$357 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 9/20. 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
$759
Overall average: $832
British Airways, Iberia
dom 5/3mar 5/12
STL - BRU • 1 stop
Cheapest one-way
$357
British Airways
dom 9/20
STL - BRU • 1 stop
Top airlines
Cheapest • from $762 (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

dom, mag 3 - mar, mag 12
Multiple Airlines Logo
9:40 pm - 8:00 pm
STL
-
BRU
15h 20m
1 stop
Multiple Airlines Logo
7:05 am - 10:19 pm
BRU
-
STL
22h 14m
2 stops
$759Multiple Airlines
dom, mag 3 - mar, mag 12
British Airways Logo
4:30 pm - 2:10 pm
STL
-
BRU
14h 40m
2 stops
British Airways Logo
10:55 am - 7:33 pm
BRU
-
STL
15h 38m
2 stops
$762British Airways
mar, mag 5 - mar, mag 12
Finnair Logo
5:21 pm - 6:20 pm
STL
-
BRU
17h 59m
2 stops
Finnair Logo
11:20 am - 10:19 pm
BRU
-
STL
17h 59m
2 stops
$765Finnair
dom, mag 3 - mar, mag 12
Multiple Airlines Logo
5:21 pm - 10:35 pm
STL
-
BRU
22h 14m
2 stops
Multiple Airlines Logo
6:30 am - 11:56 pm
BRU
-
STL
24h 26m
2 stops
$766Multiple Airlines
mer, mag 6 - mer, mag 13
Finnair Logo
5:21 pm - 10:35 pm
STL
-
BRU
22h 14m
2 stops
Finnair Logo
11:20 am - 10:19 pm
BRU
-
STL
17h 59m
2 stops
$770Finnair
mer, mag 6 - mer, mag 13
Multiple Airlines Logo
7:05 am - 6:20 pm
STL
-
BRU
28h 15m
2 stops
Multiple Airlines Logo
11:20 am - 11:56 pm
BRU
-
STL
19h 36m
2 stops
$771Multiple Airlines
lun, mag 4 - lun, mag 11
Finnair Logo
5:21 pm - 10:35 pm
STL
-
BRU
22h 14m
2 stops
Finnair Logo
7:05 pm - 7:30 pm
BRU
-
STL
31h 25m
2 stops
$774Finnair
dom, mag 3 - mar, mag 12
British Airways Logo
9:40 pm - 8:00 pm
STL
-
BRU
15h 20m
1 stop
British Airways Logo
7:55 pm - 7:30 pm
BRU
-
STL
30h 35m
1 stop
$807British Airways
dom, mag 3 - mar, mag 12
British Airways Logo
9:40 pm - 8:00 pm
STL
-
BRU
15h 20m
1 stop
British Airways Logo
7:55 pm - 7:30 pm
BRU
-
STL
30h 35m
1 stop
$808British Airways
gio, mag 7 - mar, mag 12
Multiple Airlines Logo
5:21 pm - 6:20 pm
STL
-
BRU
17h 59m
2 stops
Multiple Airlines Logo
11:20 am - 10:19 pm
BRU
-
STL
17h 59m
2 stops
$818Multiple 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 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 $494 (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 $1,282 respectively.

Good to know

Cheapest flight$357
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 3 days, the lowest price for a flight from St. Louis to Brussels was $357 for a one-way ticket and $759 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 9469 reviews
7.1Entertainment
7.3Comfort
8.1Crew
7.7Boarding
6.6Food
Airline reviews

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

2.0 MediocreJenny, Mar 2026
BWI - SFO
Read more United Airlines reviews

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

No seat back entertainment. And app had a hard time getting entertainment loaded.

ticket agent lady wás very helpful , she arranged wheel chair for my elderly mother

Didn't make the flight because the first leg of my flight was canceled and the next leg was already booked.

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

Experience was great - no complaints. Took off on time, landed early. Got to the gate relatively quickly - took a little bit of extra time to deplane but nothing excessive.

Business class seats felt very cramped compared to other airlines.

Economy plus was so cramped I could not use my laptop. It was beyond bad.

OK, we were delayed and had to de plane and reboard.

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 Brussels

Information on your arrival and departure airports