$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 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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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

Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
9:35 pm - 3:05 pm
STL
-
BRU
10h 30m
1 stop
Multiple Airlines Logo
7:05 pm - 7:46 pm
BRU
-
STL
31h 41m
2 stops
$867Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
British Airways Logo
9:35 pm - 9:55 am
STL
-
BRU
29h 20m
1 stop
British Airways Logo
8:50 pm - 7:30 pm
BRU
-
STL
29h 40m
1 stop
$878British Airways
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
9:40 pm - 8:00 pm
STL
-
BRU
15h 20m
1 stop
Multiple Airlines Logo
8:40 pm - 7:46 pm
BRU
-
STL
30h 06m
2 stops
$883Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
6:06 am - 2:10 pm
STL
-
BRU
25h 04m
2 stops
Multiple Airlines Logo
8:40 pm - 7:46 pm
BRU
-
STL
30h 06m
2 stops
$920Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
7:44 am - 10:35 pm
STL
-
BRU
31h 51m
2 stops
Multiple Airlines Logo
7:05 pm - 7:46 pm
BRU
-
STL
31h 41m
2 stops
$921Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
American Airlines Logo
9:35 pm - 8:25 pm
STL
-
BRU
15h 50m
1 stop
American Airlines Logo
10:50 am - 11:31 pm
BRU
-
STL
19h 41m
2 stops
$928American Airlines
Wed, Sep 30 - Mon, Oct 5
British Airways Logo
9:35 pm - 3:05 pm
STL
-
BRU
10h 30m
1 stop
British Airways Logo
8:50 pm - 11:41 pm
BRU
-
STL
33h 51m
2 stops
$931British Airways
Sun, Sep 20 - Sun, Sep 27
British Airways Logo
9:40 pm - 8:00 pm
STL
-
BRU
15h 20m
1 stop
British Airways Logo
10:40 am - 7:30 pm
BRU
-
STL
15h 50m
1 stop
$946British Airways
Wed, Sep 30 - Mon, Oct 5
British Airways Logo
9:35 pm - 8:25 pm
STL
-
BRU
15h 50m
1 stop
British Airways Logo
10:50 am - 8:08 pm
BRU
-
STL
16h 18m
2 stops
$953British Airways
Mon, Aug 3 - Mon, Aug 17
Multiple Airlines Logo
7:06 am - 2:25 pm
STL
-
BRU
24h 19m
2 stops
Multiple Airlines Logo
8:50 pm - 11:59 pm
BRU
-
STL
34h 09m
2 stops
$961Multiple 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 July, when the average cost of round-trip tickets is $1,132 and $877 respectively.

Good to know

Low seasonJanuary
Cheapest flight$390
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly and prices are also 18% 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 9683 reviews
7.1Entertainment
6.6Food
7.7Boarding
7.3Comfort
8.1Crew
Airline reviews

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

6.0 GoodAnonymous, May 2026
DEN - ORD
Read more United Airlines reviews

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Cree was organized and pleasant. Plane had good seating but as it’s a shuttle toilets hadn’t been thoroughly cleaned (eg. bins too full)

I liked that my son and I were reseated next to each other (we had different bookings). I liked that it was a directg flight and mostly on time. I liked that you provided pillows and blankets. Flight attendants were generally courteous. The messaging through wifi did not work well. The food was not good. Seats are very narrow and I felt slightly claustraphobic in the window seat.

Overall a good experience, but no wifi available for free or for purchase and we got wet from condensation or other water source during descent.

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Definitely get premium economy on a flight this long if you can. Your legs and while body will thank you.

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

I upgraded to the business class cabin. It was the poorest business class I have ever experienced. No access to any business lounge in Tampa airport. Seats are not comfortable. I had a window seat and had to step/crawl over the next seat. Food was mediocre and service below average for business class. Bathroom location was ridiculous. No place to wait. I cannot believe I paid this kind of money and will never fly Lufthansa Discover again. They really should reimburse me somehow.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

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

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

Information on your arrival and departure airports