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$256+ 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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BRU
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Brussels are usually found in February or November, booked 69 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 April 17, 2025.

Round-trip from

$469
(Flightnetwork)

One-way from

$256
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$633
From Seattle/Tacoma Intl to Brussels
Search Deals
One-way flight from Seattle/Tacoma Intl to Brussels
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Highest demand for flights based on searches. 18% potential increase in price ($143 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This Flightnetwork deal was found by Cheapflights users on 4/16. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/113:45 pmSEA - BRU
1 stop12h 05mIcelandair
Mon 5/191:50 pmBRU - SEA
1 stop13h 00mIcelandair
Deal found 4/16$469
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Mon 11/245:45 amSEA - BRU
2 stops17h 10mAir Canada
Tue 12/210:00 amBRU - SEA
2 stops32h 50mAir Canada
Deal found 4/16$499
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Wed 11/55:07 amSEA - BRU
2 stops17h 48mUnited Airlines
Thu 11/1310:00 amBRU - SEA
2 stops41h 09mUnited Airlines
Deal found 4/16$522
This Booking.com deal was found by Cheapflights users on 4/16. 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.
Tue 9/212:20 pmSEA - BRU
1 stop34h 30mBrussels Airlines
Tue 9/239:40 amBRU - SEA
1 stop34h 34mBrussels Airlines
Deal found 4/16$538
This FlightHub deal was found by Cheapflights users on 4/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/242:00 pmSEA - BRU
1 stop13h 35mLufthansa
Tue 12/210:00 amBRU - SEA
2 stops37h 30mLufthansa
Deal found 4/16$554
This United deal was found by Cheapflights users on 4/16. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/56:30 amSEA - BRU
3 stops41h 25mMultiple Airlines
Thu 11/1310:30 amBRU - SEA
2 stops20h 20mMultiple Airlines
Deal found 4/16$573
This Delta deal was found by Cheapflights users on 4/16. 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.
Wed 7/302:05 pmSEA - BRU
1 stop15h 30mDelta
Mon 8/253:05 pmBRU - SEA
1 stop29h 30mDelta
Deal found 4/16$578
This SWISS deal was found by Cheapflights users on 4/17. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/84:25 pmSEA - BRU
1 stop17h 50mSWISS
Mon 12/158:10 pmBRU - SEA
2 stops33h 44mSWISS
Deal found 4/17$579
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/229:44 amSEA - BRU
2 stops19h 36mAmerican Airlines
Mon 9/293:00 pmBRU - SEA
1 stop29h 10mAmerican Airlines
Deal found 4/16$583
This British Airways deal was found by Cheapflights users on 4/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/48:20 pmSEA - BRU
1 stop33h 05mBritish Airways
Mon 8/2510:40 amBRU - SEA
1 stop33h 30mBritish Airways
Deal found 4/16$589
This Scandinavian Airlines deal was found by Cheapflights users on 4/17. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/254:00 pmSEA - BRU
1 stop17h 30mScandinavian Airlines
Sat 8/307:10 pmBRU - SEA
1 stop27h 40mScandinavian Airlines
Deal found 4/17$646
This Austrian Airlines deal was found by Cheapflights users on 4/17. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/197:00 amSEA - BRU
2 stops27h 10mAustrian Airlines
Sat 8/309:50 amBRU - SEA
2 stops41h 59mAustrian Airlines
Deal found 4/17$690

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 April 17, 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

Sun 5/11

3:45 pm-12:50 pm

1 stop12h 05m

Brussels Bruxelles-National

Mon 5/19

1:50 pm-5:50 pm

1 stop13h 00m

$469

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 8/4

10:00 am-8:00 am

2 stops37h 00m

Brussels Bruxelles-National

Thu 8/21

10:00 am-10:16 pm

2 stops45h 16m

$530

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 9/2

12:20 pm-7:50 am

1 stop34h 30m

Brussels Bruxelles-National

Tue 9/23

9:40 am-11:14 am

1 stop34h 34m

$538

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Tue 9/9

7:20 am-8:05 am

1 stop15h 45m

Brussels Bruxelles-National

Wed 12/10

10:10 am-10:29 pm

1 stop21h 19m

$540

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 7/30

2:20 pm-7:50 pm

2 stops20h 30m

Brussels Bruxelles-National

Thu 8/21

10:00 am-2:16 pm

2 stops37h 16m

$577

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 7/30

2:05 pm-2:35 pm

1 stop15h 30m

Brussels Bruxelles-National

Mon 8/25

3:05 pm-11:35 am

1 stop29h 30m

$578

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 9/8

4:25 pm-7:15 pm

1 stop17h 50m

Brussels Bruxelles-National

Mon 12/15

8:10 pm-8:54 pm

2 stops33h 44m

$579

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 9/22

9:44 am-2:20 pm

2 stops19h 36m

Brussels Bruxelles-National

Mon 9/29

3:00 pm-11:10 am

1 stop29h 10m

$583

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Wed 5/14

11:30 am-1:15 pm

2 stops16h 45m

Brussels Bruxelles-National

Wed 5/21

10:00 am-7:37 pm

1 stop18h 37m

$585

SeattleBrussels

SEA - BRU

SEABRU

Seattle/Tacoma Intl

Mon 8/4

8:20 pm-2:25 pm

1 stop33h 05m

Brussels Bruxelles-National

Mon 8/25

10:40 am-11:10 am

1 stop33h 30m

$589

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

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 April 11, 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 69 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 $1,146). 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 April 17, 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 May 12, 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.

Rainfall in Brussels by month

Plan your trip to Brussels by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Brussels ranges from 1.6 - 3.1 inches per month. January is typically the wettest month, when rainfall can reach 3.1 in. August is typically the driest time to visit Brussels when rainfall is around 1.6 in.

Temperature in Brussels by month

Plan your trip to Brussels by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Brussels, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 37.4 F).

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 April 17, 2025.
Read reviews from past customers who have flown Delta, KLM and Austrian Airlines from Seattle to Brussels. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,916 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,916 reviews
Delta
8.0
Very good
7,916 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,327 reviews
Delta
8.0
Very good
7,916 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
775 reviews
Delta
8.0
Very good
7,916 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,580 reviews
Delta
8.0
Very good
7,916 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,667 reviews
Delta
8.0
Very good
7,916 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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?

    Icelandair, at $469, was found to be the cheapest airline from Seattle to Brussels.Alternate airlines to your destination round-trip include Virgin Atlantic and Air Canada. Users have found that Icelandair is 27% 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 $256. However, be on the lookout for offers from KLM 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 $1,146). 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.
Seattle to Bruxelles-National flights
Portland 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$403Average$538FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$495Average$659FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$501Average$589FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$529Average$656FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$532Average$544FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$532Average$684FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$543Average$724FlexibilityNo cancel feeOn-time67%
DeltaCheapest$549Average$769FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$554Average$768FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$580Average$745FlexibilityNo cancel feeOn-time76%

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