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$534+ Cheap flights from St. Louis (STL) to Belgium

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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BRU
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from St. Louis to Belgium

Keep the following information in mind while searching for St. Louis to Belgium flight deals. Data was last updated September 15, 2025.

Round-trip from

$534
(United Airlines)

Popular in

June

Cheapest in

February

Average price

$785
From Lambert-St Louis to Belgium
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($222 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from St. Louis to Belgium

Cheapest flights from St. Louis to Belgium
Explore the most affordable flight options available from St. Louis to Belgium. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1211:05 amSTL - BRU
1 stop14h 50mUnited Airlines
Thu 11/2710:00 amBRU - STL
2 stops35h 25mUnited Airlines
Deal found 9/15$534
This SmartFares deal was found by Cheapflights users on 9/14. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/293:59 pmSTL - BRU
2 stops16h 31mScandinavian Airlines
Wed 11/53:10 pmBRU - STL
2 stops37h 28mScandinavian Airlines
Deal found 9/14$537
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/298:25 amSTL - BRU
1 stop16h 50mUnited Airlines
Wed 11/510:10 amBRU - STL
1 stop19h 35mUnited Airlines
Deal found 9/14$556
This United Airlines deal was found by Cheapflights users on 9/13. 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
1 stop10h 36mUnited Airlines
Thu 12/2510:00 amBRU - STL
2 stops35h 26mUnited Airlines
Deal found 9/13$579
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:31 pmSTL - BRU
1 stop13h 24mUnited Airlines
Thu 11/1310:00 amBRU - STL
2 stops35h 25mUnited Airlines
Deal found 9/15$584
This United Airlines deal was found by Cheapflights users on 9/13. 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 10/141:30 pmSTL - BRU
1 stop11h 35mUnited Airlines
Wed 10/2910:10 amBRU - STL
1 stop15h 29mUnited Airlines
Deal found 9/13$594
This Air Canada deal was found by Cheapflights users on 9/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/141:30 pmSTL - BRU
2 stops13h 15mMultiple Airlines
Wed 10/2910:00 amBRU - STL
2 stops35h 29mMultiple Airlines
Deal found 9/15$599
This Air Canada deal was found by Cheapflights users on 9/14. 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.
Tue 10/149:15 amSTL - BRU
2 stops15h 50mAir Canada
Wed 10/2910:00 amBRU - STL
2 stops35h 29mAir Canada
Deal found 9/14$602
This Air Canada deal was found by Cheapflights users on 9/14. 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 12/155:27 pmSTL - BRU
2 stops31h 23mAir Canada
Thu 12/2510:00 amBRU - STL
2 stops36h 29mAir Canada
Deal found 9/14$609

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Belgium 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 September 15, 2025.
Use the filters below to find and compare flights from St. Louis to Belgium that are best for you.

Fly from

St. Louis

Fly to

Belgium

Route

Depart

Return

Price

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 11/12

11:05 am-8:55 am

1 stop14h 50m

Brussels Bruxelles-National

Thu 11/27

10:00 am-5:39 pm

2 stops38h 39m

$534

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 10/29

8:25 am-7:15 am

1 stop16h 50m

Brussels Bruxelles-National

Wed 11/5

10:10 am-10:45 pm

1 stop19h 35m

$556

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 10/28

10:00 am-7:50 am

2 stops15h 50m

Brussels Bruxelles-National

Tue 11/4

10:10 am-9:40 pm

1 stop18h 30m

$556

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Thu 11/6

12:31 pm-8:55 am

1 stop13h 24m

Brussels Bruxelles-National

Thu 11/13

10:00 am-2:25 pm

2 stops35h 25m

$584

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 10/14

1:30 pm-8:05 am

1 stop11h 35m

Brussels Bruxelles-National

Wed 10/29

10:00 am-12:28 pm

2 stops32h 28m

$594

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Best time to book a flight from St. Louis to Belgium

Have a flexible travel schedule? Discover the best time to fly to Belgium 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 Belgium

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

Currently, November is the cheapest month in which you can book a flight from St. Louis to Belgium (average of $614). Flying from St. Louis to Belgium in June is currently the most expensive (average of $1,077). 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 BE?

Find hourly flight availability from St. Louis to Belgium. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

When flying from St. Louis to Belgium, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Belgium

Get insights into the airlines that provide service to Belgium. 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 Belgium. Reviews last updated September 15, 2025.
Read reviews from past customers who have flown United Airlines from St. Louis to Belgium. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,929 reviews

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Crew

8.1

Overall

7.4

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

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

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to Belgium from St. Louis.

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

    There are many flights that can get you from St. Louis to Belgium in 14h 50m. Fly via United Airlines to get the fastest option. St. Louis and Belgium are separated by a distance of 4393 mi.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Belgium (average of $614). Flying from St. Louis to Belgium in June is currently the most expensive (average of $1,077). 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

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Top airline flying from St. Louis to Belgium

Discover the top airline that operate flights from St. Louis to Belgium. 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$656Average$832FlexibilityNo cancel feeOn-time69%

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