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Cheap flights from St. Louis to Brussels from $589

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 12/17. 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.
Air Canada Logo
12:10 pm - 7:10 am
STL
-
BRU
12h 00m
1 stop
Air Canada Logo
9:55 am - 8:20 pm
BRU
-
STL
17h 25m
1 stop
$757Air Canada
Mon, Sep 21 - Tue, Sep 29
Multiple Airlines Logo
12:10 pm - 1:15 pm
STL
-
BRU
18h 05m
2 stops
Multiple Airlines Logo
9:10 am - 6:41 pm
BRU
-
STL
16h 31m
1 stop
$758Multiple Airlines
Mon, Sep 21 - Tue, Sep 29
Air Canada Logo
12:10 pm - 8:00 pm
STL
-
BRU
24h 50m
2 stops
Air Canada Logo
9:10 am - 6:41 pm
BRU
-
STL
16h 31m
1 stop
$764Air Canada
Mon, Sep 21 - Tue, Sep 29
United Airlines Logo
8:30 am - 8:55 am
STL
-
BRU
17h 25m
1 stop
United Airlines Logo
9:45 am - 3:41 pm
BRU
-
STL
36h 56m
2 stops
$768United Airlines
Sun, Nov 29 - Wed, Dec 2
United Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m
2 stops
United Airlines Logo
9:45 am - 3:41 pm
BRU
-
STL
36h 56m
2 stops
$768United Airlines
Sun, Nov 29 - Wed, Dec 2
Multiple Airlines Logo
4:05 pm - 1:15 pm
STL
-
BRU
14h 10m
2 stops
Multiple Airlines Logo
8:25 am - 1:45 pm
BRU
-
STL
12h 20m
1 stop
$772Multiple Airlines
Tue, Nov 10 - Sun, Nov 15
United Airlines Logo
11:15 am - 8:55 am
STL
-
BRU
14h 40m
1 stop
United Airlines Logo
4:55 pm - 6:06 pm
BRU
-
STL
32h 11m
2 stops
$773United Airlines
Sun, Nov 29 - Wed, Dec 2
Lufthansa Logo
1:29 pm - 11:50 am
STL
-
BRU
15h 21m
2 stops
Lufthansa Logo
7:30 pm - 1:25 pm
BRU
-
STL
24h 55m
1 stop
$848Lufthansa
Wed, Sep 30 - Mon, Oct 5
Lufthansa Logo
1:29 pm - 11:50 am
STL
-
BRU
15h 21m
2 stops
Lufthansa Logo
7:30 pm - 1:25 pm
BRU
-
STL
24h 55m
1 stop
$849Lufthansa
Wed, Sep 30 - Mon, Oct 5
Lufthansa Logo
1:29 pm - 11:50 am
STL
-
BRU
15h 21m
2 stops
Lufthansa Logo
7:30 pm - 1:25 pm
BRU
-
STL
24h 55m
1 stop
$850Lufthansa
Wed, Sep 30 - Mon, Oct 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
Nov 29
STL4:05 pmLambert-St Louis
14h 10m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Dec 2
BRU9:45 amBrussels Bruxelles-National
36h 56m
2 stops
STL3:41 pmLambert-St Louis
$768
United Airlines
Nov 29
STL4:05 pmLambert-St Louis
14h 10m
2 stops
BRU1:15 pmBrussels Bruxelles-National
Dec 2
BRU4:55 pmBrussels Bruxelles-National
32h 11m
2 stops
STL6:06 pmLambert-St Louis
$773
United Airlines
Sep 21
STL12:10 pmLambert-St Louis
12h 00m
1 stop
BRU7:10 amBrussels Bruxelles-National
Sep 29
BRU9:10 amBrussels Bruxelles-National
34h 03m
2 stops
STL12:13 pmLambert-St Louis
$790

Air Canada flights from St. Louis to Brussels

Our best Air Canada deals on St. Louis to Brussels flight tickets
Air Canada
Sep 21
STL12:10 pmLambert-St Louis
12h 00m
1 stop
BRU7:10 amBrussels Bruxelles-National
Sep 29
BRU9:55 amBrussels Bruxelles-National
17h 25m
1 stop
STL8:20 pmLambert-St Louis
$757
Air Canada
Sep 21
STL12:10 pmLambert-St Louis
24h 50m
2 stops
BRU8:00 pmBrussels Bruxelles-National
Sep 29
BRU9:10 amBrussels Bruxelles-National
16h 31m
1 stop
STL6:41 pmLambert-St Louis
$764
Air Canada
Sep 21
STL8:55 amLambert-St Louis
15h 15m
2 stops
BRU7:10 amBrussels Bruxelles-National
Sep 29
BRU9:55 amBrussels Bruxelles-National
15h 46m
2 stops
STL6:41 pmLambert-St Louis
$774

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 2, 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

Mon 9/21

12:10 pm-7:10 am

1 stop12h 00m

Brussels Bruxelles-National

Tue 9/29

9:55 am-8:20 pm

1 stop17h 25m

$757

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 9/21

12:10 pm-1:15 pm

2 stops18h 05m

Brussels Bruxelles-National

Tue 9/29

9:10 am-6:41 pm

1 stop16h 31m

$758

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Mon 9/21

12:10 pm-8:00 pm

2 stops24h 50m

Brussels Bruxelles-National

Tue 9/29

9:10 am-6:41 pm

1 stop16h 31m

$764

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sun 11/29

8:30 am-8:55 am

1 stop17h 25m

Brussels Bruxelles-National

Wed 12/2

9:45 am-3:41 pm

2 stops36h 56m

$768

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sun 11/29

4:05 pm-1:15 pm

2 stops14h 10m

Brussels Bruxelles-National

Wed 12/2

9:45 am-3:41 pm

2 stops36h 56m

$768
Quickest round-trip

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Tue 11/10

4:05 pm-1:15 pm

2 stops14h 10m

Brussels Bruxelles-National

Sun 11/15

8:25 am-1:45 pm

1 stop12h 20m

$772

St. LouisBrussels

STL - BRU

STLBRU

Lambert-St Louis

Sun 11/29

11:15 am-8:55 am

1 stop14h 40m

Brussels Bruxelles-National

Wed 12/2

4:55 pm-6:06 pm

2 stops32h 11m

$773

St. LouisBrussels

STL - BRU

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

$848

St. LouisBrussels

STL - BRU

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

$849

St. LouisBrussels

STL - BRU

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

$850

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

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
8,174 reviews
Search Lufthansa flights
United AirlinesPriceFrom $507Free CancellationRating
7.4
10,062 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