$359 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 3/6. 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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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

Sun, Mar 1 - Wed, Mar 11
United Airlines Logo
7:41 am - 8:55 am
STL
-
BRU
18h 14m
1 stop
United Airlines Logo
10:00 am - 2:42 pm
BRU
-
STL
34h 42m
2 stops
$489United Airlines
Wed, Mar 18 - Wed, Mar 25
Air Canada Logo
7:40 am - 7:50 am
STL
-
BRU
18h 10m
2 stops
Air Canada Logo
10:00 am - 2:42 pm
BRU
-
STL
34h 42m
2 stops
$493Air Canada
Sun, Mar 1 - Wed, Mar 11
United Airlines Logo
1:11 pm - 8:55 am
STL
-
BRU
12h 44m
1 stop
United Airlines Logo
7:00 am - 2:55 pm
BRU
-
STL
13h 55m
1 stop
$507United Airlines
Wed, Feb 25 - Sun, Mar 1
United Airlines Logo
9:55 am - 8:55 am
STL
-
BRU
16h 00m
1 stop
United Airlines Logo
11:15 am - 5:00 pm
BRU
-
STL
12h 45m
1 stop
$509United Airlines
Wed, Feb 25 - Sun, Mar 1
United Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m
2 stops
United Airlines Logo
11:15 am - 5:00 pm
BRU
-
STL
12h 45m
1 stop
$510United Airlines
Wed, Feb 25 - Sun, Mar 1
Air Canada Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m
2 stops
Air Canada Logo
10:00 am - 9:05 pm
BRU
-
STL
18h 05m
2 stops
$513Air Canada
Wed, Mar 18 - Wed, Mar 25
United Airlines Logo
10:00 am - 7:55 am
STL
-
BRU
15h 55m
1 stop
United Airlines Logo
10:15 am - 10:59 pm
BRU
-
STL
18h 44m
2 stops
$514United 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
10:30 am - 9:42 pm
BRU
-
STL
17h 12m
2 stops
$517United Airlines
Wed, Feb 25 - Sun, Mar 1
United Airlines Logo
7:41 am - 8:55 am
STL
-
BRU
18h 14m
1 stop
United Airlines Logo
11:55 am - 8:23 pm
BRU
-
STL
15h 28m
1 stop
$559United Airlines
Sat, Mar 7 - Sat, Mar 14
Multiple Airlines Logo
4:05 pm - 9:40 pm
STL
-
CRL
22h 35m
3 stops
Multiple Airlines Logo
9:40 pm - 2:55 pm
CRL
-
STL
23h 15m
2 stops
$1,480Multiple 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 $512 (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 seasonApril
Cheapest flight$359
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly and prices are also 17% 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 9214 reviews
7.7Boarding
7.1Entertainment
7.3Comfort
8.1Crew
6.6Food
Airline reviews

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

8.0 ExcellentAnonymous, Jan 2026
ORD - TPA
Read more United Airlines reviews

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

The food was terrible this time. Otherwise pleasant, quiet, on-time.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

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.

Even after a delay, getting off the ground, thanks for keeping me safe, the airline made certain that my connecting flight was rebooked to get me to my final destination. It was actually rebooked twice, and my luggage still managed to meet me. The airline gave me a credit for food and beverage to be used at the airport vendors, regretfully, the credit did not transfer to my final boarding pass. Oh, well…

Trip was smooth, good drew, average meal, almost cold coffee. Excellent landing. Did not enjoy going down the stairs, walking to the gate, walking up the stairs, going a long walk to the exchange gate, and going down the stairs again to be bussed all the way where we originally landed to take our next flight! Over all an average experience. Thank you.

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

Information on your arrival and departure airports