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Cheap flights from Seattle to Brussels from $298

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 8/26. 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
7:00 pm - 12:55 pm
SEA
-
BRU
32h 55m
1 stop
Icelandair Logo
1:50 pm - 8:40 pm
BRU
-
SEA
15h 50m
1 stop
$647Icelandair
Tue, Sep 29 - Fri, Oct 9
Icelandair Logo
3:40 pm - 12:55 pm
SEA
-
BRU
12h 15m
1 stop
Icelandair Logo
12:50 pm - 6:00 pm
BRU
-
SEA
13h 10m
1 stop
$648Icelandair
Sun, Oct 18 - Thu, Oct 29
Icelandair Logo
7:00 pm - 12:55 pm
SEA
-
BRU
32h 55m
1 stop
Icelandair Logo
1:50 pm - 5:55 pm
BRU
-
SEA
13h 05m
1 stop
$650Icelandair
Mon, Oct 5 - Thu, Oct 15
Icelandair Logo
3:40 pm - 12:55 pm
SEA
-
BRU
12h 15m
1 stop
Icelandair Logo
1:50 pm - 8:40 pm
BRU
-
SEA
15h 50m
1 stop
$652Icelandair
Thu, Oct 1 - Fri, Oct 16
Icelandair Logo
7:00 pm - 12:55 pm
SEA
-
BRU
32h 55m
1 stop
Icelandair Logo
1:50 pm - 5:55 pm
BRU
-
SEA
13h 05m
1 stop
$654Icelandair
Fri, Oct 2 - Fri, Oct 16
Icelandair Logo
11:25 pm - 12:55 pm
SEA
-
BRU
28h 30m
1 stop
Icelandair Logo
1:50 pm - 8:40 pm
BRU
-
SEA
15h 50m
1 stop
$658Icelandair
Wed, Sep 2 - Fri, Sep 11
Icelandair Logo
7:00 pm - 12:55 pm
SEA
-
BRU
32h 55m
1 stop
Icelandair Logo
1:50 pm - 5:55 pm
BRU
-
SEA
13h 05m
1 stop
$659Icelandair
Wed, Sep 2 - Fri, Sep 11
Icelandair Logo
11:25 pm - 12:55 pm
SEA
-
BRU
28h 30m
1 stop
Icelandair Logo
1:50 pm - 8:40 pm
BRU
-
SEA
15h 50m
1 stop
$660Icelandair
Wed, Sep 2 - Fri, Sep 11
Multiple Airlines Logo
10:30 am - 10:45 pm
SEA
-
CRL
27h 15m
2 stops
Multiple Airlines Logo
9:20 am - 10:05 am
CRL
-
SEA
33h 45m
3 stops
$935Multiple Airlines
Fri, Jun 5 - Wed, Jun 10
Multiple Airlines Logo
3:40 pm - 9:15 pm
SEA
-
CRL
20h 35m
2 stops
Multiple Airlines Logo
9:20 am - 6:45 pm
CRL
-
SEA
42h 25m
3 stops
$951Multiple Airlines
Tue, Aug 25 - Wed, Sep 9

United Airlines flights from Seattle to Brussels

Our best United Airlines deals on Seattle to Brussels flight tickets
United Airlines
Oct 5
SEA10:58 pmSeattle/Tacoma Intl
23h 47m
1 stop
BRU7:45 amBrussels Bruxelles-National
Oct 15
BRU9:25 amBrussels Bruxelles-National
39h 26m
2 stops
SEA3:51 pmSeattle/Tacoma Intl
$768
United Airlines
Oct 7
SEA10:30 amSeattle/Tacoma Intl
24h 30m
2 stops
BRU8:00 pmBrussels Bruxelles-National
Oct 14
BRU8:30 amBrussels Bruxelles-National
12h 50m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$778
United Airlines
Sep 30
SEA7:00 amSeattle/Tacoma Intl
21h 15m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Oct 14
BRU7:00 amBrussels Bruxelles-National
14h 20m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$782

Air Canada flights from Seattle to Brussels

Our best Air Canada deals on Seattle to Brussels flight tickets
Air Canada
Oct 5
SEA3:00 pmSeattle/Tacoma Intl
20h 00m
2 stops
BRU8:00 pmBrussels Bruxelles-National
Oct 14
BRU9:25 amBrussels Bruxelles-National
22h 17m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$773
Air Canada
Sep 2
SEA5:45 amSeattle/Tacoma Intl
16h 25m
2 stops
BRU7:10 amBrussels Bruxelles-National
Sep 11
BRU9:25 amBrussels Bruxelles-National
22h 17m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$780
Air Canada
Aug 7
SEA3:00 pmSeattle/Tacoma Intl
55h 10m
2 stops
BRU7:10 amBrussels Bruxelles-National
Sep 22
BRU9:55 amBrussels Bruxelles-National
20h 09m
1 stop
SEA9:04 pmSeattle/Tacoma Intl
$787

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 April 30, 2026.
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

Cheapest round-trip

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 9/29

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Fri 10/9

1:50 pm-8:40 pm

1 stop15h 50m

$647
Quickest round-trip

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Sun 10/18

3:40 pm-12:55 pm

1 stop12h 15m

Brussels Bruxelles-National

Thu 10/29

12:50 pm-6:00 pm

1 stop13h 10m

$648

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 10/5

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Thu 10/15

1:50 pm-5:55 pm

1 stop13h 05m

$650

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Thu 10/1

3:40 pm-12:55 pm

1 stop12h 15m

Brussels Bruxelles-National

Fri 10/16

1:50 pm-8:40 pm

1 stop15h 50m

$652

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Fri 10/2

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Fri 10/16

1:50 pm-5:55 pm

1 stop13h 05m

$654

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 9/2

11:25 pm-12:55 pm

1 stop28h 30m

Brussels Bruxelles-National

Fri 9/11

1:50 pm-8:40 pm

1 stop15h 50m

$658

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 9/2

7:00 pm-12:55 pm

1 stop32h 55m

Brussels Bruxelles-National

Fri 9/11

1:50 pm-5:55 pm

1 stop13h 05m

$659

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 9/2

11:25 pm-12:55 pm

1 stop28h 30m

Brussels Bruxelles-National

Fri 9/11

1:50 pm-8:40 pm

1 stop15h 50m

$660

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Fri 6/5

10:30 am-10:45 pm

2 stops27h 15m

Charleroi Brussels

Wed 6/10

9:20 am-10:05 am

3 stops33h 45m

$935

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

Tue 8/25

3:40 pm-9:15 pm

2 stops20h 35m

Charleroi Brussels

Wed 9/9

9:20 am-6:45 pm

3 stops42h 25m

$951

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, August 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 $219. If you are unable to visit Brussels during the month of August, then departing from Seattle during the month January is also very affordable. Most momondo users find prices during this month for around $375.

How far in advance should I book a flight from Seattle 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 $615 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 $503 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

Frequently asked questions about flying from Seattle to Brussels

  • 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 $382Free CancellationRating
7.0
646 reviews
Search Icelandair flights
British AirwaysPriceFrom $421Free CancellationRating
6.7
7,937 reviews
Search British Airways flights
United AirlinesPriceFrom $470Free CancellationRating
7.4
9,677 reviews
Search United Airlines flights
KLMPriceFrom $481Free CancellationRating
7.8
1,512 reviews
Search KLM flights
DeltaPriceFrom $482Free CancellationRating
7.9
8,464 reviews
Search Delta flights
Virgin AtlanticPriceFrom $488Free CancellationRating
7.4
688 reviews
Search Virgin Atlantic flights
LufthansaPriceFrom $494Free CancellationRating
6.8
7,962 reviews
Search Lufthansa flights
Air CanadaPriceFrom $518Free CancellationRating
7.1
10,982 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