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Cheap flights from Seattle to Brussels from $323

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 11/27. 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

Icelandair Logo
3:45 pm - 12:50 pmSEA-BRU
12h 05m1 stop
Icelandair Logo
12:50 pm - 5:00 pmBRU-SEA
13h 10m1 stop
$478Icelandair
Find Deal
Wed, Oct 15 - Sun, Nov 2
United Airlines Logo
8:00 am - 7:15 amSEA-BRU
14h 15m1 stop
United Airlines Logo
10:00 am - 8:10 pmBRU-SEA
42h 10m2 stops
$484United Airlines
Find Deal
Tue, Feb 10 - Tue, Mar 10
Lufthansa Logo
7:00 am - 10:10 amSEA-BRU
18h 10m2 stops
Lufthansa Logo
10:00 am - 7:16 pmBRU-SEA
18h 16m2 stops
$490Lufthansa
Find Deal
Wed, Nov 12 - Tue, Nov 18
Icelandair Logo
3:45 pm - 12:50 pmSEA-BRU
12h 05m1 stop
Icelandair Logo
1:50 pm - 5:50 pmBRU-SEA
13h 00m1 stop
$493Icelandair
Find Deal
Fri, Oct 10 - Fri, Oct 17
Lufthansa Logo
3:10 pm - 1:00 pmSEA-BRU
12h 50m1 stop
Lufthansa Logo
7:00 am - 12:10 pmBRU-SEA
14h 10m1 stop
$494Lufthansa
Find Deal
Wed, Nov 12 - Tue, Nov 18
KLM Logo
3:05 pm - 10:20 pmSEA-BRU
22h 15m1 stop
KLM Logo
10:00 am - 7:25 pmBRU-SEA
17h 25m1 stop
$511KLM
Find Deal
Tue, Feb 10 - Tue, Mar 10
Delta Logo
7:20 am - 2:15 pmSEA-BRU
21h 55m2 stops
Delta Logo
10:00 am - 7:25 pmBRU-SEA
17h 25m1 stop
$515Delta
Find Deal
Tue, Feb 10 - Tue, Mar 10
British Airways Logo
1:25 pm - 5:00 pmSEA-BRU
18h 35m1 stop
British Airways Logo
10:15 am - 5:55 pmBRU-SEA
15h 40m1 stop
$520British Airways
Find Deal
Tue, Feb 24 - Thu, Mar 12
British Airways Logo
6:50 pm - 4:40 pmSEA-BRU
12h 50m1 stop
British Airways Logo
11:50 am - 4:55 pmBRU-SEA
14h 05m1 stop
$525British Airways
Find Deal
Mon, Jan 5 - Wed, Jan 14
Delta Logo
11:00 pm - 9:00 amSEA-BRU
25h 00m1 stop
Delta Logo
6:15 am - 12:14 amBRU-SEA
26h 59m2 stops
$602Delta
Find Deal
Tue, Dec 23 - Wed, Dec 31

Air Canada flights from Seattle to Brussels

Our best Air Canada deals on Seattle to Brussels flight tickets
Air Canada
Oct 15
SEA7:30 amSeattle/Tacoma Intl
15h 20m
1 stop
BRU7:50 amBrussels Bruxelles-National
Nov 2
BRU10:00 amBrussels Bruxelles-National
18h 16m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$499
Find similar
Air Canada
Oct 15
SEA5:30 amSeattle/Tacoma Intl
17h 35m
2 stops
BRU8:05 amBrussels Bruxelles-National
Oct 31
BRU10:00 amBrussels Bruxelles-National
36h 26m
2 stops
SEA2:26 pmSeattle/Tacoma Intl
$508
Find similar
Air Canada
Feb 10
SEA8:00 pmSeattle/Tacoma Intl
26h 50m
2 stops
BRU7:50 amBrussels Bruxelles-National
Mar 10
BRU10:00 amBrussels Bruxelles-National
37h 01m
2 stops
SEA3:01 pmSeattle/Tacoma Intl
$513
Find similar

Icelandair flights from Seattle to Brussels

Our best Icelandair deals on Seattle to Brussels flight tickets
Icelandair
Oct 15
SEA3:45 pmSeattle/Tacoma Intl
12h 05m
1 stop
BRU12:50 pmBrussels Bruxelles-National
Nov 2
BRU12:50 pmBrussels Bruxelles-National
13h 10m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$478
Find similar
Icelandair
Oct 10
SEA3:45 pmSeattle/Tacoma Intl
12h 05m
1 stop
BRU12:50 pmBrussels Bruxelles-National
Oct 17
BRU1:50 pmBrussels Bruxelles-National
13h 00m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
$493
Find similar
Icelandair
Sep 1
SEA7:00 pmSeattle/Tacoma Intl
32h 50m
1 stop
BRU12:50 pmBrussels Bruxelles-National
Oct 2
BRU1:50 pmBrussels Bruxelles-National
15h 50m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$499
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 August 28, 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

Wed 10/15

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

Sun 11/2

12:50 pm-5:00 pm

1 stop13h 10m

$478

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

8:00 am-7:15 am

1 stop14h 15m

Brussels Bruxelles-National

Tue 3/10

10:00 am-8:10 pm

2 stops42h 10m

$484

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 11/12

7:00 am-10:10 am

2 stops18h 10m

Brussels Bruxelles-National

Tue 11/18

10:00 am-7:16 pm

2 stops18h 16m

$490

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Fri 10/10

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

Fri 10/17

1:50 pm-5:50 pm

1 stop13h 00m

$493

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 11/12

3:10 pm-1:00 pm

1 stop12h 50m

Brussels Bruxelles-National

Tue 11/18

7:00 am-12:10 pm

1 stop14h 10m

$494

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

3:05 pm-10:20 pm

1 stop22h 15m

Brussels Bruxelles-National

Tue 3/10

10:00 am-7:25 pm

1 stop17h 25m

$511

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/10

7:20 am-2:15 pm

2 stops21h 55m

Brussels Bruxelles-National

Tue 3/10

10:00 am-7:25 pm

1 stop17h 25m

$515

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 2/24

1:25 pm-5:00 pm

1 stop18h 35m

Brussels Bruxelles-National

Thu 3/12

10:15 am-5:55 pm

1 stop15h 40m

$520

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 1/5

6:50 pm-4:40 pm

1 stop12h 50m

Brussels Bruxelles-National

Wed 1/14

11:50 am-4:55 pm

1 stop14h 05m

$525

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 12/23

11:00 pm-9:00 am

1 stop25h 00m

Brussels Bruxelles-National

Wed 12/31

6:15 am-12:14 am

2 stops26h 59m

$602

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 typical price of a round-trip flight between Seattle and Brussels?

What is the cheapest month to fly to Brussels?

In general, September 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 $527. If you are unable to visit Brussels during the month of September, then departing from Seattle during the month November is also very affordable. Most momondo users find prices during this month for around $534.

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 $622 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 $515 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 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 $391Free CancellationRating
7.0
537 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom $488Free CancellationRating
7.4
661 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom $501Free CancellationRating
6.7
7,316 reviews
Search British Airways flights
Air FrancePriceFrom $506Free CancellationRating
7.4
1,469 reviews
Search Air France flights
KLMPriceFrom $511Free CancellationRating
7.8
1,382 reviews
Search KLM flights
DeltaPriceFrom $514Free CancellationRating
7.9
7,977 reviews
Search Delta flights
United AirlinesPriceFrom $522Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights
Aer LingusPriceFrom $532Free CancellationRating
7.2
1,239 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
LufthansaPriceFrom $570Free CancellationRating
6.8
7,368 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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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