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Cheap flights from St. Louis to Brussels from $357

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.
1 adult
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.
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
Tue, May 5 - Tue, May 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
$766Finnair
Wed, May 6 - Wed, May 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
Wed, May 6 - Wed, May 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
Wed, May 6 - Wed, May 13
American Airlines Logo
9:35 pm - 8:25 pm
STL
-
BRU
15h 50m
1 stop
American Airlines Logo
7:05 am - 7:33 pm
BRU
-
STL
19h 28m
2 stops
$808American Airlines
Tue, May 5 - Tue, May 12
Multiple Airlines Logo
12:27 pm - 6:20 pm
STL
-
BRU
22h 53m
2 stops
Multiple Airlines Logo
6:30 am - 10:19 pm
BRU
-
STL
22h 49m
2 stops
$826Multiple Airlines
Thu, May 7 - Thu, May 14
Multiple Airlines Logo
12:43 pm - 6:20 pm
STL
-
BRU
22h 37m
2 stops
Multiple Airlines Logo
11:35 am - 11:59 pm
BRU
-
STL
19h 24m
2 stops
$840Multiple Airlines
Wed, Aug 26 - Sat, Dec 5
Air Canada Logo
1:05 pm - 1:15 pm
STL
-
BRU
17h 10m
2 stops
Air Canada Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$849Air Canada
Wed, May 13 - Thu, May 21
Air Canada Logo
1:05 pm - 7:10 am
STL
-
BRU
11h 05m
1 stop
Air Canada Logo
9:55 am - 8:25 pm
BRU
-
STL
17h 30m
1 stop
$853Air Canada
Wed, May 13 - Thu, May 21
Air Canada Logo
1:05 pm - 8:55 am
STL
-
BRU
36h 50m
2 stops
Air Canada Logo
9:55 am - 12:11 pm
BRU
-
STL
33h 16m
2 stops
$855Air Canada
Wed, May 13 - Thu, May 21

Finnair flights from St. Louis to Brussels

Our best Finnair deals on St. Louis to Brussels flight tickets
Finnair
May 5
STL5:21 pmLambert-St Louis
17h 59m
2 stops
BRU6:20 pmBrussels Bruxelles-National
May 12
BRU11:20 amBrussels Bruxelles-National
17h 59m
2 stops
STL10:19 pmLambert-St Louis
$765
Finnair
May 6
STL5:21 pmLambert-St Louis
17h 59m
2 stops
BRU6:20 pmBrussels Bruxelles-National
May 13
BRU11:20 amBrussels Bruxelles-National
17h 59m
2 stops
STL10:19 pmLambert-St Louis
$766
Finnair
May 6
STL5:21 pmLambert-St Louis
22h 14m
2 stops
BRU10:35 pmBrussels Bruxelles-National
May 13
BRU11:20 amBrussels Bruxelles-National
17h 59m
2 stops
STL10:19 pmLambert-St Louis
$770

American Airlines flights from St. Louis to Brussels

Our best American Airlines deals on St. Louis to Brussels flight tickets
American Airlines
May 5
STL9:35 pmLambert-St Louis
15h 50m
1 stop
BRU8:25 pmBrussels Bruxelles-National
May 12
BRU7:05 amBrussels Bruxelles-National
19h 28m
2 stops
STL7:33 pmLambert-St Louis
$808
American Airlines
Aug 26
STL9:35 pmLambert-St Louis
10h 30m
1 stop
BRU3:05 pmBrussels Bruxelles-National
Dec 5
BRU9:55 amBrussels Bruxelles-National
18h 57m
2 stops
STL9:52 pmLambert-St Louis
$1,052

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 March 25, 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 - BRU

STLBRU

Lambert-St Louis

Tue 5/5

5:21 pm-6:20 pm

2 stops17h 59m

Brussels Bruxelles-National

Tue 5/12

11:20 am-10:19 pm

2 stops17h 59m

$765

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 5/6

5:21 pm-6:20 pm

2 stops17h 59m

Brussels Bruxelles-National

Wed 5/13

11:20 am-10:19 pm

2 stops17h 59m

$766

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 5/6

5:21 pm-10:35 pm

2 stops22h 14m

Brussels Bruxelles-National

Wed 5/13

11:20 am-10:19 pm

2 stops17h 59m

$770

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 5/6

7:05 am-6:20 pm

2 stops28h 15m

Brussels Bruxelles-National

Wed 5/13

11:20 am-11:56 pm

2 stops19h 36m

$771

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 5/5

9:35 pm-8:25 pm

1 stop15h 50m

Brussels Bruxelles-National

Tue 5/12

7:05 am-7:33 pm

2 stops19h 28m

$808

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Thu 5/7

12:27 pm-6:20 pm

2 stops22h 53m

Brussels Bruxelles-National

Thu 5/14

6:30 am-10:19 pm

2 stops22h 49m

$826

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 8/26

12:43 pm-6:20 pm

2 stops22h 37m

Brussels Bruxelles-National

Sat 12/5

11:35 am-11:59 pm

2 stops19h 24m

$840

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 5/13

1:05 pm-1:15 pm

2 stops17h 10m

Brussels Bruxelles-National

Thu 5/21

9:55 am-8:25 pm

1 stop17h 30m

$849
Quickest round-trip

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 5/13

1:05 pm-7:10 am

1 stop11h 05m

Brussels Bruxelles-National

Thu 5/21

9:55 am-8:25 pm

1 stop17h 30m

$853

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Wed 5/13

1:05 pm-8:55 am

2 stops36h 50m

Brussels Bruxelles-National

Thu 5/21

9:55 am-12:11 pm

2 stops33h 16m

$855

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 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 $494. If you are unable to visit Brussels during the month of February, then departing from St. Louis during the month April is also very affordable. Most momondo users find prices during this month for around $606.

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

13h 49m

Direct flights

None
The fastest flight from St. Louis to Brussels takes 13h 49m
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 13h 49m.

  • 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
7,870 reviews
Search Lufthansa flights
United AirlinesPriceFrom $606Free CancellationRating
7.4
9,484 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.

An easier way to manage your Brussels trip

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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