$371 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 5/17. 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

Fri, Jan 16 - Tue, Jan 20
Air Canada Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
Air Canada Logo
10:00 am - 10:58 pm
BRU
-
STL
19h 58m2 stops
$476Air Canada
Sat, Jan 17 - Sat, Jan 24
Air Canada Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
Air Canada Logo
10:00 am - 3:29 pm
BRU
-
STL
36h 29m2 stops
$480Air Canada
Thu, Jan 29 - Thu, Feb 5
United Airlines Logo
9:57 am - 1:15 pm
STL
-
BRU
20h 18m2 stops
United Airlines Logo
10:00 am - 11:02 am
BRU
-
STL
32h 02m2 stops
$485United Airlines
Thu, Jan 29 - Tue, Feb 3
United Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
United Airlines Logo
10:00 am - 2:30 pm
BRU
-
STL
35h 30m2 stops
$487United Airlines
Thu, Jan 29 - Tue, Feb 3
United Airlines Logo
8:05 am - 8:55 am
STL
-
BRU
17h 50m1 stop
United Airlines Logo
10:00 am - 2:30 pm
BRU
-
STL
35h 30m2 stops
$488United Airlines
Wed, Feb 4 - Sun, Feb 8
Lufthansa Logo
11:22 am - 8:05 am
STL
-
BRU
13h 43m1 stop
Lufthansa Logo
9:00 am - 11:59 pm
BRU
-
STL
21h 59m2 stops
$493Lufthansa
Sat, Jan 17 - Sat, Jan 24
Multiple Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
Multiple Airlines Logo
5:30 pm - 1:55 pm
BRU
-
STL
27h 25m1 stop
$498Multiple Airlines
Fri, Jan 16 - Tue, Jan 20
United Airlines Logo
6:30 am - 8:55 am
STL
-
BRU
19h 25m1 stop
United Airlines Logo
11:15 am - 11:59 pm
BRU
-
STL
19h 44m1 stop
$500United Airlines
Thu, Jan 29 - Tue, Feb 3
Lufthansa Logo
11:22 am - 8:05 am
STL
-
BRU
13h 43m1 stop
Lufthansa Logo
10:10 am - 5:43 pm
BRU
-
STL
14h 33m1 stop
$504Lufthansa
Thu, Jan 29 - Tue, Feb 3
United Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
United Airlines Logo
10:10 am - 7:27 pm
BRU
-
STL
16h 17m1 stop
$506United 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 $561 (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 $1,234 respectively.

What’s the cheapest day of the week to fly from St. Louis to Belgium?

The average price of all round-trip flights from St. Louis to Belgium clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Belgium on a Friday and more expensive on a Monday. On your return trip to St. Louis, you should consider flying back on a Friday, and avoid Saturdays for better deals.

Good to know

Low seasonApril
Cheapest flight$374
Best time to beat the crowds with an average 10% drop in price.
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.

  • What is the cheapest time of day to fly to Belgium?

    The cheapest time of day to fly to Belgium is generally in the evening, when round-trip flights cost $1,088 on average. Morning departures are around 17% more expensive than evening flights, on average. The most expensive time of day to fly to Belgium is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,420.

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 9092 reviews
7.3Comfort
8.1Crew
7.7Boarding
7.1Entertainment
6.6Food
Airline reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

10.0 ExcellentRoger, Dec 2025
CAE - ORD
Read more United Airlines reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

United have really come back. Airport and boarding process is clear and good, app and information also very good

They charged a fee for 1st bag checked. Others in same party were free.

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

Ground staff and cabin crew were excellent. Flight was perfectly on time. Zero issues.

Even after a delay, getting off the ground, thanks for keeping me safe, the airline made certain that my connecting flight was rebooked to get me to my final destination. It was actually rebooked twice, and my luggage still managed to meet me. The airline gave me a credit for food and beverage to be used at the airport vendors, regretfully, the credit did not transfer to my final boarding pass. Oh, well…

Trip was smooth, good drew, average meal, almost cold coffee. Excellent landing. Did not enjoy going down the stairs, walking to the gate, walking up the stairs, going a long walk to the exchange gate, and going down the stairs again to be bussed all the way where we originally landed to take our next flight! Over all an average experience. Thank you.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

love the crews and my only problem was the delay at Frankfurt was very bad. I have travelled with Lufthansa for over 30 years now and this was cost me some planned business appointment

The flight delay made the connection a bit tight but that's outside the flight crew's control.

We just made it to our connecting flight. A long, long speed walk!

We didn't get the coffee with breakfast in the morning.. 30 mins lazer I asked flight attendant why don't we get coffee now at least.. after the breakfast..she said that captain announced possible turbulences fee minutes ago, which didn't ecplain why we didn't get it with the breakfast..breakfast was very poor btw..just little pastry which you can eat in 4 little bites. Turbulences fortunately didn't even happen.. but we didn't get that more than necessary coffee in the morning after the night flight with very poor sleep.. They just served breakfast 1 hour afzer we took off..at like 11 PM.. that doesn't make sense at all.. Also, flight attendants weren't very nice..they looked like they're not happy with their job.. :/

Lufthansa still has a good level of quality compared to US airlines, especially with respect to (1) food quality - actually tasty, (2) good French red wine - free, (3) good movie selection. Also my ticket price includes 1 free check-in luggage, while some other budget airlines sneak in an extra $150 for a checkin.

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

Information on your arrival and departure airports