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$496+ Cheap flights from St. Louis (STL) to Brussels

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BRU
Dec 17 — Dec 241
Wed 12/17
Wed 12/24
1 adult, Economy
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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 November 17, 2025.

This United Airlines deal was found by Cheapflights users on 11/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/153:19 pmSTL - BRU
2 stops14h 56mUnited Airlines
Thu 12/2510:00 amBRU - STL
2 stops35h 26mUnited Airlines
Deal found 11/17$601
This United Airlines deal was found by Cheapflights users on 11/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:35 pmSTL - BRU
2 stops35h 15mUnited Airlines
Wed 12/174:55 pmBRU - STL
2 stops30h 32mUnited Airlines
Deal found 11/17$732
This United Airlines deal was found by Cheapflights users on 11/16. 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 12/318:05 amSTL - BRU
2 stops22h 10mUnited Airlines
Wed 1/711:15 amBRU - STL
2 stops16h 58mUnited Airlines
Deal found 11/16$750
This Delta deal was found by Cheapflights users on 11/15. 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.
Tue 12/306:29 amSTL - BRU
2 stops24h 46mDelta
Tue 1/611:00 amBRU - STL
2 stops31h 05mDelta
Deal found 11/15$774
This Cheapflightsfares deal was found by Cheapflights users on 11/15. 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.
Mon 12/151:00 pmSTL - BRU
1 stop12h 55mLufthansa
Thu 12/2510:10 amBRU - STL
1 stop18h 33mLufthansa
Deal found 11/15$802
This Ovago deal was found by Cheapflights users on 11/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/196:00 amSTL - BRU
2 stops20h 35mAer Lingus
Wed 11/2610:15 amBRU - STL
2 stops20h 41mAer Lingus
Deal found 11/17$894

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 November 17, 2025.

Round-trip from

$482
(FlightHub)

Popular in

December

Cheapest in

February

Average price

$705
From Lambert-St Louis to Brussels
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($312 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 12% potential price decrease ($111 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 17, 2025.
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

Sun 1/11

4:05 pm-1:15 pm

2 stops38h 10m

Brussels Bruxelles-National

Sun 1/25

7:00 am-1:55 pm

1 stop13h 55m

$496

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Thu 1/29

4:05 pm-1:15 pm

2 stops14h 10m

Brussels Bruxelles-National

Tue 2/3

10:10 am-5:43 pm

1 stop14h 33m

$505

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Fri 2/6

11:20 am-8:55 am

1 stop14h 35m

Brussels Bruxelles-National

Thu 2/12

11:15 am-5:00 pm

1 stop12h 45m

$507

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 12/15

3:19 pm-1:15 pm

2 stops14h 56m

Brussels Bruxelles-National

Thu 12/25

10:00 am-2:26 pm

2 stops35h 26m

$601

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Thu 1/1

11:05 am-1:15 pm

2 stops19h 10m

Brussels Bruxelles-National

Sun 1/11

4:55 pm-2:30 pm

2 stops28h 35m

$721

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 12/31

8:05 am-1:15 pm

2 stops22h 10m

Brussels Bruxelles-National

Wed 1/7

11:15 am-9:13 pm

2 stops16h 58m

$750

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

4:05 pm-1:15 pm

2 stops15h 10m

Brussels Bruxelles-National

Sun 3/29

10:00 am-3:24 pm

2 stops36h 24m

$811

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/17

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, February is the cheapest month in which you can book a flight from St. Louis to Brussels (average of $615). 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.

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

Find hourly flight availability from St. Louis 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 November 17, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 33% on flights from St. Louis to Brussels by exploring options for tickets in the afternoon.

How much does it cost to fly round-trip from St. Louis to Brussels?

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 November 17, 2025.
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
9,015 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,015 reviews
United Airlines
7.4
Good
9,015 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Lufthansa
6.8
Okay
7,576 reviews
United Airlines
7.4
Good
9,015 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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 14h 10m. 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 $654, United Airlines will fly you from St. Louis to Brussels and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Lufthansa for as low as $829. These flights start at 33% 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, February is the cheapest month in which you can book a flight from St. Louis to Brussels (average of $615). 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 November 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$654Average$791FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$829Average$2,205FlexibilityNo cancel feeOn-time76%

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