HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Belgium

$356+ 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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Dec 10 — Dec 171
Wed 12/10
Wed 12/17
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Belgium with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 10, 2025.

Round-trip from

$414
(oojo)

One-way from

$356
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$572
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. 3% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 10, 2025.

This oojo deal was found by Cheapflights users on 11/8. 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.
Thu 12/112:35 pmSEA - BRU
1 stop12h 20mIcelandair
Wed 12/2412:50 pmBRU - SEA
1 stop13h 10mIcelandair
Deal found 11/8$414
This Air Canada deal was found by Cheapflights users on 11/8. 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 12/75:00 amSEA - BRU
2 stops17h 50mMultiple Airlines
Sun 12/1410:00 amBRU - SEA
2 stops21h 46mMultiple Airlines
Deal found 11/8$497
This United Airlines deal was found by Cheapflights users on 11/8. 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 12/610:40 amSEA - BRU
2 stops37h 15mUnited Airlines
Sat 12/137:00 amBRU - SEA
2 stops24h 16mUnited Airlines
Deal found 11/8$505
This Mytrip deal was found by Cheapflights users on 11/8. 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.
Thu 12/118:10 amSEA - BRU
2 stops20h 25mMultiple Airlines
Wed 12/246:45 amBRU - SEA
1 stop15h 35mMultiple Airlines
Deal found 11/8$507
This United Airlines deal was found by Cheapflights users on 11/8. 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 12/118:10 amSEA - BRU
2 stops24h 20mUnited Airlines
Wed 12/247:00 amBRU - SEA
2 stops24h 16mUnited Airlines
Deal found 11/8$529
This Kiwi.com deal was found by Cheapflights users on 11/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/303:10 pmSEA - BRU
1 stop16h 05mLufthansa
Sun 12/710:00 amBRU - SEA
2 stops18h 16mLufthansa
Deal found 11/9$592
This Mytrip deal was found by Cheapflights users on 11/8. 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 12/68:10 amSEA - BRU
2 stops20h 25mMultiple Airlines
Sat 12/137:00 amBRU - SEA
1 stop14h 10mMultiple Airlines
Deal found 11/8$599
This KLM deal was found by Cheapflights users on 11/8. 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.
Sun 12/77:20 amSEA - BRU
1 stop16h 40mKLM
Sun 12/142:45 pmBRU - SEA
1 stop30h 05mKLM
Deal found 11/8$606
This Gotogate deal was found by Cheapflights users on 11/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/3010:05 amSEA - BRU
2 stops36h 45mMultiple Airlines
Sun 12/710:00 amBRU - SEA
2 stops18h 16mMultiple Airlines
Deal found 11/9$627
This Mytrip deal was found by Cheapflights users on 11/8. 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 12/710:05 amSEA - CRL
3 stops27h 35mMultiple Airlines
Sun 12/1412:55 pmCRL - SEA
2 stops32h 15mMultiple Airlines
Deal found 11/8$817
This Mytrip deal was found by Cheapflights users on 11/8. 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 12/62:35 pmSEA - CRL
2 stops23h 20mMultiple Airlines
Sat 12/136:45 amCRL - SEA
2 stops19h 15mMultiple Airlines
Deal found 11/8$828
This Mytrip deal was found by Cheapflights users on 11/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/302:35 pmSEA - CRL
2 stops22h 40mMultiple Airlines
Sun 12/77:55 pmCRL - SEA
2 stops28h 45mMultiple Airlines
Deal found 11/9$974

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 10, 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

Thu 12/11

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Wed 12/24

12:50 pm-5:00 pm

1 stop13h 10m

$414

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 5/3

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

Sun 5/17

1:50 pm-8:45 pm

1 stop15h 55m

$445

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

3:40 pm-8:55 am

2 stops32h 15m

Brussels Bruxelles-National

Wed 4/1

7:00 am-10:08 pm

2 stops24h 08m

$494

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 12/7

8:00 pm-7:50 am

2 stops50h 50m

Brussels Bruxelles-National

Sun 12/14

9:30 am-12:10 pm

1 stop35h 40m

$504

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 3/23

6:00 am-8:00 am

1 stop18h 00m

Brussels Bruxelles-National

Mon 3/30

3:05 pm-3:50 pm

1 stop33h 45m

$506

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 12/11

8:10 am-1:35 pm

2 stops20h 25m

Brussels Bruxelles-National

Wed 12/24

6:45 am-1:20 pm

1 stop15h 35m

$507

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 3/21

3:55 pm-8:00 am

1 stop32h 05m

Brussels Bruxelles-National

Mon 3/30

3:05 pm-3:50 pm

1 stop33h 45m

$517

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 3/21

11:59 pm-7:50 am

2 stops23h 51m

Brussels Bruxelles-National

Mon 3/30

2:25 pm-12:20 pm

1 stop30h 55m

$523

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 12/11

8:10 am-5:30 pm

2 stops24h 20m

Brussels Bruxelles-National

Wed 12/24

7:00 am-10:16 pm

2 stops24h 16m

$529

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/9

Showing 1-10 of 30 results
1
2
3

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 10, 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 10, 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
1,410 reviews

Entertainment

7.1

Overall

7.7

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

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
1,410 reviews
KLM
7.7
Good
1,410 reviews

Entertainment

7.1

Overall

7.7

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

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
9,011 reviews
KLM
7.7
Good
1,410 reviews

Entertainment

7.1

Overall

7.7

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

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
574 reviews
KLM
7.7
Good
1,410 reviews

Entertainment

7.1

Overall

7.7

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

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
7,562 reviews
KLM
7.7
Good
1,410 reviews

Entertainment

7.1

Overall

7.7

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

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
7,508 reviews
KLM
7.7
Good
1,410 reviews

Entertainment

7.1

Overall

7.7

Comfort

7.7

Food

7.3

Boarding

7.8

Crew

8.4

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 12h 20m. Icelandair provides one of the quickest options available for as low as $414. 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 Lufthansa, with whom users have recently found tickets for as low as $356. However, be on the lookout for offers from KLM and Air Canada, 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.

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 Belgium

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Heathrow flights
Seattle to Charles de Gaulle flights
Seattle to Istanbul flights
Seattle to Gatwick flights
Seattle to Leonardo da Vinci/Fiumicino flights
Seattle to Dublin flights
Seattle to Frankfurt flights
Seattle to Amsterdam flights
Seattle to Orly flights
Portland to Heathrow flights
Seattle to Lisbon flights
Seattle to London City flights
Seattle to Stansted flights
Seattle to Athens flights
Seattle to Madrid flights
Seattle to Sabiha Gokcen flights
Seattle to Zurich flights
Seattle to Barcelona-El Prat flights
Seattle to Oslo Gardermoen flights
Portland to Amsterdam flights
Seattle to Malpensa flights
Seattle to Keflavik Intl flights
Seattle to Luton flights
Portland to Gatwick flights
Seattle to Munich flights
Portland to Charles de Gaulle flights
Portland to Leonardo da Vinci/Fiumicino flights
Seattle to Linate flights
Seattle to Copenhagen flights
Seattle to Vicenza flights
Portland to Dublin flights
Portland to Madrid flights
Seattle to Arlanda flights
Seattle to Bruxelles-National flights
Seattle to Frederic Chopin flights
Seattle to Edinburgh flights
Portland to Barcelona-El Prat flights
Portland to Orly flights
Seattle to Beauvais-Tille flights
Seattle to Geneva flights
Portland to Frankfurt flights
Seattle to Prague flights
Portland to London City flights
Portland to Lisbon flights
Seattle to Berlin flights
Portland to Stansted flights
Seattle to Porto flights
Portland to Athens flights
Seattle to Vienna flights
Seattle to Budapest flights

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 10, 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%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.