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$380+ Cheap flights from St. Louis (STL) to Belgium

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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BRU
Nov 15 — Nov 221
Sat 11/15
Sat 11/22
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 October 16, 2025.

Round-trip from

$530
(United Airlines)

One-way from

$380
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$873
From Lambert-St Louis to Belgium
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One-way flight from Lambert-St Louis to Belgium
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Highest demand for flights based on searches. 18% potential increase in price ($208 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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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 October 16, 2025.

This United Airlines deal was found by Cheapflights users on 10/14. 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 11/121:10 pmSTL - BRU
2 stops17h 05mUnited Airlines
Thu 11/2710:00 amBRU - STL
2 stops35h 24mUnited Airlines
Deal found 10/14$530
This Air Canada deal was found by Cheapflights users on 10/15. 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.
Wed 11/124:05 pmSTL - BRU
2 stops14h 10mAir Canada
Thu 11/2710:00 amBRU - STL
2 stops35h 24mAir Canada
Deal found 10/15$532
This United Airlines deal was found by Cheapflights users on 10/15. 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.
Sat 11/2911:05 amSTL - BRU
2 stops19h 10mUnited Airlines
Sat 12/611:15 amBRU - STL
1 stop13h 14mUnited Airlines
Deal found 10/15$553
This deal was found by Cheapflights users on 10/16. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1311:49 amSTL - BRU
1 stop13h 16mUnited Airlines
Wed 11/1910:10 amBRU - STL
1 stop12h 39mUnited Airlines
Deal found 10/16$556
This United Airlines deal was found by Cheapflights users on 10/15. 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.
Mon 12/153:19 pmSTL - BRU
2 stops14h 56mUnited Airlines
Thu 12/2510:00 amBRU - STL
2 stops38h 54mUnited Airlines
Deal found 10/15$625
This United Airlines deal was found by Cheapflights users on 10/14. 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 12/104:05 pmSTL - BRU
2 stops14h 10mUnited Airlines
Mon 2/910:10 amBRU - STL
1 stop18h 03mUnited Airlines
Deal found 10/14$630
This FlightHub deal was found by Cheapflights users on 10/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/123:50 pmSTL - BRU
1 stop11h 20mLufthansa
Thu 11/277:30 pmBRU - STL
1 stop25h 25mLufthansa
Deal found 10/15$694

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 October 16, 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

Sat 11/29

11:05 am-1:15 pm

2 stops19h 10m

Brussels Bruxelles-National

Sat 12/6

10:00 am-3:40 pm

2 stops36h 40m

$530

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 11/12

1:10 pm-1:15 pm

2 stops17h 05m

Brussels Bruxelles-National

Thu 11/27

10:00 am-2:24 pm

2 stops35h 24m

$530

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 12/10

4:05 pm-1:15 pm

2 stops14h 10m

Brussels Bruxelles-National

Mon 2/9

10:00 am-12:29 pm

2 stops33h 29m

$532

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 12/10

4:05 pm-1:15 pm

2 stops14h 10m

Brussels Bruxelles-National

Mon 2/9

10:00 am-12:29 pm

2 stops33h 29m

$532

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 11/12

4:05 pm-1:15 pm

2 stops14h 10m

Brussels Bruxelles-National

Thu 11/27

10:00 am-2:24 pm

2 stops35h 24m

$532

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-5:54 pm

2 stops38h 54m

$625

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sat 11/15

7:45 pm-11:50 pm

3 stops45h 05m

$380

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 11/10

10:25 am-5:05 pm

3 stops47h 40m

$424

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sat 11/15

10:00 am-8:55 am

1 stop15h 55m

$443

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 11/10

1:10 pm-7:15 am

1 stop11h 05m

$475

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/14

Showing 1-10 of 11 results
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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, February is the cheapest month in which you can book a flight from St. Louis to Belgium (average of $615). Flying from St. Louis to Belgium 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 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 October 16, 2025.

When flying from St. Louis to Belgium, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 33% versus a flight in the evening.

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 October 16, 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
8,982 reviews

Entertainment

7.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,982 reviews
United Airlines
7.4
Good
8,982 reviews

Entertainment

7.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

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 10m. Fly via United Airlines or Air Canada to get the fastest option. St. Louis and Belgium are separated by a distance of 4393 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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Alternative routes for St. Louis to Belgium

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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 October 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$654Average$842FlexibilityNo cancel feeOn-time69%

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