$472 Find Cheap Flights from St. Louis to Belgium

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Belgium departing on 9/20. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

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Cheap Flights from St. Louis to Belgium

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Brussels
Brussels2 stops$526
Brussels
Brussels2 stops$526

Book Cheap St. Louis to Belgium Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Belgium that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Belgium

Mon, Jan 12 - Fri, Jan 23
Scandinavian Airlines Logo
4:00 pm - 2:30 pmSTL-BRU
15h 30m2 stops
Scandinavian Airlines Logo
10:20 am - 8:39 pmBRU-STL
17h 19m2 stops
$526Scandinavian Airlines
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Wed, Nov 12 - Thu, Nov 27
United Airlines Logo
6:30 am - 8:55 amSTL-BRU
19h 25m1 stop
United Airlines Logo
10:00 am - 9:40 pmBRU-STL
42h 40m2 stops
$534United Airlines
Find Deal
Tue, Dec 9 - Tue, Dec 23
 Logo
5:27 pm - 8:55 amSTL-BRU
32h 28m1 stop
 Logo
10:00 am - 3:29 pmBRU-STL
36h 29m2 stops
Tue, Dec 9 - Tue, Dec 23
Air Canada Logo
6:30 am - 7:50 amSTL-BRU
18h 20m2 stops
Air Canada Logo
10:00 am - 3:29 pmBRU-STL
36h 29m2 stops
$548Air Canada
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Mon, Jan 12 - Fri, Jan 23
United Airlines Logo
9:57 am - 8:55 amSTL-BRU
15h 58m1 stop
United Airlines Logo
10:10 am - 9:13 pmBRU-STL
18h 03m1 stop
$556United Airlines
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Tue, Dec 9 - Tue, Dec 23
 Logo
10:00 am - 8:55 amSTL-BRU
15h 55m1 stop
 Logo
7:30 pm - 1:55 pmBRU-STL
25h 25m1 stop
Tue, Oct 7 - Tue, Oct 14
Air Canada Logo
1:30 pm - 8:05 amSTL-BRU
11h 35m1 stop
Air Canada Logo
10:00 am - 7:57 pmBRU-STL
16h 57m1 stop
$587Air Canada
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Wed, Nov 12 - Thu, Nov 27
Lufthansa Logo
10:00 am - 8:55 amSTL-BRU
15h 55m1 stop
Lufthansa Logo
7:30 pm - 1:55 pmBRU-STL
25h 25m1 stop
$637Lufthansa
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Tue, Mar 3 - Mon, Mar 9
American Airlines Logo
2:21 pm - 10:50 amSTL-BRU
13h 29m2 stops
American Airlines Logo
11:50 am - 11:32 pmBRU-STL
17h 42m3 stops
$641American Airlines
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Sun, Sep 28 - Thu, Oct 2
Lufthansa Logo
3:30 pm - 10:10 amSTL-BRU
11h 40m1 stop
Lufthansa Logo
8:30 am - 3:44 pmBRU-STL
14h 14m2 stops
$1,805Lufthansa
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Booking Insights

KAYAK's insights & trends for St. Louis to Belgium flights

Get data-powered insights and trends into flights from St. Louis to Belgium to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from St. Louis to Belgium?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Belgium, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Belgium is February, when tickets cost $690 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $1,296 and $1,127 respectively.

What’s the cheapest day of the week to fly from St. Louis to Belgium?

The average price of all round-trip flights from St. Louis to Belgium clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Belgium on a Friday and more expensive on a Monday. On your return trip to St. Louis, you should consider flying back on a Friday, and avoid Saturdays for better deals.

Good to know

Low seasonApril
Cheapest flight$472
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 12% lower on average.
Flight from St. Louis to Charleroi Brussels

FAQs - booking Belgium flights

  • How does KAYAK find such low prices on flights from St. Louis to Belgium?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Belgium.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Belgium?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis to Belgium is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Belgium?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from St. Louis to Belgium with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Belgium?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from St. Louis to Belgium up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Belgium?

    The cheapest time of day to fly to Belgium is generally in the evening, when round-trip flights cost $1,088 on average. Morning departures are around 17% more expensive than evening flights, on average. The most expensive time of day to fly to Belgium is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,420.

Reviews of the top airline flying from St. Louis to Belgium

 
Need help choosing which airline to fly with from St. Louis to Belgium? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8937 reviews
7.1Entertainment
8.1Crew
7.7Boarding
7.3Comfort
6.6Food
Airline reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

2.0 MediocreAnonymous, Sep 2025SFO - MEX
Read more United Airlines reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

Everything you need to know for your flight from St. Louis to Belgium

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