$390 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, 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

Mon, Oct 12 - Wed, Nov 11
Air Canada Logo
12:10 pm - 8:55 am
STL
-
BRU
37h 45m
2 stops
Air Canada Logo
10:00 am - 2:18 pm
BRU
-
STL
35h 18m
2 stops
$810Air Canada
Mon, Oct 12 - Wed, Nov 11
Air Canada Logo
12:10 pm - 7:10 am
STL
-
BRU
12h 00m
1 stop
Air Canada Logo
10:00 am - 2:18 pm
BRU
-
STL
35h 18m
2 stops
$813Air Canada
Mon, Aug 24 - Sat, Sep 5
Scandinavian Airlines Logo
3:39 pm - 7:50 pm
STL
-
BRU
21h 11m
2 stops
Scandinavian Airlines Logo
8:30 pm - 8:38 pm
BRU
-
STL
31h 08m
2 stops
$819Scandinavian Airlines
Mon, Oct 12 - Wed, Nov 11
United Airlines Logo
12:10 pm - 7:10 am
STL
-
BRU
12h 00m
1 stop
United Airlines Logo
8:25 am - 1:45 pm
BRU
-
STL
12h 20m
1 stop
$830United Airlines
Mon, Jul 27 - Tue, Aug 4
Multiple Airlines Logo
9:20 am - 7:50 am
STL
-
BRU
15h 30m
2 stops
Multiple Airlines Logo
6:20 am - 3:46 pm
BRU
-
STL
16h 26m
2 stops
$865Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
12:46 pm - 3:05 pm
STL
-
BRU
19h 19m
2 stops
Multiple Airlines Logo
7:05 pm - 10:00 pm
BRU
-
STL
33h 55m
2 stops
$871Multiple Airlines
Mon, Jul 27 - Tue, Aug 4
Multiple Airlines Logo
3:22 pm - 9:00 am
STL
-
BRU
10h 38m
1 stop
Multiple Airlines Logo
9:55 am - 6:42 pm
BRU
-
STL
15h 47m
2 stops
$872Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
11:01 am - 6:20 pm
STL
-
BRU
24h 19m
2 stops
Multiple Airlines Logo
7:05 pm - 10:00 pm
BRU
-
STL
33h 55m
2 stops
$884Multiple Airlines
Mon, Jul 27 - Tue, Aug 4
KLM Logo
10:51 am - 7:40 am
STL
-
BRU
13h 49m
1 stop
KLM Logo
9:45 am - 4:17 pm
BRU
-
STL
13h 32m
1 stop
$889KLM
Mon, Aug 24 - Sat, Sep 5
United Airlines Logo
12:59 pm - 9:00 am
STL
-
BRU
13h 01m
1 stop
United Airlines Logo
9:30 am - 10:12 am
BRU
-
STL
31h 42m
2 stops
$900United 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 April, when tickets cost $414 (return) on average. On the other hand, the most expensive months are June and May, when the average cost of round-trip tickets is $1,282 and $1,053 respectively.

Good to know

Low seasonJanuary
Cheapest flight$390
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly and prices are also 21% 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 9783 reviews
7.7Boarding
7.1Entertainment
7.3Comfort
6.6Food
8.1Crew
Airline reviews

Smooth travel. Immediate update prior flight delay so I can arrange myself properly without too rush.

10.0 ExcellentNakin, Jun 2026
ORD - HND
Read more United Airlines reviews

Smooth travel. Immediate update prior flight delay so I can arrange myself properly without too rush.

Everything was the best it could be. Crew found me with pre- ordered food. Excellent experience!

Improve the food offerings and cabin seating. My wife would prefer to fly another airline, even with a connection for a more comfortable trip. A 737-8 should not be scheduled for a 6 hour segment, which turned into 7.5 hours due to the origin ground delay.

Packed flight, which makes it tough on crew and boarding staff (and the customers of course). But this was great boarding, clear instructions, etc. Traveling on the weekends are always fraught with danger as you have families and less frequent flyers thus more confusion. But this flight went as planned.

Destroyed my suitcase. Tired of talking about it. Cancelling my unite mileage plus account.

Read the fine print. This was my flight home. I booked my flight for the quickest way home. Had a carry-on and a personal item. Same as my outbound flight. Apparently I needed to pre-pay extra for my carry-on. When I checked in, I was told that I had to check it. I said I’ll pay for it, and was told that this wasn’t an option anymore. They said I still had to pay $50 to check my carry-on. I told them I’ll pay whatever to just carry it in as intended. I was not allowed, so eventually I paid $50 to check my carry-on under a plane that was half full, with overhead compartments that were even less full. My white carry-on suitcase was practically destroyed getting from Idaho falls to Denver to Orange County. The low price air fair was a bait and switch. Got me to the gate, made me pay extra, then didn’t even allow me to pay for a carry on. Not to mention that I paid the $8 for WiFi that didn’t work. All to get my suitcase destroyed. I don’t think I’m going to even keep my Untied mileage plus membership and card. Apparently, membership does not have its privileges for this one.

The flight was delayed, they didn’t even have water for the toilets or for drinks

Even through the flight was delayed due to storms near IAH The flight was great! The crew was so hospitable and professional

I flew from Santa Fe to Denver to catch a flight to London and the transfer of my luggage on arrival at Denver to the London flight worked perfectly. The crew on the ground and on board for the London flight were so friendly and efficient.

Boarded early; and arrived home 40 mins early. After a long flight, it’s nice to be back home early. These flights have no amenities; no snacks. So need to bring your own

Put me on standby; flight was late; missed my connecting flight; disaster

Flight attendants were fine, seats a bit hard but I use a cushion for extra support. The only issue was it was a bit too cool and I needed to ask for and received and extra blanket. I survived!!!

Very few things and/or people are excellent. It was very good.

Extremely uncomfortable seats. Experience was like a Frontier Airlines flight. Would not fly it again.

Very, very tight legroom. They must’ve jammed in an additional few rows of seat seating. Denver to Munich was the least legroom I’ve ever had on any flight, let alone a multi hour international journey. I will not take that flight again.

In my first flight with Air Canada we sat in the plane for 4:00pm to 6:30pm. Finally we were asked to get off the plane and we were told the flight was cancelled after 7:00pm There was o clear explanation of what was the problem. I was booked without my permission on a Delta Flight at 7:30pm that was leaving at 8:00pm and I still had to go get my luggage(my final destination was Rome with one stop in Toronto. The luggage claim for Canada was closed so had to return to finally get it on the luggage belt.. Of course I missed the Delta flight and all the next day flights were booked. I also lost what I paid for my stay in Rome because I did nt cancel in time. A complete nightmare.

Good food, overall very comfy. The flight was full so obviously not optimal, but it is what it is.

Perfect airline, super friendly, great service, tasty food. Would fly again.

Parents with permanently crying baby on board. Neither parents nor crew did anything to calm the baby. The food was extremely disappointing. Seafood stew was very, very small! Not even appetizer size! Seat had a gap in the back. Had to use a pillow to fill it.

Food choices limited & not enticing Seats quite uncomfortable & difficult to control

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

Information on your arrival and departure airports