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Cheap flights from Seattle to Belgium from $317

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 12/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Belgium

Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
2:35 pm - 11:55 amSEA-BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pmBRU-SEA
13h 10m1 stop
$378Icelandair
Find Deal
Thu, Nov 27 - Thu, Dec 11
Icelandair Logo
3:45 pm - 12:50 pmSEA-BRU
12h 05m1 stop
Icelandair Logo
1:50 pm - 5:50 pmBRU-SEA
13h 00m1 stop
$379Icelandair
Find Deal
Thu, Apr 2 - Thu, Apr 9
Lufthansa Logo
2:00 pm - 5:30 pmSEA-BRU
18h 30m1 stop
Lufthansa Logo
10:00 am - 7:16 pmBRU-SEA
18h 16m2 stops
$457Lufthansa
Find Deal
Mon, Dec 1 - Mon, Dec 8
Lufthansa Logo
2:00 pm - 5:30 pmSEA-BRU
18h 30m1 stop
Lufthansa Logo
7:00 am - 12:10 pmBRU-SEA
14h 10m1 stop
$478Lufthansa
Find Deal
Mon, Dec 1 - Mon, Dec 8
United Airlines Logo
7:00 am - 1:15 pmSEA-BRU
21h 15m2 stops
United Airlines Logo
10:00 am - 11:49 amBRU-SEA
33h 49m2 stops
$480United Airlines
Find Deal
Tue, Feb 10 - Tue, Mar 10
British Airways Logo
6:50 pm - 4:40 pmSEA-BRU
12h 50m1 stop
British Airways Logo
8:30 pm - 5:55 pmBRU-SEA
29h 25m1 stop
$494British Airways
Find Deal
Mon, Mar 2 - Wed, Mar 11
United Airlines Logo
9:00 am - 1:15 pmSEA-BRU
19h 15m2 stops
United Airlines Logo
7:00 am - 1:10 pmBRU-SEA
14h 10m1 stop
$499United Airlines
Find Deal
Thu, Feb 26 - Thu, Mar 12
British Airways Logo
6:50 pm - 11:10 amSEA-BRU
31h 20m1 stop
British Airways Logo
8:45 pm - 12:30 pmBRU-SEA
23h 45m1 stop
$509British Airways
Find Deal
Sun, Mar 1 - Mon, Mar 9
Delta Logo
11:10 pm - 10:10 amSEA-BRU
26h 00m2 stops
Delta Logo
10:45 am - 12:35 pmBRU-SEA
33h 50m1 stop
$516Delta
Find Deal
Sat, Feb 28 - Wed, Mar 11
Delta Logo
11:35 pm - 8:00 amSEA-BRU
24h 25m1 stop
Delta Logo
3:05 pm - 11:35 amBRU-SEA
29h 30m1 stop
$557Delta
Find Deal
Thu, Mar 26 - Thu, Apr 2

Icelandair flights from Seattle to Belgium

Our best Icelandair deals on Seattle to Belgium flight tickets
Icelandair
Nov 27
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Dec 11
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$378
Find similar
Icelandair
Apr 2
SEA3:45 pmSeattle/Tacoma Intl
12h 05m
1 stop
BRU12:50 pmBrussels Bruxelles-National
Apr 9
BRU1:50 pmBrussels Bruxelles-National
13h 00m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
$379
Find similar
Icelandair
Nov 27
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Dec 11
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$381
Find similar

Lufthansa flights from Seattle to Belgium

Our best Lufthansa deals on Seattle to Belgium flight tickets
Lufthansa
Dec 1
SEA2:00 pmSeattle/Tacoma Intl
18h 30m
1 stop
BRU5:30 pmBrussels Bruxelles-National
Dec 8
BRU10:00 amBrussels Bruxelles-National
18h 16m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$457
Find similar
Lufthansa
Dec 1
SEA2:00 pmSeattle/Tacoma Intl
18h 30m
1 stop
BRU5:30 pmBrussels Bruxelles-National
Dec 8
BRU7:00 amBrussels Bruxelles-National
14h 10m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$478
Find similar
Lufthansa
Feb 10
SEA10:05 amSeattle/Tacoma Intl
18h 05m
2 stops
BRU1:10 pmBrussels Bruxelles-National
Mar 10
BRU7:00 amBrussels Bruxelles-National
14h 10m
1 stop
SEA1:10 pmSeattle/Tacoma Intl
$500
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 3, 2025.
Use the filters below to find and compare flights from Seattle to Belgium that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 11/27

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Thu 12/11

12:50 pm-5:00 pm

1 stop13h 10m

$378

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 4/2

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

Thu 4/9

1:50 pm-5:50 pm

1 stop13h 00m

$379

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 12/1

2:00 pm-5:30 pm

1 stop18h 30m

Brussels Bruxelles-National

Mon 12/8

10:00 am-7:16 pm

2 stops18h 16m

$457

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 12/1

2:00 pm-5:30 pm

1 stop18h 30m

Brussels Bruxelles-National

Mon 12/8

7:00 am-12:10 pm

1 stop14h 10m

$478

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

7:00 am-1:15 pm

2 stops21h 15m

Brussels Bruxelles-National

Tue 3/10

10:00 am-11:49 am

2 stops33h 49m

$480

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 3/2

6:50 pm-4:40 pm

1 stop12h 50m

Brussels Bruxelles-National

Wed 3/11

8:30 pm-5:55 pm

1 stop29h 25m

$494

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 2/26

9:00 am-1:15 pm

2 stops19h 15m

Brussels Bruxelles-National

Thu 3/12

7:00 am-1:10 pm

1 stop14h 10m

$499

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 3/1

6:50 pm-11:10 am

1 stop31h 20m

Brussels Bruxelles-National

Mon 3/9

8:45 pm-12:30 pm

1 stop23h 45m

$509

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 2/28

11:10 pm-10:10 am

2 stops26h 00m

Brussels Bruxelles-National

Wed 3/11

10:45 am-12:35 pm

1 stop33h 50m

$516

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 3/26

11:35 pm-8:00 am

1 stop24h 25m

Brussels Bruxelles-National

Thu 4/2

3:05 pm-11:35 am

1 stop29h 30m

$557

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Belgium from

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

What is the cheapest month to fly to Belgium?

In general, October 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 $517. If you are unable to visit Belgium during the month of October, then departing from Seattle during the month September is also very affordable. Most momondo users find prices during this month for around $518.

What is the cheapest day to depart on your flight to Belgium?

Our data shows that Tuesday is the least expensive day to fly to Belgium. Tickets to fly out on this day can be as low as $626. If your travel schedule is flexible, try to avoid departing on a Wednesday because tickets tend to average around $783. These prices are subject to change though, so be sure to set up a Price Alert for flights to Belgium.

What is the cheapest time of day to depart on your flight to Belgium?

Our most recent data shows that the best time of day to fly to Belgium is in the morning. Flights from Seattle to Belgium during this time can be as low as $668. Flights to Belgium are more costly at noon, with an average ticket price of $738. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight 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 $627 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 $524 on momondo.

Can stopping save me money on Seattle to Belgium flights?

You could potentially save up to 17% 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

Direct flights

None
There are no direct flights from Seattle to Belgium. There are no popular flight routes from Seattle to Belgium.
Search flight deals

  • 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?

  • 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
IcelandairPriceFrom $386Free CancellationRating
7.1
568 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom $488Free CancellationRating
7.5
671 reviews
Search Virgin Atlantic flights
United AirlinesPriceFrom $502Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights
British AirwaysPriceFrom $503Free CancellationRating
6.7
7,494 reviews
Search British Airways flights
Air FrancePriceFrom $506Free CancellationRating
7.4
1,482 reviews
Search Air France flights
KLMPriceFrom $511Free CancellationRating
7.7
1,405 reviews
Search KLM flights
DeltaPriceFrom $514Free CancellationRating
7.9
8,002 reviews
Search Delta flights
Aer LingusPriceFrom $532Free CancellationRating
7.2
1,365 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $556Free CancellationRating
7.1
10,400 reviews
Search Air Canada flights
LufthansaPriceFrom $561Free CancellationRating
6.8
7,547 reviews
Search Lufthansa 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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