HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Brussels

Cheap flights from Seattle (SEA) to Brussels

SEA — BRU
Nov 19 — Nov 261
Thu 11/19
Thu 11/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Brussels with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Find flight deals from Seattle to Brussels

Popular in

June

Cheapest in

February

Average price

$677
Highest demand for flights based on searches. 17% potential increase in price ($167 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($47 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2026
Search Deals

Best time to book a flight from Seattle to Brussels

Have a flexible travel schedule? Discover the best time to fly to Brussels from Seattle with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Seattle to Brussels

How far ahead should I book a flight from Seattle to Brussels?

The price you pay for your flight from Seattle to Brussels may vary depending on when you book. For the best chance of a lower fare, look to book 70 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Brussels?

Currently, February is the cheapest month in which you can book a flight from Seattle to Brussels (average of $510). Flying from Seattle to Brussels in June is currently the most expensive (average of $1,284). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Brussels

Get a feel of what it's like to fly with KLM,Delta, andUnited Airlines from Seattle to Brussels by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,591 reviews

Overall

7.8

Entertainment

7.2

Boarding

7.8

Crew

8.4

Comfort

7.7

Food

7.4

Reviews

1 / 20
4.0
Okay

Abhisek,Aug 2026

JFK - AMS

They didn’t offer any options for breakfast and had only one option which was cold meat and cheese. I would expect at least one more option in premium economy
KLM
7.8
Good
1,591 reviews
KLM
7.8
Good
1,591 reviews

Overall

7.8

Entertainment

7.2

Boarding

7.8

Crew

8.4

Comfort

7.7

Food

7.4

Reviews

1 / 20
4.0
Okay

Abhisek,Aug 2026

JFK - AMS

They didn’t offer any options for breakfast and had only one option which was cold meat and cheese. I would expect at least one more option in premium economy
Delta
7.8
Good
8,652 reviews
KLM
7.8
Good
1,591 reviews

Overall

7.8

Entertainment

7.2

Boarding

7.8

Crew

8.4

Comfort

7.7

Food

7.4

Reviews

1 / 20
4.0
Okay

Abhisek,Aug 2026

JFK - AMS

They didn’t offer any options for breakfast and had only one option which was cold meat and cheese. I would expect at least one more option in premium economy
United Airlines
7.3
Good
10,388 reviews
KLM
7.8
Good
1,591 reviews

Overall

7.8

Entertainment

7.2

Boarding

7.8

Crew

8.4

Comfort

7.7

Food

7.4

Reviews

1 / 20
4.0
Okay

Abhisek,Aug 2026

JFK - AMS

They didn’t offer any options for breakfast and had only one option which was cold meat and cheese. I would expect at least one more option in premium economy
Icelandair
6.9
Okay
761 reviews
KLM
7.8
Good
1,591 reviews

Overall

7.8

Entertainment

7.2

Boarding

7.8

Crew

8.4

Comfort

7.7

Food

7.4

Reviews

1 / 20
4.0
Okay

Abhisek,Aug 2026

JFK - AMS

They didn’t offer any options for breakfast and had only one option which was cold meat and cheese. I would expect at least one more option in premium economy
Lufthansa
6.8
Okay
8,281 reviews
KLM
7.8
Good
1,591 reviews

Overall

7.8

Entertainment

7.2

Boarding

7.8

Crew

8.4

Comfort

7.7

Food

7.4

Reviews

1 / 20
4.0
Okay

Abhisek,Aug 2026

JFK - AMS

They didn’t offer any options for breakfast and had only one option which was cold meat and cheese. I would expect at least one more option in premium economy

Related info for your journey

  • What airport do you fly from for flights from Seattle to Brussels?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Brussels. On average, Seattle/Tacoma Intl has 0 outbound flights to Brussels per day from 6 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • What are the cheapest airlines flying from Seattle to Brussels round-trip?

    Icelandair, at $393, was found to be the cheapest airline from Seattle to Brussels.Alternate airlines to your destination round-trip include British Airways and KLM. Users have found that Icelandair is 48% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Brussels one-way?

    The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as $237. However, be on the lookout for offers from United Airlines and KLM, as they are both options that can get you from Seattle to Brussels for a low price.

  • Can I find deals for flights from Seattle to Brussels that include hotel bookings?

    Yes. In addition to deals on Seattle to Brussels flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Brussels?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Brussels.

  • Can I find deals for business class flights from Seattle to Brussels?

    Yes. Cheapflights offers flight deals from Seattle to Brussels by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Brussels?

    Currently, February is the cheapest month in which you can book a flight from Seattle to Brussels (average of $510). Flying from Seattle to Brussels in June is currently the most expensive (average of $1,284). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Seattle to Brussels

Seattle to Bruxelles-National flights
Portland to Bruxelles-National flights
Portland to Antwerp flights

Top 6 airlines flying from Seattle to Brussels

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$384Average$559FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$421Average$686FlexibilityNo cancel feeOn-time70%
KLMCheapest$481Average$680FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$496Average$782FlexibilityNo cancel feeOn-time76%
DeltaCheapest$509Average$759FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$522Average$847FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2026 Cheapflights