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Cheap flights from St. Louis to Brussels from $423

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 5/18. 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

Enter your travel dates to find the best prices.
United Airlines Logo
11:25 am - 1:15 pm
STL
-
BRU
19h 50m
2 stops
United Airlines Logo
10:00 am - 6:00 pm
BRU
-
STL
38h 00m
2 stops
$486United Airlines
Tue, Mar 17 - Tue, Mar 24
United Airlines Logo
7:00 pm - 7:55 am
STL
-
BRU
30h 55m
1 stop
United Airlines Logo
10:00 am - 6:00 pm
BRU
-
STL
38h 00m
2 stops
$489United Airlines
Tue, Mar 17 - Tue, Mar 24
United Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
15h 10m
2 stops
United Airlines Logo
10:00 am - 6:00 pm
BRU
-
STL
38h 00m
2 stops
$490United Airlines
Wed, Mar 18 - Wed, Mar 25
Lufthansa Logo
11:28 am - 1:10 pm
STL
-
BRU
19h 42m
2 stops
Lufthansa Logo
12:45 pm - 10:59 pm
BRU
-
STL
16h 14m
2 stops
$505Lufthansa
Wed, Mar 18 - Wed, Mar 25
British Airways Logo
4:30 pm - 7:10 pm
STL
-
BRU
19h 40m
2 stops
British Airways Logo
10:45 am - 11:56 pm
BRU
-
STL
20h 11m
2 stops
$510British Airways
Mon, Apr 27 - Fri, May 8
Lufthansa Logo
4:50 pm - 10:10 am
STL
-
BRU
11h 20m
1 stop
Lufthansa Logo
12:45 pm - 10:59 pm
BRU
-
STL
16h 14m
2 stops
$513Lufthansa
Wed, Mar 18 - Wed, Mar 25
United Airlines Logo
8:17 am - 7:55 am
STL
-
BRU
17h 38m
1 stop
United Airlines Logo
10:15 am - 9:07 pm
BRU
-
STL
16h 52m
2 stops
$514United Airlines
Wed, Mar 18 - Wed, Mar 25
Delta Logo
12:04 pm - 8:00 am
STL
-
BRU
13h 56m
1 stop
Delta Logo
2:45 pm - 9:05 am
BRU
-
STL
24h 20m
2 stops
$519Delta
Wed, Mar 18 - Wed, Mar 25
Multiple Airlines Logo
4:50 pm - 10:50 pm
STL
-
CRL
24h 00m
2 stops
Multiple Airlines Logo
12:25 pm - 1:25 pm
CRL
-
STL
32h 00m
2 stops
$870Multiple Airlines
Wed, Mar 25 - Tue, Mar 31
Multiple Airlines Logo
4:05 pm - 8:35 pm
STL
-
CRL
21h 30m
3 stops
Multiple Airlines Logo
8:45 am - 10:14 pm
CRL
-
STL
20h 29m
3 stops
$1,675Multiple Airlines
Mon, Apr 27 - Fri, May 8

United Airlines flights from St. Louis to Brussels

Our best United Airlines deals on St. Louis to Brussels flight tickets
United Airlines
Mar 17
STL11:25 amLambert-St Louis
19h 50m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Mar 24
BRU10:00 amBrussels Bruxelles-National
38h 00m
2 stops
STL6:00 pmLambert-St Louis
$486
United Airlines
Mar 17
STL7:00 pmLambert-St Louis
30h 55m
1 stop
BRU7:55 amBrussels Bruxelles-National
Mar 24
BRU10:00 amBrussels Bruxelles-National
38h 00m
2 stops
STL6:00 pmLambert-St Louis
$489
United Airlines
Mar 18
STL4:05 pmLambert-St Louis
15h 10m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Mar 25
BRU10:00 amBrussels Bruxelles-National
38h 00m
2 stops
STL6:00 pmLambert-St Louis
$490

Lufthansa flights from St. Louis to Brussels

Our best Lufthansa deals on St. Louis to Brussels flight tickets
Lufthansa
Mar 18
STL11:28 amLambert-St Louis
19h 42m
2 stops
BRU1:10 pmBrussels Bruxelles-National
Mar 25
BRU12:45 pmBrussels Bruxelles-National
16h 14m
2 stops
STL10:59 pmLambert-St Louis
$505
Lufthansa
Mar 18
STL4:50 pmLambert-St Louis
11h 20m
1 stop
BRU10:10 amBrussels Bruxelles-National
Mar 25
BRU12:45 pmBrussels Bruxelles-National
16h 14m
2 stops
STL10:59 pmLambert-St Louis
$513
Lufthansa
Mar 3
STL4:49 pmLambert-St Louis
22h 51m
2 stops
BRU10:40 pmBrussels Bruxelles-National
Mar 8
BRU7:00 amBrussels Bruxelles-National
13h 55m
1 stop
STL1:55 pmLambert-St Louis
$677

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 February 8, 2026.
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

Tue 3/17

11:25 am-1:15 pm

2 stops19h 50m

Brussels Bruxelles-National

Tue 3/24

10:00 am-6:00 pm

2 stops38h 00m

$486

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 3/17

7:00 pm-7:55 am

1 stop30h 55m

Brussels Bruxelles-National

Tue 3/24

10:00 am-6:00 pm

2 stops38h 00m

$489

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

4:05 pm-1:15 pm

2 stops15h 10m

Brussels Bruxelles-National

Wed 3/25

10:00 am-6:00 pm

2 stops38h 00m

$490

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

11:28 am-1:10 pm

2 stops19h 42m

Brussels Bruxelles-National

Wed 3/25

12:45 pm-10:59 pm

2 stops16h 14m

$505

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 4/27

4:30 pm-7:10 pm

2 stops19h 40m

Brussels Bruxelles-National

Fri 5/8

10:45 am-11:56 pm

2 stops20h 11m

$510

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

4:50 pm-10:10 am

1 stop11h 20m

Brussels Bruxelles-National

Wed 3/25

12:45 pm-10:59 pm

2 stops16h 14m

$513

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

8:17 am-7:55 am

1 stop17h 38m

Brussels Bruxelles-National

Wed 3/25

10:15 am-9:07 pm

2 stops16h 52m

$514

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 3/18

12:04 pm-8:00 am

1 stop13h 56m

Brussels Bruxelles-National

Wed 3/25

2:45 pm-9:05 am

2 stops24h 20m

$519

St. LouisBrussels

STL - CRL

STLCRL

Lambert-St Louis

Wed 3/25

4:50 pm-10:50 pm

2 stops24h 00m

Charleroi Brussels

Tue 3/31

12:25 pm-1:25 pm

2 stops32h 00m

$870

St. LouisBrussels

STL - CRL

STLCRL

Lambert-St Louis

Mon 4/27

4:05 pm-8:35 pm

3 stops21h 30m

Charleroi Brussels

Fri 5/8

8:45 am-10:14 pm

3 stops20h 29m

$1,675

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 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 $494. If you are unable to visit Brussels during the month of February, then departing from St. Louis during the month January is also very affordable. Most momondo users find prices during this month for around $657.

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

Fastest flight time

12h 00m

Direct flights

None
The fastest flight from St. Louis to Brussels takes 12h 00m
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 12h 00m.

  • 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
LufthansaPriceFrom $441Free CancellationRating
6.8
7,775 reviews
Search Lufthansa flights
United AirlinesPriceFrom $606Free CancellationRating
7.4
9,259 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