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Cheap flights from St. Louis to Montreal from $148

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 Montreal departing on 10/30. 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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Cheap round-trip flights

Multiple Airlines Logo
12:20 pm - 4:28 pmSTL-YUL
27h 08m1 stop
Multiple Airlines Logo
4:35 pm - 8:45 amYUL-STL
17h 10m1 stop
$367Multiple Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
Multiple Airlines Logo
10:57 am - 3:10 pmSTL-YUL
27h 13m1 stop
Multiple Airlines Logo
2:30 pm - 1:57 pmYUL-STL
24h 27m2 stops
$376Multiple Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Multiple Airlines Logo
7:15 pm - 5:28 pmSTL-YUL
21h 13m1 stop
Multiple Airlines Logo
5:10 pm - 10:12 amYUL-STL
18h 02m2 stops
$402Multiple Airlines
Find Deal
Sat, Nov 1 - Sat, Nov 8
Multiple Airlines Logo
9:45 am - 12:30 amSTL-YUL
13h 45m1 stop
Multiple Airlines Logo
5:25 pm - 11:01 amYUL-STL
18h 36m2 stops
$404Multiple Airlines
Find Deal
Fri, Dec 5 - Sat, Dec 6
American Airlines Logo
7:16 am - 4:39 pmSTL-YUL
8h 23m1 stop
American Airlines Logo
3:52 pm - 11:56 pmYUL-STL
9h 04m1 stop
$408American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
American Airlines Logo
7:16 am - 4:39 pmSTL-YUL
8h 23m1 stop
American Airlines Logo
3:52 pm - 11:56 pmYUL-STL
9h 04m1 stop
$414American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
American Airlines Logo
4:34 pm - 11:40 amSTL-YUL
18h 06m1 stop
American Airlines Logo
7:30 am - 8:23 pmYUL-STL
13h 53m2 stops
$418American Airlines
Find Deal
Tue, Oct 21 - Wed, Nov 12
United Airlines Logo
5:00 am - 1:54 pmSTL-YUL
7h 54m1 stop
United Airlines Logo
8:20 am - 10:35 pmYUL-STL
15h 15m1 stop
$522United Airlines
Find Deal
Thu, Oct 16 - Sat, Oct 18
Delta Logo
6:00 am - 8:37 amSTL-YUL
25h 37m1 stop
Delta Logo
7:30 pm - 3:29 pmYUL-STL
20h 59m1 stop
$529Delta
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Sun, Oct 26 - Fri, Oct 31
United Airlines Logo
5:28 pm - 6:42 pmSTL-YUL
24h 14m1 stop
United Airlines Logo
6:35 am - 7:42 pmYUL-STL
14h 07m2 stops
$531United Airlines
Find Deal
Thu, Oct 16 - Sat, Oct 18

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

Our best Delta deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
Delta
Oct 26
STL6:00 amLambert-St Louis
25h 37m
1 stop
YUL8:37 amMontreal Pierre Elliott Trudeau Intl
Oct 31
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
20h 59m
1 stop
STL3:29 pmLambert-St Louis
$529
Find similar
Delta
Oct 1
STL6:05 amLambert-St Louis
9h 00m
1 stop
YUL4:05 pmMontreal Pierre Elliott Trudeau Intl
Oct 12
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
8h 22m
1 stop
STL1:22 pmLambert-St Louis
$704
Find similar
Delta
Oct 1
STL9:19 amLambert-St Louis
11h 38m
2 stops
YUL9:57 pmMontreal Pierre Elliott Trudeau Intl
Oct 12
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
4h 37m
1 stop
STL9:37 amLambert-St Louis
$713
Find similar

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

Our best American Airlines deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
American Airlines
Oct 30
STL7:16 amLambert-St Louis
8h 23m
1 stop
YUL4:39 pmMontreal Pierre Elliott Trudeau Intl
Nov 6
YUL3:52 pmMontreal Pierre Elliott Trudeau Intl
9h 04m
1 stop
STL11:56 pmLambert-St Louis
$408
Find similar
American Airlines
Oct 30
STL7:16 amLambert-St Louis
8h 23m
1 stop
YUL4:39 pmMontreal Pierre Elliott Trudeau Intl
Nov 6
YUL3:52 pmMontreal Pierre Elliott Trudeau Intl
9h 04m
1 stop
STL11:56 pmLambert-St Louis
$414
Find similar
American Airlines
Oct 21
STL4:34 pmLambert-St Louis
18h 06m
1 stop
YUL11:40 amMontreal Pierre Elliott Trudeau Intl
Nov 12
YUL7:30 amMontreal Pierre Elliott Trudeau Intl
13h 53m
2 stops
STL8:23 pmLambert-St Louis
$418
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport 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 September 17, 2025.
Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 12/4

12:20 pm-4:28 pm

1 stop27h 08m

Montreal Pierre Elliott Trudeau Intl

Sun 12/7

4:35 pm-8:45 am

1 stop17h 10m

$367

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 10/30

10:57 am-3:10 pm

1 stop27h 13m

Montreal Pierre Elliott Trudeau Intl

Thu 11/6

2:30 pm-1:57 pm

2 stops24h 27m

$376

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 11/1

7:15 pm-5:28 pm

1 stop21h 13m

Montreal Pierre Elliott Trudeau Intl

Sat 11/8

5:10 pm-10:12 am

2 stops18h 02m

$402

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 12/5

9:45 am-12:30 am

1 stop13h 45m

Montreal Pierre Elliott Trudeau Intl

Sat 12/6

5:25 pm-11:01 am

2 stops18h 36m

$404

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 10/30

7:16 am-4:39 pm

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

Thu 11/6

3:52 pm-11:56 pm

1 stop9h 04m

$408

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 10/30

7:16 am-4:39 pm

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

Thu 11/6

3:52 pm-11:56 pm

1 stop9h 04m

$414

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/21

4:34 pm-11:40 am

1 stop18h 06m

Montreal Pierre Elliott Trudeau Intl

Wed 11/12

7:30 am-8:23 pm

2 stops13h 53m

$418

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 10/16

5:00 am-1:54 pm

1 stop7h 54m

Montreal Pierre Elliott Trudeau Intl

Sat 10/18

8:20 am-10:35 pm

1 stop15h 15m

$522

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 10/26

6:00 am-8:37 am

1 stop25h 37m

Montreal Pierre Elliott Trudeau Intl

Fri 10/31

7:30 pm-3:29 pm

1 stop20h 59m

$529

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 10/16

5:28 pm-6:42 pm

1 stop24h 14m

Montreal Pierre Elliott Trudeau Intl

Sat 10/18

6:35 am-7:42 pm

2 stops14h 07m

$531

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 Montreal from

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

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 Montreal Pierre Elliott Trudeau Intl Airport?

The month of July is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from St. Louis averaging around $356.

What is the cheapest day to depart on your flight to Montreal Pierre Elliott Trudeau Intl Airport?

The cheapest day to depart from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is on a Tuesday. Travelers who choose to depart for Montreal Pierre Elliott Trudeau Intl Airport on a Tuesday will often find tickets for as low as $1,042. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,232. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Montreal Pierre Elliott Trudeau Intl Airport?

In the evening is the cheapest time of day to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport when you can find flight prices for as low as $282. Flying to Montreal Pierre Elliott Trudeau Intl Airport in the evening is an ideal time because this is during off-peak travel hours. Flights at noon are often more expensive with an average ticket price of $1,114.

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

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

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

There are 3 cabin classes available to choose from on Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl 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 St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights?

You could potentially save up to 6% on your flight if you consider stops on a St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight.

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

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

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

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

Best Price Found

$408

Fastest flight time

2h 30m

Direct flights

Mon, Tue, Wed, Thu and Sat
The best one-way flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in the past 72 hours is $408. The best round-trip flight deal from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport found on momondo in the last 72 hours is $704.
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 30m
Direct flights go from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on Monday, Tuesday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.
Search flight deals

  • How far is Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl by plane?

    There are 963.7 mi between Lambert-St Louis and Montreal Pierre Elliott Trudeau Intl. A reasonable flight in good conditions will take 7h 54m.

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

    Prices for flights from Lambert-St Louis Airport to Montreal Pierre Elliott Trudeau Intl Airport are updated daily.

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

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

  • What documentation or ID do you need to fly to Montreal Pierre Elliott Trudeau Intl Airport?

    The required travel and health documents for your Montreal Pierre Elliott Trudeau Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Montreal Pierre Elliott Trudeau Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

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

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

Compare and see reviews for airlines that fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $246Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
7,961 reviews
Search Delta flights
Air CanadaPriceFrom $282Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

  • United Airlines Flights From St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

    The lowest priced United Airlines flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from the last 72 hours was $246. Generally, United Airlines has 7 flights on this route every week with an average price of $765. United Airlines is rated 7.4/10 by our users.

  • Air Canada Flights From St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

    $282 is the best Air Canada flight deal from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport found on momondo over the last 72 hours. The average Air Canada ticket price found was closer to $692, however, with flight time and availability significantly affecting the price. Air Canada (7.1/10 from 10,000 user reviews) flies into Montreal Pierre Elliott Trudeau Intl Airport from St. Louis 7 times in an average week so prices can vary.

Traveling to a place near Montreal?

Book flights to Montreal if you plan to visit one of these locations
Laval
Longueuil
Dorval
Brossard
Magog
Trois-Rivières
Cornwall
Saint-Sauveur
Sherbrooke
Boucherville
Bromont
Drummondville
Montebello
Saint-Jean-sur-Richelieu
Sutton
North Hatley

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Montreal. momondo saves you time and could save you money on your trip.

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

All flight searches from St. Louis to Montreal on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential St. Louis to Montreal flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to Montreal from St. Louis. 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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