$358 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 8/3. 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

Thu, May 7 - Thu, May 14
Multiple Airlines Logo
12:27 pm - 6:20 pm
STL
-
BRU
22h 53m
2 stops
Multiple Airlines Logo
6:30 am - 10:19 pm
BRU
-
STL
22h 49m
2 stops
$826Multiple Airlines
Wed, Aug 26 - Sat, Dec 5
Multiple Airlines Logo
12:43 pm - 6:20 pm
STL
-
BRU
22h 37m
2 stops
Multiple Airlines Logo
11:35 am - 11:59 pm
BRU
-
STL
19h 24m
2 stops
$840Multiple Airlines
Wed, May 13 - Thu, May 21
Air Canada Logo
1:05 pm - 1:15 pm
STL
-
BRU
17h 10m
2 stops
Air Canada Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$849Air Canada
Wed, May 13 - Thu, May 21
Air Canada Logo
1:05 pm - 7:10 am
STL
-
BRU
11h 05m
1 stop
Air Canada Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$853Air Canada
Wed, May 13 - Thu, May 21
Air Canada Logo
1:05 pm - 8:55 am
STL
-
BRU
36h 50m
2 stops
Air Canada Logo
9:55 am - 12:11 pm
BRU
-
STL
33h 16m
2 stops
$855Air Canada
Sat, May 2 - Sat, May 9
Finnair Logo
5:21 pm - 6:20 pm
STL
-
BRU
17h 59m
2 stops
Finnair Logo
7:45 pm - 10:19 pm
BRU
-
STL
33h 34m
2 stops
$885Finnair
Tue, May 19 - Wed, May 27
United Airlines Logo
11:34 am - 1:15 pm
STL
-
BRU
18h 41m
2 stops
United Airlines Logo
9:55 am - 11:41 am
BRU
-
STL
32h 46m
2 stops
$893United Airlines
Tue, May 19 - Wed, May 27
United Airlines Logo
11:34 am - 1:15 pm
STL
-
BRU
18h 41m
2 stops
United Airlines Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$906United Airlines
Sat, May 9 - Sat, May 16
Multiple Airlines Logo
1:05 pm - 7:50 am
STL
-
BRU
35h 45m
2 stops
Multiple Airlines Logo
5:30 pm - 1:25 pm
BRU
-
STL
26h 55m
1 stop
$922Multiple Airlines
Sat, May 9 - Sat, May 16
Lufthansa Logo
7:11 pm - 9:00 am
STL
-
BRU
30h 49m
1 stop
Lufthansa Logo
2:25 pm - 1:25 pm
BRU
-
STL
30h 00m
1 stop
$932Lufthansa
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 $1,282 respectively.

Good to know

Low seasonJanuary
Cheapest flight$358
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly and prices are also 25% 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 9491 reviews
6.6Food
7.7Boarding
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

They promise free wi-fi prior to boarding and then once on board you are informed you have to purchase wifi even after being a mileagePlus member.

4.0 OkaySasha, Mar 2026
EWR - CLT
Read more United Airlines reviews

They promise free wi-fi prior to boarding and then once on board you are informed you have to purchase wifi even after being a mileagePlus member.

I've been flying American mostly, and it's been very frustrating. This united flight makes me realize maybe the issue isn't flying, but the airline. United was a significantly better experience. The plane was more comfortable, with a normal amount of leg room (vs the ridiculous reductions AA has made), more comfortable seats, screens to watch movies. It was a much better experience!

Awful. No counter attendants. No dinner offered due to delays.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

3 hour delay…. Nearly 2 hours sitting on tarmac. Do better, United. Or at least have the sense to not say “we hope you enjoyed your flight with us” upon disembarking.

Flights were on time. Free Wifi on plane. Everything was well organized.

During landing. 2 crew members passed 3 times by my lane and didn't notice that people in front of us had their site to the furthermore reclined... That was uncomfortable and could have been dangerous.

They delayed the flight from 9:00 to 11:55 At 11:45 they canceled the flight. I paid a premium price for the tickets with poor service

We had excellent customer service despite the chaos at George Bush airport in Houston!

It isvvery small flight. No leg room . No space to put my personal item at feet.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Economy Priority seats are extremely uncomfortable. There is no way to escape the boxed in feeling, particularely because the distance between to rows are too short, the hard edge of the front row is keeping legs confined. There is no elevated place to put your feet. I am of average, European size.

Terrible. Both flights were significantly delayed, no luggage, made me check my small bag when many, many others had much larger carry-ons, not even a bottle of water . . . I will not fly Discover Airlines again.

I was deceived on the Kayak site expecting a ticket, but instead finding a "standby" reservation. When I tried to change the ticket, I paid almost twice the price of the original ticket. Then, the airline refused to give me the reserved seat I had chosen and paid for. I think I deserve a refund for this leg of my trip because I was doubly charged and did not receive what I had paid for. I put in a complaint with Lufthansa because the ticket was sold originally sold as a flight they listed. Someone here needs to take responsibility.

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.

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

Information on your arrival and departure airports