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$320+ Cheap flights from Seattle (SEA) to Brussels

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
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 Seattle/Tacoma Intl to Brussels are usually found in October or September, booked 64 days in advance, depart on a Tuesday or Monday and return on a Sunday

Find flight deals from Seattle to Brussels

Cheapest flights from Seattle to Brussels
Explore the most affordable flight options available from Seattle to Brussels. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/132:35 pmSEA - BRU
1 stop12h 20mIcelandair
Thu 11/2712:50 pmBRU - SEA
1 stop13h 10mIcelandair
Deal found 10/28$388
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/132:35 pmSEA - BRU
2 stops18h 20mMultiple Airlines
Thu 11/279:25 amBRU - SEA
2 stops16h 35mMultiple Airlines
Deal found 10/28$472
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/105:50 amSEA - BRU
2 stops17h 00mMultiple Airlines
Wed 12/176:45 amBRU - SEA
1 stop15h 35mMultiple Airlines
Deal found 10/28$474
This Air Canada deal was found by Cheapflights users on 10/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/253:40 pmSEA - BRU
2 stops19h 20mMultiple Airlines
Wed 2/2510:00 amBRU - SEA
2 stops18h 16mMultiple Airlines
Deal found 10/27$489
This Mytrip deal was found by Cheapflights users on 10/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/253:40 pmSEA - BRU
2 stops32h 15mMultiple Airlines
Tue 12/21:50 pmBRU - SEA
1 stop32h 30mMultiple Airlines
Deal found 10/27$492
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Tue 11/258:00 amSEA - BRU
1 stop14h 15mUnited Airlines
Wed 2/256:45 amBRU - SEA
1 stop15h 35mUnited Airlines
Deal found 10/27$506
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Mon 12/15:05 amSEA - BRU
2 stops23h 10mUnited Airlines
Thu 1/84:55 pmBRU - SEA
2 stops32h 06mUnited Airlines
Deal found 10/27$523
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Sun 11/308:10 amSEA - BRU
2 stops20h 05mUnited Airlines
Thu 1/84:55 pmBRU - SEA
2 stops32h 06mUnited Airlines
Deal found 10/27$525
This Air Canada deal was found by Cheapflights users on 10/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/298:00 pmSEA - BRU
2 stops51h 55mAir Canada
Wed 1/710:00 amBRU - SEA
2 stops45h 16mAir Canada
Deal found 10/27$526
This Mytrip deal was found by Cheapflights users on 10/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/252:00 pmSEA - BRU
1 stop14h 35mLufthansa
Tue 12/21:50 pmBRU - SEA
1 stop32h 30mLufthansa
Deal found 10/27$528
This Mytrip deal was found by Cheapflights users on 10/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/242:00 pmSEA - CRL
2 stops21h 20mMultiple Airlines
Mon 12/11:30 pmCRL - SEA
2 stops31h 40mMultiple Airlines
Deal found 10/26$945
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/102:35 pmSEA - CRL
2 stops21h 20mMultiple Airlines
Wed 12/177:00 amCRL - SEA
3 stops40h 20mMultiple Airlines
Deal found 10/28$1,058

Cheap flight deals from Seattle to Brussels

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Brussels (BR1). 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 October 29, 2025.

Round-trip from

$382
(CrystalTravel)

One-way from

$320
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$517
From Seattle/Tacoma Intl to Brussels
Search Deals
One-way flight from Seattle/Tacoma Intl to Brussels
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($105 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Brussels 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 October 29, 2025.
Use the filters below to find and compare flights from Seattle to Brussels that are best for you.

Fly from

Seattle

Fly to

Brussels

Route

Depart

Return

Price

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 4/23

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

Thu 5/7

1:50 pm-8:45 pm

1 stop15h 55m

$423

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

9:25 am-1:15 pm

2 stops18h 50m

Brussels Bruxelles-National

Tue 3/10

10:00 am-4:14 pm

3 stops38h 14m

$481

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 4/25

8:00 pm-8:50 am

2 stops51h 50m

Brussels Bruxelles-National

Tue 5/5

10:00 am-2:16 pm

2 stops37h 16m

$489

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 4/22

3:40 pm-8:00 pm

2 stops19h 20m

Brussels Bruxelles-National

Fri 5/8

10:00 am-7:41 pm

1 stop18h 41m

$489

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 4/22

3:40 pm-8:00 pm

2 stops19h 20m

Brussels Bruxelles-National

Wed 5/6

10:00 am-7:41 pm

1 stop18h 41m

$489

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 4/22

3:40 pm-8:00 pm

2 stops19h 20m

Brussels Bruxelles-National

Tue 5/5

10:00 am-7:41 pm

1 stop18h 41m

$489

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 4/22

3:40 pm-8:00 pm

2 stops19h 20m

Brussels Bruxelles-National

Thu 5/7

10:00 am-7:41 pm

1 stop18h 41m

$489

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 4/25

2:15 pm-9:00 am

1 stop33h 45m

Brussels Bruxelles-National

Tue 5/5

9:40 am-11:15 am

1 stop34h 35m

$492

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 4/1

12:46 pm-1:15 pm

2 stops15h 29m

Brussels Bruxelles-National

Wed 4/8

10:00 am-9:33 am

2 stops32h 33m

$494

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 4/27

8:00 am-7:15 am

1 stop14h 15m

Brussels Bruxelles-National

Wed 5/6

10:00 am-7:41 pm

1 stop18h 41m

$497

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 35 results
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Best time to book a flight from Seattle to Brussels

Have a flexible travel schedule? Discover the best time to fly to Brussels from Seattle 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 Seattle to Brussels

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Brussels. Price data was last updated on October 24, 2025.

The price you pay for your flight from Seattle to Brussels may vary depending on when you book. For the best chance of a lower fare, look to book 64 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Brussels (average of $380). Flying from Seattle to Brussels in July is currently the most expensive (average of $508). 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.

What is the cheapest time of day to fly from SEA to BRU?

Find hourly flight availability from Seattle to Brussels. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 29, 2025.

It’s optimal to fly from Seattle to Brussels in the morning. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from Seattle to Brussels?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Brussels. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Brussels flight should consider departing on Thursday at noon when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Brussels

Get insights into the airlines that provide service to Brussels. 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 Brussels. Reviews last updated October 29, 2025.
Get a feel of what it's like to fly with KLM, United Airlines, and Icelandair from Seattle to Brussels by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,406 reviews

Overall

7.7

Boarding

7.8

Comfort

7.7

Crew

8.4

Food

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,406 reviews
KLM
7.7
Good
1,406 reviews

Overall

7.7

Boarding

7.8

Comfort

7.7

Crew

8.4

Food

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
United Airlines
7.4
Good
8,999 reviews
KLM
7.7
Good
1,406 reviews

Overall

7.7

Boarding

7.8

Comfort

7.7

Crew

8.4

Food

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Icelandair
7.1
Good
562 reviews
KLM
7.7
Good
1,406 reviews

Overall

7.7

Boarding

7.8

Comfort

7.7

Crew

8.4

Food

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Lufthansa
6.8
Okay
7,541 reviews
KLM
7.7
Good
1,406 reviews

Overall

7.7

Boarding

7.8

Comfort

7.7

Crew

8.4

Food

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,485 reviews
KLM
7.7
Good
1,406 reviews

Overall

7.7

Boarding

7.8

Comfort

7.7

Crew

8.4

Food

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

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

  • What airport do you fly from for flights from Seattle to Brussels?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Brussels. On average, Seattle/Tacoma Intl has 0 outbound flights to Brussels per day from 11 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • How long is the flight from Seattle to Brussels?

    Icelandair and United Airlines can get you from Seattle to Brussels in just under 12h 05m. Your travel time can differ by up to 6h 45m. The distance between Seattle and Brussels is about 4941 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to Brussels round-trip?

    Icelandair, at $391, was found to be the cheapest airline from Seattle to Brussels.Alternate airlines to your destination round-trip include United Airlines and Virgin Atlantic. Users have found that Icelandair is 37% cheaper than the other options available to this destination.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Brussels 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 Seattle to Brussels?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Brussels (average of $380). Flying from Seattle to Brussels in July is currently the most expensive (average of $508). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Brussels

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Bruxelles-National flights
Portland to Bruxelles-National flights
Seattle to Charleroi Brussels flights
Portland to Antwerp flights
Portland to Charleroi Brussels flights

Top 10 airlines flying from Seattle to Brussels

Discover the top 10 airlines that operate flights from Seattle to Brussels. 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 October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$391Average$495FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$483Average$741FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$488Average$491FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$501Average$733FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$506Average$607FlexibilityNo cancel feeOn-time77%
KLMCheapest$511Average$686FlexibilityNo cancel feeOn-time75%
DeltaCheapest$514Average$733FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$532Average$556FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$556Average$740FlexibilityNo cancel feeOn-time67%
LufthansaCheapest$561Average$718FlexibilityNo cancel feeOn-time76%

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