Find flights
Deals
Insights
When to book
FAQs & Tips
Airlines

OPO - SEA

$545 Find Cheap Flights from Porto 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 Porto to Seattle departing on 3/27. 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.
1 adult
0 bags

Search hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to Seattle, as well as popular online travel agencies
In the last 7 days travelers have searched 46,646,933 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

World’s Best Airfare Search Site for 2024

Cheap Flight Deals from Porto to Seattle (OPO-SEA)

 
These are the cheapest deals for flights from Porto to Seattle currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. 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 Porto to Seattle

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Porto to Seattle.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
9:54 am - 10:50 amSEA-OPO
16h 56m2 stops
$748KLM
Find Deal
Sun, Jan 12 - Sat, Jan 18
12:15 pm - 11:50 amOPO-SEA
31h 35m1 stop
2:09 pm - 9:05 amSEA-OPO
34h 56m1 stop
$753KLM
Find Deal
Mon, Jan 13 - Sun, Jan 19
4:10 pm - 11:20 amOPO-SEA
27h 10m2 stops
9:54 am - 10:55 amSEA-OPO
17h 01m2 stops
$775
Find Deal
Mon, Jan 13 - Sun, Jan 19
1:45 pm - 1:20 pmOPO-SEA
31h 35m1 stop
11:05 am - 12:50 pmSEA-OPO
17h 45m2 stops
$799Lufthansa
Find Deal
Mon, Jan 13 - Sun, Jan 19
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
10:55 pm - 10:55 amSEA-OPO
28h 00m2 stops
$801Delta
Find Deal
Sun, Jan 12 - Sat, Jan 18
5:00 am - 10:25 pmOPO-SEA
25h 25m2 stops
10:55 pm - 10:55 amSEA-OPO
28h 00m2 stops
$807Delta
Find Deal
Sun, Jan 12 - Sat, Jan 18
6:00 pm - 5:00 pmOPO-SEA
31h 00m3 stops
2:35 pm - 11:40 pmSEA-OPO
25h 05m2 stops
$814
Find Deal
Sun, Jan 12 - Sat, Jan 18
12:30 pm - 12:10 pmOPO-SEA
31h 40m1 stop
7:00 am - 11:40 amSEA-OPO
44h 40m3 stops
$815United Airlines
Find Deal
Sun, Jan 12 - Fri, Jan 24
12:30 pm - 9:30 pmOPO-SEA
41h 00m2 stops
7:00 am - 11:40 amSEA-OPO
44h 40m3 stops
$838United Airlines
Find Deal
Sun, Jan 12 - Fri, Jan 24
12:30 pm - 12:10 pmOPO-SEA
31h 40m1 stop
2:00 pm - 10:25 pmSEA-OPO
24h 25m1 stop
$893Lufthansa
Find Deal
Sun, Jan 12 - Sat, Jan 18

Flights from Porto to Seattle - Travel Insights & Trends

Get data-powered insights and trends into flights from Porto 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 Porto to Seattle?

The average price of all flights from Porto to Seattle clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to Seattle on a Tuesday and more expensive on a Saturday. On your return trip to Porto, you should consider flying back on a Monday, and avoid Thursdays for better deals.

What is the cheapest month to fly from Porto to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Porto 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 Porto to Seattle is October, where tickets cost $332 on average. On the other hand, the most expensive months are June and January, where the average cost of tickets is $1,467 and $1,393 respectively.

Good to know

Low season

February

High season

March

Cheapest flight

$545
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from Porto to Seattle

When to book flights from Porto to Seattle

Are your dates flexible? Find out the best times to travel from Porto 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.

FAQs for booking flights from Porto to Seattle

  • What is the cheapest flight from Porto to Seattle?

    In the last 3 days, the lowest price for a flight from Porto to Seattle was $545 for a one-way ticket and $748 for a round-trip.

  • Do I need a passport to fly between Porto and Seattle?

    A passport is required to fly from Porto to Seattle.

  • Which aircraft models fly most regularly from Porto to Seattle?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Porto to Seattle?

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

  • How does KAYAK find such low prices on flights from Porto 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 Porto to Seattle.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Porto 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 Porto 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 Porto with another airline. Booking your flights between Porto 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 Porto 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 Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airline flying from Porto to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Porto 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 Porto 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.
7.8
KLMOverall score based on 1349 reviews
7.9Boarding
7.2Entertainment
7.7Comfort
7.3Food
8.4Crew
Airline reviews

I tried to upgrade to premium economy anis seat online during the checkin process. The payment didn’t work due to a technical glitch on KLM’s website. I wasn’t able to change my seat unless I called Amsterdam. Since I was in Canada and there’s a time difference this wasn’t practical. So when I arrived early to Ottawa airport my seat wasn’t available and I could only get a middle seat in premium economy which isn’t great. These middle seats are priced at the same rate as an aisle seat which makes no sense.

8.0 ExcellentShereen, Oct 2024YOW - CDG
Read more KLM reviews

I tried to upgrade to premium economy anis seat online during the checkin process. The payment didn’t work due to a technical glitch on KLM’s website. I wasn’t able to change my seat unless I called Amsterdam. Since I was in Canada and there’s a time difference this wasn’t practical. So when I arrived early to Ottawa airport my seat wasn’t available and I could only get a middle seat in premium economy which isn’t great. These middle seats are priced at the same rate as an aisle seat which makes no sense.

The food & entertainment really stood out in terms of quality. The nasi goreng & chicken satay were absolutely delicious. It’s great that KLM feature international cuisine.

Seats were comfortable crew members support was very good but AVML ordered or selected by us needs a lot of improvement.

Transavia flight, was booked as KLM but i couldnt select seat or access boarding pass with KLM at all. Crammed seating and very no frills experience all around. First and last time.

Transavia flight. Couldn't select seat or anything prior to flight. No connection with klm systems. Seats are very crammed. Extremely no frills.

Seats were nice and comfy. Crew was polite and attentive. Business class is awesome and worth the money.

Overall a very pleasant flight. No significant issues on either flight. Amsterdam airport is very convenient for connecting

It’s chaotic at the bus stop outside of the airport because of the Uber meeting point. You need to be alert and look for the KLM bus which is not branded or labeled. Incorrect information was provided to go to gate 28, when in fact the bus was at gate 27. On the plus side the bus left early and arrived early to Ottawa.

Great flight because I upgraded to Premium Comfort. Made a huge difference in the experience.

The baggage service at Malpensa was the worst ever. We wanted for over an hour without any information, they broke my suitcase, and the services of the local luggage services company was below any usual services level of a KLM partner.

Book cheap flights from Porto to Seattle

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Porto to Seattle found on KAYAK in the last 72 hours.
3/27Thu
3 stops
32h 10mOPO-SEA
$545
3/27Thu
2 stops
43h 28mOPO-SEA
$547
3/27Thu
1 stopTurkish Airlines
32h 40mOPO-SEA
$625
12/26Thu
2 stops
39h 00mOPO-SEA
$678
12/26Thu
1 stop
32h 00mOPO-SEA
$738
12/26Thu
3 stops
33h 00mOPO-SEA
$943
3/27Thu
2 stops
43h 28mOPO-SEA
$1,333
3/27Thu
3 stops
53h 35mOPO-SEA
$1,550
3/27Thu
1 stopTurkish Airlines
32h 40mOPO-SEA
$2,013

Search by stops

Search by airline

Search by price

Everything you need to know for your flight from Porto to Seattle

Information on your arrival and departure airports

Seattle (SEA)
Porto (OPO)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.