$271 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 1/24. 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

Tue, Feb 3 - Tue, Feb 10
Air Canada Logo
6:40 pm - 7:50 am
STL
-
BRU
30h 10m2 stops
Air Canada Logo
10:00 am - 10:58 pm
BRU
-
STL
19h 58m2 stops
$457Air Canada
Tue, Feb 3 - Tue, Feb 10
United Airlines Logo
11:20 am - 8:55 am
STL
-
BRU
14h 35m1 stop
United Airlines Logo
10:10 am - 10:58 pm
BRU
-
STL
19h 48m1 stop
$459United Airlines
Tue, Feb 3 - Tue, Feb 10
United Airlines Logo
3:11 pm - 8:55 am
STL
-
BRU
10h 44m1 stop
United Airlines Logo
10:10 am - 10:00 pm
BRU
-
STL
18h 50m2 stops
$463United Airlines
Wed, Jan 21 - Wed, Feb 18
United Airlines Logo
8:30 am - 7:15 am
STL
-
BRU
15h 45m1 stop
United Airlines Logo
11:55 am - 10:13 am
BRU
-
STL
29h 18m1 stop
$465United Airlines
Sat, Jan 24 - Tue, Feb 17
Air Canada Logo
4:05 pm - 7:50 am
STL
-
BRU
32h 45m2 stops
Air Canada Logo
10:00 am - 3:29 pm
BRU
-
STL
36h 29m2 stops
$467Air Canada
Sat, Jan 24 - Wed, Feb 18
Air Canada Logo
4:05 pm - 7:50 am
STL
-
BRU
32h 45m2 stops
Air Canada Logo
10:00 am - 9:05 pm
BRU
-
STL
18h 05m2 stops
$469Air Canada
Sun, Jan 25 - Tue, Feb 17
British Airways Logo
12:01 pm - 4:40 pm
STL
-
BRU
21h 39m2 stops
British Airways Logo
12:00 pm - 1:43 pm
BRU
-
STL
32h 43m2 stops
$471British Airways
Thu, Mar 19 - Thu, Mar 26
Delta Logo
4:21 pm - 8:00 am
STL
-
BRU
33h 39m1 stop
Delta Logo
10:00 am - 9:06 pm
BRU
-
STL
17h 06m1 stop
$484Delta
Wed, Jan 21 - Tue, Feb 17
United Airlines Logo
6:30 am - 8:55 am
STL
-
BRU
19h 25m1 stop
United Airlines Logo
10:00 am - 9:05 pm
BRU
-
STL
18h 05m2 stops
$487United Airlines
Wed, Jan 21 - Wed, Feb 18
United Airlines Logo
9:57 am - 7:15 am
STL
-
BRU
14h 18m2 stops
United Airlines Logo
11:55 am - 9:05 pm
BRU
-
STL
16h 10m2 stops
$488United 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$271
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 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.

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 9138 reviews
6.6Food
7.1Entertainment
8.1Crew
7.7Boarding
7.3Comfort
Airline reviews

It was great with United overall except for two things. 1) It was a 5-hour flight and we were with kids, so we were asking for extra snacks. They were extremely reticent to dole them out even though there wasn't any meal and the kids were starting to hit their limit towards the end. 2) Baggage didn't arrive until 80 minutes after we landed.

6.0 GoodTobin, Jan 2026
LAX - CUN
Read more United Airlines reviews

It was great with United overall except for two things. 1) It was a 5-hour flight and we were with kids, so we were asking for extra snacks. They were extremely reticent to dole them out even though there wasn't any meal and the kids were starting to hit their limit towards the end. 2) Baggage didn't arrive until 80 minutes after we landed.

They lost my luggage, so, not happy. The crew was nice but my suitcases never made it, still trying to find out what happened!

The staff was hospitable and professional. The seat had a bit of wear. The winner shade was stuck 1/4 open. I received the best of both worlds. The morning sun was able to come in and blind the screen i was trying to use while at the same time it was too low to look out and enjoy the view. Rather embarrassing for a 1st class ticket.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

Aircraft was noisy, old and never dimmed the lights on a night flight even on business class! I flew 17 times on United and probably another 40 on other airlines United USA /Europe flights were the worst to include luggage delayed once going to europe and once coming back

Check how old the airframe is, some older ones have inoperable seat back entertainment or power.

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.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

love the crews and my only problem was the delay at Frankfurt was very bad. I have travelled with Lufthansa for over 30 years now and this was cost me some planned business appointment

The flight delay made the connection a bit tight but that's outside the flight crew's control.

We just made it to our connecting flight. A long, long speed walk!

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

Information on your arrival and departure airports