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$353+ 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 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Jan 13 — Jan 201
Tue 1/13
Tue 1/20
1 adult, Economy
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Cheap 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 December 14, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/13. 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 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 12/13$750
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2412:35 pmSEA - BRU
2 stops39h 40mUnited Airlines
Tue 12/304:55 pmBRU - SEA
2 stops34h 51mUnited Airlines
Deal found 12/14$907
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2412:35 pmSEA - BRU
2 stops39h 40mUnited Airlines
Wed 12/3110:10 amBRU - SEA
1 stop34h 53mUnited Airlines
Deal found 12/14$1,075
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:05 amSEA - BRU
2 stops21h 10mUnited Airlines
Thu 1/111:55 amBRU - SEA
2 stops31h 01mUnited Airlines
Deal found 12/14$1,115
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/233:50 pmSEA - BRU
2 stops30h 25mUnited Airlines
Wed 12/3111:15 amBRU - SEA
2 stops31h 40mUnited Airlines
Deal found 12/14$1,125
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:45 amSEA - BRU
2 stops21h 25mUnited Airlines
Thu 1/111:55 amBRU - SEA
2 stops31h 01mUnited Airlines
Deal found 12/14$1,175
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/233:50 pmSEA - BRU
2 stops30h 25mUnited Airlines
Thu 1/111:55 amBRU - SEA
2 stops31h 01mUnited Airlines
Deal found 12/14$1,184

Find flight deals from Seattle to Belgium

Keep the following information in mind while searching for Seattle to Belgium flight deals. Data was last updated December 14, 2025.

Round-trip from

$385
(Booking.com)

One-way from

$353
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$790
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. 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 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 December 14, 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

Sun 1/18

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Thu 1/29

7:00 am-12:10 pm

1 stop14h 10m

$483

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 1/18

10:58 am-1:15 pm

2 stops17h 17m

Brussels Bruxelles-National

Thu 1/29

10:00 am-10:43 pm

3 stops45h 43m

$484

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 2/14

6:50 pm-8:50 pm

1 stop17h 00m

Brussels Bruxelles-National

Fri 2/20

3:00 pm-11:30 am

1 stop29h 30m

$485

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

10:58 am-1:15 pm

2 stops17h 17m

Brussels Bruxelles-National

Tue 3/10

10:00 am-11:49 am

2 stops33h 49m

$485

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 1/27

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Tue 2/3

10:00 am-4:01 pm

2 stops39h 01m

$488

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 1/28

10:58 am-8:55 am

1 stop12h 57m

Brussels Bruxelles-National

Sun 2/1

10:00 am-10:43 pm

2 stops45h 43m

$488

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 2/12

3:40 pm-7:50 am

2 stops31h 10m

Brussels Bruxelles-National

Sat 2/21

10:00 am-2:31 pm

2 stops37h 31m

$491

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

7:00 am-1:10 pm

2 stops21h 10m

Brussels Bruxelles-National

Tue 3/10

7:00 am-1:10 pm

1 stop14h 10m

$491

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 3/3

3:40 pm-8:00 pm

2 stops19h 20m

Brussels Bruxelles-National

Wed 4/1

9:25 am-9:51 pm

2 stops21h 26m

$499

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/15

12:25 pm-1:15 pm

2 stops15h 50m

Brussels Bruxelles-National

Thu 1/29

10:00 am-10:43 pm

3 stops21h 43m

$499

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 35 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 $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 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 December 14, 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 Tuesday mornings 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 December 14, 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
1,430 reviews

Comfort

7.6

Boarding

7.8

Crew

8.4

Food

7.2

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
1,430 reviews
KLM
7.7
Good
1,430 reviews

Comfort

7.6

Boarding

7.8

Crew

8.4

Food

7.2

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
9,092 reviews
KLM
7.7
Good
1,430 reviews

Comfort

7.6

Boarding

7.8

Crew

8.4

Food

7.2

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
590 reviews
KLM
7.7
Good
1,430 reviews

Comfort

7.6

Boarding

7.8

Crew

8.4

Food

7.2

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
7,628 reviews
KLM
7.7
Good
1,430 reviews

Comfort

7.6

Boarding

7.8

Crew

8.4

Food

7.2

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
7,574 reviews
KLM
7.7
Good
1,430 reviews

Comfort

7.6

Boarding

7.8

Crew

8.4

Food

7.2

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 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 12h 20m. Icelandair provides one of the quickest options available for as low as $385. Airlines will cover a distance of 4941 mi.

  • 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 $380). Flying from Seattle to Belgium 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

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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 December 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$387Average$492FlexibilityNo cancel feeOn-time76%
DeltaCheapest$482Average$714FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$486Average$753FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$488Average$491FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$501Average$709FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$502Average$736FlexibilityNo cancel feeOn-time69%
Air FranceCheapest$506Average$581FlexibilityNo cancel feeOn-time77%
KLMCheapest$511Average$681FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$518Average$808FlexibilityNo cancel feeOn-time67%
Aer LingusCheapest$532Average$556FlexibilityNo cancel feeOn-timeN/A

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