$337 Find Cheap Flights from St. Louis to Brussels - Compare and Save

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 Brussels departing on 11/4. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Brussels

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Brussels, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Brussels, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$746
Typical prices: $705-$1,506
United Airlines
Mon 11/16Thu 11/19
STL - BRU • 2 stops
Cheapest one-way
$337
American Airlines
Wed 11/4
STL - BRU • 2 stops
Top airlines
Cheapest • from $746 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Brussels (STL-BRU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Brussels 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 Brussels

Mon, Nov 16 - Thu, Nov 19
United Airlines Logo
3:15 pm - 1:15 pm
STL
-
BRU
15h 00m
2 stops
United Airlines Logo
11:15 am - 9:51 pm
BRU
-
STL
17h 36m
1 stop
$746United Airlines
Mon, Nov 16 - Thu, Nov 19
United Airlines Logo
2:00 pm - 8:05 am
STL
-
BRU
11h 05m
1 stop
United Airlines Logo
10:10 am - 6:06 pm
BRU
-
STL
14h 56m
1 stop
$750United Airlines
Mon, Nov 16 - Thu, Nov 19
United Airlines Logo
3:15 pm - 1:15 pm
STL
-
BRU
15h 00m
2 stops
United Airlines Logo
11:15 am - 9:13 pm
BRU
-
STL
16h 58m
2 stops
$751United Airlines
Fri, Oct 2 - Fri, Oct 16
Air Canada Logo
5:36 pm - 7:10 am
STL
-
BRU
54h 34m
2 stops
Air Canada Logo
9:10 am - 6:41 pm
BRU
-
STL
16h 31m
1 stop
$863Air Canada
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
12:10 pm - 1:15 pm
STL
-
BRU
18h 05m
2 stops
Multiple Airlines Logo
7:30 pm - 1:25 pm
BRU
-
STL
24h 55m
1 stop
$867Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
12:10 pm - 1:15 pm
STL
-
BRU
18h 05m
2 stops
Multiple Airlines Logo
5:30 pm - 1:25 pm
BRU
-
STL
26h 55m
1 stop
$868Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
12:10 pm - 1:15 pm
STL
-
BRU
18h 05m
2 stops
Multiple Airlines Logo
5:30 pm - 1:25 pm
BRU
-
STL
26h 55m
1 stop
$869Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
12:46 pm - 3:05 pm
STL
-
BRU
19h 19m
2 stops
Multiple Airlines Logo
7:05 pm - 10:00 pm
BRU
-
STL
33h 55m
2 stops
$870Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
12:10 pm - 7:10 am
STL
-
BRU
12h 00m
1 stop
Multiple Airlines Logo
2:25 pm - 1:25 pm
BRU
-
STL
30h 00m
1 stop
$871Multiple Airlines
Wed, Sep 30 - Mon, Oct 5
Multiple Airlines Logo
12:10 pm - 7:10 am
STL
-
BRU
12h 00m
1 stop
Multiple Airlines Logo
2:25 pm - 1:25 pm
BRU
-
STL
30h 00m
1 stop
$872Multiple Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to Brussels flights

Get data-powered insights and trends into flights from St. Louis to Brussels to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from St. Louis to Brussels?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Brussels departing in November.

What is the cheapest month to fly from St. Louis to Brussels?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Brussels, 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 Brussels is April, where tickets cost $414 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,282 and $1,053 respectively.

Good to know

Cheapest flight$337
Flight from St. Louis to Brussels Airport

When to book flights from St. Louis to Brussels

Are your dates flexible? Find out the best times to travel from St. Louis to Brussels based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Brussels

  • What is the cheapest flight from St. Louis to Brussels?

    In the last 5 days, the lowest price for a flight from St. Louis to Brussels was $337 for a one-way ticket and $746 for a round-trip.

  • Do I need a passport to fly between St. Louis and Brussels?

    A passport is required to fly from St. Louis to Brussels.

  • Which airports will I be using when flying from St. Louis to Brussels?

    St. Louis is served by only 1 airport and there are 2 airports in Brussels. You will leave St. Louis from Lambert-St Louis and you will be arriving in Brussels at one of these airports: Brussels Bruxelles-National or Charleroi Brussels.

  • Which aircraft models fly most regularly from St. Louis to Brussels?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Brussels?

    Star Alliance is the only airline alliance operating flights between St. Louis and Brussels.

  • How does KAYAK find such low prices on flights from St. Louis to Brussels?

    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 Brussels.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Brussels?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Brussels from St. Louis 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 Brussels?

    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 to Brussels with an airline and back to St. Louis with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Brussels?

    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 to Brussels from St. Louis 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 Brussels

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Brussels. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Brussels? 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 9896 reviews
7.3Comfort
7.1Entertainment
7.7Boarding
8.1Crew
6.6Food
Airline reviews

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

4.0 OkayManoj, May 2026
IAD - BRU
Read more United Airlines reviews

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

I had enough leg room. The check in was smooth. Good food

The boarding timing needs to be improved. The flight was delayed again because it took way too long to board. I was already exhausted from sleeping at the airport and spending all day there due to delay from my previous flight that connected in Chicago.

Fine not above and beyond as I had a connection that was delayed due to maintenance

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Overall a very poor experience - booked premium economy tickets but due to last minute flight delays , all my itinery went for a toss and had to fly economy class with no access to lounge or any compensation by united airlines to make up for the flight delays . i had expected better experience than that from united.

Onboarding - it would be great to see on the screen what group they were boarding. It was very confusing on who was boarding (even though they called it out) they were not clear and the space to board was strange.

Kayak, the site I went through to book our flight, sent very unclear emails about flight changes. Kayak was incredibly unhelpful in their communications with me about this, promising to work on resolving the issue, and failing to do so. As a result, I needed to get a hotel in Brussels and am now in the process of trying to get reimbursed. On the other hand, the flight personnel in Brussels were very helpful, taking time to look into the issue and determine if they could help. I am very grateful for them and have no problems with the airline. For Kayak, however, I will never use it again and will never recommend it to anyone, and will even discourage people who consider going through that site. My worst experience ever....

Older plane. Food was really bad, almost not worth the effort. Huge difference with European based airlines.

It started well but flight was cancelled and they created a nightmare rebooking. It is two days later and we still haven’t reached our destination. I am in Amsterdam waiting on transfer desk to open (later than other airlines) to hopefully get a boarding pass. Once that problem is solved we will just pray this flight isn’t cancelled too.

The flight was cancelled, so why are you asking me how the flight was?

We sat in our seats on the tarmac for almost 3 hours due to storms. They would not give us water or a snack. We were to depart at 7.30 pm and it was about 10.30 when we took off. No dinner until much after that. Beef type noodle dish was terrible with about a teaspoon of beef in it. The breakfast sweet waffle with egg and sausage inside was horrible. An English muffin sandwich would have been much better. Food was the worst in all of our years of traveling the world.

Our screen kept turning off ...3 times...had to get crew attention to turn it on again

Perfect airline, super friendly, great service, tasty food. Would fly again.

The flight was delayed more than 1.5 hours. Phone calls to united did not satisfy our need to get to Chicago to met family for fight to europe. I was told the flight was booked thru luftansa and united could not make adjustments. When call luftansa they were unaware of the significant delay on the united flight out of mci. They would not authorize a flight change. We went to the airport, as if we would be flying as scheduled, United checked us in, as if our flight would leave as scheduled. We took our bag to be checked to the baggage drop and the agent their confirmed our flight was significantly delayed. She worked for 30 min to get us on another flight. We ended up flying to Denver then to Munich. The rest of the family that flew to Chicago for our meet up and flight to Europe ended up flying to Munich alone. We meet up in Munich for our last leg to luxembourg. In luxembourg we learned on bag was scheduled on our delayed flight. The flight was canceled and we did not receive the bag in lux. We filed a lost back claim. Now 3 days later we STILL do not have the bag. It is apparently in luxembourg and they maybe tried to deliver, however the names on the door of the air b&b do not match the name on the baggage claim so the French speaking delivery person called no one could understand him so he took the bag and left. My brother, traveling with me under a different reservation , has been without essentials for 3 days. One or all of us has stayed "home" each day waiting on the bag. Today was my turn. Delivery window was 10:30 to 2:30. No attempt to knock or ring bell. After the hang up call, my brother called me and told me to check the door. There was nothing there. No sign of attempted delivery, no delivery man, nothing. Being unable to change clothes and having family members take turns waiting on a bag that never comes has ruined this family vacation. Thanks United/Luftansa

The flight left an hour late and no explanation. Food was basically a few snacks out of bags and tiny cup of soda. Crew was pretty friendly.

The The check in process was terrible on both ends. It was not clear if we should use the United, Lufthansa, or Aragrant number. It took over an hour to check in on the front end – and then at return the Lufthansa online check in failed multiple times and only after two calls to their phone number could we accomplish the task. The link to the Kayak site provided no access for check in. This difficulty and ambiguity on both ends will affect our interest in using Kayak for foreign travel in the future.

You lost my bag then waiting on the phone for 30 mins for customer service just to be directed to call another number

Boarding staff, crew and food needs a lot of improvement!! It was awful Aircraft was old with minimal legspace

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

Information on your arrival and departure airports