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Cheap flights from St. Louis to Montreal from $184

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 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.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
8:01 pm - 3:08 pmSTL-YUL
18h 07m1 stop
American Airlines Logo
7:30 am - 6:13 pmYUL-STL
11h 43m2 stops
$363American Airlines
Find Deal
Mon, Jan 5 - Sat, Jan 10
Multiple Airlines Logo
3:30 pm - 12:30 amSTL-YUL
8h 00m1 stop
Multiple Airlines Logo
8:00 am - 10:33 pmYUL-STL
15h 33m2 stops
$384Multiple Airlines
Find Deal
Sat, Dec 13 - Mon, Dec 15
American Airlines Logo
2:19 pm - 3:05 pmSTL-YUL
23h 46m1 stop
American Airlines Logo
3:55 pm - 1:49 pmYUL-STL
22h 54m1 stop
$414American Airlines
Find Deal
Tue, Feb 17 - Thu, Feb 19
American Airlines Logo
6:00 am - 3:05 pmSTL-YUL
8h 05m1 stop
American Airlines Logo
7:12 am - 11:30 pmYUL-STL
17h 18m2 stops
$424American Airlines
Find Deal
Tue, Feb 17 - Thu, Feb 19
American Airlines Logo
8:01 pm - 3:08 pmSTL-YUL
18h 07m1 stop
American Airlines Logo
3:52 pm - 10:21 amYUL-STL
19h 29m1 stop
$425American Airlines
Find Deal
Mon, Jan 5 - Sat, Jan 10
Delta Logo
7:05 am - 6:54 pmSTL-YUL
10h 49m2 stops
Delta Logo
9:34 am - 8:45 pmYUL-STL
12h 11m2 stops
$596Delta
Find Deal
Mon, Dec 15 - Tue, Jan 6
United Airlines Logo
3:19 pm - 3:57 pmSTL-YUL
23h 38m1 stop
United Airlines Logo
9:25 am - 10:43 pmYUL-STL
14h 18m1 stop
$601United Airlines
Find Deal
Mon, Dec 15 - Mon, Dec 22
Delta Logo
6:39 am - 6:54 pmSTL-YUL
11h 15m2 stops
Delta Logo
9:34 am - 8:45 pmYUL-STL
12h 11m2 stops
$612Delta
Find Deal
Mon, Dec 15 - Tue, Jan 6
Air Canada Logo
4:05 pm - 11:22 pmSTL-YUL
6h 17m1 stop
Air Canada Logo
10:10 am - 3:29 pmYUL-STL
6h 19m1 stop
$626Air Canada
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Mon, Dec 1 - Sun, Dec 7
Air Canada Logo
4:05 pm - 12:32 amSTL-YUL
7h 27m1 stop
Air Canada Logo
8:50 am - 3:29 pmYUL-STL
7h 39m2 stops
$657Air Canada
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Mon, Dec 1 - Sun, Dec 7

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
Jan 5
STL8:01 pmLambert-St Louis
18h 07m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Jan 10
YUL7:30 amMontreal Pierre Elliott Trudeau Intl
11h 43m
2 stops
STL6:13 pmLambert-St Louis
$363
Find similar
American Airlines
Feb 17
STL2:19 pmLambert-St Louis
23h 46m
1 stop
YUL3:05 pmMontreal Pierre Elliott Trudeau Intl
Feb 19
YUL3:55 pmMontreal Pierre Elliott Trudeau Intl
22h 54m
1 stop
STL1:49 pmLambert-St Louis
$414
Find similar
American Airlines
Feb 17
STL6:00 amLambert-St Louis
8h 05m
1 stop
YUL3:05 pmMontreal Pierre Elliott Trudeau Intl
Feb 19
YUL7:12 amMontreal Pierre Elliott Trudeau Intl
17h 18m
2 stops
STL11:30 pmLambert-St Louis
$424
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
Dec 15
STL7:05 amLambert-St Louis
10h 49m
2 stops
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Jan 6
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 pmLambert-St Louis
$596
Find similar
Delta
Dec 15
STL6:39 amLambert-St Louis
11h 15m
2 stops
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Jan 6
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 pmLambert-St Louis
$612
Find similar
Delta
Dec 15
STL9:50 amLambert-St Louis
8h 04m
1 stop
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Jan 6
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 pmLambert-St Louis
$619
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 November 2, 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

Mon 1/5

8:01 pm-3:08 pm

1 stop18h 07m

Montreal Pierre Elliott Trudeau Intl

Sat 1/10

7:30 am-6:13 pm

2 stops11h 43m

$363

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 12/13

3:30 pm-12:30 am

1 stop8h 00m

Montreal Pierre Elliott Trudeau Intl

Mon 12/15

8:00 am-10:33 pm

2 stops15h 33m

$384

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

2:19 pm-3:05 pm

1 stop23h 46m

Montreal Pierre Elliott Trudeau Intl

Thu 2/19

3:55 pm-1:49 pm

1 stop22h 54m

$414

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

6:00 am-3:05 pm

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Thu 2/19

7:12 am-11:30 pm

2 stops17h 18m

$424

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 1/5

8:01 pm-3:08 pm

1 stop18h 07m

Montreal Pierre Elliott Trudeau Intl

Sat 1/10

3:52 pm-10:21 am

1 stop19h 29m

$425

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/15

7:05 am-6:54 pm

2 stops10h 49m

Montreal Pierre Elliott Trudeau Intl

Tue 1/6

9:34 am-8:45 pm

2 stops12h 11m

$596

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/15

3:19 pm-3:57 pm

1 stop23h 38m

Montreal Pierre Elliott Trudeau Intl

Mon 12/22

9:25 am-10:43 pm

1 stop14h 18m

$601

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/15

6:39 am-6:54 pm

2 stops11h 15m

Montreal Pierre Elliott Trudeau Intl

Tue 1/6

9:34 am-8:45 pm

2 stops12h 11m

$612

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/1

4:05 pm-11:22 pm

1 stop6h 17m

Montreal Pierre Elliott Trudeau Intl

Sun 12/7

10:10 am-3:29 pm

1 stop6h 19m

$626

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/1

4:05 pm-12:32 am

1 stop7h 27m

Montreal Pierre Elliott Trudeau Intl

Sun 12/7

8:50 am-3:29 pm

2 stops7h 39m

$657

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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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 typical price of a round-trip flight between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport?

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 Monday. Travelers who choose to depart for Montreal Pierre Elliott Trudeau Intl Airport on a Monday will often find tickets for as low as $1,031. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,222. 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 $1,098.

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

$578

Direct flights

None
The best one-way flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in the past 72 hours is $578. 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 $847.
There are no direct flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport. Popular non-direct route for this connection is Lambert-St Louis Airport - Montreal Pierre Elliott Trudeau Intl Airport.
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 4h 17m.

  • 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
8,997 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,001 reviews
Search Delta flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,394 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,036 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
Magog
Trois-Rivières
Boucherville
Cornwall
Sherbrooke
Drummondville
Montebello
Saint-Sauveur
Bromont
Saint-Jean-sur-Richelieu
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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