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$527+ Cheap flights from Billund (BLL) to Seattle (SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
BLL — SEA
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Billund to Seattle/Tacoma Intl are usually found in January or December, booked 78 days in advance, depart on a Monday or Tuesday and return on a Friday

Cheap flight deals from Billund to Seattle

Cheapest flights from Billund to Seattle
Explore the most affordable flight options available from Billund to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 4, 2025.

This Delta deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amBLL - SEA
1 stop14h 50mDelta
Sat 6/67:30 amSEA - BLL
2 stops17h 05mDelta
Deal found 12/3$597
This KLM deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:30 pmBLL - SEA
1 stop30h 20mKLM
Sat 6/62:05 pmSEA - BLL
1 stop14h 35mKLM
Deal found 12/3$648
This United Airlines deal was found by Cheapflights users on 12/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:25 pmBLL - SEA
2 stops43h 34mUnited Airlines
Sat 6/67:10 pmSEA - BLL
3 stops38h 10mUnited Airlines
Deal found 12/3$701
This KLM deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:00 amBLL - SEA
1 stop14h 50mKLM
Wed 12/179:45 amSEA - BLL
2 stops16h 35mKLM
Deal found 12/4$1,058
This Flysmarter deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/141:15 pmBLL - SEA
2 stops19h 10mBritish Airways
Wed 12/179:00 amSEA - BLL
2 stops18h 10mBritish Airways
Deal found 12/4$1,182
This Flysmarter deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:00 amBLL - SEA
1 stop14h 50mMultiple Airlines
Wed 12/179:45 amSEA - BLL
2 stops16h 35mMultiple Airlines
Deal found 12/4$1,193
This Expedia deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:00 amBLL - SEA
1 stop14h 50mKLM
Wed 12/179:45 amSEA - BLL
2 stops16h 35mKLM
Deal found 12/4$1,195
This Delta deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:00 amBLL - SEA
2 stops20h 47mDelta
Wed 12/177:15 amSEA - BLL
2 stops21h 35mDelta
Deal found 12/4$1,197
This Delta deal was found by Cheapflights users on 12/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:00 amBLL - SEA
2 stops17h 59mDelta
Wed 12/177:20 amSEA - BLL
2 stops19h 00mDelta
Deal found 12/4$1,293

Find flight deals from Billund to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Billund (BLL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 4, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$489
(Ticket)

Popular in

July

Cheapest in

January

Average price

$555
Provider with most accurate pricing for Billund-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Billund-Seattle/Tacoma Intl flights.
Search Deals
From Billund to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($122 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Billund to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 4, 2025.
Use the filters below to find and compare flights from Billund to Seattle that are best for you.

Fly from

Billund

Fly to

Seattle

Route

Depart

Return

Price

BillundSeattle

BLL - SEA

BLLSEA

Billund

Thu 1/15

6:30 am-12:10 pm

1 stop14h 40m

Seattle/Tacoma Intl

Mon 1/19

2:00 pm-1:20 pm

1 stop14h 20m

$527

BillundSeattle

BLL - SEA

BLLSEA

Billund

Sat 1/31

6:45 am-9:12 pm

2 stops23h 27m

Seattle/Tacoma Intl

Wed 2/4

1:17 pm-1:20 pm

3 stops39h 03m

$532

BillundSeattle

BLL - SEA

BLLSEA

Billund

Wed 12/24

6:00 am-11:50 am

1 stop14h 50m

Seattle/Tacoma Intl

Sat 6/6

7:30 am-9:35 am

2 stops17h 05m

$597

BillundSeattle

BLL - SEA

BLLSEA

Billund

Wed 12/24

2:30 pm-11:50 am

1 stop30h 20m

Seattle/Tacoma Intl

Sat 6/6

2:05 pm-1:40 pm

1 stop14h 35m

$648

BillundSeattle

BLL - SEA

BLLSEA

Billund

Thu 1/15

6:30 am-7:16 pm

3 stops21h 46m

Seattle/Tacoma Intl

Mon 1/19

8:10 am-11:20 pm

2 stops30h 10m

$660

BillundSeattle

BLL - SEA

BLLSEA

Billund

Wed 12/24

2:25 pm-12:59 am

2 stops43h 34m

Seattle/Tacoma Intl

Sat 6/6

7:10 pm-6:20 pm

3 stops38h 10m

$701

BillundSeattle

BLL - SEA

BLLSEA

Billund

Mon 1/5

9:15 pm-7:50 pm

3 stops55h 35m

$807

BillundSeattle

BLL - SEA

BLLSEA

Billund

Tue 12/30

2:50 pm-6:20 pm

3 stops36h 30m

$923

BillundSeattle

BLL - SEA

BLLSEA

Billund

Sun 1/4

6:40 pm-1:10 pm

3 stops51h 30m

$959

BillundSeattle

BLL - SEA

BLLSEA

Billund

Wed 12/24

2:25 pm-3:40 pm

1 stop34h 15m

$968

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 14 results
1
2

Compare providers for flights from Billund to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Billund to Seattle in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Billund-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Billund-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Billund-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Billund-Seattle flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Billund-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Billund to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Billund with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

How far ahead should I book a flight from Billund to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Billund to Seattle. Price data was last updated on November 28, 2025.

To ensure you get the cheapest price possible for a flight from Billund to Seattle, you should look to book at least 78 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Billund to Seattle?

Currently, January is the cheapest month in which you can book a flight from Billund to Seattle (average of $421). Flying from Billund to Seattle in July is currently the most expensive (average of $597). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Billund to Seattle?

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated December 4, 2025.
Read through reviews of airlines operating flights from Billund to Seattle, such as Lufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Lufthansa
6.8
Okay
7,612 reviews

Food

6.3

Overall

6.8

Crew

7.6

Entertainment

6.4

Boarding

7.0

Comfort

6.8

Reviews

1 / 20
4.0
Okay

Djermouli,Dec 2025

FRA - SFO

I’m sorry the worst airline united food sales I’m diabetic plus high cholesterol pls seats it’s not comfortable plus screen tv broke I try to charge my phone don’t work I’m not flying with united airlines
Lufthansa
6.8
Okay
7,612 reviews
Lufthansa
6.8
Okay
7,612 reviews

Food

6.3

Overall

6.8

Crew

7.6

Entertainment

6.4

Boarding

7.0

Comfort

6.8

Reviews

1 / 20
4.0
Okay

Djermouli,Dec 2025

FRA - SFO

I’m sorry the worst airline united food sales I’m diabetic plus high cholesterol pls seats it’s not comfortable plus screen tv broke I try to charge my phone don’t work I’m not flying with united airlines

Related info for your journey

Find useful and relevant information for your journey from Billund to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Billund to Seattle?

    For as low as $489, British Airways can have you in Seattle from Billund in 12h 55m. The distance from Billund to Seattle is about 4771 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Billund to Seattle round-trip?

    Cheapflights users have booked flights from Billund to Seattle round-trip from $595. Lufthansa is priced at 9% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Billund to Seattle that include hotel bookings?

    Yes. In addition to deals on Billund to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Billund to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Billund to Seattle.

  • Can I find deals for business class flights from Billund to Seattle?

    Yes. Cheapflights offers flight deals from Billund to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Billund to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Billund to Seattle (average of $421). Flying from Billund to Seattle in July is currently the most expensive (average of $597). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Olympia
Ocean Shores
Edmonds
Lynnwood
Renton
Puyallup
Kirkland
Kent
Tukwila
Cle Elum
Marysville
Leavenworth
Fife
Aberdeen
Shoreline
Centralia
Federal Way

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Billund to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Billund to Seattle

Discover the top airline that operate flights from Billund to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$595Average$662FlexibilityNo cancel feeOn-time76%

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