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Cheap flights from St. Louis to Montreal from $259

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.
1 adult
0 bags

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Cheap round-trip flights

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American Airlines Logo
6:00 am - 3:08 pmSTL-YUL
8h 08m1 stop
American Airlines Logo
3:50 pm - 10:20 amYUL-STL
19h 30m1 stop
$360American Airlines
Find Deal
Tue, Jan 13 - Tue, Jan 27
American Airlines Logo
3:20 pm - 3:08 pmSTL-YUL
22h 48m1 stop
American Airlines Logo
7:30 am - 6:16 pmYUL-STL
11h 46m2 stops
$370American Airlines
Find Deal
Tue, Jan 13 - Tue, Jan 27
American Airlines Logo
11:05 am - 3:08 pmSTL-YUL
27h 03m1 stop
American Airlines Logo
3:50 pm - 10:20 amYUL-STL
19h 30m1 stop
$408American Airlines
Find Deal
Sat, Jan 17 - Mon, Jan 19
American Airlines Logo
11:05 am - 3:08 pmSTL-YUL
27h 03m1 stop
American Airlines Logo
3:50 pm - 10:20 amYUL-STL
19h 30m1 stop
$409American Airlines
Find Deal
Sat, Jan 17 - Mon, Jan 19
American Airlines Logo
6:00 am - 3:08 pmSTL-YUL
8h 08m1 stop
American Airlines Logo
3:50 pm - 10:20 amYUL-STL
19h 30m1 stop
$447American Airlines
Find Deal
Thu, Jan 15 - Mon, Jan 19
American Airlines Logo
6:00 am - 3:08 pmSTL-YUL
8h 08m1 stop
American Airlines Logo
3:52 pm - 10:20 amYUL-STL
19h 28m1 stop
$448American Airlines
Find Deal
Thu, Jan 15 - Mon, Jan 19
Multiple Airlines Logo
10:40 am - 12:30 amSTL-YUL
12h 50m1 stop
Multiple Airlines Logo
6:45 am - 10:33 pmYUL-STL
40h 48m2 stops
$471Multiple Airlines
Find Deal
Mon, Dec 29 - Tue, Jan 6
United Airlines Logo
8:05 am - 9:16 pmSTL-YUL
12h 11m2 stops
United Airlines Logo
10:25 am - 10:58 pmYUL-STL
13h 33m2 stops
$483United Airlines
Find Deal
Tue, Jan 13 - Tue, Jan 27
United Airlines Logo
8:05 am - 9:16 pmSTL-YUL
12h 11m2 stops
United Airlines Logo
10:25 am - 10:58 pmYUL-STL
13h 33m2 stops
$501United Airlines
Find Deal
Wed, Jan 21 - Mon, Jan 26
Multiple Airlines Logo
11:51 am - 3:10 pmSTL-YUL
26h 19m1 stop
Multiple Airlines Logo
4:35 pm - 9:40 amYUL-STL
18h 05m2 stops
$506Multiple Airlines
Find Deal
Tue, Dec 23 - Wed, Dec 31

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
Dec 30
STL5:59 pmLambert-St Louis
4h 20m
1 stop
YUL11:19 pmMontreal Pierre Elliott Trudeau Intl
Jan 8
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 09m
2 stops
STL8:43 pmLambert-St Louis
$648
Find similar
Delta
Jan 2
STL5:59 pmLambert-St Louis
4h 20m
1 stop
YUL11:19 pmMontreal Pierre Elliott Trudeau Intl
Jan 7
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 09m
2 stops
STL8:43 pmLambert-St Louis
$669
Find similar
Delta
Dec 15
STL9:50 amLambert-St Louis
8h 04m
1 stop
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Jan 6
YUL2:45 pmMontreal Pierre Elliott Trudeau Intl
9h 54m
1 stop
STL11:39 pmLambert-St Louis
$691
Find similar

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
Jan 17
STL4:05 pmLambert-St Louis
6h 17m
1 stop
YUL11:22 pmMontreal Pierre Elliott Trudeau Intl
Jan 19
YUL8:50 amMontreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 pmLambert-St Louis
$661
Find similar
Air Canada
Jan 17
STL4:05 pmLambert-St Louis
6h 17m
1 stop
YUL11:22 pmMontreal Pierre Elliott Trudeau Intl
Jan 19
YUL8:50 amMontreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 pmLambert-St Louis
$666
Find similar
Air Canada
Jan 15
STL4:05 pmLambert-St Louis
7h 27m
1 stop
YUL12:32 amMontreal Pierre Elliott Trudeau Intl
Jan 19
YUL8:50 amMontreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 pmLambert-St Louis
$684
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Montreal 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 25, 2025.
Use the filters below to find and compare flights from St. Louis to Montreal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/13

6:00 am-3:08 pm

1 stop8h 08m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

3:50 pm-10:20 am

1 stop19h 30m

$360

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/13

3:20 pm-3:08 pm

1 stop22h 48m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

7:30 am-6:16 pm

2 stops11h 46m

$370

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/17

11:05 am-3:08 pm

1 stop27h 03m

Montreal Pierre Elliott Trudeau Intl

Mon 1/19

3:50 pm-10:20 am

1 stop19h 30m

$408

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/17

11:05 am-3:08 pm

1 stop27h 03m

Montreal Pierre Elliott Trudeau Intl

Mon 1/19

3:50 pm-10:20 am

1 stop19h 30m

$409

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 1/15

6:00 am-3:08 pm

1 stop8h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 1/19

3:50 pm-10:20 am

1 stop19h 30m

$447

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 1/15

6:00 am-3:08 pm

1 stop8h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 1/19

3:52 pm-10:20 am

1 stop19h 28m

$448

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/29

10:40 am-12:30 am

1 stop12h 50m

Montreal Pierre Elliott Trudeau Intl

Tue 1/6

6:45 am-10:33 pm

2 stops40h 48m

$471

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/13

8:05 am-9:16 pm

2 stops12h 11m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

10:25 am-10:58 pm

2 stops13h 33m

$483

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 1/21

8:05 am-9:16 pm

2 stops12h 11m

Montreal Pierre Elliott Trudeau Intl

Mon 1/26

10:25 am-10:58 pm

2 stops13h 33m

$501

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 12/23

11:51 am-3:10 pm

1 stop26h 19m

Montreal Pierre Elliott Trudeau Intl

Wed 12/31

4:35 pm-9:40 am

2 stops18h 05m

$506

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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

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?

What is the cheapest day to depart on your flight to Montreal?

The cheapest day to depart from St. Louis to Montreal is on a Tuesday when prices can be found for as low as $1,026. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,205. 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?

Our most recent data shows that the best time of day to fly to Montreal is in the evening. Flights from St. Louis to Montreal during this time can be as low as $266. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,098 per ticket.

What is the cheapest Lambert-St Louis to Montreal flight route?

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

What cabin class options are available on Lambert-St Louis to Montreal flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to Montreal 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 flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Montreal.

When to book flights from St. Louis to Montreal

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

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal

Best Price Found

$774

Fastest flight time

2h 35m

Direct flights

Sat

Airports in Montreal

1 airport
The best one-way flight to Montreal from St. Louis in the past 72 hours is $774. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $951.
The fastest flight from St. Louis to Montreal takes 2h 35m
Direct flights go from St. Louis to Montreal on Saturday. The only airline offering direct flights is Air Canada.
There is 1 airport near Montreal: Montreal Pierre Elliott Trudeau Intl (YUL)
Search flight deals

  • How far is Lambert-St Louis to Montreal by plane?

    The distance between Lambert-St Louis and Montreal is about 973.0 mi. A reasonable flight in good conditions will take 4h 20m.

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

    Prices for flights from Lambert-St Louis Airport to Montreal are updated daily.

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

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

    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.

  • What documentation or ID do you need to fly to Montreal?

    The required travel and health documents for your Montreal 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. 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?

  • What is the most popular airline from St. Louis to Montreal?

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,043 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
7,998 reviews
Search Delta flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,471 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.

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 can track prices for St. Louis to Montreal flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to Canada

Fly into one of these airports located in Montreal

Airports listed have a maximum distance of 9.4 mi from Montreal
Montreal St Hubert Airport
Montreal Pierre Elliott Trudeau Intl Airport