$382 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

Tue, May 12 - Tue, May 19
Air Canada Logo
1:05 pm - 7:10 am
STL
-
BRU
11h 05m
1 stop
Air Canada Logo
9:40 am - 12:06 pm
BRU
-
STL
33h 26m
1 stop
$825Air Canada
Tue, May 12 - Tue, May 19
Air Canada Logo
1:05 pm - 1:15 pm
STL
-
BRU
17h 10m
2 stops
Air Canada Logo
9:40 am - 8:25 pm
BRU
-
STL
17h 45m
2 stops
$833Air Canada
Sun, Apr 26 - Sun, May 3
United Airlines Logo
1:10 pm - 1:15 pm
STL
-
BRU
17h 05m
2 stops
United Airlines Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$844United Airlines
Sun, Apr 26 - Sun, May 3
United Airlines Logo
1:10 pm - 9:00 am
STL
-
BRU
12h 50m
1 stop
United Airlines Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$848United Airlines
Wed, May 13 - Wed, May 20
United Airlines Logo
1:05 pm - 1:15 pm
STL
-
BRU
17h 10m
2 stops
United Airlines Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$849United Airlines
Sun, Apr 26 - Sun, May 3
United Airlines Logo
1:10 pm - 1:15 pm
STL
-
BRU
17h 05m
2 stops
United Airlines Logo
7:00 am - 8:25 pm
BRU
-
STL
20h 25m
2 stops
$851United Airlines
Wed, May 13 - Wed, May 20
United Airlines Logo
1:05 pm - 7:10 am
STL
-
BRU
11h 05m
1 stop
United Airlines Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$852United Airlines
Wed, May 13 - Wed, May 20
United Airlines Logo
9:21 am - 7:15 am
STL
-
BRU
14h 54m
2 stops
United Airlines Logo
11:10 am - 6:53 pm
BRU
-
STL
14h 43m
2 stops
$865United Airlines
Fri, May 1 - Fri, Sep 18
United Airlines Logo
7:45 am - 9:00 am
STL
-
BRU
18h 15m
1 stop
United Airlines Logo
7:00 am - 1:25 pm
BRU
-
STL
13h 25m
1 stop
$907United Airlines
Mon, May 18 - Tue, May 26
Multiple Airlines Logo
7:05 am - 9:30 pm
STL
-
CRL
31h 25m
3 stops
Multiple Airlines Logo
9:55 pm - 8:25 pm
CRL
-
STL
29h 30m
3 stops
$1,126Multiple 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 $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$382
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 9533 reviews
6.6Food
7.3Comfort
7.7Boarding
7.1Entertainment
8.1Crew
Airline reviews

It was perfect! I've never flown with United before, but I definitely will in the future

10.0 ExcellentAnonymous, Apr 2026
SFO - LAS
Read more United Airlines reviews

It was perfect! I've never flown with United before, but I definitely will in the future

I had a cancelled flight because of technical issues going to my destination, and a delayed flight coming home. All told it wasn’t a total bust.

Just a bad day to fly. Flight was delayed from scheduled 6:50 pm departure to 8:50 pm. Combination of factors mostly related to weather at the destination airport (which is where the incoming flight originated) which delayed the inbound flight over an hour. Once on board, we taxied but had to hold again on the taxiway for 10 minutes or so. We did not get wheels up until after 9 pm. The flight was smooth but about 18 minutes from our destination, we had to hold for several minutes more due to weather at ORD. We finally landed at ORD about 11:08 pm (accounting for the time difference, that was about a 3 hour delay from our scheduled departure time). It felt like we were never going to get to our destination. But the flight crew and attendants were very good. The movie selection onboard was also very nice. Got to watch half of a movie just during our taxi from the gate at ATL due to the delay!

Fine. The issues I had were associated with luggage being delayed from Turkey to Tanzania

No meal service to the back of the plane as it started late or was too slow to get it out before it was time to land.

Terrible, if possible won't be flying again anytime soon!

Efficient boarding and early departure. Very smooth flight. Early arrival in ATL. Great flight.

We purchase first class seats for the first time for multiples of standard economy ticket. There was no access to the club lounge and no priority boarding. The meal and the service once on the plane were superior and the seat was nicer, but not worth the price difference. I will be happy to seat in economy and spend the difference on more travel.

The business class seat is exceptional. I wish the food is more palatable.

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

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