What is the cheapest airline that flies from Seattle/Tacoma Intl to Belgium?

Aer Lingus, Icelandair, and Turkish Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Belgium

What airlines fly to Belgium?

Lufthansa, Icelandair and United Airlines are the top three most popular airlines that fly to Belgium from Seattle according to our data. Lufthansa is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Belgium. Keep in mind that there are 6 different airlines that fly to Belgium on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Belgium?

Prices for flights from Seattle/Tacoma Intl Airport to Belgium are refreshed on a daily basis.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Belgium?

As of October 2026, there are 6 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Belgium.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Belgium?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Belgium.

What documentation or ID do you need to fly to Belgium?

The travel and health documents required for your trip to Belgium can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belgium. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$358 Cheap Flights from Seattle to Belgium in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Belgium

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:35 pm - 11:55 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

12h 20m1 stop Reykjavik Keflavik Intl

12:50 pm - 5:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

13h 10m1 stop Reykjavik Keflavik Intl

$580Icelandair

Mon, Nov 23 - Tue, Dec 8

2:35 pm - 11:55 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

12h 20m1 stop Reykjavik Keflavik Intl

12:50 pm - 5:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

13h 10m1 stop Reykjavik Keflavik Intl

$624Icelandair

Mon, Jan 11 - Tue, Jan 19

7:45 am - 6:40 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

25h 55m3 stops Toronto Pearson Intl Zurich Stockholm Arlanda

11:30 am - 12:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

33h 30m3 stops Oslo Gardermoen Stockholm Arlanda Frankfurt am Main

$675Multiple Airlines

Mon, Nov 23 - Tue, Dec 8

3:15 pm - 8:55 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

32h 40m2 stops Vancouver Intl London Heathrow

7:00 am - 2:15 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

16h 15m2 stops Frankfurt am Main Vancouver Intl

$698Air Canada

Sun, Apr 18 - Fri, May 7

6:50 pm - 5:25 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

13h 35m1 stop Munich Franz Josef Strauss

7:00 am - 2:15 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

16h 15m2 stops Frankfurt am Main Vancouver Intl

$707Lufthansa

Sun, Apr 18 - Fri, May 7

8:20 pm - 7:10 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

13h 50m1 stop London Heathrow

11:00 am - 6:25 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

16h 25m1 stop London Heathrow

$729British Airways

Mon, Apr 12 - Wed, Apr 21

6:50 pm - 11:00 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

19h 10m1 stop Munich Franz Josef Strauss

7:00 am - 12:20 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 20m1 stop Frankfurt am Main

$737Lufthansa

Sun, Apr 18 - Fri, May 7

3:15 pm - 8:00 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

19h 45m2 stops Vancouver Intl London Heathrow

7:00 am - 12:20 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 20m1 stop Frankfurt am Main

$738United Airlines

Sun, Apr 18 - Thu, Apr 22

6:45 pm - 7:45 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

16h 00m1 stop London Heathrow

9:15 pm - 11:25 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

23h 10m1 stop London Heathrow

$742British Airways

Tue, Feb 2 - Mon, Feb 8

3:15 pm - 8:00 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

19h 45m2 stops Vancouver Intl London Heathrow

7:00 am - 12:20 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 20m1 stop Frankfurt am Main

$747United Airlines

Sun, Apr 18 - Thu, Apr 22

Cheap last minute flights

Enter your travel dates to find the best prices.

2:35 pm - 11:55 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

12h 20m1 stop Reykjavik Keflavik Intl

12:50 pm - 5:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

13h 10m1 stop Reykjavik Keflavik Intl

$782Icelandair

Mon, Nov 2 - Thu, Dec 3

3:15 pm - 1:15 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

37h 00m2 stops Vancouver Intl London Heathrow

7:00 am - 2:37 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

16h 37m2 stops Frankfurt am Main Vancouver Intl

$838Air Canada

Tue, Nov 3 - Wed, Nov 11

8:30 am - 1:15 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

19h 45m2 stops Denver Intl London Heathrow

7:00 am - 12:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 00m1 stop Frankfurt am Main

$842United Airlines

Tue, Nov 3 - Wed, Nov 11

7:05 pm - 1:15 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

57h 10m2 stops Vancouver Intl London Heathrow

10:00 am - 9:27 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

32h 27m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$845Air Canada

Mon, Nov 2 - Fri, Nov 27

11:45 am - 11:00 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

14h 15m1 stop Atlanta Hartsfield-Jackson

8:05 am - 11:47 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

12h 42m1 stop Amsterdam Schiphol

$848KLM

Tue, Nov 3 - Wed, Nov 11

10:56 pm - 1:15 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

29h 19m2 stops Chicago O'Hare Intl London Heathrow

7:00 am - 12:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 00m1 stop Frankfurt am Main

$852United Airlines

Mon, Nov 2 - Thu, Dec 3

11:10 pm - 7:35 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

23h 25m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol

10:45 am - 11:50 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

34h 05m1 stop Amsterdam Schiphol

$865Delta

Mon, Nov 2 - Wed, Dec 2

11:10 pm - 10:10 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

26h 00m2 stops Detroit Metropolitan Wayne County Amsterdam Schiphol

10:45 am - 11:50 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

34h 05m1 stop Amsterdam Schiphol

$865Delta

Sun, Nov 1 - Wed, Dec 2

2:35 pm - 11:55 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

12h 20m1 stop Reykjavik Keflavik Intl

12:50 pm - 5:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

13h 10m1 stop Reykjavik Keflavik Intl

$903Icelandair

Mon, Nov 2 - Tue, Dec 1

7:22 am - 7:35 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

16h 13m2 stops Atlanta Hartsfield-Jackson Amsterdam Schiphol

6:15 am - 11:50 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 35m1 stop Amsterdam Schiphol

$1,160KLM

Thu, Oct 29 - Tue, Dec 1

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Icelandair flights from Seattle to Belgium

Our best Icelandair deals on Seattle to Belgium flight tickets

Icelandair

Jan 11

SEA2:35 pmSeattle/Tacoma Intl

12h 20m

1 stop

BRU11:55 amBrussels Bruxelles-National

Jan 19

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$624

Icelandair

Nov 23

SEA2:35 pmSeattle/Tacoma Intl

12h 20m

1 stop

BRU11:55 amBrussels Bruxelles-National

Dec 8

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$629

Icelandair

Nov 23

SEA2:35 pmSeattle/Tacoma Intl

12h 20m

1 stop

BRU11:55 amBrussels Bruxelles-National

Dec 8

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$630

Air Canada flights from Seattle to Belgium

Our best Air Canada deals on Seattle to Belgium flight tickets

Air Canada

Apr 18

SEA3:15 pmSeattle/Tacoma Intl

32h 40m

2 stops

BRU8:55 amBrussels Bruxelles-National

Apr 22

BRU9:30 amBrussels Bruxelles-National

21h 28m

2 stops

SEA9:58 pmSeattle/Tacoma Intl

$739

Air Canada

Apr 18

SEA3:15 pmSeattle/Tacoma Intl

32h 40m

2 stops

BRU8:55 amBrussels Bruxelles-National

Apr 22

BRU9:30 amBrussels Bruxelles-National

21h 28m

2 stops

SEA9:58 pmSeattle/Tacoma Intl

$745

Air Canada

Apr 5

SEA7:05 pmSeattle/Tacoma Intl

39h 55m

2 stops

BRU8:00 pmBrussels Bruxelles-National

Apr 12

BRU9:20 pmBrussels Bruxelles-National

33h 38m

2 stops

SEA9:58 pmSeattle/Tacoma Intl

$753

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 11/23

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Tue 12/8

12:50 pm-5:00 pm

1 stop13h 10m

$580

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 1/11

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Tue 1/19

12:50 pm-5:00 pm

1 stop13h 10m

$624

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 11/23

7:45 am-6:40 pm

3 stops25h 55m

Brussels Bruxelles-National

Tue 12/8

11:30 am-12:00 pm

3 stops33h 30m

$675

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Sun 4/18

3:15 pm-8:55 am

2 stops32h 40m

Brussels Bruxelles-National

Fri 5/7

7:00 am-2:15 pm

2 stops16h 15m

$698

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Sun 4/18

6:50 pm-5:25 pm

1 stop13h 35m

Brussels Bruxelles-National

Fri 5/7

7:00 am-2:15 pm

2 stops16h 15m

$707

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 4/12

8:20 pm-7:10 pm

1 stop13h 50m

Brussels Bruxelles-National

Wed 4/21

11:00 am-6:25 pm

1 stop16h 25m

$729

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Sun 4/18

6:50 pm-11:00 pm

1 stop19h 10m

Brussels Bruxelles-National

Fri 5/7

7:00 am-12:20 pm

1 stop14h 20m

$737

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Sun 4/18

3:15 pm-8:00 pm

2 stops19h 45m

Brussels Bruxelles-National

Thu 4/22

7:00 am-12:20 pm

1 stop14h 20m

$738

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Tue 2/2

6:45 pm-7:45 pm

1 stop16h 00m

Brussels Bruxelles-National

Mon 2/8

9:15 pm-11:25 am

1 stop23h 10m

$742

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Sun 4/18

3:15 pm-8:00 pm

2 stops19h 45m

Brussels Bruxelles-National

Thu 4/22

7:00 am-12:20 pm

1 stop14h 20m

$747

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Belgium

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Belgium?

In general, February is the cheapest month to fly from Seattle to Belgium. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $510. If you are unable to visit Belgium during the month of February, then departing from Seattle during the month January is also very affordable. Most momondo users find prices during this month for around $522.

How far in advance should I book a flight from Seattle to Belgium?

You are more likely to see cheaper flights to Belgium from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Belgium for around $772 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Belgium from Seattle for as low as $562 on momondo.

Can stopping save me money on Seattle to Belgium flights?

You could potentially save up to 3% on your flight if you consider stops on a Seattle to Belgium flight.

Cheap Seattle to Belgium flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Belgium

Best Price Found	$358
Fastest flight time	12h 20m
Direct flights	None

The best one-way flight to Belgium from Seattle in the past 72 hours is $358. The best round-trip flight deal from Seattle to Belgium found on momondo in the last 72 hours is $580.

The fastest flight from Seattle to Belgium takes 12h 20m

There are no direct flights from Seattle to Belgium. There are no popular flight routes from Seattle to Belgium.

Search flight deals

Frequently asked questions about flying from Seattle to Belgium

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Belgium?
Prices for flights from Seattle/Tacoma Intl Airport to Belgium are refreshed on a daily basis.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Belgium?
As of October 2026, there are 6 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Belgium.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Belgium?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Belgium.
What documentation or ID do you need to fly to Belgium?
The travel and health documents required for your trip to Belgium can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belgium. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Seattle to Belgium

Compare and see reviews for airlines that fly from Seattle to Belgium with momondo

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $393	Free Cancellation	Rating 7.0 766 reviews	Search Icelandair flights
British Airways	PriceFrom $421	Free Cancellation	Rating 6.7 8,274 reviews	Search British Airways flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,597 reviews	Search KLM flights
Lufthansa	PriceFrom $496	Free Cancellation	Rating 6.8 8,294 reviews	Search Lufthansa flights
Delta	PriceFrom $509	Free Cancellation	Rating 7.8 8,682 reviews	Search Delta flights
United Airlines	PriceFrom $522	Free Cancellation	Rating 7.3 10,443 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Belgium?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Belgium for you.

Can I find flights from Seattle to Belgium with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Belgium from Seattle with this policy.

How can momondo help me find flights from Seattle to Belgium?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Belgium.

I’m not ready to book a flight from Seattle to Belgium right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Belgium from Seattle. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Belgium trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Complete your trip

Feeling lucky

Popular cities in Belgium

Flights to Brusselsfrom $499

Flights to Brusselsfrom $518

Cheap flights from Seattle to Belgium from $358

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Belgium departing on 12/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Seattle to Belgium

Cheap round-trip flights

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Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

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Icelandair flights from Seattle to Belgium

Our best Icelandair deals on Seattle to Belgium flight tickets

Air Canada flights from Seattle to Belgium

Our best Air Canada deals on Seattle to Belgium flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Belgium that are best for you.

See travel insights to Belgium from

How to get the cheapest flight ticket from Seattle to Belgium

What is the cheapest month to fly to Belgium?

How far in advance should I book a flight from Seattle to Belgium?

Can stopping save me money on Seattle to Belgium flights?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Belgium?

What airlines fly to Belgium?

Cheap Seattle to Belgium flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Belgium

Best airlines flying from Seattle to Belgium

Compare and see reviews for airlines that fly from Seattle to Belgium with momondo

Why use momondo?

An easier way to manage your Belgium trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Belgium

Popular cities in Belgium

Popular flights according to clicks in the last 7 days on momondo

Seattle flight routes

According to popular flight searches on momondo this year

Belgium flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Belgium

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Belgium

List of cabin classes available on flights landing in Belgium. Availability may vary depending on flight origin and airline.

Complete your trip to Belgium

Explore popular destinations other users love

According to popular flight searches on momondo this year