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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from $251

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis departing on 2/19. 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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Find the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
3:45 pm - 9:27 amYUL-STL
18h 42m1 stop
American Airlines Logo
6:04 am - 3:00 pmSTL-YUL
7h 56m1 stop
$251American Airlines
Find Deal
Thu, Feb 19 - Mon, Feb 23
American Airlines Logo
10:05 am - 9:44 pmYUL-STL
12h 39m2 stops
American Airlines Logo
6:04 am - 3:00 pmSTL-YUL
7h 56m1 stop
$260American Airlines
Find Deal
Thu, Feb 19 - Mon, Feb 23
United Airlines Logo
8:00 pm - 3:46 pmYUL-STL
20h 46m2 stops
United Airlines Logo
6:30 am - 3:57 pmSTL-YUL
8h 27m1 stop
$460United Airlines
Find Deal
Wed, Nov 12 - Wed, Nov 19
United Airlines Logo
4:45 pm - 3:46 pmYUL-STL
24h 01m1 stop
United Airlines Logo
5:24 pm - 3:57 pmSTL-YUL
21h 33m1 stop
$474United Airlines
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Wed, Nov 5 - Wed, Nov 12
Multiple Airlines Logo
5:25 pm - 11:57 pmYUL-STL
31h 32m2 stops
Multiple Airlines Logo
3:30 pm - 12:30 amSTL-YUL
8h 00m1 stop
$481Multiple Airlines
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Sun, Nov 30 - Sun, Dec 7
Multiple Airlines Logo
4:35 pm - 10:33 pmYUL-STL
30h 58m1 stop
Multiple Airlines Logo
10:40 am - 12:30 amSTL-YUL
12h 50m1 stop
$550Multiple Airlines
Find Deal
Tue, Dec 23 - Mon, Dec 29
Delta Logo
6:20 pm - 11:42 pmYUL-STL
6h 22m1 stop
Delta Logo
5:13 pm - 11:59 pmSTL-YUL
5h 46m1 stop
$551Delta
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Tue, Dec 23 - Tue, Dec 30
Delta Logo
6:20 pm - 11:42 pmYUL-STL
6h 22m1 stop
Delta Logo
5:13 pm - 11:59 pmSTL-YUL
5h 46m1 stop
$573Delta
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Sun, Dec 21 - Mon, Dec 29
Air Canada Logo
8:50 am - 3:29 pmYUL-STL
7h 39m2 stops
Air Canada Logo
8:00 am - 2:00 pmSTL-YUL
5h 00m1 stop
$611Air Canada
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Fri, Nov 14 - Sun, Nov 16
Air Canada Logo
8:50 am - 3:29 pmYUL-STL
7h 39m2 stops
Air Canada Logo
6:30 am - 3:16 pmSTL-YUL
7h 46m2 stops
$621Air Canada
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Fri, Nov 14 - Sun, Nov 16

United Airlines flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best United Airlines deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
United Airlines
Nov 12
YUL8:00 pmMontreal Pierre Elliott Trudeau Intl
20h 46m
2 stops
STL3:46 pmLambert-St Louis
Nov 19
STL6:30 amLambert-St Louis
8h 27m
1 stop
YUL3:57 pmMontreal Pierre Elliott Trudeau Intl
$460
Find similar
United Airlines
Nov 5
YUL4:45 pmMontreal Pierre Elliott Trudeau Intl
24h 01m
1 stop
STL3:46 pmLambert-St Louis
Nov 12
STL5:24 pmLambert-St Louis
21h 33m
1 stop
YUL3:57 pmMontreal Pierre Elliott Trudeau Intl
$474
Find similar
United Airlines
Nov 4
YUL6:15 pmMontreal Pierre Elliott Trudeau Intl
22h 34m
1 stop
STL3:49 pmLambert-St Louis
Nov 19
STL6:30 amLambert-St Louis
8h 27m
1 stop
YUL3:57 pmMontreal Pierre Elliott Trudeau Intl
$501
Find similar

WestJet flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best WestJet deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
WestJet
Nov 5
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
10h 25m
2 stops
STL4:10 pmLambert-St Louis
Nov 12
STL1:55 pmLambert-St Louis
9h 48m
2 stops
YUL12:43 amMontreal Pierre Elliott Trudeau Intl
$642
Find similar
WestJet
Nov 5
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
10h 10m
1 stop
STL4:10 pmLambert-St Louis
Nov 12
STL1:35 pmLambert-St Louis
10h 08m
2 stops
YUL12:43 amMontreal Pierre Elliott Trudeau Intl
$658
Find similar
WestJet
Dec 22
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
11h 01m
1 stop
STL5:01 pmLambert-St Louis
Dec 30
STL5:59 pmLambert-St Louis
4h 20m
1 stop
YUL11:19 pmMontreal Pierre Elliott Trudeau Intl
$674
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momondo Fare Finder

 
Customize your flight search to find flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis 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 October 16, 2025.
Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 2/19

3:45 pm-9:27 am

1 stop18h 42m

Lambert-St Louis

Mon 2/23

6:04 am-3:00 pm

1 stop7h 56m

$251

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 2/19

10:05 am-9:44 pm

2 stops12h 39m

Lambert-St Louis

Mon 2/23

6:04 am-3:00 pm

1 stop7h 56m

$260

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/12

8:00 pm-3:46 pm

2 stops20h 46m

Lambert-St Louis

Wed 11/19

6:30 am-3:57 pm

1 stop8h 27m

$460

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/5

4:45 pm-3:46 pm

1 stop24h 01m

Lambert-St Louis

Wed 11/12

5:24 pm-3:57 pm

1 stop21h 33m

$474

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 11/30

5:25 pm-11:57 pm

2 stops31h 32m

Lambert-St Louis

Sun 12/7

3:30 pm-12:30 am

1 stop8h 00m

$481

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 12/23

4:35 pm-10:33 pm

1 stop30h 58m

Lambert-St Louis

Mon 12/29

10:40 am-12:30 am

1 stop12h 50m

$550

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 12/23

6:20 pm-11:42 pm

1 stop6h 22m

Lambert-St Louis

Tue 12/30

5:13 pm-11:59 pm

1 stop5h 46m

$551

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 12/21

6:20 pm-11:42 pm

1 stop6h 22m

Lambert-St Louis

Mon 12/29

5:13 pm-11:59 pm

1 stop5h 46m

$573

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

8:50 am-3:29 pm

2 stops7h 39m

Lambert-St Louis

Sun 11/16

8:00 am-2:00 pm

1 stop5h 00m

$611

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

8:50 am-3:29 pm

2 stops7h 39m

Lambert-St Louis

Sun 11/16

6:30 am-3:16 pm

2 stops7h 46m

$621

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

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 St. Louis?

In general, May is the cheapest month to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $448. The month of April is another great option to travel to St. Louis, with average flight prices from Montreal Pierre Elliott Trudeau Intl Airport averaging around $485.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $246. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $609. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $435 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $593 per ticket.

What is the cheapest Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis for the best Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis flight prices

What cabin class options are available on Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flights?

There are 3 cabin classes available to choose from on Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flights?

You could potentially save up to 20% on your flight if you consider stops on a Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (YUL to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Direct flights

None
There are no direct flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis. There are no popular flight routes from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis.
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  • How far is Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis by plane?

    A flight from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis will travel around 963.7 mi. Flights usually cover this in 6h 22m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

    Prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

  • What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $435Free CancellationRating
7.1
10,307 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
7.9
7,980 reviews
Search Delta flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Wentzville
Collinsville
Fenton
St. Peters
Alton
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Montreal.

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

momondo does allow users to show only those flights to St. Louis from Montreal which offer a flexible booking policy as well as other useful filters and features.

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

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 Montreal to St. Louis.

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

Yes momondo offers price alerts on flights to St. Louis from Montreal. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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