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$222+ 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 3/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
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 23, 2025.

This United Airlines deal was found by Cheapflights users on 12/22. 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 12/3110:52 amSEA - BRU
2 stops17h 23mUnited Airlines
Wed 1/79:40 amBRU - SEA
2 stops21h 36mUnited Airlines
Deal found 12/22$902
This British Airways deal was found by Cheapflights users on 12/22. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:50 pmSEA - BRU
1 stop12h 30mBritish Airways
Wed 1/78:30 pmBRU - SEA
2 stops31h 48mBritish Airways
Deal found 12/22$913
This Cheapflightsfares deal was found by Cheapflights users on 12/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:52 amSEA - BRU
1 stop13h 03mLufthansa
Wed 1/710:10 amBRU - SEA
1 stop17h 04mLufthansa
Deal found 12/21$932
This oojo deal was found by Cheapflights users on 12/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/228:05 pmSEA - BRU
1 stop28h 30mMultiple Airlines
Thu 1/158:35 pmBRU - SEA
2 stops34h 45mMultiple Airlines
Deal found 12/21$1,032
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Wed 12/247:05 amSEA - BRU
2 stops21h 10mUnited Airlines
Wed 12/3110:00 amBRU - SEA
2 stops32h 55mUnited Airlines
Deal found 12/21$1,089
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Wed 12/241:35 pmSEA - BRU
2 stops18h 55mUnited Airlines
Thu 1/111:55 amBRU - SEA
1 stop18h 02mUnited Airlines
Deal found 12/21$1,108
This Expedia deal was found by Cheapflights users on 12/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2510:57 amSEA - BRU
1 stop12h 58mMultiple Airlines
Wed 12/312:25 pmBRU - SEA
2 stops40h 51mMultiple Airlines
Deal found 12/21$1,163
This United Airlines deal was found by Cheapflights users on 12/22. 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 1/111:15 amBRU - SEA
2 stops33h 12mUnited Airlines
Deal found 12/22$1,164
This Mytrip deal was found by Cheapflights users on 12/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/222:00 pmSEA - CRL
2 stops19h 50mMultiple Airlines
Mon 12/2910:10 amCRL - SEA
2 stops35h 00mMultiple Airlines
Deal found 12/21$2,220

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 23, 2025.

Round-trip from

$412
(oojo)

One-way from

$222
(oojo)

Popular in

June

Cheapest in

October

Average price

$823
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. 2% 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 23, 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

8:40 am-1:15 pm

3 stops19h 35m

Brussels Bruxelles-National

Sun 1/25

10:00 am-8:57 pm

2 stops43h 57m

$485

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 2/5

8:40 am-1:15 pm

3 stops19h 35m

Brussels Bruxelles-National

Thu 2/12

10:00 am-8:56 pm

2 stops43h 56m

$485

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

$485

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

Wed 2/4

3:40 pm-8:55 am

2 stops32h 15m

Brussels Bruxelles-National

Wed 2/11

6:45 am-1:20 pm

1 stop15h 35m

$499

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 2/4

3:40 pm-8:55 am

2 stops32h 15m

Brussels Bruxelles-National

Sun 2/8

10:10 am-10:43 pm

1 stop21h 33m

$500

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 2/1

3:40 pm-8:55 am

2 stops32h 15m

Brussels Bruxelles-National

Sun 2/8

10:10 am-10:43 pm

1 stop21h 33m

$500

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 2/2

10:58 am-1:15 pm

2 stops17h 17m

Brussels Bruxelles-National

Sun 2/8

10:10 am-10:43 pm

1 stop21h 33m

$504

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Tue 5/12

3:40 pm-11:00 pm

2 stops22h 20m

Charleroi Brussels

Tue 5/26

6:55 am-3:40 pm

2 stops17h 45m

$906

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Sun 1/18

2:35 pm-10:15 pm

2 stops22h 40m

Charleroi Brussels

Sun 1/25

7:50 am-5:00 pm

2 stops18h 10m

$939

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

Showing 1-10 of 25 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 23, 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 23, 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
1,434 reviews

Crew

8.3

Food

7.2

Boarding

7.7

Entertainment

7.1

Overall

7.7

Comfort

7.6

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
1,434 reviews
KLM
7.7
Good
1,434 reviews

Crew

8.3

Food

7.2

Boarding

7.7

Entertainment

7.1

Overall

7.7

Comfort

7.6

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
9,103 reviews
KLM
7.7
Good
1,434 reviews

Crew

8.3

Food

7.2

Boarding

7.7

Entertainment

7.1

Overall

7.7

Comfort

7.6

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
592 reviews
KLM
7.7
Good
1,434 reviews

Crew

8.3

Food

7.2

Boarding

7.7

Entertainment

7.1

Overall

7.7

Comfort

7.6

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
7,649 reviews
KLM
7.7
Good
1,434 reviews

Crew

8.3

Food

7.2

Boarding

7.7

Entertainment

7.1

Overall

7.7

Comfort

7.6

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
7,605 reviews
KLM
7.7
Good
1,434 reviews

Crew

8.3

Food

7.2

Boarding

7.7

Entertainment

7.1

Overall

7.7

Comfort

7.6

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 19h 35m. United Airlines provides one of the quickest options available for as low as $485. 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 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$387Average$492FlexibilityNo cancel feeOn-time76%
DeltaCheapest$482Average$705FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$483Average$726FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$485Average$748FlexibilityNo cancel feeOn-time70%
Virgin AtlanticCheapest$488Average$491FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$501Average$703FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$506Average$581FlexibilityNo cancel feeOn-time77%
KLMCheapest$511Average$686FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$518Average$741FlexibilityNo cancel feeOn-time67%
Aer LingusCheapest$532Average$556FlexibilityNo cancel feeOn-timeN/A

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