$300 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 4/24. 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, 0 bags

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Flight Deals

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

Sat, Apr 11 - Wed, Apr 22
Air Canada Logo
9:10 am - 7:10 am
STL
-
BRU
39h 00m
2 stops
Air Canada Logo
9:25 am - 9:08 pm
BRU
-
STL
42h 43m
2 stops
$492Air Canada
Wed, Mar 18 - Wed, Mar 25
Air Canada Logo
6:25 am - 7:50 am
STL
-
BRU
19h 25m
2 stops
Air Canada Logo
10:00 am - 9:15 pm
BRU
-
STL
41h 15m
2 stops
$493Air Canada
Wed, Mar 18 - Wed, Mar 25
Lufthansa Logo
11:28 am - 1:10 pm
STL
-
BRU
19h 42m
2 stops
Lufthansa Logo
9:05 am - 10:59 pm
BRU
-
STL
19h 54m
2 stops
$505Lufthansa
Sat, Apr 11 - Wed, Apr 22
Air Canada Logo
9:10 am - 7:10 am
STL
-
BRU
39h 00m
2 stops
Air Canada Logo
9:25 am - 12:22 pm
BRU
-
STL
33h 57m
2 stops
$506Air Canada
Wed, Mar 18 - Wed, Mar 25
Multiple Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
15h 10m
2 stops
Multiple Airlines Logo
10:00 am - 3:29 pm
BRU
-
STL
35h 29m
2 stops
$511Multiple Airlines
Sat, Apr 11 - Wed, Apr 22
United Airlines Logo
2:40 pm - 7:10 am
STL
-
BRU
33h 30m
2 stops
United Airlines Logo
10:15 am - 12:22 pm
BRU
-
STL
33h 07m
1 stop
$512United Airlines
Wed, Mar 18 - Wed, Mar 25
United Airlines Logo
11:25 am - 7:55 am
STL
-
BRU
14h 30m
1 stop
United Airlines Logo
10:15 am - 9:07 pm
BRU
-
STL
16h 52m
2 stops
$514United Airlines
Wed, Mar 18 - Wed, Mar 25
United Airlines Logo
6:25 am - 7:55 am
STL
-
BRU
19h 30m
1 stop
United Airlines Logo
7:00 am - 9:07 pm
BRU
-
STL
20h 07m
2 stops
$517United Airlines
Tue, Mar 31 - Fri, Apr 10
Scandinavian Airlines Logo
12:04 pm - 9:40 am
STL
-
BRU
38h 36m
2 stops
Scandinavian Airlines Logo
3:15 pm - 9:06 pm
BRU
-
STL
36h 51m
2 stops
$635Scandinavian Airlines
Wed, Jul 22 - Tue, Aug 4
Multiple Airlines Logo
8:55 am - 10:15 pm
STL
-
CRL
30h 20m
3 stops
Multiple Airlines Logo
9:05 pm - 8:02 pm
CRL
-
STL
29h 57m
3 stops
$1,428Multiple Airlines
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 $494 (return) on average. On the other hand, the most expensive months are December and June, when the average cost of round-trip tickets is $2,205 and $1,234 respectively.

Good to know

Low seasonJanuary
Cheapest flight$300
Best time to beat the crowds with an average 30% drop in price.
Most popular time to fly and prices are also 26% lower on average.
Flight from St. Louis to Brussels Airport

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.

Reviews of the top airlines 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 9289 reviews
6.6Food
8.1Crew
7.7Boarding
7.1Entertainment
7.3Comfort
Airline reviews

The crew made our experience extremely bad. They were rude and didn’t have anything for kids.

2.0 MediocreSaachi, Feb 2026
IAH - NRT
Read more United Airlines reviews

The crew made our experience extremely bad. They were rude and didn’t have anything for kids.

Very old flight - time to retire it for newer airplanes

2+ hours delayed Outlet in row 12 did not work Tv monitors did not work Lights kept off the entire flight for at 5pm-7pm flight

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Do not like the size of the overhead bin. I think staff should monitor the size of suitcases that are being carried on by passengers to ensure they meet the size requirement.

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

Both of my flights arrived early and check in process was smooth

Terrible. No customer service, no food, no drinks on a 6 hour premier economy booking.

Short flight, but no drink/snack service. The flights both going and coming were delayed.

Excellent service; they helped me reschedule so I can fly in an earlier flight

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

Missed it by a couple minutes and couldn’t find an alternative flight so had to spend the night in DC and after much shuffling from 1 airline to another managed to get a United to Frankfurt.

There were only 2 toilets and one of them did not work in business class. We are not allowed to cross classes so had to wait in line to use the toilets!! The entertainment touch display was finicky and did not work all the time.

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

I tried both on line and by calling the Customer Service line to arrange for a special meal as i have food intolerances. I was under the impression from your service representative that I was successful. I was not. I cannot eat spicy foods and get very ill if i eat bell peppers. I could not eat either menu choice and no special meal was actually ordered. ( your representative tried to order it for a flight that did not have meal service!!! - found this out later). Your wonderful cabin crew managed to put together a fruit, salad, roll and cheese tray for me so I had something to eat. WHY WOULD YOU SERVE SPICY FOOD, WITH NO MILDER OPTION,ON AN INTERNATIONAL FLIGHT???

Crew was professional and great, flight was clean. However food was pathetic. I ordered a Hindu meal assuming no meat but they served chicken. Need to be very specific- Hindu meal should be categorize as Vegetarian - no meat or egg. Or it should be specific that we are serving meat.

Late flight Delays Poor service Poor staff Worst airline ever

Ground staff and cabin crew were excellent. Flight was perfectly on time. Zero issues.

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

Information on your arrival and departure airports