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$576+ 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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BRU
Dec 5 — Dec 121
Fri 12/5
Fri 12/12
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 November 5, 2025.

Round-trip from

$576
(Delta)

Popular in

December

Cheapest in

February

Average price

$705
From Lambert-St Louis to Belgium
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($295 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 12% potential price decrease ($110 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 5, 2025.

This United Airlines deal was found by Cheapflights users on 11/4. 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 11/123:14 pmSTL - BRU
2 stops15h 01mUnited Airlines
Thu 11/2710:00 amBRU - STL
2 stops40h 16mUnited Airlines
Deal found 11/4$629
This FlightHub deal was found by Cheapflights users on 11/5. 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.
Thu 11/273:15 pmSTL - BRU
2 stops35h 25mScandinavian Airlines
Thu 12/43:10 pmBRU - STL
2 stops39h 32mScandinavian Airlines
Deal found 11/5$644
This United Airlines deal was found by Cheapflights users on 11/5. 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 11/2710:00 amSTL - BRU
1 stop15h 55mUnited Airlines
Thu 12/410:10 amBRU - STL
1 stop13h 53mUnited Airlines
Deal found 11/5$707
This KLM deal was found by Cheapflights users on 11/4. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/154:32 pmSTL - BRU
2 stops14h 43mKLM
Thu 12/2510:45 amBRU - STL
2 stops16h 56mKLM
Deal found 11/4$709
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/2511:55 amBRU - STL
1 stop14h 27mUnited Airlines
Deal found 11/4$733
This Gurufare deal was found by Cheapflights users on 11/4. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/123:50 pmSTL - BRU
1 stop14h 45mLufthansa
Thu 11/275:30 pmBRU - STL
1 stop27h 25mLufthansa
Deal found 11/4$741

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 November 5, 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 4/1

7:30 am-8:40 am

1 stop18h 10m

Brussels Bruxelles-National

Wed 4/8

8:00 am-11:40 pm

2 stops22h 40m

$576

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 4/1

1:00 pm-8:40 am

1 stop12h 40m

Brussels Bruxelles-National

Wed 4/8

3:05 pm-11:40 pm

2 stops15h 35m

$615

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Thu 11/27

3:15 pm-9:40 am

2 stops35h 25m

Brussels Bruxelles-National

Thu 12/4

3:10 pm-11:42 pm

2 stops39h 32m

$644

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Fri 3/27

4:05 pm-1:15 pm

2 stops15h 10m

Brussels Bruxelles-National

Tue 3/31

9:40 am-3:24 pm

1 stop12h 44m

$651

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Fri 3/27

8:00 am-7:55 am

1 stop17h 55m

Brussels Bruxelles-National

Tue 3/31

9:40 am-3:24 pm

1 stop12h 44m

$652

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Fri 3/27

11:51 am-8:00 am

1 stop14h 09m

Brussels Bruxelles-National

Tue 3/31

10:45 am-11:40 pm

1 stop19h 55m

$656

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Thu 11/27

10:00 am-8:55 am

1 stop15h 55m

Brussels Bruxelles-National

Thu 12/4

10:10 am-5:03 pm

1 stop13h 53m

$707

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

11:55 am-7:22 pm

1 stop14h 27m

$733

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

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 November 5, 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 November 5, 2025.
Read reviews from past customers who have flown United Airlines and Lufthansa 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
9,002 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

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
9,002 reviews
United Airlines
7.4
Good
9,002 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

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
7,555 reviews
United Airlines
7.4
Good
9,002 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

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 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 12h 40m. Fly via Delta, KLM, or Scandinavian Airlines 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.

See more FAQs

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Top 2 airlines flying from St. Louis to Belgium

Discover the top 2 airlines 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 November 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$654Average$791FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$829Average$2,205FlexibilityNo cancel feeOn-time76%

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