. This includes Budget, Dollar, Hertz, and Thrifty just to name a few. The rental car center is located offsite. However, there is a shuttle bus that will take you from the airport to the car rental lot.
See more tips

Prefer to fly direct from Washington Dulles Airport to Seattle?

Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to Seattle/Tacoma Intl

Monday

Air Tahiti Nui, Alaska Airlines, Avianca, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

Tuesday

Alaska Airlines, Austrian Airlines, Avianca, +12 more

Alaska Airlines, Austrian Airlines, +13 more

Wednesday

Air Tahiti Nui, Alaska Airlines, Avianca, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

Thursday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

Friday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +13 more

Air Tahiti Nui, Alaska Airlines, +14 more

Saturday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +13 more

Air Tahiti Nui, Alaska Airlines, +14 more

Sunday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +12 more

Air Tahiti Nui, Alaska Airlines, +13 more

See more direct flights

Direct returns

Seattle/Tacoma Intl to Washington, D.C. Dulles Intl

Monday

Air Tahiti Nui, Alaska Airlines, Avianca, +13 more

Air Tahiti Nui, Alaska Airlines, +14 more

Tuesday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +14 more

Air Tahiti Nui, Alaska Airlines, +15 more

Wednesday

Air Tahiti Nui, Alaska Airlines, Brussels Airlines, +10 more

Air Tahiti Nui, Alaska Airlines, +11 more

Thursday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +15 more

Air Tahiti Nui, Alaska Airlines, +16 more

Friday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +13 more

Air Tahiti Nui, Alaska Airlines, +14 more

Saturday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +15 more

Air Tahiti Nui, Alaska Airlines, +16 more

Sunday

Air Tahiti Nui, Alaska Airlines, Austrian Airlines, +15 more

Air Tahiti Nui, Alaska Airlines, +16 more

See more direct flights
See more direct flights

Top 5 airlines serving from Dulles Intl to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Dulles Intl to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9594 reviews
7.9Comfort
7.1Entertainment
8.2Boarding
8.5Crew
7.2Food
Airline reviews

I rated the food and entertainment as poor due to the fact the flights were short in duration and no food serves or entertainment provided.

10.0 ExcellentAnonymous, Dec 2024BOI - SEA
Read more Alaska Airlines reviews

I rated the food and entertainment as poor due to the fact the flights were short in duration and no food serves or entertainment provided.

It was awful. We experienced turbulence for nearly the whole flight. Then when I picked up my luggage, two of the wheels were torn off. Worst flight ever!!

I like the short flight to Seattle and San Francisco. The boarding was fairly easy and the flight was as to be expected. The in-flight entertainment could be improved with wifi options. Paying $8 and then losing internet access and being told that flight attendants didn't want to serve beverages and snacks on board was disappointing because they didn't want to move a cart up and down the aisle blaming it on air turbulence which wasn't a problem.

Not great. The flight was delayed, then when we were on the plane we spent over an hour taxiing before take off. We arrived very late and it took a long time for the luggage to arrive. I wish you all Happy Holidays though.

It was comfortable, the food was mediocre. Tasted like microwaved food.

My flight was delayed. But it was during holidays so you kind of expect things like that to happen. I am not a frequently flyer so I am OK with that. But none the less, once the flight started, it seemed to me like it went fast. 😊

The planes were clean! The crew was good The boarding in Seattle was not good because the accent of the woman and the low volume of the speaker made it impossible to hear.

The entire trip from Bellingham to Seattle and from Seattle to Boise, Idaho was very very good and timely

What has happened to your airline customer service? We have to pay extra for everything now, except water, coffee and pretzels. A 6 hour flight and pretzels are free? Baggage is fined/fee Pick a seat is fined/fee A better seat is for bed/fee A meal is fined/fee Baggage over 35 lbs is fined/fee **When did get shamed into being like Spirit or Frontier? I'm rather disappointed in you.

The flights were on time and catching the connecting flight was a breeze. Next time I won't carry such a heavy carry-on without wheels!!

Overall, it was okay. Seat was a little cramped. Would’ve liked more substantial snacks or opportunity to buy some.

Inexpensive, got an exit row aisle aeat with no middle passenger, bought a great breakfast sandwich, flight comfortable & arrived ahead of schedule.

Delta was great the entertainment was outdated. Screen was very small and didn’t work.

The seats are uncomfortable, feels like a small seat pad on plywood.

My husband is very tall and we generally fly Delta Comfort. We used our companion benefit, and our seats were coach and extremely uncomfortable........ horrid even

My seat had no padding, it was literally plywood with a plastic cover. I could not change seats on my 10 hour flight. My excitement for this trip helped me deal with the pain.

I notice that every time I fly delta or any American carrier, the staff seem tired, overworked, and not at the service level I’m accustomed to in Asia. They frequently crash into my arm when coming down the aisle. Food is shoved at my face with no greeting or verbal cue. The food portions seemed much smaller than usual and didn’t see much wine or beverage options. This is comfort plus? The plane was old and tired. The bathroom was dripping with mineral stains after a long lack of cleaning. The power socket did not work, although the USB output did. I really wonder why I’m flying Delta, I think it’s time to switch to ANA.

The flight was great. The crew were a little terse about the size of my bag. It fit fine.

Screen didn’t play movies, do I was pretty boated the entire flight.

It was very cold because the air conditioner was on high power, and my son got sick.

First class felt like economy, seats were horrible, food was horrible, staff inattentive

EVen warmer in the plane it think it was 24+ degrees

The flying experience was great. The flight was on time with no boarding issues during a peak travel period. The short cut baggage drop and process was not smooth and efficient at Dulles.

Fast checkin with the self serve terminal, good communication at the boarding gate.

Very friendly staff. The flight was on time. Need a bit heavy covers/blankets. It can get colder with a thin blanket.

The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.

This was a 5 hour flight with no entertainment and with a snack being provided (pretzels and fruit bar), which are both high in carbs and sugar. Nuts would have been a better choice.

Everything was perfect except the pad at the top of the seat back. It pushes my head forward in a very uncomfortable position and it is not removable.

Good plane, crew, and flight. Boarding was a bit chaotic. Bathrooms were unacceptable. United DESPERATELY needs a new terminal at IAD.

United Airlines changed my flight 5 hours before I arrived at the airport. This messed up my entire day that I arrived in Japan.

Very mediocre greeting as we boarded, and the lead flight attendant accent was almost unrecognizable. He joked around a lot, while trying to give the safety demonstration, but did not succeed. My wife’s row was completely missed for beverages and the lead flight attendant didn’t even know that our row was Main cabin and able to have beverages at no charge. We are platinum, 2,000,000 miles on American Airlines and this was not a stellar crew.

No overhead space so all carryons were checked. No internet.

Check bag location is full of rude employees who are unwilling to assist with issues after talking to AA on the phone and relaying messages. The boarding was good. While on the flight it got really hot. Asked flight attendant if there’s a way to drop the temp and make it more comfortable as we are flying from DC to Miami so flying from cold to hot weather. No changes made. Stayed hot and uncomfortable on the plane. When asked again about the AC being down the flight attendant said no the WiFi was down but not the AC. I mentioned it was still hot. No changes.

No food, no entertainment. But the flight was really short so maybe they had to skip drinks. I was able to board early ONLY because I am old and decrepit and they let me pre-board. I RESENT your dumping us into category 9 if we do not pay up. And when I paid for a seat I was STILL given 9. The pre-boarding helps. THIS flight was exceptionally smooth, please congratulate the pilots.

On time (actually a little early). Was a good and short flight!

Great - quick boarding and landed early with an available gate.

On time, smooth, luggage was out fast at the end of the flight. About perfect.

The main problem was delay. The plane was at the gate early and bags were loaded. However, there was no crew for the flight. They were inbound from LGA and had to land and make their way to our gate. It took more than 40 minutes. Then, once the crew arrived and boarded, one of the crew members had to deplane and then a replacement crew member had to be found. It took another 40 minutes or so to get the final crew member. In all, we took off about 2 hours later than our scheduled departure time. Once in the air, the flight was great. Smooth most of the way. The crew was professional and efficient.

Flight departed on time and arrived a bit early. Can’t go wrong with that! And makes a travel experience go so well

WiFi wasn’t working on the flight, several delays and gate changes, ended up taking off 3 hrs later

I had paid for a seat assignment at the time of reservation but when I checked in the night before it wasn’t there. Had to purchase another seat.

So unprofessional. They changed my connecting flight to a time that made it literally impossible to make the flight with no way to contact them or reject the changes. When I missed the flight as expected, there was no one to be found at their ticketing counter and the phone support put me on hold for an indefinite time. Since they didn't have another flight that day, all sun country air personell had left the airport (this was at 7pm) and my only options were to get a hotel for the night and come back the next afternoon to hopefully get rescheduled or buy a flight with another airline.

I purchased an aisle seat but was put in the middle seat surrounded by families with small sick children (3). That can happen anytime and I was prepared. The ticket agent questioned why I hadn’t paid for my luggage and had to explain that 2 pieces were included with my ticket. I hate that nickel and diming attitude. Please inform your staff better.

I know the airline has been open for 40 years and the flight crew looked just as old. The flight attendants were not friendly and rude. They should think of retiring this crew.

The crew was friendly, but I only got a drink, no food.

Flight was late, boarding was a mess, families separated so they could make extra profit.

Great! A delay in taking off but that’s it

Terrible boarding experience at sea tac. Displayed on time departure despite being about an hour behind in boarding time. Boarded a bus to go to the tarmac to then board onto the plane.

Hidden fees everywhere while we aware of the fees but it quickly added up to a premium airline. From 12+ dollars to pick your set to $55 dollars a checked bag. No counter at the Portland Airport until 2 hrs before the flight made it so we couldn't get anything to eat before the flight. Pre checking your bags wasn't working on-line or at the kiosk, so we had to pay extra 5 dollars per bag for counter checking. So after everything was said and done, we ended up paying an extra $200. Plane was nice and clean plane staff was nice and attentive.

Excellent. Except seat C2 starting to be worned down. Very uncomfortable.

Everything you need to know for your flight from Dulles Intl to Seattle

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