BLL - SEA

$507 Find Cheap Flights from Billund to Seattle

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Billund to Seattle departing on 3/20. 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
1 adult, Economy, 0 bags

KAYAK searches 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 Billund 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 Billund to Seattle, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$507
Overall average: $650
United Airlines
Fri 3/20Sun 3/29
BLL - SEA • 1 stop
Cheapest one-way
Multiple Airlines
Wed 1/14
BLL - SEA • multi-stop
Top airlines
United Airlines
Cheapest • from $507 (round-trip)
Lufthansa
Best reviews • 6.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 37% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
December
Cheapest • 21% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Billund to Seattle (BLL-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Billund 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Billund to Seattle

Fri, Mar 20 - Sun, Mar 29
United Airlines Logo
6:30 am - 1:10 pm
BLL
-
SEA
14h 40m
1 stop
United Airlines Logo
8:00 am - 6:00 pm
SEA
-
BLL
25h 00m
2 stops
$507United Airlines
Thu, Feb 12 - Thu, Feb 19
United Airlines Logo
2:00 pm - 11:51 pm
BLL
-
SEA
42h 51m
2 stops
United Airlines Logo
11:59 pm - 10:00 am
SEA
-
BLL
25h 01m
2 stops
$526United Airlines
Thu, Feb 12 - Thu, Feb 19
Multiple Airlines Logo
6:30 am - 12:10 pm
BLL
-
SEA
14h 40m
1 stop
Multiple Airlines Logo
5:45 am - 11:20 pm
SEA
-
BLL
32h 35m
2 stops
$529Multiple Airlines
Sun, Mar 22 - Sun, Mar 29
British Airways Logo
8:50 pm - 5:55 pm
BLL
-
SEA
29h 05m
1 stop
British Airways Logo
8:20 pm - 8:35 pm
SEA
-
BLL
15h 15m
1 stop
$585British Airways
Fri, Mar 20 - Sat, Mar 28
United Airlines Logo
6:30 am - 1:10 pm
BLL
-
SEA
14h 40m
1 stop
United Airlines Logo
11:59 pm - 2:10 pm
SEA
-
BLL
29h 11m
2 stops
$604United Airlines
Thu, Feb 12 - Thu, Feb 19
Air Canada Logo
10:35 am - 10:57 pm
BLL
-
SEA
21h 22m
3 stops
Air Canada Logo
5:45 am - 1:20 pm
SEA
-
BLL
22h 35m
2 stops
$614Air Canada
Sun, Mar 22 - Sun, Mar 29
British Airways Logo
8:50 pm - 5:55 pm
BLL
-
SEA
29h 05m
1 stop
British Airways Logo
1:37 pm - 9:50 am
SEA
-
BLL
35h 13m
2 stops
$635British Airways
Fri, Mar 20 - Sat, Mar 28
United Airlines Logo
6:30 am - 1:10 pm
BLL
-
SEA
14h 40m
1 stop
United Airlines Logo
3:00 pm - 1:10 pm
SEA
-
BLL
14h 10m
1 stop
$651United Airlines
Fri, Mar 20 - Mon, Mar 30
Air Canada Logo
6:30 am - 7:16 pm
BLL
-
SEA
20h 46m
2 stops
Air Canada Logo
10:10 am - 2:10 pm
SEA
-
BLL
19h 00m
2 stops
$709Air Canada
Fri, Mar 20 - Sun, Mar 29
British Airways Logo
12:55 pm - 5:55 pm
BLL
-
SEA
13h 00m
1 stop
British Airways Logo
8:20 pm - 9:50 am
SEA
-
BLL
28h 30m
1 stop
$736British Airways
Booking Insights

KAYAK's insights & trends for Billund to Seattle flights

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Billund 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 Billund to Seattle is December, where tickets cost $554 (return) on average. On the other hand, the most expensive months are July and January, where the average cost of round-trip tickets is $977 and $903 respectively.

How far in advance should I book a flight from Billund 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 Billund 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 Billund to Seattle, you should book around 3 weeks before departure, which saves you about 37% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonNovember
Cheapest flight$507
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly with an average 39% increase in price.
Flight from Billund to Seattle

When to book flights from Billund to Seattle

Are your dates flexible? Find out the best times to travel from Billund 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 Billund to Seattle

  • What is the cheapest flight from Billund to Seattle?

    In the last 3 days, the lowest price for a flight from Billund to Seattle was $507 for a round-trip ticket.

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

    Yes

  • Which airports will I be using when flying from Billund to Seattle?

    Billund airport is called Billund and the only airport in Seattle is Seattle/Tacoma Intl.

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

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

  • Which airline alliances offer flights from Billund to Seattle?

    Star Alliance is the only airline alliance operating flights between Billund and Seattle.

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

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

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

Reviews of the top airline flying from Billund to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Billund 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 Billund 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.
6.8
LufthansaOverall score based on 7711 reviews
7.0Boarding
6.4Entertainment
6.3Food
6.8Comfort
7.6Crew
Airline reviews

Some of the crew was sassy and not super helpful. The food was okay, but it seems like they were all unprepared compared to my flight I did from JFK to Frankfurt

6.0 GoodAnonymous, Jan 2026
FRA - JFK
Read more Lufthansa reviews

Some of the crew was sassy and not super helpful. The food was okay, but it seems like they were all unprepared compared to my flight I did from JFK to Frankfurt

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

We were in premium economy seats that appeared to be locked in plae, No reclining. My aching back.

I don’t understand how they charge as much as they do for such a poor experience

Lufthansa flight LH04414 from Munich to Washington DC, was fine. Efficient and safe!

I wish the plane had pod seating for business class. I had a window seat (8K) and I had to climb over the person sitting on the aisle when I needed to get up. Also there is no partition between the seats for privacy when sleeping. The Asian airlines have much nicer business class seating. Their seats are wider for better comfort when sleeping.

Bumpy ride, not Lufthansa‘s fault. Crew managed a situation over a back rest to far down well. It was two iles behind me. The person putting the seat down, against the other person’s knees, was quite rude and belligerent and needed to be told in a no nonsense matter to stopp. Male flight attendant did good job.

Patrick and the whole crew were amazing! Hope to have this team for all my European trips.

This review is based on 2 things: 1. The lack of hygiene on the plane. 2. William - the head flight attendant. The lack of cleanliness on the plane upon arrival was appalling. Being given a sanitizing wipe upon boarding of the plane is shocking when you consider the cost of a business class flight. UA expects me to do their job and clean all the bread, food and debris left from previous guests. Does this sound normal to you. The seat, the food table and the sides were full of crumbs, chocolate and dirt. When I told the flight attendant they just gave me more wipes so I could clean it myself. Secondly, William the business cabin head flight attendant was so busy flirting with a couple in the front that his attention to the other guests was minimal. He continuously asked them if they were ok or if they needed anything and it didn’t matter if the rest of us needed anything. And if you are the lead attendant shouldn’t you be checking if the bathrooms in business class are clean and needing toilet paper. There were 2 bathrooms in business. Halfway through the flight the first bathroom was closed and the second bathroom was dirty and had no toilet paper one hour and a half before the flight landed. He needs additional training on prioritizing things. He should care less about flirting and more about his work

Booked seats (paid extra) online and found they didn’t exist on the flight. We were then separated from the rest of our party. Given seats in the very back of the plane. We will not fly Discover or Lufthansa again. We will not book flights or travel through Kayak again!

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

Information on your arrival and departure airports