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Cheap flights from St. Louis to Montreal from $109

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 2/3. 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

Enter your travel dates to find the best prices.
Multiple Airlines Logo
10:09 pm - 7:05 am
STL
-
YUL
31h 56m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$308Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
Multiple Airlines Logo
8:22 pm - 3:10 pm
STL
-
YUL
17h 48m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$346Multiple Airlines
Wed, Jan 21 - Sun, Jan 25
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
6:45 am - 11:11 am
YUL
-
STL
29h 26m2 stops
$349Multiple Airlines
Sun, Jan 18 - Fri, Jan 23
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
8:00 am - 11:33 pm
YUL
-
STL
40h 33m2 stops
$351Multiple Airlines
Sun, Jan 18 - Wed, Jan 28
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$369Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
Multiple Airlines Logo
5:42 pm - 12:43 am
STL
-
YUL
30h 01m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$388Multiple Airlines
Tue, Jan 20 - Sun, Jan 25
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
6:45 am - 11:33 pm
YUL
-
STL
17h 48m2 stops
$393Multiple Airlines
Sun, Jan 18 - Mon, Jan 26
Multiple Airlines Logo
1:35 pm - 7:05 am
STL
-
YUL
16h 30m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$402Multiple Airlines
Fri, Jan 16 - Sun, Jan 25
American Airlines Logo
6:00 am - 3:08 pm
STL
-
YUL
8h 08m1 stop
American Airlines Logo
3:50 pm - 9:34 am
YUL
-
STL
18h 44m1 stop
$422American Airlines
Wed, Feb 4 - Wed, Feb 11
Multiple Airlines Logo
1:35 pm - 7:05 am
STL
-
YUL
16h 30m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$424Multiple Airlines
Thu, Jan 15 - Sun, Jan 25

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
Feb 4
STL6:00 amLambert-St Louis
8h 08m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Feb 11
YUL3:50 pmMontreal Pierre Elliott Trudeau Intl
18h 44m
1 stop
STL9:34 amLambert-St Louis
$422
Find similar
American Airlines
Feb 26
STL6:33 pmLambert-St Louis
19h 32m
1 stop
YUL3:05 pmMontreal Pierre Elliott Trudeau Intl
Mar 2
YUL3:55 pmMontreal Pierre Elliott Trudeau Intl
18h 34m
1 stop
STL9:29 amLambert-St Louis
$427
Find similar
American Airlines
Jan 18
STL6:44 pmLambert-St Louis
19h 24m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Jan 25
YUL3:50 pmMontreal Pierre Elliott Trudeau Intl
19h 30m
1 stop
STL10:20 amLambert-St Louis
$537
Find similar

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
Jan 20
STL5:32 pmLambert-St Louis
14h 12m
1 stop
YUL8:44 amMontreal Pierre Elliott Trudeau Intl
Jan 28
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
11h 32m
1 stop
STL8:06 pmLambert-St Louis
$514
Find similar
Delta
Jan 18
STL1:05 pmLambert-St Louis
18h 39m
1 stop
YUL8:44 amMontreal Pierre Elliott Trudeau Intl
Jan 27
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
14h 04m
1 stop
STL8:34 amLambert-St Louis
$540
Find similar
Delta
Jan 17
STL1:20 pmLambert-St Louis
23h 02m
1 stop
YUL1:22 pmMontreal Pierre Elliott Trudeau Intl
Jan 24
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
8h 57m
1 stop
STL5:31 pmLambert-St Louis
$542
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 December 21, 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

Sun 1/18

10:09 pm-7:05 am

2 stops31h 56m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$308

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 1/21

8:22 pm-3:10 pm

2 stops17h 48m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$346

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

6:45 am-11:11 am

2 stops29h 26m

$349

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Wed 1/28

8:00 am-11:33 pm

2 stops40h 33m

$351

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$369

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

5:42 pm-12:43 am

2 stops30h 01m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$388

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Mon 1/26

6:45 am-11:33 pm

2 stops17h 48m

$393

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 1/16

1:35 pm-7:05 am

2 stops16h 30m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$402

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 2/4

6:00 am-3:08 pm

1 stop8h 08m

Montreal Pierre Elliott Trudeau Intl

Wed 2/11

3:50 pm-9:34 am

1 stop18h 44m

$422

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 1/15

1:35 pm-7:05 am

2 stops16h 30m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$424

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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 May is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from St. Louis averaging around $576.

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 $1,026. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,193. 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 $1,089.

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?

No. A direct flight is the cheapest option for a flight between St. Louis to Montreal Pierre Elliott Trudeau Intl Airport.

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

$366

Fastest flight time

2h 35m

Direct flights

Thu and Sat
The best one-way flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in the past 72 hours is $366. 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 $724.
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 35m
Direct flights go from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on 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 2h 35m.

  • 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
9,100 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,017 reviews
Search Delta flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,550 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights

Traveling to a place near Montreal?

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

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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