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$345+ 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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Dec 22 — Dec 291
Mon 12/22
Mon 12/29
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 November 22, 2025.

Round-trip from

$381
(CrystalTravel)

One-way from

$345
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$578
From Seattle/Tacoma Intl to Belgium
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One-way flight from Seattle/Tacoma Intl to Belgium
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Highest demand for flights based on searches. 4% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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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 November 22, 2025.

This Mytrip deal was found by Cheapflights users on 11/20. 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 12/28:00 pmSEA - BRU
2 stops26h 50mMultiple Airlines
Tue 12/97:00 amBRU - SEA
1 stop14h 10mMultiple Airlines
Deal found 11/20$579
This United Airlines deal was found by Cheapflights users on 11/20. 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 12/28:40 amSEA - BRU
2 stops19h 35mUnited Airlines
Tue 12/910:00 amBRU - SEA
2 stops39h 07mUnited Airlines
Deal found 11/20$580
This Scandinavian Airlines deal was found by Cheapflights users on 11/19. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/52:05 pmSEA - BRU
2 stops20h 45mScandinavian Airlines
Sun 12/78:30 pmBRU - SEA
2 stops31h 30mScandinavian Airlines
Deal found 11/19$597
This KLM deal was found by Cheapflights users on 11/20. 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.
Tue 12/23:05 pmSEA - BRU
1 stop14h 10mKLM
Tue 12/911:00 amBRU - SEA
1 stop18h 13mKLM
Deal found 11/20$612
This Gotogate deal was found by Cheapflights users on 11/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/48:00 pmSEA - BRU
2 stops26h 50mMultiple Airlines
Tue 12/234:25 pmBRU - SEA
1 stop29h 55mMultiple Airlines
Deal found 11/19$646
This Air Canada deal was found by Cheapflights users on 11/19. 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.
Thu 12/48:00 pmSEA - BRU
2 stops26h 50mAir Canada
Tue 12/2310:00 amBRU - SEA
2 stops45h 16mAir Canada
Deal found 11/19$649
This Booking.com deal was found by Cheapflights users on 11/19. 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.
Thu 12/42:00 pmSEA - BRU
1 stop21h 40mLufthansa
Tue 12/234:25 pmBRU - SEA
1 stop29h 55mLufthansa
Deal found 11/19$674
This KLM deal was found by Cheapflights users on 11/19. 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.
Fri 12/57:20 amSEA - BRU
1 stop16h 40mKLM
Sun 12/710:45 amBRU - SEA
1 stop34h 05mKLM
Deal found 11/19$707
This Gotogate deal was found by Cheapflights users on 11/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/510:05 amSEA - BRU
2 stops18h 05mMultiple Airlines
Sun 12/77:30 pmBRU - SEA
1 stop25h 40mMultiple Airlines
Deal found 11/19$710
This Kiwi.com deal was found by Cheapflights users on 11/21. 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.
Mon 11/247:00 amSEA - BRU
1 stop16h 55mLufthansa
Mon 12/17:30 pmBRU - SEA
1 stop25h 40mLufthansa
Deal found 11/21$720
This Air Canada deal was found by Cheapflights users on 11/21. 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.
Sun 11/238:00 pmSEA - BRU
2 stops26h 50mAir Canada
Tue 12/210:00 amBRU - SEA
2 stops21h 06mAir Canada
Deal found 11/21$742
This United Airlines deal was found by Cheapflights users on 11/21. 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 11/2312:00 pmSEA - BRU
2 stops16h 15mUnited Airlines
Tue 12/27:00 amBRU - SEA
1 stop14h 10mUnited Airlines
Deal found 11/21$748

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 November 22, 2025.
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

Sat 1/17

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Fri 1/23

10:30 am-12:10 pm

1 stop34h 40m

$473

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

8:40 am-1:15 pm

3 stops19h 35m

Brussels Bruxelles-National

Tue 3/10

10:00 am-11:49 am

2 stops33h 49m

$480

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 3/3

8:17 am-7:15 am

1 stop13h 58m

Brussels Bruxelles-National

Wed 4/1

8:30 am-12:20 pm

1 stop12h 50m

$492

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 2/14

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Sat 2/21

10:00 am-7:16 pm

2 stops18h 16m

$494

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 1/6

12:35 pm-1:15 pm

2 stops39h 40m

Brussels Bruxelles-National

Fri 1/23

10:00 am-10:43 pm

3 stops21h 43m

$503

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 1/5

1:35 pm-8:55 am

2 stops34h 20m

Brussels Bruxelles-National

Mon 1/12

7:00 am-10:16 pm

2 stops24h 16m

$505

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Sat 1/24

5:50 am-3:40 pm

3 stops24h 50m

Charleroi Brussels

Sat 1/31

9:40 pm-10:16 pm

2 stops33h 36m

$637

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Sat 2/14

8:10 am-9:40 pm

3 stops28h 30m

Charleroi Brussels

Sat 2/21

9:40 pm-10:16 pm

2 stops33h 36m

$826

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Sat 1/17

2:35 pm-10:15 pm

2 stops22h 40m

Charleroi Brussels

Fri 1/23

7:00 pm-12:10 pm

2 stops26h 10m

$970

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Fri 12/5

10:05 am-5:15 pm

3 stops22h 10m

Charleroi Brussels

Sun 12/7

7:55 pm-3:40 pm

2 stops28h 45m

$996

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 31 results
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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 $380). Flying from Seattle to Belgium in July is currently the most expensive (average of $509). 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 BE?

Find hourly flight availability from Seattle to Belgium. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 22, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 13% on flights from Seattle to Belgium by exploring options for tickets in the morning.

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

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

Travelers seeking maximum savings on their Seattle to Belgium 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 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 November 22, 2025.
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
1,419 reviews

Boarding

7.8

Comfort

7.6

Crew

8.4

Food

7.3

Overall

7.7

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
1,419 reviews
KLM
7.7
Good
1,419 reviews

Boarding

7.8

Comfort

7.6

Crew

8.4

Food

7.3

Overall

7.7

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
9,034 reviews
KLM
7.7
Good
1,419 reviews

Boarding

7.8

Comfort

7.6

Crew

8.4

Food

7.3

Overall

7.7

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
7.0
Good
581 reviews
KLM
7.7
Good
1,419 reviews

Boarding

7.8

Comfort

7.6

Crew

8.4

Food

7.3

Overall

7.7

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
7,579 reviews
KLM
7.7
Good
1,419 reviews

Boarding

7.8

Comfort

7.6

Crew

8.4

Food

7.3

Overall

7.7

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
7,534 reviews
KLM
7.7
Good
1,419 reviews

Boarding

7.8

Comfort

7.6

Crew

8.4

Food

7.3

Overall

7.7

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 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 16h 55m. Lufthansa provides one of the quickest options available for as low as $473. 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 Brussels Airlines, with whom users have recently found tickets for as low as $379. However, be on the lookout for offers from Icelandair and United Airlines, 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 $380). Flying from Seattle to Belgium in July is currently the most expensive (average of $509). 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.

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Top 10 airlines flying from Seattle to Belgium

Discover the top 10 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 November 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$386Average$493FlexibilityNo cancel feeOn-time76%
Virgin AtlanticCheapest$488Average$491FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$502Average$736FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$503Average$752FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$506Average$607FlexibilityNo cancel feeOn-time77%
KLMCheapest$511Average$681FlexibilityNo cancel feeOn-time75%
DeltaCheapest$514Average$739FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$532Average$556FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$556Average$740FlexibilityNo cancel feeOn-time67%
LufthansaCheapest$561Average$717FlexibilityNo cancel feeOn-time76%

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