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Cheap flights from St. Louis to Brussels from $344

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Brussels departing on 10/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Brussels

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
3:15 pm - 1:15 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
15h 00m2 stops Chicago O'Hare Intl London Heathrow
United Airlines Logo
10:00 am - 12:40 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
33h 40m2 stops Montreal Pierre Elliott Trudeau Intl Newark
$733United Airlines
Mon, Jan 25 - Thu, Jan 28
Air Canada Logo
4:05 pm - 1:15 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
38h 10m2 stops Toronto Pearson Intl London Heathrow
Air Canada Logo
10:00 am - 3:41 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
36h 41m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl
$735Air Canada
Mon, Jan 25 - Thu, Jan 28
United Airlines Logo
9:40 am - 8:55 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
16h 15m1 stop Chicago O'Hare Intl
United Airlines Logo
10:00 am - 12:40 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
33h 40m2 stops Montreal Pierre Elliott Trudeau Intl Newark
$736United Airlines
Mon, Jan 25 - Thu, Jan 28
Air Canada Logo
4:05 pm - 1:15 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
14h 10m2 stops Toronto Pearson Intl London Heathrow
Air Canada Logo
10:00 am - 2:30 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
35h 30m2 stops Montreal Pierre Elliott Trudeau Intl Chicago O'Hare Intl
$736Air Canada
Mon, Jan 25 - Thu, Jan 28
United Airlines Logo
3:15 pm - 1:15 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
15h 00m2 stops Chicago O'Hare Intl London Heathrow
United Airlines Logo
10:10 am - 3:41 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
12h 31m1 stop Chicago O'Hare Intl
$753United Airlines
Mon, Jan 25 - Thu, Jan 28
United Airlines Logo
1:08 pm - 8:55 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
12h 47m1 stop Chicago O'Hare Intl
United Airlines Logo
11:55 am - 6:38 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
13h 43m1 stop Washington, D.C. Dulles Intl
$756United Airlines
Mon, Jan 25 - Thu, Jan 28
Multiple Airlines Logo
12:10 pm - 7:10 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
12h 00m1 stop Montreal Pierre Elliott Trudeau Intl
Multiple Airlines Logo
9:10 am - 6:41 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
16h 31m1 stop Montreal Pierre Elliott Trudeau Intl
$764Multiple Airlines
Mon, Sep 21 - Wed, Sep 30
Lufthansa Logo
3:40 pm - 1:35 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
14h 55m1 stop Frankfurt am Main
Lufthansa Logo
7:00 am - 1:45 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
13h 45m1 stop Frankfurt am Main
$2,228Lufthansa
Sun, Dec 13 - Sun, Dec 27
Lufthansa Logo
3:40 pm - 10:10 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
11h 30m1 stop Frankfurt am Main
Lufthansa Logo
6:45 am - 9:22 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
21h 37m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
$2,230Lufthansa
Sun, Dec 13 - Sun, Dec 27
Lufthansa Logo
3:40 pm - 12:35 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
13h 55m1 stop Frankfurt am Main
Lufthansa Logo
12:45 pm - 9:18 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
15h 33m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
$2,230Lufthansa
Sun, Dec 13 - Sun, Dec 27

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Air Canada flights from St. Louis to Brussels Bruxelles-National Airport

Our best Air Canada deals on St. Louis to Brussels Bruxelles-National Airport flight tickets
Air Canada
Jan 25
STL4:05 pmLambert-St Louis
38h 10m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 28
BRU10:00 amBrussels Bruxelles-National
36h 41m
2 stops
STL3:41 pmLambert-St Louis
$735
Air Canada
Sep 21
STL12:10 pmLambert-St Louis
18h 05m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Sep 30
BRU9:10 amBrussels Bruxelles-National
16h 31m
1 stop
STL6:41 pmLambert-St Louis
$767
Air Canada
Sep 21
STL12:10 pmLambert-St Louis
18h 05m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Sep 30
BRU9:10 amBrussels Bruxelles-National
16h 31m
1 stop
STL6:41 pmLambert-St Louis
$768

United Airlines flights from St. Louis to Brussels Bruxelles-National Airport

Our best United Airlines deals on St. Louis to Brussels Bruxelles-National Airport flight tickets
United Airlines
Jan 25
STL3:15 pmLambert-St Louis
15h 00m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 28
BRU10:00 amBrussels Bruxelles-National
33h 40m
2 stops
STL12:40 pmLambert-St Louis
$733
United Airlines
Jan 25
STL9:40 amLambert-St Louis
16h 15m
1 stop
BRU8:55 amBrussels Bruxelles-National
Jan 28
BRU10:00 amBrussels Bruxelles-National
33h 40m
2 stops
STL12:40 pmLambert-St Louis
$736
United Airlines
Jan 25
STL3:15 pmLambert-St Louis
15h 00m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 28
BRU10:10 amBrussels Bruxelles-National
12h 31m
1 stop
STL3:41 pmLambert-St Louis
$753

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Brussels Bruxelles-National Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 17, 2026.
Use the filters below to find and compare flights from St. Louis to Brussels Bruxelles-National Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 1/25

3:15 pm-1:15 pm

2 stops15h 00m

Brussels Bruxelles-National

Thu 1/28

10:00 am-12:40 pm

2 stops33h 40m

$733

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 1/25

4:05 pm-1:15 pm

2 stops38h 10m

Brussels Bruxelles-National

Thu 1/28

10:00 am-3:41 pm

2 stops36h 41m

$735

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 1/25

9:40 am-8:55 am

1 stop16h 15m

Brussels Bruxelles-National

Thu 1/28

10:00 am-12:40 pm

2 stops33h 40m

$736

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 1/25

4:05 pm-1:15 pm

2 stops14h 10m

Brussels Bruxelles-National

Thu 1/28

10:00 am-2:30 pm

2 stops35h 30m

$736

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 1/25

3:15 pm-1:15 pm

2 stops15h 00m

Brussels Bruxelles-National

Thu 1/28

10:10 am-3:41 pm

1 stop12h 31m

$753
Quickest round-trip

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 1/25

1:08 pm-8:55 am

1 stop12h 47m

Brussels Bruxelles-National

Thu 1/28

11:55 am-6:38 pm

1 stop13h 43m

$756

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 9/21

12:10 pm-7:10 am

1 stop12h 00m

Brussels Bruxelles-National

Wed 9/30

9:10 am-6:41 pm

1 stop16h 31m

$764

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Sun 12/13

3:40 pm-1:35 pm

1 stop14h 55m

Brussels Bruxelles-National

Sun 12/27

7:00 am-1:45 pm

1 stop13h 45m

$2,228

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Sun 12/13

3:40 pm-10:10 am

1 stop11h 30m

Brussels Bruxelles-National

Sun 12/27

6:45 am-9:22 pm

2 stops21h 37m

$2,230

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Sun 12/13

3:40 pm-12:35 pm

1 stop13h 55m

Brussels Bruxelles-National

Sun 12/27

12:45 pm-9:18 pm

2 stops15h 33m

$2,230

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Brussels Bruxelles-National Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Brussels Bruxelles-National Airport?

The cheapest month to fly to Brussels Bruxelles-National Airport from St. Louis is in February. Flight prices, which tend to average around $494, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Brussels Bruxelles-National Airport from St. Louis during January instead. Flights to Brussels Bruxelles-National Airport in January, while not as cheap as those in February, still average around $657.

Can stopping save me money on St. Louis to Brussels Bruxelles-National Airport flights?

You could potentially save up to 43% on your flight if you consider stops on a St. Louis to Brussels Bruxelles-National Airport flight.

When to book flights from St. Louis to Brussels Bruxelles-National Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Brussels Bruxelles-National Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Brussels Bruxelles-National Airport (STL to BRU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Brussels Bruxelles-National Airport

Best Price Found

$344

Fastest flight time

15h 00m

Direct flights

None
The best one-way flight to Brussels Bruxelles-National Airport from St. Louis in the past 72 hours is $344. The best round-trip flight deal from St. Louis to Brussels Bruxelles-National Airport found on momondo in the last 72 hours is $733.
The fastest flight from St. Louis to Brussels Bruxelles-National Airport takes 15h 00m
There are no direct flights from St. Louis to Brussels Bruxelles-National Airport. There are no popular flight routes from St. Louis to Brussels Bruxelles-National Airport.
Search flight deals

Frequently asked questions about flying from St. Louis to Brussels Bruxelles-National Airport

  • How far is Lambert-St Louis to Brussels Bruxelles-National by plane?

    The straight-line distance from Lambert-St Louis to Brussels Bruxelles-National is 4393.0 mi. Flights usually cover this in 15h 00m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Brussels Bruxelles-National Airport?

    Prices for flights from Lambert-St Louis Airport to Brussels Bruxelles-National Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Brussels Bruxelles-National Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Brussels Bruxelles-National Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Brussels Bruxelles-National Airport.

  • What documentation or ID do you need to fly to Brussels Bruxelles-National Airport?

    The travel and health documents required for your trip to Brussels Bruxelles-National Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Brussels Bruxelles-National Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Brussels Bruxelles-National Airport?

Best airlines flying from St. Louis to Brussels Bruxelles-National Airport

Compare and see reviews for airlines that fly from St. Louis to Brussels Bruxelles-National Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $441Free CancellationRating
6.8
8,194 reviews
Search Lufthansa flights
United AirlinesPriceFrom $507Free CancellationRating
7.4
10,106 reviews
Search United Airlines flights

Traveling to a place near Brussels?

Book flights to Brussels if you plan to visit one of these locations
Bruges
Ghent
Leuven
Dinant
Mons
Durbuy
Zaventem
Charleroi
Genk
Aalst
Waterloo
Namur
Spa
Mechelen
Knokke-Heist
Hasselt
Francorchamps
Halle

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Brussels?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Brussels from St. Louis.

Can I find flights from St. Louis to Brussels with flexible booking policies on momondo?

momondo does allow users to show only those flights to Brussels from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Brussels?

Once all potential St. Louis to Brussels flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Brussels right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Brussels from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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