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Cheap flights from St. Louis to Brussels from $342

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 10/14. 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

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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
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 - 11:09 amBRU  Brussels Bruxelles-National-STL Lambert-St Louis
32h 09m2 stops Montreal Pierre Elliott Trudeau Intl Newark
$732United Airlines
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
10:00 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
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
United Airlines Logo
11:25 am - 8:55 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
14h 30m1 stop Chicago O'Hare Intl
United Airlines Logo
10:00 am - 11:09 amBRU  Brussels Bruxelles-National-STL Lambert-St Louis
32h 09m2 stops Montreal Pierre Elliott Trudeau Intl Newark
$736United Airlines
Mon, Jan 25 - Thu, Jan 28
Multiple Airlines Logo
8:55 am - 7:50 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
15h 55m1 stop Toronto Pearson 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
$744Multiple Airlines
Mon, Sep 21 - Wed, Sep 30
Air Canada Logo
12:10 pm - 7:10 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
12h 00m1 stop Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
9:10 am - 8:20 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
18h 10m2 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
$763Air Canada
Mon, Sep 21 - Wed, Sep 30
Air Canada Logo
12:10 pm - 1:15 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
18h 05m2 stops Montreal Pierre Elliott Trudeau Intl London Heathrow
Air Canada Logo
9:10 am - 6:41 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
16h 31m1 stop Montreal Pierre Elliott Trudeau Intl
$768Air Canada
Mon, Sep 21 - Wed, Sep 30
Lufthansa Logo
1:29 pm - 11:50 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
15h 21m2 stops Chicago O'Hare Intl Frankfurt am Main
Lufthansa Logo
7:30 pm - 1:25 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
24h 55m1 stop Frankfurt am Main
$843Lufthansa
Wed, Sep 30 - Mon, Oct 5
Lufthansa Logo
3:40 pm - 10:10 amSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
11h 30m1 stop Frankfurt am Main
Lufthansa Logo
7:30 pm - 1:45 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
25h 15m1 stop Frankfurt am Main
$1,146Lufthansa
Sun, Dec 20 - Tue, Dec 29
Lufthansa Logo
3:30 pm - 5:30 pmSTL  Lambert-St Louis-BRU Brussels Bruxelles-National
19h 00m1 stop Frankfurt am Main
Lufthansa Logo
12:45 pm - 10:59 pmBRU  Brussels Bruxelles-National-STL Lambert-St Louis
17h 14m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
$2,158Lufthansa
Mon, Aug 24 - Sat, Sep 5

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United Airlines flights from St. Louis to Brussels

Our best United Airlines deals on St. Louis to Brussels 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
32h 09m
2 stops
STL11:09 amLambert-St Louis
$732
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

Lufthansa flights from St. Louis to Brussels

Our best Lufthansa deals on St. Louis to Brussels flight tickets
Lufthansa
Sep 30
STL1:29 pmLambert-St Louis
15h 21m
2 stops
BRU11:50 amBrussels Bruxelles-National
Oct 5
BRU7:30 pmBrussels Bruxelles-National
24h 55m
1 stop
STL1:25 pmLambert-St Louis
$843
Lufthansa
Dec 20
STL3:40 pmLambert-St Louis
11h 30m
1 stop
BRU10:10 amBrussels Bruxelles-National
Dec 29
BRU7:30 pmBrussels Bruxelles-National
25h 15m
1 stop
STL1:45 pmLambert-St Louis
$1,146
Lufthansa
Aug 24
STL3:30 pmLambert-St Louis
19h 00m
1 stop
BRU5:30 pmBrussels Bruxelles-National
Sep 5
BRU12:45 pmBrussels Bruxelles-National
17h 14m
2 stops
STL10:59 pmLambert-St Louis
$2,158

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 August 13, 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

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-11:09 am

2 stops32h 09m

$732

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

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

11:25 am-8:55 am

1 stop14h 30m

Brussels Bruxelles-National

Thu 1/28

10:00 am-11:09 am

2 stops32h 09m

$736

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 9/21

8:55 am-7:50 am

1 stop15h 55m

Brussels Bruxelles-National

Wed 9/30

9:10 am-6:41 pm

1 stop16h 31m

$744
Quickest round-trip

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-8:20 pm

2 stops18h 10m

$763

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 9/21

12:10 pm-1:15 pm

2 stops18h 05m

Brussels Bruxelles-National

Wed 9/30

9:10 am-6:41 pm

1 stop16h 31m

$768

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Wed 9/30

1:29 pm-11:50 am

2 stops15h 21m

Brussels Bruxelles-National

Mon 10/5

7:30 pm-1:25 pm

1 stop24h 55m

$843

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Sun 12/20

3:40 pm-10:10 am

1 stop11h 30m

Brussels Bruxelles-National

Tue 12/29

7:30 pm-1:45 pm

1 stop25h 15m

$1,146

St. LouisBrussels

STL Lambert-St Louis - BRU Brussels Bruxelles-National

STLBRU

Lambert-St Louis

Mon 8/24

3:30 pm-5:30 pm

1 stop19h 00m

Brussels Bruxelles-National

Sat 9/5

12:45 pm-10:59 pm

2 stops17h 14m

$2,158

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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.
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Frequently asked questions about flying from St. Louis to Brussels

  • 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
8,186 reviews
Search Lufthansa flights
United AirlinesPriceFrom $507Free CancellationRating
7.4
10,113 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