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Cheap flights from Seattle to Brussels from $345

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 1/6. 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 Brussels

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
$388Icelandair
Find Deal
Sat, Jan 10 - Fri, Jan 23
Icelandair Logo
2:35 pm - 11:55 amSEA-BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pmBRU-SEA
13h 10m1 stop
$415Icelandair
Find Deal
Sat, Feb 7 - Thu, Feb 26
British Airways Logo
6:50 pm - 7:45 pmSEA-BRU
15h 55m1 stop
British Airways Logo
12:00 pm - 5:55 pmBRU-SEA
13h 55m1 stop
$435British Airways
Find Deal
Tue, Feb 10 - Tue, Mar 10
Lufthansa Logo
3:40 pm - 7:50 amSEA-BRU
31h 10m2 stops
Lufthansa Logo
7:00 am - 12:10 pmBRU-SEA
14h 10m1 stop
$438Lufthansa
Find Deal
Thu, Jan 8 - Thu, Jan 15
Icelandair Logo
2:35 pm - 11:55 amSEA-BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pmBRU-SEA
13h 10m1 stop
$441Icelandair
Find Deal
Thu, Dec 4 - Sun, Jan 18
Brussels Airlines Logo
7:00 am - 8:55 amSEA-BRU
40h 55m2 stops
Brussels Airlines Logo
11:55 am - 8:57 pmBRU-SEA
18h 02m1 stop
$444Brussels Airlines
Find Deal
Fri, Jan 9 - Fri, Jan 16
British Airways Logo
8:04 am - 7:45 pmSEA-BRU
26h 41m2 stops
British Airways Logo
9:45 pm - 5:55 pmBRU-SEA
28h 10m1 stop
$456British Airways
Find Deal
Tue, Feb 10 - Tue, Mar 10
Air Canada Logo
8:00 pm - 7:50 amSEA-BRU
50h 50m2 stops
Air Canada Logo
10:00 am - 9:31 amBRU-SEA
32h 31m2 stops
$461Air Canada
Find Deal
Sat, Jan 10 - Fri, Jan 23
Air Canada Logo
8:00 pm - 7:50 amSEA-BRU
26h 50m2 stops
Air Canada Logo
10:00 am - 10:06 pmBRU-SEA
21h 06m2 stops
$463Air Canada
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Wed, Jan 7 - Wed, Jan 14
Multiple Airlines Logo
8:00 pm - 7:50 amSEA-BRU
50h 50m2 stops
Multiple Airlines Logo
10:00 am - 7:16 pmBRU-SEA
18h 16m2 stops
$465Multiple Airlines
Find Deal
Sat, Jan 10 - Fri, Jan 23

Icelandair flights from Seattle to Brussels

Our best Icelandair deals on Seattle to Brussels flight tickets
Icelandair
Mar 25
SEA3:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Mar 30
BRU1:50 pmBrussels Bruxelles-National
15h 55m
1 stop
SEA8:45 pmSeattle/Tacoma Intl
$371
Find similar
Icelandair
Mar 25
SEA3:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Mar 30
BRU1:50 pmBrussels Bruxelles-National
13h 00m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
$381
Find similar
Icelandair
Mar 25
SEA3:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Mar 30
BRU1:50 pmBrussels Bruxelles-National
15h 55m
1 stop
SEA8:45 pmSeattle/Tacoma Intl
$385
Find similar

British Airways flights from Seattle to Brussels

Our best British Airways deals on Seattle to Brussels flight tickets
British Airways
Feb 4
SEA6:50 pmSeattle/Tacoma Intl
15h 45m
1 stop
BRU7:35 pmBrussels Bruxelles-National
Feb 9
BRU8:45 pmBrussels Bruxelles-National
29h 10m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$435
Find similar
British Airways
Mar 22
SEA7:50 pmSeattle/Tacoma Intl
12h 50m
1 stop
BRU4:40 pmBrussels Bruxelles-National
Apr 1
BRU10:55 amBrussels Bruxelles-National
16h 30m
1 stop
SEA6:25 pmSeattle/Tacoma Intl
$447
Find similar
British Airways
Mar 22
SEA7:50 pmSeattle/Tacoma Intl
31h 20m
1 stop
BRU11:10 amBrussels Bruxelles-National
Mar 31
BRU8:25 pmBrussels Bruxelles-National
31h 00m
1 stop
SEA6:25 pmSeattle/Tacoma Intl
$453
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Brussels 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 26, 2025.
Use the filters below to find and compare flights from Seattle to Brussels that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 1/10

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Fri 1/23

12:50 pm-5:00 pm

1 stop13h 10m

$388

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 2/7

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Thu 2/26

12:50 pm-5:00 pm

1 stop13h 10m

$415

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

6:50 pm-7:45 pm

1 stop15h 55m

Brussels Bruxelles-National

Tue 3/10

12:00 pm-5:55 pm

1 stop13h 55m

$435

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/8

3:40 pm-7:50 am

2 stops31h 10m

Brussels Bruxelles-National

Thu 1/15

7:00 am-12:10 pm

1 stop14h 10m

$438

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 12/4

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Sun 1/18

12:50 pm-5:00 pm

1 stop13h 10m

$441

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Fri 1/9

7:00 am-8:55 am

2 stops40h 55m

Brussels Bruxelles-National

Fri 1/16

11:55 am-8:57 pm

1 stop18h 02m

$444

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

8:04 am-7:45 pm

2 stops26h 41m

Brussels Bruxelles-National

Tue 3/10

9:45 pm-5:55 pm

1 stop28h 10m

$456

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 1/10

8:00 pm-7:50 am

2 stops50h 50m

Brussels Bruxelles-National

Fri 1/23

10:00 am-9:31 am

2 stops32h 31m

$461

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 1/7

8:00 pm-7:50 am

2 stops26h 50m

Brussels Bruxelles-National

Wed 1/14

10:00 am-10:06 pm

2 stops21h 06m

$463

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sat 1/10

8:00 pm-7:50 am

2 stops50h 50m

Brussels Bruxelles-National

Fri 1/23

10:00 am-7:16 pm

2 stops18h 16m

$465

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 Brussels from

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

What is the cheapest month to fly to Brussels?

In general, October 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 $476. If you are unable to visit Brussels 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 $514.

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

On average, the least expensive day to fly to Brussels from Seattle is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $626. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Wednesday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $783.

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

According to our data, the cheapest time of day to fly to Brussels is in the morning. momondo users have found flights departing from Seattle to Brussels in the morning for as low as $668. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $738.

How far in advance should I book a flight 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 $636 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 $537 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

Fastest flight time

12h 05m

Direct flights

None
The fastest flight from Seattle to Brussels takes 12h 05m
There are no direct flights from Seattle to Brussels. There are no popular flight routes from Seattle to Brussels.
Search flight deals

  • 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 05m 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?

  • 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
IcelandairPriceFrom $388Free CancellationRating
7.0
581 reviews
Search Icelandair flights
DeltaPriceFrom $482Free CancellationRating
7.9
7,998 reviews
Search Delta flights
United AirlinesPriceFrom $483Free CancellationRating
7.4
9,046 reviews
Search United Airlines flights
Virgin AtlanticPriceFrom $488Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
LufthansaPriceFrom $501Free CancellationRating
6.8
7,594 reviews
Search Lufthansa flights
British AirwaysPriceFrom $503Free CancellationRating
6.7
7,539 reviews
Search British Airways flights
Air FrancePriceFrom $506Free CancellationRating
7.4
1,497 reviews
Search Air France flights
KLMPriceFrom $511Free CancellationRating
7.7
1,422 reviews
Search KLM flights
Aer LingusPriceFrom $532Free CancellationRating
7.2
1,381 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $559Free CancellationRating
7.1
10,476 reviews
Search Air Canada 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.

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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
Brussels Bruxelles-National Airport
Charleroi Brussels Airport