$238 Find Cheap Flights from Seattle to Belgium - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Belgium departing on 10/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Book Cheap Seattle to Belgium Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Belgium that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Belgium

Fri, Jan 22 - Fri, Feb 12
Multiple Airlines Logo
8:21 am - 9:35 am
SEA
-
BRU
16h 14m
2 stops
Multiple Airlines Logo
10:15 am - 7:43 pm
BRU
-
SEA
18h 28m
2 stops
$520Multiple Airlines
Thu, Nov 5 - Fri, Nov 13
Multiple Airlines Logo
8:18 am - 9:35 am
SEA
-
BRU
16h 17m
2 stops
Multiple Airlines Logo
10:15 am - 7:44 pm
BRU
-
SEA
18h 29m
2 stops
$524Multiple Airlines
Sun, Oct 18 - Thu, Oct 22
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
$556Icelandair
Wed, Oct 14 - Mon, Oct 19
Icelandair Logo
3:40 pm - 12:55 pm
SEA
-
BRU
12h 15m
1 stop
Icelandair Logo
1:50 pm - 5:55 pm
BRU
-
SEA
13h 05m
1 stop
$557Icelandair
Tue, Nov 3 - Tue, Nov 10
United Airlines Logo
8:09 am - 1:15 pm
SEA
-
BRU
20h 06m
2 stops
United Airlines Logo
10:00 am - 12:19 pm
BRU
-
SEA
35h 19m
2 stops
$708United Airlines
Tue, Nov 3 - Tue, Nov 10
United Airlines Logo
10:50 am - 1:15 pm
SEA
-
BRU
17h 25m
2 stops
United Airlines Logo
10:00 am - 12:19 pm
BRU
-
SEA
35h 19m
2 stops
$708United Airlines
Sun, Nov 1 - Sun, Nov 15
Lufthansa Logo
2:50 pm - 1:10 pm
SEA
-
BRU
13h 20m
1 stop
Lufthansa Logo
7:00 am - 12:00 pm
BRU
-
SEA
14h 00m
1 stop
$709Lufthansa
Wed, Nov 11 - Wed, Nov 18
Lufthansa Logo
2:50 pm - 1:10 pm
SEA
-
BRU
13h 20m
1 stop
Lufthansa Logo
9:05 am - 1:00 pm
BRU
-
SEA
12h 55m
1 stop
$720Lufthansa
Tue, Nov 3 - Tue, Nov 10
Delta Logo
6:00 am - 11:00 am
SEA
-
BRU
20h 00m
1 stop
Delta Logo
6:10 am - 11:47 am
BRU
-
SEA
14h 37m
1 stop
$724Delta
Tue, Nov 3 - Tue, Nov 10
Delta Logo
6:00 am - 11:00 am
SEA
-
BRU
20h 00m
1 stop
Delta Logo
6:10 am - 11:47 am
BRU
-
SEA
14h 37m
1 stop
$729Delta
Booking Insights

KAYAK's insights & trends for Seattle to Belgium flights

Get data-powered insights and trends into flights from Seattle to Belgium to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Seattle to Belgium?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Belgium, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Belgium is January, when tickets cost $510 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of round-trip tickets is $1,284 and $882 respectively.

How far in advance should I book a flight from Seattle to Belgium?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Belgium, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Belgium, you should book around 2 weeks before departure, which saves you about 21% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Find deals

Good to know

Low season

July

Cheapest flight

$238
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Seattle to Brussels Airport

FAQs - booking Belgium flights

  • How does KAYAK find such low prices on flights from Seattle to Belgium?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Belgium.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Belgium?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to Belgium is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Belgium?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Seattle to Belgium with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Belgium?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to Belgium up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight from Seattle to Belgium

Information on your arrival and departure airports

Seattle (SEA)