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

Icelandair is the most popular carrier 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 38% 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 September 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.

$239 Cheap Flights from Seattle to Belgium in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Belgium

Round-trip

One-way

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

$484Icelandair

Wed, Dec 2 - Sun, Dec 6

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

$484Icelandair

Wed, Nov 18 - Tue, Dec 1

6:45 pm - 8:10 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

16h 25m1 stop London Heathrow

12:00 pm - 4:50 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

13h 50m1 stop London Heathrow

$563British Airways

Wed, Nov 18 - Wed, Nov 25

8:09 am - 7:15 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

14h 06m1 stop Washington, D.C. Dulles Intl

11:55 am - 8:56 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

18h 01m1 stop Washington, D.C. Dulles Intl

$570Multiple Airlines

Wed, Nov 4 - Wed, Nov 11

6:45 pm - 4:20 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

12h 35m1 stop London Heathrow

7:00 am - 8:21 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

22h 21m2 stops Madrid Barajas Chicago O'Hare Intl

$571Multiple Airlines

Wed, Nov 18 - Wed, Nov 25

6:45 pm - 4:20 pmSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

12h 35m1 stop London Heathrow

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

23h 10m1 stop London Heathrow

$578British Airways

Wed, Nov 4 - Mon, Nov 9

8:00 am - 7:15 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

14h 15m1 stop Washington, D.C. Dulles Intl

11:15 am - 9:40 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

19h 25m1 stop Newark

$588United Airlines

Wed, Jan 20 - Wed, Jan 27

7:00 am - 8:55 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

16h 55m1 stop Chicago O'Hare Intl

11:55 am - 9:56 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

19h 01m2 stops Washington, D.C. Dulles Intl Los Angeles

$588United Airlines

Wed, Jan 20 - Wed, Jan 27

3:00 pm - 7:10 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

31h 10m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

9:10 am - 2:22 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

38h 12m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$614Lufthansa

Mon, Oct 5 - Thu, Oct 15

3:00 pm - 7:10 amSEA Seattle/Tacoma Intl-BRU Brussels Bruxelles-National

31h 10m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

4:25 pm - 4:59 pmBRU Brussels Bruxelles-National-SEA Seattle/Tacoma Intl

33h 34m1 stop Munich Franz Josef Strauss

$652Lufthansa

Mon, Oct 12 - Mon, Oct 19

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United Airlines flights from Seattle to Belgium

Our best United Airlines deals on Seattle to Belgium flight tickets

United Airlines

Jan 20

SEA8:00 amSeattle/Tacoma Intl

14h 15m

1 stop

BRU7:15 amBrussels Bruxelles-National

Jan 27

BRU11:15 amBrussels Bruxelles-National

19h 25m

1 stop

SEA9:40 pmSeattle/Tacoma Intl

$588

United Airlines

Jan 20

SEA7:00 amSeattle/Tacoma Intl

16h 05m

2 stops

BRU8:05 amBrussels Bruxelles-National

Jan 27

BRU10:10 amBrussels Bruxelles-National

22h 21m

3 stops

SEA11:31 pmSeattle/Tacoma Intl

$593

United Airlines

Dec 2

SEA10:49 amSeattle/Tacoma Intl

13h 06m

1 stop

BRU8:55 amBrussels Bruxelles-National

Dec 6

BRU10:10 amBrussels Bruxelles-National

20h 38m

2 stops

SEA9:48 pmSeattle/Tacoma Intl

$632

Icelandair flights from Seattle to Belgium

Our best Icelandair deals on Seattle to Belgium flight tickets

Icelandair

Dec 2

SEA2:35 pmSeattle/Tacoma Intl

12h 20m

1 stop

BRU11:55 amBrussels Bruxelles-National

Dec 6

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$484

Icelandair

Oct 18

SEA3:40 pmSeattle/Tacoma Intl

12h 15m

1 stop

BRU12:55 pmBrussels Bruxelles-National

Oct 29

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA6:00 pmSeattle/Tacoma Intl

$485

Icelandair

Oct 28

SEA3:35 pmSeattle/Tacoma Intl

12h 20m

1 stop

BRU11:55 amBrussels Bruxelles-National

Nov 8

BRU12:50 pmBrussels Bruxelles-National

13h 10m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$486

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

Wed 12/2

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Sun 12/6

12:50 pm-5:00 pm

1 stop13h 10m

$484

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 11/18

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Tue 12/1

12:50 pm-5:00 pm

1 stop13h 10m

$484

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 11/18

6:45 pm-8:10 pm

1 stop16h 25m

Brussels Bruxelles-National

Wed 11/25

12:00 pm-4:50 pm

1 stop13h 50m

$563

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 11/4

8:09 am-7:15 am

1 stop14h 06m

Brussels Bruxelles-National

Wed 11/11

11:55 am-8:56 pm

1 stop18h 01m

$570

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 11/18

6:45 pm-4:20 pm

1 stop12h 35m

Brussels Bruxelles-National

Wed 11/25

7:00 am-8:21 pm

2 stops22h 21m

$571

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 11/4

6:45 pm-4:20 pm

1 stop12h 35m

Brussels Bruxelles-National

Mon 11/9

9:15 pm-11:25 am

1 stop23h 10m

$578

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 1/20

8:00 am-7:15 am

1 stop14h 15m

Brussels Bruxelles-National

Wed 1/27

11:15 am-9:40 pm

1 stop19h 25m

$588

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Wed 1/20

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Wed 1/27

11:55 am-9:56 pm

2 stops19h 01m

$588

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 10/5

3:00 pm-7:10 am

2 stops31h 10m

Brussels Bruxelles-National

Thu 10/15

9:10 am-2:22 pm

2 stops38h 12m

$614

SeattleBrussels

SEA Seattle/Tacoma Intl - BRU Brussels Bruxelles-National

SEABRU

Seattle/Tacoma Intl

Mon 10/12

3:00 pm-7:10 am

2 stops31h 10m

Brussels Bruxelles-National

Mon 10/19

4:25 pm-4:59 pm

1 stop33h 34m

$652

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 $510.

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 $757 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 $568 on momondo.

Can stopping save me money on Seattle to Belgium flights?

You could potentially save up to 19% 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	$239
Fastest flight time	12h 15m
Direct flights	None

The best one-way flight to Belgium from Seattle in the past 72 hours is $239. The best round-trip flight deal from Seattle to Belgium found on momondo in the last 72 hours is $484.

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

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 September 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 $382	Free Cancellation	Rating 6.9 743 reviews	Search Icelandair flights
British Airways	PriceFrom $406	Free Cancellation	Rating 6.7 8,220 reviews	Search British Airways flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,579 reviews	Search KLM flights
Delta	PriceFrom $482	Free Cancellation	Rating 7.8 8,564 reviews	Search Delta flights
Lufthansa	PriceFrom $496	Free Cancellation	Rating 6.8 8,221 reviews	Search Lufthansa flights
United Airlines	PriceFrom $502	Free Cancellation	Rating 7.4 10,211 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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Popular cities in Belgium

Flights to Brusselsfrom $445

Flights to Brusselsfrom $466

Cheap flights from Seattle to Belgium from $239

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 10/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from Seattle to Belgium

Our best United Airlines deals on Seattle to Belgium flight tickets

Icelandair flights from Seattle to Belgium

Our best Icelandair 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