$408 Find Cheap Flights from St. Louis to Brussels

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 1/4. 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
$451
Overall average: $990
Lufthansa
Fri 1/16Wed 1/21
STL - BRU • 1 stop
Cheapest one-way
$408
Lufthansa
Sun 1/4
STL - BRU • 1 stop
Top airlines
Lufthansa
Cheapest • from $451 (round-trip)
United Airlines
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

Fri, Jan 16 - Wed, Jan 21
Lufthansa Logo
1:15 pm - 8:55 am
STL
-
BRU
12h 40m1 stop
Lufthansa Logo
6:45 am - 5:43 pm
BRU
-
STL
17h 58m2 stops
$451Lufthansa
Fri, Jan 16 - Wed, Jan 21
Lufthansa Logo
1:15 pm - 8:55 am
STL
-
BRU
12h 40m1 stop
Lufthansa Logo
10:10 am - 5:43 pm
BRU
-
STL
14h 33m1 stop
$458Lufthansa
Fri, Feb 6 - Tue, Feb 10
Air Canada Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
Air Canada Logo
10:00 am - 2:30 pm
BRU
-
STL
35h 30m2 stops
$461Air Canada
Fri, Feb 6 - Tue, Feb 10
United Airlines Logo
3:11 pm - 8:55 am
STL
-
BRU
10h 44m1 stop
United Airlines Logo
10:00 am - 11:02 am
BRU
-
STL
32h 02m2 stops
$463United Airlines
Fri, Jan 16 - Wed, Jan 21
Air Canada Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
Air Canada Logo
2:25 pm - 3:29 pm
BRU
-
STL
32h 04m2 stops
$480Air Canada
Fri, Feb 6 - Tue, Feb 10
United Airlines Logo
9:57 am - 8:55 am
STL
-
BRU
15h 58m1 stop
United Airlines Logo
11:15 am - 5:18 pm
BRU
-
STL
13h 03m1 stop
$482United Airlines
Thu, Jan 29 - Tue, Feb 3
United Airlines Logo
11:20 am - 1:15 pm
STL
-
BRU
18h 55m2 stops
United Airlines Logo
10:00 am - 2:30 pm
BRU
-
STL
35h 30m2 stops
$484United Airlines
Thu, Jan 29 - Tue, Feb 3
United Airlines Logo
4:05 pm - 8:55 am
STL
-
BRU
33h 50m2 stops
United Airlines Logo
10:00 am - 2:30 pm
BRU
-
STL
35h 30m2 stops
$486United Airlines
Tue, Jan 13 - Tue, Jan 20
Multiple Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m2 stops
Multiple Airlines Logo
11:15 am - 11:59 pm
BRU
-
STL
19h 44m1 stop
$501Multiple Airlines
Sun, May 3 - Sat, May 16
Multiple Airlines Logo
6:29 pm - 6:15 pm
STL
-
CRL
16h 46m2 stops
Multiple Airlines Logo
5:35 pm - 1:30 pm
CRL
-
STL
26h 55m2 stops
$2,503Multiple 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.

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

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

When flying from St. Louis to Brussels, you should consider leaving on a Friday and avoid Mondays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Fridays and the most expensive ones on Saturdays.

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 February, where tickets cost $690 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $2,205 and $1,234 respectively.

Good to know

Cheapest flight$408
Flight from St. Louis to Brussels

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 3 days, the lowest price for a flight from St. Louis to Brussels was $463 for a one-way ticket and $451 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 9072 reviews
8.1Crew
7.3Comfort
7.1Entertainment
7.7Boarding
6.6Food
Airline reviews

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.

8.0 ExcellentSteve, Dec 2025
DEN - YYZ
Read more United Airlines reviews

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

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Flight and crew were great. United didn't inform crew of immigration process which was disappointing!

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 Brussels

Information on your arrival and departure airports