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Cheap flights from Seattle to Brussels from $318

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 11/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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 6 - Thu, Nov 20
Icelandair Logo
2:35 pm - 11:55 amSEA-BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pmBRU-SEA
13h 10m1 stop
$383Icelandair
Find Deal
Wed, Nov 5 - Thu, Nov 13
Lufthansa Logo
2:00 pm - 1:35 pmSEA-BRU
14h 35m1 stop
Lufthansa Logo
9:05 am - 1:20 pmBRU-SEA
13h 15m1 stop
$477Lufthansa
Find Deal
Tue, Dec 2 - Wed, Dec 17
British Airways Logo
6:50 pm - 8:50 amSEA-BRU
29h 00m1 stop
British Airways Logo
5:30 pm - 4:55 pmBRU-SEA
32h 25m1 stop
$480British Airways
Find Deal
Wed, Nov 12 - Tue, Nov 18
United Airlines Logo
9:25 am - 1:15 pmSEA-BRU
18h 50m2 stops
United Airlines Logo
10:00 am - 11:49 amBRU-SEA
33h 49m2 stops
$481United Airlines
Find Deal
Tue, Feb 10 - Tue, Mar 10
Lufthansa Logo
3:10 pm - 1:10 pmSEA-BRU
13h 00m1 stop
Lufthansa Logo
7:30 pm - 12:10 pmBRU-SEA
25h 40m1 stop
$482Lufthansa
Find Deal
Sun, Dec 7 - Mon, Dec 15
Air Canada Logo
3:40 pm - 8:55 amSEA-BRU
32h 15m2 stops
Air Canada Logo
10:00 am - 7:16 pmBRU-SEA
18h 16m2 stops
$489Air Canada
Find Deal
Wed, Nov 19 - Fri, Dec 5
British Airways Logo
1:25 pm - 10:50 amSEA-BRU
12h 25m1 stop
British Airways Logo
10:55 am - 6:20 pmBRU-SEA
16h 25m1 stop
$495British Airways
Find Deal
Tue, Mar 3 - Wed, Apr 1
United Airlines Logo
10:58 am - 1:15 pmSEA-BRU
17h 17m2 stops
United Airlines Logo
7:00 am - 1:10 pmBRU-SEA
14h 10m1 stop
$500United Airlines
Find Deal
Tue, Feb 10 - Tue, Mar 10
Air Canada Logo
5:50 am - 7:50 amSEA-BRU
17h 00m2 stops
Air Canada Logo
2:25 pm - 7:16 pmBRU-SEA
37h 51m2 stops
$517Air Canada
Find Deal
Wed, Nov 12 - Tue, Nov 18

Icelandair flights from Seattle to Brussels

Our best Icelandair deals on Seattle to Brussels flight tickets
Icelandair
Nov 6
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Nov 20
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$378
Find similar
Icelandair
Nov 5
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Nov 13
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$383
Find similar
Icelandair
Nov 5
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
BRU11:55 amBrussels Bruxelles-National
Nov 13
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$389
Find similar

Lufthansa flights from Seattle to Brussels

Our best Lufthansa deals on Seattle to Brussels flight tickets
Lufthansa
Dec 2
SEA2:00 pmSeattle/Tacoma Intl
14h 35m
1 stop
BRU1:35 pmBrussels Bruxelles-National
Dec 17
BRU9:05 amBrussels Bruxelles-National
13h 15m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$477
Find similar
Lufthansa
Dec 7
SEA3:10 pmSeattle/Tacoma Intl
13h 00m
1 stop
BRU1:10 pmBrussels Bruxelles-National
Dec 15
BRU7:30 pmBrussels Bruxelles-National
25h 40m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$482
Find similar
Lufthansa
Nov 19
SEA3:10 pmSeattle/Tacoma Intl
19h 45m
1 stop
BRU7:55 pmBrussels Bruxelles-National
Dec 5
BRU10:00 amBrussels Bruxelles-National
18h 16m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$497
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 October 13, 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

Thu 11/6

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Thu 11/20

12:50 pm-5:00 pm

1 stop13h 10m

$378

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 11/5

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Thu 11/13

12:50 pm-5:00 pm

1 stop13h 10m

$383

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 12/2

2:00 pm-1:35 pm

1 stop14h 35m

Brussels Bruxelles-National

Wed 12/17

9:05 am-1:20 pm

1 stop13h 15m

$477

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 11/12

6:50 pm-8:50 am

1 stop29h 00m

Brussels Bruxelles-National

Tue 11/18

5:30 pm-4:55 pm

1 stop32h 25m

$480

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

9:25 am-1:15 pm

2 stops18h 50m

Brussels Bruxelles-National

Tue 3/10

10:00 am-11:49 am

2 stops33h 49m

$481

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 12/7

3:10 pm-1:10 pm

1 stop13h 00m

Brussels Bruxelles-National

Mon 12/15

7:30 pm-12:10 pm

1 stop25h 40m

$482

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 11/19

3:40 pm-8:55 am

2 stops32h 15m

Brussels Bruxelles-National

Fri 12/5

10:00 am-7:16 pm

2 stops18h 16m

$489

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 3/3

1:25 pm-10:50 am

1 stop12h 25m

Brussels Bruxelles-National

Wed 4/1

10:55 am-6:20 pm

1 stop16h 25m

$495

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

10:58 am-1:15 pm

2 stops17h 17m

Brussels Bruxelles-National

Tue 3/10

7:00 am-1:10 pm

1 stop14h 10m

$500

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 11/12

5:50 am-7:50 am

2 stops17h 00m

Brussels Bruxelles-National

Tue 11/18

2:25 pm-7:16 pm

2 stops37h 51m

$517

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 $463. 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 $518.

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 $623 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 $524 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

Direct flights

None
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 20m 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 $392Free CancellationRating
7.0
555 reviews
Search Icelandair flights
United AirlinesPriceFrom $483Free CancellationRating
7.4
8,973 reviews
Search United Airlines flights
Virgin AtlanticPriceFrom $488Free CancellationRating
7.4
667 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom $502Free CancellationRating
6.7
7,453 reviews
Search British Airways flights
Air FrancePriceFrom $506Free CancellationRating
7.4
1,473 reviews
Search Air France flights
KLMPriceFrom $511Free CancellationRating
7.7
1,402 reviews
Search KLM flights
DeltaPriceFrom $514Free CancellationRating
7.9
7,973 reviews
Search Delta flights
Aer LingusPriceFrom $532Free CancellationRating
7.2
1,334 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $556Free CancellationRating
7.1
10,286 reviews
Search Air Canada flights
LufthansaPriceFrom $561Free CancellationRating
6.8
7,479 reviews
Search Lufthansa 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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1 adult
Wed 11/12
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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