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$233+ Cheap flights from Seattle (SEA) to Belgium

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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Feb 13 — Feb 201
Fri 2/13
Fri 2/20
1 adult, Economy
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Cheap flight deals from Seattle to Belgium

Keep the following information in mind while searching for Seattle to Belgium flight deals. Data was last updated January 14, 2026.

Round-trip from

$340
(Ticket)

One-way from

$233
(Finnair)

Popular in

December

Cheapest in

October

Average price

$516
From Seattle/Tacoma Intl to Belgium
Search Deals
One-way flight from Seattle/Tacoma Intl to Belgium
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from Seattle to Belgium

Cheapest flights from Seattle to Belgium
Explore the most affordable flight options available from Seattle to Belgium. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 14, 2026.

This Ticket deal was found by Cheapflights users on 1/13. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/292:35 pm
SEA
-
BRU
1 stop12h 20m
Icelandair
Thu 2/1212:50 pm
BRU
-
SEA
1 stop13h 10m
Icelandair
Deal found 1/13$340
This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/42:35 pm
SEA
-
BRU
1 stop12h 20m
Icelandair
Thu 2/1212:50 pm
BRU
-
SEA
1 stop13h 10m
Icelandair
Deal found 1/13$390
This oojo deal was found by Cheapflights users on 1/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/263:40 pm
SEA
-
BRU
1 stop12h 15m
Icelandair
Fri 5/81:50 pm
BRU
-
SEA
1 stop13h 05m
Icelandair
Deal found 1/12$399
This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:00 pm
SEA
-
BRU
1 stop32h 55m
Icelandair
Sun 5/101:50 pm
BRU
-
SEA
1 stop13h 05m
Icelandair
Deal found 1/13$406
This FlightHub deal was found by Cheapflights users on 1/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:00 pm
SEA
-
BRU
1 stop32h 55m
Icelandair
Sat 5/91:50 pm
BRU
-
SEA
1 stop13h 05m
Icelandair
Deal found 1/14$411
This United Airlines deal was found by Cheapflights users on 1/13. 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 2/1010:58 am
SEA
-
BRU
1 stop12h 57m
United Airlines
Tue 3/1010:00 am
BRU
-
SEA
2 stops41h 03m
United Airlines
Deal found 1/13$438
This oojo deal was found by Cheapflights users on 1/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/45:45 pm
SEA
-
BRU
2 stops16h 50m
British Airways
Thu 2/128:35 pm
BRU
-
SEA
1 stop23h 55m
British Airways
Deal found 1/13$439
This FlightHub deal was found by Cheapflights users on 1/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/63:40 pm
SEA
-
BRU
2 stops55h 10m
Multiple Airlines
Fri 3/2710:00 am
BRU
-
SEA
2 stops55h 33m
Multiple Airlines
Deal found 1/14$443
This Mytrip deal was found by Cheapflights users on 1/13. 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.
Fri 2/272:35 pm
SEA
-
CRL
2 stops18h 45m
Multiple Airlines
Fri 3/66:25 am
CRL
-
SEA
2 stops19h 35m
Multiple Airlines
Deal found 1/13$540
This Kiwi.com deal was found by Cheapflights users on 1/12. 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.
Sun 4/266:55 pm
SEA
-
CRL
1 stop14h 20m
Multiple Airlines
Fri 5/89:55 pm
CRL
-
SEA
2 stops31h 45m
Multiple Airlines
Deal found 1/12$862
This Mytrip deal was found by Cheapflights users on 1/14. 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.
Fri 2/62:35 pm
SEA
-
CRL
2 stops19h 40m
Multiple Airlines
Fri 3/276:20 am
CRL
-
SEA
2 stops22h 25m
Multiple Airlines
Deal found 1/14$891
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Sun 7/266:55 pm
SEA
-
CRL
1 stop14h 20m
Multiple Airlines
Mon 8/178:50 am
CRL
-
SEA
2 stops16h 10m
Multiple Airlines
Deal found 1/13$969

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Belgium 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 January 14, 2026.
Use the filters below to find and compare flights from Seattle to Belgium that are best for you.

Fly from

Seattle

Fly to

Belgium

Route

Depart

Return

Price

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Fri 5/1

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Sun 5/10

1:50 pm-8:40 pm

1 stop15h 50m

$407

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 3/7

11:47 pm-7:55 am

1 stop23h 08m

Brussels Bruxelles-National

Tue 3/17

10:00 am-8:56 pm

2 stops42h 56m

$438

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

10:58 am-8:55 am

1 stop12h 57m

Brussels Bruxelles-National

Tue 3/10

10:00 am-7:03 pm

2 stops41h 03m

$438

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 2/2

3:40 pm-7:50 am

2 stops55h 10m

Brussels Bruxelles-National

Fri 3/27

10:00 am-9:33 am

2 stops55h 33m

$450

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 5/16

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Tue 5/26

1:50 pm-5:55 pm

1 stop13h 05m

$450

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 4/26

10:10 am-7:10 am

2 stops36h 00m

Brussels Bruxelles-National

Fri 5/8

9:25 am-7:37 pm

1 stop19h 12m

$450

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 3/7

11:05 pm-8:00 am

1 stop23h 55m

Brussels Bruxelles-National

Tue 3/17

10:00 am-6:55 pm

1 stop16h 55m

$458

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 3/1

11:59 pm-8:55 am

1 stop23h 56m

Brussels Bruxelles-National

Sun 3/8

10:00 am-9:45 pm

2 stops44h 45m

$463

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Fri 2/27

2:35 pm-6:20 pm

2 stops18h 45m

Charleroi Brussels

Fri 3/6

6:25 am-5:00 pm

2 stops19h 35m

$540

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Sun 4/26

6:55 pm-6:15 pm

1 stop14h 20m

Charleroi Brussels

Fri 5/8

9:55 pm-8:40 pm

2 stops31h 45m

$862

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Showing 1-10 of 20 results
1
2

Best time to book a flight from Seattle to Belgium

Have a flexible travel schedule? Discover the best time to fly to Belgium 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 Belgium

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Belgium (average of $378). Flying from Seattle to Belgium in July is currently the most expensive (average of $505). 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.

Reviews of airlines servicing Belgium

Get insights into the airlines that provide service to Belgium. 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 Belgium. Reviews last updated January 14, 2026.
Peruse reviews from past customers who have flown with KLM, United Airlines, and Icelandair from Seattle to Belgium to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,437 reviews

Boarding

7.7

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
KLM
7.7
Good
1,437 reviews
KLM
7.7
Good
1,437 reviews

Boarding

7.7

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
United Airlines
7.4
Good
9,157 reviews
KLM
7.7
Good
1,437 reviews

Boarding

7.7

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Icelandair
7.1
Good
596 reviews
KLM
7.7
Good
1,437 reviews

Boarding

7.7

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Lufthansa
6.8
Okay
7,713 reviews
KLM
7.7
Good
1,437 reviews

Boarding

7.7

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
British Airways
6.7
Okay
7,672 reviews
KLM
7.7
Good
1,437 reviews

Boarding

7.7

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Belgium. 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 Belgium?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Belgium.

  • How long is the flight from Seattle to Belgium?

    A quick flight from Seattle to Belgium can take about 23h 08m. Icelandair provides one of the quickest options available for as low as $438. Airlines will cover a distance of 4941 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Seattle to Belgium 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 KLM, as they are both options that can get you from Seattle to Belgium for a low price.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Seattle to Belgium (average of $378). Flying from Seattle to Belgium in July is currently the most expensive (average of $505). 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

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See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Seattle to Belgium

Discover the top 9 airlines that operate flights from Seattle to Belgium. 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 January 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$385Average$487FlexibilityNo cancel feeOn-time76%
DeltaCheapest$482Average$688FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$483Average$730FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$485Average$729FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$488Average$491FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$494Average$701FlexibilityNo cancel feeOn-time76%
KLMCheapest$508Average$689FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$518Average$808FlexibilityNo cancel feeOn-time67%
Aer LingusCheapest$536Average$592FlexibilityNo cancel feeOn-timeN/A

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