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$311+ Cheap flights from Seattle (SEA) to Brussels

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
ago. 4 — ago. 111
lun. 8/4
lun. 8/11
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Brussels are usually found in September or November, booked 81 days in advance, depart on a Tuesday or Monday and return on a Sunday

Cheap flight deals from Seattle to Brussels

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Brussels (BR1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated julio 30, 2025.

Round-trip from

$456
(Air Canada)

One-way from

$311
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$743
From Seattle/Tacoma Intl to Brussels
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One-way flight from Seattle/Tacoma Intl to Brussels
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Highest demand for flights based on searches. 15% potential increase in price ($116 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Seattle to Brussels

Cheapest flights from Seattle to Brussels
Explore the most affordable flight options available from Seattle to Brussels. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 30, 2025.

This Air Canada deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/912:05 pmSEA - BRU
1 stop34h 45mAir Canada
jue. 8/219:40 amBRU - SEA
1 stop34h 20mAir Canada
Deal found 7/28$456
This Icelandair deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/213:45 pmSEA - BRU
1 stop12h 05mIcelandair
mar. 9/21:50 pmBRU - SEA
1 stop13h 00mIcelandair
Deal found 7/28$457
This KLM deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/177:20 amSEA - BRU
1 stop16h 40mKLM
jue. 12/411:00 amBRU - SEA
1 stop17h 29mKLM
Deal found 7/28$458
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/105:55 pmSEA - BRU
2 stops29h 45mDelta
jue. 8/2110:45 amBRU - SEA
1 stop18h 29mDelta
Deal found 7/28$462
This Ovago deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/1910:53 amSEA - BRU
1 stop13h 02mLufthansa
mié. 12/310:00 amBRU - SEA
2 stops18h 16mLufthansa
Deal found 7/28$466
This Ovago deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/196:50 pmSEA - BRU
1 stop12h 30mBritish Airways
mié. 12/311:50 amBRU - SEA
1 stop14h 05mBritish Airways
Deal found 7/30$469
This Booking.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/257:15 pmSEA - BRU
2 stops27h 45mMultiple Airlines
mar. 9/210:00 amBRU - SEA
2 stops45h 16mMultiple Airlines
Deal found 7/28$473
This Virgin Atlantic deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/265:30 amSEA - BRU
2 stops18h 10mVirgin Atlantic
mar. 9/210:45 amBRU - SEA
2 stops20h 29mVirgin Atlantic
Deal found 7/30$480
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/247:20 amSEA - BRU
1 stop15h 40mUnited Airlines
mié. 9/310:00 amBRU - SEA
3 stops21h 52mUnited Airlines
Deal found 7/28$483
This Mytrip deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/117:35 pmSEA - CRL
2 stops18h 20mMultiple Airlines
mié. 8/276:35 amCRL - SEA
2 stops20h 15mMultiple Airlines
Deal found 7/28$747

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated julio 30, 2025.
Use the filters below to find and compare flights from Seattle to Brussels that are best for you.

Fly from

Seattle

Fly to

Brussels

Route

Depart

Return

Price

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

sáb. 8/9

12:05 pm-7:50 am

1 stop34h 45m

Brussels Bruxelles-National

jue. 8/21

9:40 am-11:00 am

1 stop34h 20m

$456

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

jue. 8/21

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

jue. 9/4

1:50 pm-5:50 pm

1 stop13h 00m

$457

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

lun. 11/17

7:20 am-9:00 am

1 stop16h 40m

Brussels Bruxelles-National

jue. 12/4

11:00 am-7:29 pm

1 stop17h 29m

$458

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

dom. 8/10

5:55 pm-8:40 am

2 stops29h 45m

Brussels Bruxelles-National

jue. 8/21

10:45 am-11:59 pm

2 stops22h 14m

$462

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

mié. 11/19

10:53 am-8:55 am

1 stop13h 02m

Brussels Bruxelles-National

mié. 12/3

10:00 am-7:16 pm

2 stops18h 16m

$466

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

mié. 11/19

6:50 pm-4:20 pm

1 stop12h 30m

Brussels Bruxelles-National

mié. 12/3

11:50 am-4:55 pm

1 stop14h 05m

$469

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

lun. 8/25

7:15 pm-8:00 am

2 stops27h 45m

Brussels Bruxelles-National

mar. 9/2

10:00 am-10:16 pm

2 stops45h 16m

$473

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

mar. 8/26

5:30 am-8:40 am

2 stops18h 10m

Brussels Bruxelles-National

mar. 9/2

10:45 am-10:14 pm

2 stops20h 29m

$480

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

dom. 8/24

7:20 am-8:00 am

1 stop15h 40m

Brussels Bruxelles-National

mié. 9/3

10:00 am-10:52 pm

3 stops21h 52m

$483

SeattleBrussels

SEA - CRL

SEACRL

Seattle/Tacoma Intl

lun. 8/11

7:35 pm-10:55 pm

2 stops18h 20m

Charleroi Brussels

mié. 8/27

6:35 am-5:50 pm

2 stops20h 15m

$747

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 21 results
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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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Brussels. Price data was last updated on July 25, 2025.

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 81 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, November is the cheapest month in which you can book a flight from Seattle to Brussels (average of $614). Flying from Seattle to Brussels in June is currently the most expensive (average of $1,081). 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.

What is the cheapest time of day to fly from SEA to BRU?

Find hourly flight availability from Seattle to Brussels. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 30, 2025.

It’s optimal to fly from Seattle to Brussels in the morning. By choosing this option you can save up to 10% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Seattle to Brussels?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Brussels. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Brussels flight should consider departing on Sunday evenings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Brussels

Get insights into the airlines that provide service to Brussels. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Brussels. Reviews last updated julio 30, 2025.
Get a feel of what it's like to fly with Delta, KLM, and United 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.
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Brussels Airlines
7.3
Good
350 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Seattle to Brussels. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 11 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?

    Air Canada, at $456, was found to be the cheapest airline from Seattle to Brussels.Alternate airlines to your destination round-trip include Icelandair and KLM. Users have found that Air Canada is 26% 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 TAP AIR PORTUGAL, with whom users have recently found tickets for as low as $320. However, be on the lookout for offers from Icelandair and Delta, 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, November is the cheapest month in which you can book a flight from Seattle to Brussels (average of $614). Flying from Seattle to Brussels in June is currently the most expensive (average of $1,081). 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

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Alternative routes for Seattle to Brussels

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Bruxelles-National flights
Seattle to Bruxelles-National flights
Seattle to Charleroi Brussels flights
Portland to Charleroi Brussels flights
Portland to Antwerp flights

Top 10 airlines flying from Seattle to Brussels

Discover the top 10 airlines that operate flights from Seattle to Brussels. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$389Average$496FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$501Average$620FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$502Average$691FlexibilityNo cancel feeOn-time70%
KLMCheapest$511Average$709FlexibilityNo cancel feeOn-time75%
DeltaCheapest$514Average$717FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$522Average$675FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$532Average$538FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$543Average$740FlexibilityNo cancel feeOn-time67%
Air FranceCheapest$547Average$665FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$570Average$736FlexibilityNo cancel feeOn-time76%

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