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$271+ Cheap flights from St. Louis (STL) 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BRU
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
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Cheap flight deals from St. Louis to Brussels

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) 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 January 8, 2026.

Round-trip from

$439
(United Airlines)

One-way from

$271
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$659
From Lambert-St Louis to Brussels
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One-way flight from Lambert-St Louis to Brussels
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Highest demand for flights based on searches. 24% potential increase in price ($302 potential increase over avg. RT price).
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Cheapest flight prices on average. 13% potential price decrease ($115 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from St. Louis to Brussels

Cheapest flights from St. Louis to Brussels
Explore the most affordable flight options available from St. Louis to Brussels. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 8, 2026.

This United Airlines deal was found by Cheapflights users on 1/8. 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 3/188:30 amSTL - BRU
1 stop16h 45mUnited Airlines
Wed 3/2510:00 amBRU - STL
2 stops34h 42mUnited Airlines
Deal found 1/8$439
This Cheapflightsfares deal was found by Cheapflights users on 1/7. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/2011:22 amSTL - BRU
1 stop13h 43mLufthansa
Tue 1/2711:15 amBRU - STL
1 stop19h 44mLufthansa
Deal found 1/7$443
This Booking.com deal was found by Cheapflights users on 1/6. 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 2/36:40 pmSTL - BRU
2 stops30h 10mAir Canada
Tue 2/1010:00 amBRU - STL
2 stops19h 58mAir Canada
Deal found 1/6$457
This United Airlines deal was found by Cheapflights users on 1/6. 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.
Tue 2/311:20 amSTL - BRU
1 stop14h 35mUnited Airlines
Tue 2/1010:10 amBRU - STL
1 stop19h 48mUnited Airlines
Deal found 1/6$459
This United Airlines deal was found by Cheapflights users on 1/7. 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.
Tue 1/209:57 amSTL - BRU
2 stops15h 08mUnited Airlines
Tue 1/2711:15 amBRU - STL
1 stop13h 03mUnited Airlines
Deal found 1/7$463
This United Airlines deal was found by Cheapflights users on 1/6. 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 1/218:30 amSTL - BRU
1 stop15h 45mUnited Airlines
Wed 2/1811:55 amBRU - STL
1 stop29h 18mUnited Airlines
Deal found 1/6$465
This FlightHub deal was found by Cheapflights users on 1/6. 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.
Sat 1/244:05 pmSTL - BRU
2 stops32h 45mAir Canada
Tue 2/1710:00 amBRU - STL
2 stops36h 29mAir Canada
Deal found 1/6$467
This FlightHub deal was found by Cheapflights users on 1/6. 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.
Sat 1/244:05 pmSTL - BRU
2 stops32h 45mAir Canada
Wed 2/1810:00 amBRU - STL
2 stops18h 05mAir Canada
Deal found 1/6$469
This KAYAK deal was found by Cheapflights users on 1/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/2512:01 pmSTL - BRU
2 stops21h 39mBritish Airways
Tue 2/1712:00 pmBRU - STL
2 stops32h 43mBritish Airways
Deal found 1/6$471
This United Airlines deal was found by Cheapflights users on 1/6. 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.
Sun 1/256:30 amSTL - BRU
1 stop19h 25mUnited Airlines
Wed 2/1810:10 amBRU - STL
1 stop31h 26mUnited Airlines
Deal found 1/6$484

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis 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 January 8, 2026.
Use the filters below to find and compare flights from St. Louis to Brussels that are best for you.

Fly from

St. Louis

Fly to

Brussels

Route

Depart

Return

Price

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

8:30 am-7:15 am

1 stop16h 45m

Brussels Bruxelles-National

Wed 3/25

10:00 am-2:42 pm

2 stops34h 42m

$439

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 2/4

11:20 am-8:55 am

1 stop14h 35m

Brussels Bruxelles-National

Wed 2/11

10:10 am-10:58 pm

1 stop19h 48m

$459

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 2/3

11:20 am-8:55 am

1 stop14h 35m

Brussels Bruxelles-National

Tue 2/10

10:10 am-10:58 pm

1 stop19h 48m

$459

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 1/20

9:57 am-8:05 am

2 stops15h 08m

Brussels Bruxelles-National

Tue 1/27

11:15 am-5:18 pm

1 stop13h 03m

$463

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Fri 3/20

6:04 am-8:00 am

1 stop19h 56m

Brussels Bruxelles-National

Thu 3/26

10:00 am-3:13 pm

1 stop35h 13m

$484

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sat 1/24

4:49 pm-8:55 am

1 stop33h 06m

Brussels Bruxelles-National

Tue 2/17

10:00 am-9:05 pm

2 stops18h 05m

$493

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sat 2/21

4:05 pm-7:50 am

2 stops32h 45m

Brussels Bruxelles-National

Sat 2/28

5:30 pm-1:55 pm

1 stop27h 25m

$495

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sat 2/21

9:55 am-1:15 pm

2 stops20h 20m

Brussels Bruxelles-National

Sat 2/28

11:15 am-5:00 pm

1 stop12h 45m

$505

St. LouisBrussels

STL - CRL

STLCRL

Lambert-St Louis

Sat 1/24

12:12 pm-8:05 pm

3 stops48h 53m

$271

St. LouisBrussels

STL - CRL

STLCRL

Lambert-St Louis

Mon 2/9

10:16 am-7:15 pm

3 stops49h 59m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 25 results
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Best time to book a flight from St. Louis to Brussels

Have a flexible travel schedule? Discover the best time to fly to Brussels from St. Louis 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 St. Louis to Brussels

What is the cheapest month to book a flight from St. Louis to Brussels?

Currently, April is the cheapest month in which you can book a flight from St. Louis to Brussels (average of $443). Flying from St. Louis to Brussels in June is currently the most expensive (average of $1,008). 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 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 January 8, 2026.
Read through reviews of airlines operating flights from St. Louis to Brussels, such as United Airlines and Lufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,139 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
United Airlines
7.4
Good
9,139 reviews
United Airlines
7.4
Good
9,139 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
Lufthansa
6.8
Okay
7,692 reviews
United Airlines
7.4
Good
9,139 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

Related info for your journey

Find useful and relevant information for your journey from St. Louis 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 St. Louis to Brussels?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Brussels. On average, Lambert-St Louis has 0 outbound flights to Brussels per day from 2 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from St. Louis to Brussels?

    United Airlines can get you from St. Louis to Brussels in just under 16h 45m. Your travel time can differ by up to . The distance between St. Louis and Brussels is about 4393 mi.

  • What are the cheapest airlines flying from St. Louis to Brussels round-trip?

    Currently priced at $441, Lufthansa will fly you from St. Louis to Brussels and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $628. These flights start at 52% lower than the current average price 3 months from now.

  • Can I find deals for flights from St. Louis to Brussels that include hotel bookings?

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

  • How can I find direct flights from St. Louis to Brussels?

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

  • Can I find deals for business class flights from St. Louis to Brussels?

    Yes. Cheapflights offers flight deals from St. Louis 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 St. Louis to Brussels?

    Currently, April is the cheapest month in which you can book a flight from St. Louis to Brussels (average of $443). Flying from St. Louis to Brussels in June is currently the most expensive (average of $1,008). 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 St. Louis to Brussels

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Bruxelles-National flights
Kansas City to Bruxelles-National flights
Springfield to Bruxelles-National flights
St. Louis to Charleroi Brussels flights

Top 2 airlines flying from St. Louis to Brussels

Discover the top 2 airlines that operate flights from St. Louis 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 January 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$441Average$2,205FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$628Average$778FlexibilityNo cancel feeOn-time69%

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