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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 1/24. 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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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 am
SEA
-
BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pm
BRU
-
SEA
13h 10m1 stop
$381Icelandair
Thu, Jan 15 - Thu, Jan 29
Icelandair Logo
2:35 pm - 11:55 am
SEA
-
BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pm
BRU
-
SEA
13h 10m1 stop
$389Icelandair
Thu, Jan 15 - Thu, Jan 29
Icelandair Logo
2:35 pm - 11:55 am
SEA
-
BRU
12h 20m1 stop
Icelandair Logo
12:50 pm - 5:00 pm
BRU
-
SEA
13h 10m1 stop
$416Icelandair
Wed, Jan 28 - Sun, Feb 1
Icelandair Logo
3:35 pm - 11:55 am
SEA
-
BRU
12h 20m1 stop
Icelandair Logo
1:50 pm - 8:40 pm
BRU
-
SEA
15h 50m1 stop
$445Icelandair
Wed, Mar 25 - Mon, Mar 30
Lufthansa Logo
7:00 am - 8:55 am
SEA
-
BRU
16h 55m1 stop
Lufthansa Logo
9:05 am - 1:20 pm
BRU
-
SEA
13h 15m1 stop
$460Lufthansa
Wed, Jan 21 - Sun, Jan 25
Lufthansa Logo
9:55 am - 1:35 pm
SEA
-
BRU
18h 40m2 stops
Lufthansa Logo
6:45 am - 1:20 pm
BRU
-
SEA
15h 35m1 stop
$464Lufthansa
Wed, Jan 21 - Sun, Jan 25
Air Canada Logo
8:10 am - 1:15 pm
SEA
-
BRU
20h 05m2 stops
Air Canada Logo
10:00 am - 9:31 am
BRU
-
SEA
32h 31m2 stops
$468Air Canada
Thu, Jan 15 - Thu, Jan 29
Air Canada Logo
8:10 am - 1:15 pm
SEA
-
BRU
20h 05m2 stops
Air Canada Logo
10:00 am - 9:31 am
BRU
-
SEA
32h 31m2 stops
$469Air Canada
Thu, Jan 15 - Thu, Jan 29
Multiple Airlines Logo
3:40 pm - 8:00 pm
SEA
-
BRU
19h 20m2 stops
Multiple Airlines Logo
10:00 am - 10:06 pm
BRU
-
SEA
21h 06m2 stops
$472Multiple Airlines
Thu, Jan 15 - Thu, Jan 29
Multiple Airlines Logo
3:40 pm - 8:00 pm
SEA
-
BRU
19h 20m2 stops
Multiple Airlines Logo
10:00 am - 10:16 pm
BRU
-
SEA
21h 16m2 stops
$473Multiple Airlines
Thu, Feb 5 - Fri, Feb 13

Air Canada flights from Seattle to Brussels

Our best Air Canada deals on Seattle to Brussels flight tickets
Air Canada
Jan 23
SEA3:40 pmSeattle/Tacoma Intl
36h 35m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 30
BRU10:00 amBrussels Bruxelles-National
42h 16m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$462
Find similar
Air Canada
Jan 15
SEA8:10 amSeattle/Tacoma Intl
20h 05m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 29
BRU10:00 amBrussels Bruxelles-National
32h 31m
2 stops
SEA9:31 amSeattle/Tacoma Intl
$468
Find similar
Air Canada
Jan 15
SEA8:10 amSeattle/Tacoma Intl
20h 05m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 29
BRU10:00 amBrussels Bruxelles-National
32h 31m
2 stops
SEA9:31 amSeattle/Tacoma Intl
$469
Find similar

United Airlines flights from Seattle to Brussels

Our best United Airlines deals on Seattle to Brussels flight tickets
United Airlines
Jan 28
SEA8:40 amSeattle/Tacoma Intl
19h 35m
3 stops
BRU1:15 pmBrussels Bruxelles-National
Feb 1
BRU10:00 amBrussels Bruxelles-National
45h 43m
2 stops
SEA10:43 pmSeattle/Tacoma Intl
$484
Find similar
United Airlines
Jan 28
SEA7:00 amSeattle/Tacoma Intl
16h 55m
1 stop
BRU8:55 amBrussels Bruxelles-National
Feb 1
BRU10:00 amBrussels Bruxelles-National
45h 43m
2 stops
SEA10:43 pmSeattle/Tacoma Intl
$488
Find similar
United Airlines
Jan 15
SEA12:25 pmSeattle/Tacoma Intl
15h 50m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 29
BRU11:55 amBrussels Bruxelles-National
18h 02m
1 stop
SEA8:57 pmSeattle/Tacoma Intl
$495
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 December 11, 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 1/15

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Thu 1/29

12:50 pm-5:00 pm

1 stop13h 10m

$381

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/15

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Thu 1/29

12:50 pm-5:00 pm

1 stop13h 10m

$389

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 1/28

2:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Sun 2/1

12:50 pm-5:00 pm

1 stop13h 10m

$416

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 3/25

3:35 pm-11:55 am

1 stop12h 20m

Brussels Bruxelles-National

Mon 3/30

1:50 pm-8:40 pm

1 stop15h 50m

$445

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 1/21

7:00 am-8:55 am

1 stop16h 55m

Brussels Bruxelles-National

Sun 1/25

9:05 am-1:20 pm

1 stop13h 15m

$460

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 1/21

9:55 am-1:35 pm

2 stops18h 40m

Brussels Bruxelles-National

Sun 1/25

6:45 am-1:20 pm

1 stop15h 35m

$464

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/15

8:10 am-1:15 pm

2 stops20h 05m

Brussels Bruxelles-National

Thu 1/29

10:00 am-9:31 am

2 stops32h 31m

$468

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/15

8:10 am-1:15 pm

2 stops20h 05m

Brussels Bruxelles-National

Thu 1/29

10:00 am-9:31 am

2 stops32h 31m

$469

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 1/15

3:40 pm-8:00 pm

2 stops19h 20m

Brussels Bruxelles-National

Thu 1/29

10:00 am-10:06 pm

2 stops21h 06m

$472

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 2/5

3:40 pm-8:00 pm

2 stops19h 20m

Brussels Bruxelles-National

Fri 2/13

10:00 am-10:16 pm

2 stops21h 16m

$473

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, 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 $628 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 15m

Direct flights

None
The fastest flight from Seattle to Brussels takes 12h 15m
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 15m 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 $387Free CancellationRating
7.0
589 reviews
Search Icelandair flights
DeltaPriceFrom $482Free CancellationRating
7.9
8,007 reviews
Search Delta flights
United AirlinesPriceFrom $483Free CancellationRating
7.4
9,094 reviews
Search United Airlines flights
Virgin AtlanticPriceFrom $488Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
LufthansaPriceFrom $501Free CancellationRating
6.8
7,626 reviews
Search Lufthansa flights
Air FrancePriceFrom $506Free CancellationRating
7.4
1,504 reviews
Search Air France flights
KLMPriceFrom $511Free CancellationRating
7.7
1,432 reviews
Search KLM flights
Air CanadaPriceFrom $518Free CancellationRating
7.1
10,517 reviews
Search Air Canada flights
British AirwaysPriceFrom $519Free CancellationRating
6.7
7,571 reviews
Search British Airways flights
Aer LingusPriceFrom $532Free CancellationRating
7.2
1,394 reviews
Search Aer Lingus 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