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

Icelandair is the most popular carrier operating from Seattle/Tacoma Intl to Brussels

What airlines fly to Brussels?

Icelandair, Lufthansa and United Airlines are the top three most popular airlines that fly to Brussels from Seattle according to our data. Icelandair is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Brussels. Keep in mind that there are 6 different airlines that fly to Brussels 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 Brussels?

Prices for flights from Seattle/Tacoma Intl Airport to Brussels refresh daily.

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

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

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Brussels.

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

The travel and health documents required for your trip to Brussels 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 Brussels. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$226 Cheap Flights from Seattle to Brussels in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Brussels

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:00 pm - 12:55 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

32h 55m1 stop Reykjavik Keflavik Intl

1:50 pm - 8:40 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

15h 50m1 stop Reykjavik Keflavik Intl

$514Icelandair

Mon, Oct 5 - Sun, Oct 18

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

$516Icelandair

Mon, Feb 8 - Tue, Feb 16

6:50 pm - 9:15 pmSEA Seattle/Tacoma Intl-CRL Charleroi Brussels

17h 25m2 stops Munich Franz Josef Strauss Stockholm Arlanda

9:00 pm - 6:32 pmCRL Charleroi Brussels-SEA Seattle/Tacoma Intl

30h 32m3 stops Stockholm Arlanda Zurich Vancouver Intl

$554Multiple Airlines

Tue, Oct 13 - Tue, Oct 20

8:00 am - 9:15 pmSEA Seattle/Tacoma Intl-CRL Charleroi Brussels

28h 15m3 stops Toronto Pearson Intl Zurich Stockholm Arlanda

9:00 pm - 10:47 pmCRL Charleroi Brussels-SEA Seattle/Tacoma Intl

34h 47m3 stops Stockholm Arlanda Zurich Vancouver Intl

$558Multiple Airlines

Tue, Oct 13 - Tue, Oct 20

2:50 pm - 4:15 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

16h 25m1 stop Munich Franz Josef Strauss

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

14h 00m1 stop Frankfurt am Main

$721Lufthansa

Wed, Nov 11 - Wed, Nov 18

6:45 pm - 5:05 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

13h 20m1 stop London Heathrow

11:35 am - 4:50 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 15m1 stop London Heathrow

$721British Airways

Tue, Nov 10 - Fri, Nov 27

1:30 pm - 11:10 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

12h 40m1 stop London Heathrow

12:05 pm - 4:50 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

13h 45m1 stop London Heathrow

$721British Airways

Tue, Nov 17 - Tue, Dec 8

3:15 pm - 8:50 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

32h 35m2 stops Vancouver Intl London Heathrow

6:45 am - 1:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

15h 15m1 stop Munich Franz Josef Strauss

$725United Airlines

Tue, Dec 8 - Wed, Feb 17

12:45 pm - 1:15 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

15h 30m2 stops Denver Intl London Heathrow

11:55 am - 8:20 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

17h 25m1 stop Washington, D.C. Dulles Intl

$725United Airlines

Tue, Nov 17 - Tue, Dec 8

10:10 am - 7:55 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

24h 45m2 stops Vancouver Intl Munich Franz Josef Strauss

9:10 am - 1:00 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

12h 50m1 stop Munich Franz Josef Strauss

$727Lufthansa

Sun, Dec 6 - Wed, Feb 17

Cheap last minute flights

Enter your travel dates to find the best prices.

11:25 pm - 12:55 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

28h 30m1 stop Reykjavik Keflavik Intl

1:50 pm - 11:45 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

30h 55m1 stop Reykjavik Keflavik Intl

$539Icelandair

Tue, Sep 1 - Wed, Sep 9

7:00 pm - 12:55 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

32h 55m1 stop Reykjavik Keflavik Intl

1:50 pm - 11:45 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

30h 55m1 stop Reykjavik Keflavik Intl

$694Icelandair

Wed, Sep 2 - Wed, Sep 9

5:50 am - 7:10 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

16h 20m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

9:10 am - 10:05 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

33h 55m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$955Air Canada

Wed, Sep 2 - Wed, Sep 9

8:00 am - 7:50 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

14h 50m1 stop Toronto Pearson Intl

9:10 am - 10:05 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

33h 55m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$960Air Canada

Wed, Sep 2 - Wed, Sep 9

7:00 am - 9:00 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

17h 00m1 stop Chicago O'Hare Intl

6:20 am - 10:05 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

36h 45m2 stops Frankfurt am Main Vancouver Intl

$961United Airlines

Wed, Sep 2 - Wed, Sep 9

6:05 am - 9:40 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

18h 35m2 stops Minneapolis St Paul Amsterdam Schiphol

6:20 am - 4:35 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

19h 15m1 stop Amsterdam Schiphol

$970Delta

Wed, Sep 2 - Wed, Sep 9

7:38 am - 9:40 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

17h 02m2 stops Boston Logan Intl Amsterdam Schiphol

6:20 am - 11:47 amBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

14h 27m1 stop Amsterdam Schiphol

$970Delta

Tue, Sep 1 - Wed, Sep 9

7:00 am - 9:00 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

17h 00m1 stop Chicago O'Hare Intl

9:20 pm - 4:59 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

28h 39m1 stop Munich Franz Josef Strauss

$1,361Lufthansa

Thu, Sep 3 - Fri, Sep 4

7:00 am - 7:10 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

15h 10m2 stops Chicago O'Hare Intl Montreal Pierre Elliott Trudeau Intl

10:30 am - 7:07 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

17h 37m2 stops Frankfurt am Main Chicago O'Hare Intl

$3,064United Airlines

Thu, Sep 3 - Fri, Sep 4

8:10 am - 7:15 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

14h 05m1 stop Washington, D.C. Dulles Intl

7:30 pm - 10:43 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

36h 13m2 stops Frankfurt am Main Chicago O'Hare Intl

$3,138Lufthansa

Thu, Sep 3 - Fri, Sep 4

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United Airlines flights from Seattle to Brussels

Our best United Airlines deals on Seattle to Brussels flight tickets

United Airlines

Nov 3

SEA6:30 amSeattle/Tacoma Intl

21h 45m

2 stops

BRU1:15 pmBrussels Bruxelles-National

Nov 10

BRU10:10 amBrussels Bruxelles-National

22h 07m

1 stop

SEA11:17 pmSeattle/Tacoma Intl

$725

United Airlines

Dec 6

SEA6:50 amSeattle/Tacoma Intl

21h 25m

2 stops

BRU1:15 pmBrussels Bruxelles-National

Feb 18

BRU7:00 amBrussels Bruxelles-National

14h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$728

United Airlines

Dec 7

SEA7:00 amSeattle/Tacoma Intl

21h 15m

2 stops

BRU1:15 pmBrussels Bruxelles-National

Feb 19

BRU6:45 amBrussels Bruxelles-National

15h 15m

1 stop

SEA1:00 pmSeattle/Tacoma Intl

$729

Icelandair flights from Seattle to Brussels

Our best Icelandair deals on Seattle to Brussels flight tickets

Icelandair

Oct 5

SEA7:00 pmSeattle/Tacoma Intl

32h 55m

1 stop

BRU12:55 pmBrussels Bruxelles-National

Oct 18

BRU1:50 pmBrussels Bruxelles-National

15h 50m

1 stop

SEA8:40 pmSeattle/Tacoma Intl

$514

Icelandair

Feb 8

SEA2:35 pmSeattle/Tacoma Intl

12h 20m

1 stop

BRU11:55 amBrussels Bruxelles-National

Feb 16

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$516

Icelandair

Oct 22

SEA7:00 pmSeattle/Tacoma Intl

32h 55m

1 stop

BRU12:55 pmBrussels Bruxelles-National

Nov 5

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$517

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 10/5

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Sun 10/18

1:50 pm-8:40 pm

1 stop15h 50m

$514

Quickest round-trip

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 2/8

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Tue 2/16

12:50 pm-5:00 pm

1 stop13h 10m

$516

SeattleBrussels

SEA Seattle/Tacoma Intl - CRL Charleroi Brussels

SEACRL

Seattle/Tacoma Intl

Tue 10/13

6:50 pm-9:15 pm

2 stops17h 25m

Charleroi Brussels

Tue 10/20

9:00 pm-6:32 pm

3 stops30h 32m

$554

SeattleBrussels

SEA Seattle/Tacoma Intl - CRL Charleroi Brussels

SEACRL

Seattle/Tacoma Intl

Tue 10/13

8:00 am-9:15 pm

3 stops28h 15m

Charleroi Brussels

Tue 10/20

9:00 pm-10:47 pm

3 stops34h 47m

$558

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 11/11

2:50 pm-4:15 pm

1 stop16h 25m

Brussels Bruxelles-National

Wed 11/18

7:00 am-12:00 pm

1 stop14h 00m

$721

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Tue 11/10

6:45 pm-5:05 pm

1 stop13h 20m

Brussels Bruxelles-National

Fri 11/27

11:35 am-4:50 pm

1 stop14h 15m

$721

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Tue 11/17

1:30 pm-11:10 am

1 stop12h 40m

Brussels Bruxelles-National

Tue 12/8

12:05 pm-4:50 pm

1 stop13h 45m

$721

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Tue 12/8

3:15 pm-8:50 am

2 stops32h 35m

Brussels Bruxelles-National

Wed 2/17

6:45 am-1:00 pm

1 stop15h 15m

$725

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Tue 11/17

12:45 pm-1:15 pm

2 stops15h 30m

Brussels Bruxelles-National

Tue 12/8

11:55 am-8:20 pm

1 stop17h 25m

$725

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Sun 12/6

10:10 am-7:55 pm

2 stops24h 45m

Brussels Bruxelles-National

Wed 2/17

9:10 am-1:00 pm

1 stop12h 50m

$727

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 Brussels

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 typical price of a round-trip flight between Seattle and Brussels?

Prices are currently low for flights on this route.

Typical prices usually range from $639 to $847.
The lowest price recently found on this route was $514.

What is the cheapest month to fly to Brussels?

In general, January is the cheapest month to fly from Seattle to Brussels. 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 Brussels during the month of January, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around $556.

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

You are more likely to see cheaper flights to Brussels from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Brussels for around $725 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Brussels from Seattle for as low as $503 on momondo.

Cheap Seattle to Brussels flight deals and tips

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

Best Price Found	$226
Fastest flight time	12h 15m
Direct flights	None

The best one-way flight to Brussels from Seattle in the past 72 hours is $226. The best round-trip flight deal from Seattle to Brussels found on momondo in the last 72 hours is $514.

The fastest flight from Seattle to Brussels takes 12h 15m

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

Search flight deals

Frequently asked questions about flying from Seattle to Brussels

How far is Seattle/Tacoma Intl to Brussels by plane?
A flight from Seattle/Tacoma Intl to Brussels will travel around 4931.7 mi. 12h 15m is a normal flight duration for this route.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Brussels?
Prices for flights from Seattle/Tacoma Intl Airport to Brussels refresh daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Brussels?
As of August 2026, there are 6 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Brussels.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Brussels?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Brussels.
What documentation or ID do you need to fly to Brussels?
The travel and health documents required for your trip to Brussels 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 Brussels. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Seattle to Brussels

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

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $382	Free Cancellation	Rating 6.9 740 reviews	Search Icelandair flights
British Airways	PriceFrom $421	Free Cancellation	Rating 6.7 8,195 reviews	Search British Airways flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,567 reviews	Search KLM flights
Lufthansa	PriceFrom $494	Free Cancellation	Rating 6.8 8,227 reviews	Search Lufthansa flights
United Airlines	PriceFrom $502	Free Cancellation	Rating 7.4 10,138 reviews	Search United Airlines flights
Delta	PriceFrom $509	Free Cancellation	Rating 7.8 8,539 reviews	Search Delta flights

Why use momondo?

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

It is quick and easy to find Seattle to Brussels flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Brussels that suits you.

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

Yes. momondo allows you to filter the results for Seattle to Brussels flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between Seattle and Brussels by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are not ready to book a flight from Seattle to Brussels now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Brussels and let you know when they change.

An easier way to manage your Brussels 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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Nearby airports

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Other Belgium destinations

Other flights from Seattle

Complete your trip

Feeling lucky

Fly into one of these airports located in Brussels

Brussels Bruxelles-National Airport

Charleroi Brussels Airport

Cheap flights from Seattle to Brussels from $226

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 Brussels departing on 10/17. 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 Brussels

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

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United Airlines flights from Seattle to Brussels

Our best United Airlines deals on Seattle to Brussels flight tickets

Icelandair flights from Seattle to Brussels

Our best Icelandair deals on Seattle to Brussels flight tickets

momondo Fare Finder

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

See travel insights to Brussels from

How to get the cheapest flight ticket from Seattle to Brussels

What is the typical price of a round-trip flight between Seattle and Brussels?

What is the cheapest month to fly to Brussels?

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

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

What airlines fly to Brussels?

Cheap Seattle to Brussels flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Brussels

Best airlines flying from Seattle to Brussels

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

Why use momondo?

An easier way to manage your Brussels 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

Fly into one of these airports located in Brussels

Airports listed have a maximum distance of 27.4 mi from Brussels

Fly your favorite airline to Brussels

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

Popular cities in Belgium

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

Fly to other destinations from Seattle

According to popular flight searches on momondo this year

Complete your trip to Brussels

Explore popular destinations other users love

According to popular flight searches on momondo this year