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Cheap flights from St. Louis to Brussels from $472

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 9/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Brussels

Cheap round-trip flights

Scandinavian Airlines Logo
4:00 pm - 2:30 pmSTL-BRU
15h 30m2 stops
Scandinavian Airlines Logo
10:20 am - 8:39 pmBRU-STL
17h 19m2 stops
$526Scandinavian Airlines
Find Deal
Mon, Jan 12 - Fri, Jan 23
United Airlines Logo
6:30 am - 8:55 amSTL-BRU
19h 25m1 stop
United Airlines Logo
10:00 am - 9:40 pmBRU-STL
42h 40m2 stops
$534United Airlines
Find Deal
Wed, Nov 12 - Thu, Nov 27
Logo
5:27 pm - 8:55 amSTL-BRU
32h 28m1 stop
Logo
10:00 am - 3:29 pmBRU-STL
36h 29m2 stops
$541
Find Deal
Tue, Dec 9 - Tue, Dec 23
Air Canada Logo
6:30 am - 7:50 amSTL-BRU
18h 20m2 stops
Air Canada Logo
10:00 am - 3:29 pmBRU-STL
36h 29m2 stops
$548Air Canada
Find Deal
Tue, Dec 9 - Tue, Dec 23
United Airlines Logo
9:57 am - 8:55 amSTL-BRU
15h 58m1 stop
United Airlines Logo
10:10 am - 9:13 pmBRU-STL
18h 03m1 stop
$556United Airlines
Find Deal
Mon, Jan 12 - Fri, Jan 23
Logo
10:00 am - 8:55 amSTL-BRU
15h 55m1 stop
Logo
7:30 pm - 1:55 pmBRU-STL
25h 25m1 stop
$579
Find Deal
Tue, Dec 9 - Tue, Dec 23
Air Canada Logo
1:30 pm - 8:05 amSTL-BRU
11h 35m1 stop
Air Canada Logo
10:00 am - 7:57 pmBRU-STL
16h 57m1 stop
$587Air Canada
Find Deal
Tue, Oct 7 - Tue, Oct 14
Lufthansa Logo
10:00 am - 8:55 amSTL-BRU
15h 55m1 stop
Lufthansa Logo
7:30 pm - 1:55 pmBRU-STL
25h 25m1 stop
$637Lufthansa
Find Deal
Wed, Nov 12 - Thu, Nov 27
American Airlines Logo
2:21 pm - 10:50 amSTL-BRU
13h 29m2 stops
American Airlines Logo
11:50 am - 11:32 pmBRU-STL
17h 42m3 stops
$641American Airlines
Find Deal
Tue, Mar 3 - Mon, Mar 9
Lufthansa Logo
3:30 pm - 10:10 amSTL-BRU
11h 40m1 stop
Lufthansa Logo
8:30 am - 3:44 pmBRU-STL
14h 14m2 stops
$1,805Lufthansa
Find Deal
Sun, Sep 28 - Thu, Oct 2

Scandinavian Airlines flights from St. Louis to Brussels

Our best Scandinavian Airlines deals on St. Louis to Brussels flight tickets
Scandinavian Airlines
Jan 12
STL4:00 pmLambert-St Louis
15h 30m
2 stops
BRU2:30 pmBrussels Bruxelles-National
Jan 23
BRU10:20 amBrussels Bruxelles-National
17h 19m
2 stops
STL8:39 pmLambert-St Louis
$526
Find similar
Scandinavian Airlines
Sep 22
STL1:26 pmLambert-St Louis
18h 54m
2 stops
BRU3:20 pmBrussels Bruxelles-National
Sep 26
BRU10:20 amBrussels Bruxelles-National
17h 55m
2 stops
STL9:15 pmLambert-St Louis
$1,640
Find similar

United Airlines flights from St. Louis to Brussels

Our best United Airlines deals on St. Louis to Brussels flight tickets
United Airlines
Nov 12
STL6:30 amLambert-St Louis
19h 25m
1 stop
BRU8:55 amBrussels Bruxelles-National
Nov 27
BRU10:00 amBrussels Bruxelles-National
42h 40m
2 stops
STL9:40 pmLambert-St Louis
$534
Find similar
United Airlines
Jan 12
STL9:57 amLambert-St Louis
15h 58m
1 stop
BRU8:55 amBrussels Bruxelles-National
Jan 23
BRU10:10 amBrussels Bruxelles-National
18h 03m
1 stop
STL9:13 pmLambert-St Louis
$556
Find similar
United Airlines
Jan 12
STL3:11 pmLambert-St Louis
15h 04m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Jan 23
BRU10:10 amBrussels Bruxelles-National
12h 53m
1 stop
STL4:03 pmLambert-St Louis
$560
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Brussels 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 September 11, 2025.
Use the filters below to find and compare flights from St. Louis to Brussels that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 1/12

4:00 pm-2:30 pm

2 stops15h 30m

Brussels Bruxelles-National

Fri 1/23

10:20 am-8:39 pm

2 stops17h 19m

$526

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 11/12

6:30 am-8:55 am

1 stop19h 25m

Brussels Bruxelles-National

Thu 11/27

10:00 am-9:40 pm

2 stops42h 40m

$534

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 12/9

5:27 pm-8:55 am

1 stop32h 28m

Brussels Bruxelles-National

Tue 12/23

10:00 am-3:29 pm

2 stops36h 29m

$541

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 12/9

6:30 am-7:50 am

2 stops18h 20m

Brussels Bruxelles-National

Tue 12/23

10:00 am-3:29 pm

2 stops36h 29m

$548

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 1/12

9:57 am-8:55 am

1 stop15h 58m

Brussels Bruxelles-National

Fri 1/23

10:10 am-9:13 pm

1 stop18h 03m

$556

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 12/9

10:00 am-8:55 am

1 stop15h 55m

Brussels Bruxelles-National

Tue 12/23

7:30 pm-1:55 pm

1 stop25h 25m

$579

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 10/7

1:30 pm-8:05 am

1 stop11h 35m

Brussels Bruxelles-National

Tue 10/14

10:00 am-7:57 pm

1 stop16h 57m

$587

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 11/12

10:00 am-8:55 am

1 stop15h 55m

Brussels Bruxelles-National

Thu 11/27

7:30 pm-1:55 pm

1 stop25h 25m

$637

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 3/3

2:21 pm-10:50 am

2 stops13h 29m

Brussels Bruxelles-National

Mon 3/9

11:50 am-11:32 pm

3 stops17h 42m

$641

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sun 9/28

3:30 pm-10:10 am

1 stop11h 40m

Brussels Bruxelles-National

Thu 10/2

8:30 am-3:44 pm

2 stops14h 14m

$1,805

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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See travel insights to Brussels from

How to get the cheapest flight ticket from St. Louis to Brussels

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 typical price of a round-trip flight between St. Louis and Brussels?

What is the cheapest month to fly to Brussels?

In general, February is the cheapest month to fly from St. Louis to Brussels. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $690. If you are unable to visit Brussels during the month of February, then departing from St. Louis during the month November is also very affordable. Most momondo users find prices during this month for around $705.

What is the cheapest day to depart on your flight to Brussels?

On average, the least expensive day to fly to Brussels from St. Louis is on a Friday. momondo users have found tickets for Friday departures for as low as $1,035. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,431.

What is the cheapest time of day to depart on your flight to Brussels?

According to our data, the cheapest time of day to fly to Brussels is in the afternoon. momondo users have found flights departing from St. Louis to Brussels in the afternoon for as low as $1,088. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $1,420.

Cheap St. Louis to Brussels flight deals and tips

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

Direct flights

None
There are no direct flights from St. Louis to Brussels. There are no popular flight routes from St. Louis to Brussels.
Search flight deals

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

    There are 4389.6 mi between Lambert-St Louis and Brussels. By plane, this route typically takes 10h 36m.

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

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

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

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

    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.

  • What documentation or ID do you need to fly to Brussels?

    The travel and health documents required for your trip to Brussels 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. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from St. Louis to Brussels

Compare and see reviews for airlines that fly from St. Louis to Brussels with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $657Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights

Why use momondo?

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

Finding the right flight to Brussels from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Brussels quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to Brussels from St. Louis with this policy.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Brussels.

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

If you are simply researching potential flights to Brussels, momondo offers a useful price alert feature which will track prices for flights to Brussels from St. Louis and alert you when they change.

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Find better results for your trip to Belgium

Fly into one of these airports located in Brussels

Airports listed have a maximum distance of 27.4 mi from Brussels
Brussels Bruxelles-National Airport
Charleroi Brussels Airport