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Cheap flights from Seattle to Belgium from $255

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 10/18. 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

Icelandair Logo
3:45 pm - 12:50 pmSEA-BRU
12h 05m1 stop
Icelandair Logo
1:50 pm - 8:40 pmBRU-SEA
15h 50m1 stop
$400Icelandair
Find Deal
Sun, Oct 12 - Fri, Oct 24
Icelandair Logo
2:35 pm - 11:55 amSEA-BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pmBRU-SEA
13h 10m1 stop
$409Icelandair
Find Deal
Wed, Jan 21 - Sun, Jan 25
United Airlines Logo
5:00 am - 7:15 amSEA-BRU
17h 15m2 stops
United Airlines Logo
10:00 am - 6:59 pmBRU-SEA
40h 59m2 stops
$435United Airlines
Find Deal
Tue, Feb 10 - Tue, Mar 10
United Airlines Logo
7:00 am - 8:05 amSEA-BRU
16h 05m2 stops
United Airlines Logo
10:00 am - 11:28 amBRU-SEA
34h 28m2 stops
$439United Airlines
Find Deal
Wed, Nov 12 - Tue, Nov 18
British Airways Logo
6:50 pm - 4:40 pmSEA-BRU
12h 50m1 stop
British Airways Logo
11:50 am - 11:30 amBRU-SEA
32h 40m1 stop
$476British Airways
Find Deal
Sun, Jan 18 - Mon, Jan 26
Delta Logo
7:25 am - 8:40 amSEA-BRU
16h 15m1 stop
Delta Logo
11:00 am - 10:18 amBRU-SEA
32h 18m1 stop
$500Delta
Find Deal
Thu, Oct 23 - Thu, Nov 6
Delta Logo
7:25 am - 8:40 amSEA-BRU
16h 15m1 stop
Delta Logo
11:00 am - 10:18 amBRU-SEA
32h 18m1 stop
$502Delta
Find Deal
Thu, Oct 23 - Thu, Nov 6
Lufthansa Logo
3:00 pm - 1:35 pmSEA-BRU
14h 35m1 stop
Lufthansa Logo
10:00 am - 7:16 pmBRU-SEA
18h 16m2 stops
$505Lufthansa
Find Deal
Thu, Oct 30 - Thu, Nov 6
British Airways Logo
6:50 pm - 4:40 pmSEA-BRU
12h 50m1 stop
British Airways Logo
7:25 pm - 4:55 pmBRU-SEA
30h 30m1 stop
$526British Airways
Find Deal
Sun, Jan 18 - Sat, Jan 24
Lufthansa Logo
3:00 pm - 1:35 pmSEA-BRU
14h 35m1 stop
Lufthansa Logo
7:00 am - 12:10 pmBRU-SEA
14h 10m1 stop
$548Lufthansa
Find Deal
Thu, Oct 30 - Thu, Nov 6

Lufthansa flights from Seattle to Belgium

Our best Lufthansa deals on Seattle to Belgium flight tickets
Lufthansa
Oct 30
SEA3:00 pmSeattle/Tacoma Intl
14h 35m
1 stop
BRU1:35 pmBrussels Bruxelles-National
Nov 6
BRU10:00 amBrussels Bruxelles-National
18h 16m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$505
Find similar
Lufthansa
Oct 30
SEA3:00 pmSeattle/Tacoma Intl
14h 35m
1 stop
BRU1:35 pmBrussels Bruxelles-National
Nov 6
BRU7:00 amBrussels Bruxelles-National
14h 10m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$548
Find similar
Lufthansa
Sep 24
SEA6:50 pmSeattle/Tacoma Intl
12h 25m
1 stop
BRU4:15 pmBrussels Bruxelles-National
Oct 11
BRU9:35 amBrussels Bruxelles-National
35h 20m
2 stops
SEA11:55 amSeattle/Tacoma Intl
$645
Find similar

Icelandair flights from Seattle to Belgium

Our best Icelandair deals on Seattle to Belgium flight tickets
Icelandair
Oct 12
SEA3:45 pmSeattle/Tacoma Intl
12h 05m
1 stop
BRU12:50 pmBrussels Bruxelles-National
Oct 24
BRU1:50 pmBrussels Bruxelles-National
15h 50m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$400
Find similar
Icelandair
Jan 21
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Jan 25
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$409
Find similar
Icelandair
Jan 21
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Jan 30
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$416
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 September 17, 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

Sun 10/12

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

Fri 10/24

1:50 pm-8:40 pm

1 stop15h 50m

$400

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 1/21

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Sun 1/25

12:50 pm-5:00 pm

1 stop13h 10m

$409

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

5:00 am-7:15 am

2 stops17h 15m

Brussels Bruxelles-National

Tue 3/10

10:00 am-6:59 pm

2 stops40h 59m

$435

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 11/12

7:00 am-8:05 am

2 stops16h 05m

Brussels Bruxelles-National

Tue 11/18

10:00 am-11:28 am

2 stops34h 28m

$439

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 1/18

6:50 pm-4:40 pm

1 stop12h 50m

Brussels Bruxelles-National

Mon 1/26

11:50 am-11:30 am

1 stop32h 40m

$476

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 10/23

7:25 am-8:40 am

1 stop16h 15m

Brussels Bruxelles-National

Thu 11/6

11:00 am-10:18 am

1 stop32h 18m

$500

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 10/23

7:25 am-8:40 am

1 stop16h 15m

Brussels Bruxelles-National

Thu 11/6

11:00 am-10:18 am

1 stop32h 18m

$502

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 10/30

3:00 pm-1:35 pm

1 stop14h 35m

Brussels Bruxelles-National

Thu 11/6

10:00 am-7:16 pm

2 stops18h 16m

$505

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 1/18

6:50 pm-4:40 pm

1 stop12h 50m

Brussels Bruxelles-National

Sat 1/24

7:25 pm-4:55 pm

1 stop30h 30m

$526

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 10/30

3:00 pm-1:35 pm

1 stop14h 35m

Brussels Bruxelles-National

Thu 11/6

7:00 am-12:10 pm

1 stop14h 10m

$548

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, September 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 $527. If you are unable to visit Belgium during the month of September, then departing from Seattle during the month October is also very affordable. Most momondo users find prices during this month for around $533.

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 $628 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 $513 on momondo.

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 $391Free CancellationRating
7.0
545 reviews
Search Icelandair flights
United AirlinesPriceFrom $483Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
Virgin AtlanticPriceFrom $488Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom $502Free CancellationRating
6.7
7,367 reviews
Search British Airways flights
Air FrancePriceFrom $506Free CancellationRating
7.4
1,468 reviews
Search Air France flights
KLMPriceFrom $511Free CancellationRating
7.8
1,386 reviews
Search KLM flights
DeltaPriceFrom $514Free CancellationRating
7.9
7,961 reviews
Search Delta flights
Aer LingusPriceFrom $532Free CancellationRating
7.2
1,277 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
LufthansaPriceFrom $561Free CancellationRating
6.8
7,409 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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