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$323+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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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

Cheap 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 December 12, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:10 pmSEA - BRU
1 stop13h 00mLufthansa
Wed 1/710:00 amBRU - SEA
2 stops18h 16mLufthansa
Deal found 12/11$750
This Expedia deal was found by Cheapflights users on 12/9. 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.
Thu 12/258:10 amSEA - BRU
2 stops24h 20mMultiple Airlines
Thu 1/89:10 pmBRU - SEA
2 stops34h 06mMultiple Airlines
Deal found 12/9$799
This United Airlines deal was found by Cheapflights users on 12/10. 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.
Fri 12/125:00 amSEA - BRU
2 stops23h 15mUnited Airlines
Fri 12/199:35 amBRU - SEA
2 stops24h 24mUnited Airlines
Deal found 12/10$811
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Thu 12/2512:37 pmSEA - BRU
2 stops15h 38mUnited Airlines
Thu 1/81:50 pmBRU - SEA
1 stop32h 30mUnited Airlines
Deal found 12/9$843
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Sat 12/137:00 amSEA - BRU
1 stop16h 05mUnited Airlines
Sun 12/217:00 amBRU - SEA
2 stops24h 16mUnited Airlines
Deal found 12/11$859
This Booking.com deal was found by Cheapflights users on 12/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1210:40 amSEA - BRU
1 stop13h 15mMultiple Airlines
Fri 12/196:45 amBRU - SEA
1 stop15h 35mMultiple Airlines
Deal found 12/10$862
This Expedia deal was found by Cheapflights users on 12/9. 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.
Wed 12/248:00 pmSEA - BRU
2 stops26h 50mMultiple Airlines
Thu 1/89:10 pmBRU - SEA
2 stops34h 06mMultiple Airlines
Deal found 12/9$876
This Mytrip deal was found by Cheapflights users on 12/11. 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.
Sun 12/148:05 pmSEA - CRL
2 stops17h 10mMultiple Airlines
Sun 12/216:00 pmCRL - SEA
2 stops27h 10mMultiple Airlines
Deal found 12/11$1,829
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/122:00 pmSEA - CRL
2 stops32h 35mMultiple Airlines
Fri 12/191:00 pmCRL - SEA
1 stop14h 20mMultiple Airlines
Deal found 12/10$1,847
This Mytrip deal was found by Cheapflights users on 12/11. 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.
Sat 12/132:00 pmSEA - CRL
2 stops16h 50mMultiple Airlines
Sun 12/217:50 amCRL - SEA
2 stops19h 30mMultiple Airlines
Deal found 12/11$2,190
This Mytrip deal was found by Cheapflights users on 12/11. 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.
Sun 12/218:05 pmSEA - CRL
2 stops17h 10mMultiple Airlines
Sun 1/46:50 pmCRL - SEA
3 stops33h 26mMultiple Airlines
Deal found 12/11$2,596

Find 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 December 12, 2025.

Round-trip from

$381
(CrystalTravel)

One-way from

$323
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$790
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. 13% potential increase in price ($97 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($19 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 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 December 12, 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

Wed 2/11

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Thu 2/19

11:55 am-8:56 pm

1 stop18h 01m

$469

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 1/28

8:40 am-1:15 pm

3 stops19h 35m

Brussels Bruxelles-National

Sun 2/1

10:00 am-10:43 pm

2 stops45h 43m

$484

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 1/18

9:25 am-1:15 pm

2 stops18h 50m

Brussels Bruxelles-National

Thu 1/29

10:00 am-8:57 pm

2 stops43h 57m

$484

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/15

10:58 am-1:15 pm

2 stops17h 17m

Brussels Bruxelles-National

Thu 1/29

11:55 am-10:43 pm

2 stops19h 48m

$495

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Fri 1/23

10:58 am-1:15 pm

2 stops17h 17m

Brussels Bruxelles-National

Fri 1/30

10:00 am-10:43 pm

3 stops21h 43m

$507

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 1/24

7:00 am-1:15 pm

2 stops21h 15m

Brussels Bruxelles-National

Sat 1/31

9:40 am-7:16 pm

2 stops18h 36m

$512

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 2/14

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Fri 2/20

4:55 pm-10:16 pm

2 stops38h 21m

$522

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 4/7

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Thu 4/16

1:50 pm-8:40 pm

1 stop15h 50m

$530

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 4/26

3:40 pm-12:55 pm

1 stop12h 15m

Brussels Bruxelles-National

Wed 5/6

1:50 pm-8:40 pm

1 stop15h 50m

$535

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/8

7:00 am-8:05 am

1 stop16h 05m

Brussels Bruxelles-National

Thu 1/15

7:00 am-12:10 pm

1 stop14h 10m

$554

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

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 December 5, 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 $507). 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 December 12, 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.

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

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 December 12, 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
1,432 reviews

Comfort

7.6

Boarding

7.8

Food

7.2

Crew

8.3

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,432 reviews
KLM
7.7
Good
1,432 reviews

Comfort

7.6

Boarding

7.8

Food

7.2

Crew

8.3

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
United Airlines
7.4
Good
9,094 reviews
KLM
7.7
Good
1,432 reviews

Comfort

7.6

Boarding

7.8

Food

7.2

Crew

8.3

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Icelandair
7.0
Good
589 reviews
KLM
7.7
Good
1,432 reviews

Comfort

7.6

Boarding

7.8

Food

7.2

Crew

8.3

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Lufthansa
6.8
Okay
7,626 reviews
KLM
7.7
Good
1,432 reviews

Comfort

7.6

Boarding

7.8

Food

7.2

Crew

8.3

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
British Airways
6.7
Okay
7,571 reviews
KLM
7.7
Good
1,432 reviews

Comfort

7.6

Boarding

7.8

Food

7.2

Crew

8.3

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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?

    Brussels Airlines and United Airlines can get you from Seattle to Brussels in just under 16h 55m. Your travel time can differ by up to 2h 40m. 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 $387, was found to be the cheapest airline from Seattle to Brussels.Alternate airlines to your destination round-trip include Delta and United Airlines. Users have found that Icelandair is 38% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Brussels one-way?

    The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as $175. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Seattle to Brussels for a low price.

  • 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 $507). 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 Charleroi Brussels flights
Portland to Antwerp 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$387Average$492FlexibilityNo cancel feeOn-time76%
DeltaCheapest$482Average$714FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$483Average$734FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$488Average$491FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$501Average$705FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$506Average$581FlexibilityNo cancel feeOn-time77%
KLMCheapest$511Average$681FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$518Average$740FlexibilityNo cancel feeOn-time67%
British AirwaysCheapest$519Average$759FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$532Average$556FlexibilityNo cancel feeOn-timeN/A

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