$412 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 4/28. 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, Apr 28 - Tue, May 5
Scandinavian Airlines Logo
11:42 am - 9:40 am
STL
-
BRU
38h 58m
2 stops
Scandinavian Airlines Logo
10:20 am - 9:19 pm
BRU
-
STL
17h 59m
2 stops
$686Scandinavian Airlines
Tue, Apr 14 - Tue, Apr 28
British Airways Logo
4:30 pm - 3:15 pm
STL
-
BRU
15h 45m
2 stops
British Airways Logo
7:55 pm - 7:30 pm
BRU
-
STL
30h 35m
1 stop
$725British Airways
Tue, Apr 14 - Tue, Apr 28
Finnair Logo
12:27 pm - 10:35 pm
STL
-
BRU
27h 08m
2 stops
Finnair Logo
7:05 pm - 7:30 pm
BRU
-
STL
31h 25m
2 stops
$735Finnair
Tue, Apr 28 - Tue, May 5
British Airways Logo
9:35 pm - 3:15 pm
STL
-
BRU
10h 40m
1 stop
British Airways Logo
7:55 pm - 7:30 pm
BRU
-
STL
30h 35m
2 stops
$747British Airways
Sun, May 3 - Tue, May 12
Multiple Airlines Logo
9:40 pm - 8:00 pm
STL
-
BRU
15h 20m
1 stop
Multiple Airlines Logo
7:05 am - 10:19 pm
BRU
-
STL
22h 14m
2 stops
$759Multiple Airlines
Sun, May 3 - Tue, May 12
British Airways Logo
4:30 pm - 2:10 pm
STL
-
BRU
14h 40m
2 stops
British Airways Logo
10:55 am - 7:33 pm
BRU
-
STL
15h 38m
2 stops
$762British Airways
Tue, May 5 - Tue, May 12
Finnair Logo
5:21 pm - 6:20 pm
STL
-
BRU
17h 59m
2 stops
Finnair Logo
11:20 am - 10:19 pm
BRU
-
STL
17h 59m
2 stops
$765Finnair
Sun, May 3 - Tue, May 12
Multiple Airlines Logo
5:21 pm - 10:35 pm
STL
-
BRU
22h 14m
2 stops
Multiple Airlines Logo
6:30 am - 11:56 pm
BRU
-
STL
24h 26m
2 stops
$766Multiple Airlines
Thu, Apr 30 - Thu, May 7
British Airways Logo
5:21 pm - 4:10 pm
STL
-
BRU
15h 49m
2 stops
British Airways Logo
10:50 am - 10:19 pm
BRU
-
STL
18h 29m
2 stops
$771British Airways
Mon, May 4 - Mon, May 11
Finnair Logo
5:21 pm - 10:35 pm
STL
-
BRU
22h 14m
2 stops
Finnair Logo
7:05 pm - 7:30 pm
BRU
-
STL
31h 25m
2 stops
$774Finnair
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$412
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 9451 reviews
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
7.1Entertainment
Airline reviews

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

8.0 ExcellentMatthew, Mar 2026
IAD - CMH
Read more United Airlines reviews

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

Experience was great - no complaints. Took off on time, landed early. Got to the gate relatively quickly - took a little bit of extra time to deplane but nothing excessive.

Business class seats felt very cramped compared to other airlines.

Economy plus was so cramped I could not use my laptop. It was beyond bad.

OK, we were delayed and had to de plane and reboard.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

Both our flights were delayed. Almost didn’t get in the second flight. Staff was rude to the bone.

Both my flight where delayed Had 25min to make it to my transfer flight

Everything was on time and service on the flight was great!

Wifi Bluetooth features for watching in flight movie was horrible. Screen kept blacking out no connection of sound although it said connected. Other than that smooth trip .

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