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$300+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BRU
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap 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 February 11, 2026.

This Mytrip deal was found by Cheapflights users on 2/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/119:10 am
STL
-
BRU
2 stops39h 00m
Air Canada
Wed 4/229:25 am
BRU
-
STL
2 stops42h 43m
Air Canada
Deal found 2/10$492
This Cheapflightsfares deal was found by Cheapflights users on 2/9. 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.
Wed 3/1811:28 am
STL
-
BRU
2 stops19h 42m
Lufthansa
Wed 3/2512:45 pm
BRU
-
STL
2 stops16h 14m
Lufthansa
Deal found 2/9$505
This United Airlines deal was found by Cheapflights users on 2/9. 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 3/171:14 pm
STL
-
BRU
2 stops18h 01m
United Airlines
Tue 3/2410:15 am
BRU
-
STL
2 stops16h 52m
United Airlines
Deal found 2/9$510
This Mytrip deal was found by Cheapflights users on 2/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/84:05 pm
STL
-
BRU
2 stops34h 50m
Air Canada
Sun 3/1510:00 am
BRU
-
STL
2 stops35h 29m
Air Canada
Deal found 2/8$511
This United Airlines deal was found by Cheapflights users on 2/10. 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 4/112:40 pm
STL
-
BRU
2 stops33h 30m
United Airlines
Wed 4/2210:15 am
BRU
-
STL
1 stop33h 07m
United Airlines
Deal found 2/10$512
This United Airlines deal was found by Cheapflights users on 2/8. 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 3/188:17 am
STL
-
BRU
1 stop17h 38m
United Airlines
Wed 3/2510:15 am
BRU
-
STL
2 stops16h 52m
United Airlines
Deal found 2/8$514
This United Airlines deal was found by Cheapflights users on 2/8. 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.
Sun 3/87:41 am
STL
-
BRU
1 stop18h 14m
United Airlines
Sun 3/159:00 am
BRU
-
STL
2 stops36h 29m
United Airlines
Deal found 2/8$515
This KLM deal was found by Cheapflights users on 2/9. 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.
Tue 3/175:21 pm
STL
-
BRU
1 stop32h 39m
KLM
Tue 3/2410:00 am
BRU
-
STL
1 stop29h 05m
KLM
Deal found 2/9$621
This Cheapflightsfares deal was found by Cheapflights users on 2/10. 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 3/34:49 pm
STL
-
BRU
2 stops16h 26m
Lufthansa
Sun 3/87:00 am
BRU
-
STL
1 stop13h 55m
Lufthansa
Deal found 2/10$678
This United Airlines deal was found by Cheapflights users on 2/10. 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 3/11:11 pm
STL
-
BRU
2 stops17h 04m
United Airlines
Wed 3/1110:00 am
BRU
-
STL
2 stops34h 42m
United Airlines
Deal found 2/10$686
This Mytrip deal was found by Cheapflights users on 2/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/254:50 pm
STL
-
CRL
2 stops24h 00m
Multiple Airlines
Tue 3/3112:25 pm
CRL
-
STL
2 stops32h 00m
Multiple Airlines
Deal found 2/7$870
This Mytrip deal was found by Cheapflights users on 2/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1612:10 pm
STL
-
CRL
2 stops26h 15m
Multiple Airlines
Mon 8/241:15 pm
CRL
-
STL
3 stops31h 10m
Multiple Airlines
Deal found 2/10$1,257

Find 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 February 11, 2026.

Round-trip from

$492
(Mytrip)

One-way from

$300
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$494
From Lambert-St Louis to Belgium
Search Deals
One-way flight from Lambert-St Louis to Belgium
Search Deals
Highest demand for flights based on searches. 25% potential increase in price ($313 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 14% potential price decrease ($117 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 11, 2026.
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 4/11

9:10 am-7:10 am

2 stops39h 00m

Brussels Bruxelles-National

Wed 4/22

9:25 am-9:08 pm

2 stops42h 43m

$492

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 3/17

1:14 pm-1:15 pm

2 stops18h 01m

Brussels Bruxelles-National

Tue 3/24

10:15 am-9:07 pm

2 stops16h 52m

$510

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sat 4/11

2:40 pm-7:10 am

2 stops33h 30m

Brussels Bruxelles-National

Wed 4/22

10:15 am-12:22 pm

1 stop33h 07m

$512

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

11:25 am-7:55 am

1 stop14h 30m

Brussels Bruxelles-National

Wed 3/25

10:15 am-9:07 pm

2 stops16h 52m

$514

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sun 3/8

7:41 am-7:55 am

1 stop18h 14m

Brussels Bruxelles-National

Sun 3/15

9:00 am-3:29 pm

2 stops36h 29m

$515

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 3/17

5:21 pm-8:00 am

1 stop32h 39m

Brussels Bruxelles-National

Tue 3/24

10:00 am-9:05 am

1 stop29h 05m

$621

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 3/3

4:49 pm-4:15 pm

2 stops16h 26m

Brussels Bruxelles-National

Sun 3/8

7:00 am-1:55 pm

1 stop13h 55m

$678

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sun 3/1

1:11 pm-1:15 pm

2 stops17h 04m

Brussels Bruxelles-National

Wed 3/11

10:00 am-2:42 pm

2 stops34h 42m

$686

St. LouisBrussels

STL - CRL

STLCRL

Lambert-St Louis

Wed 3/25

4:50 pm-10:50 pm

2 stops24h 00m

Charleroi Brussels

Tue 3/31

12:25 pm-1:25 pm

2 stops32h 00m

$870

St. LouisBrussels

STL - CRL

STLCRL

Lambert-St Louis

Sun 3/8

4:50 pm-6:15 pm

2 stops19h 25m

Charleroi Brussels

Sun 3/15

3:20 pm-6:00 pm

3 stops32h 40m

$1,731

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 16 results
1
2

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, April is the cheapest month in which you can book a flight from St. Louis to Belgium (average of $443). 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.

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 February 11, 2026.
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
9,273 reviews

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,273 reviews
United Airlines
7.4
Good
9,273 reviews

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Lufthansa
6.8
Okay
7,777 reviews
United Airlines
7.4
Good
9,273 reviews

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 18h 01m. Fly via Air Canada or United 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, April is the cheapest month in which you can book a flight from St. Louis to Belgium (average of $443). 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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Alternative routes for St. Louis to Belgium

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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 February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$441Average$2,205FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$606Average$785FlexibilityNo cancel feeOn-time69%

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