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$185+ Cheap flights from St. Louis (STL) to Montreal (YMQ)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
feb. 14 — feb. 211
sáb. 2/14
sáb. 2/21
1 adult, Economy
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Cheap flight deals from St. Louis to Montreal

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Montreal (YMQ). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 15, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$357
(American Airlines)

One-way from

$185
(Kiwi.com)

Popular in

October

Cheapest in

June

Good round-trip deal

$688 or less

Good one-way deal

$366 or less
Provider with most accurate pricing for Lambert-St Louis-Montreal (YMQ) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Montreal (YMQ) flights.
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From Lambert-St Louis to Montreal (YMQ)
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One-way flight from Lambert-St Louis to Montreal (YMQ)
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Highest demand for flights based on searches. 15% potential increase in price ($112 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
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Price to beat on a round-trip flight from Lambert-St Louis to Montreal (YMQ).
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Price to beat on a one-way flight from Lambert-St Louis to Montreal (YMQ).
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Find flight deals from St. Louis to Montreal

Cheapest flights from St. Louis to Montreal
Explore the most affordable flight options available from St. Louis to Montreal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 15, 2026.

This American Airlines deal was found by Cheapflights users on 1/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/186:36 pm
STL
-
YUL
1 stop19h 28m
American Airlines
lun. 2/233:45 pm
YUL
-
STL
1 stop17h 56m
American Airlines
Deal found 1/13$357
This American Airlines deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/176:31 pm
STL
-
YUL
1 stop19h 33m
American Airlines
vie. 2/203:45 pm
YUL
-
STL
1 stop19h 28m
American Airlines
Deal found 1/14$359
This Kiwi.com deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/283:49 pm
STL
-
YUL
1 stop7h 41m
Multiple Airlines
sáb. 3/74:55 pm
YUL
-
STL
2 stops14h 02m
Multiple Airlines
Deal found 1/14$436
This Kiwi.com deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/55:42 pm
STL
-
YUL
1 stop29h 48m
Multiple Airlines
dom. 2/84:35 pm
YUL
-
STL
1 stop17h 46m
Multiple Airlines
Deal found 1/14$456
This Kiwi.com deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/35:42 pm
STL
-
YUL
2 stops29h 56m
Multiple Airlines
vie. 2/64:35 pm
YUL
-
STL
1 stop7h 58m
Multiple Airlines
Deal found 1/14$475
This American Airlines deal was found by Cheapflights users on 1/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 2/186:36 pm
STL
-
YUL
1 stop19h 28m
American Airlines
dom. 2/227:12 am
YUL
-
STL
1 stop13h 18m
American Airlines
Deal found 1/13$485
This American Airlines deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/196:00 am
STL
-
YUL
1 stop8h 04m
American Airlines
lun. 2/233:45 pm
YUL
-
STL
1 stop17h 56m
American Airlines
Deal found 1/14$494
This American Airlines deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/36:52 am
STL
-
YUL
1 stop5h 53m
American Airlines
vie. 2/63:50 pm
YUL
-
STL
1 stop19h 30m
American Airlines
Deal found 1/14$501
This Kiwi.com deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 3/202:23 pm
STL
-
YUL
1 stop9h 07m
Multiple Airlines
lun. 3/238:00 am
YUL
-
STL
2 stops27h 31m
Multiple Airlines
Deal found 1/12$503

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated enero 15, 2026.
Use the filters below to find and compare flights from St. Louis to Montreal that are best for you.

Fly from

St. Louis

Fly to

Montreal

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mié. 2/18

6:36 pm-3:04 pm

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

lun. 2/23

3:45 pm-8:41 am

1 stop17h 56m

$357

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mar. 2/3

5:42 pm-12:38 am

2 stops29h 56m

Montreal Pierre Elliott Trudeau Intl

vie. 2/6

4:35 pm-11:33 pm

1 stop7h 58m

$475

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mié. 2/18

6:36 pm-3:04 pm

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

dom. 2/22

7:12 am-7:30 pm

1 stop13h 18m

$485

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

jue. 2/19

6:00 am-3:04 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

lun. 2/23

3:45 pm-8:41 am

1 stop17h 56m

$494

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mar. 2/3

6:52 am-1:45 pm

1 stop5h 53m

Montreal Pierre Elliott Trudeau Intl

vie. 2/6

3:50 pm-10:20 am

1 stop19h 30m

$501

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

vie. 3/20

2:23 pm-12:30 am

1 stop9h 07m

Montreal Pierre Elliott Trudeau Intl

lun. 3/23

8:00 am-10:31 am

2 stops27h 31m

$503

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mié. 3/18

6:29 am-11:40 pm

1 stop16h 11m

Montreal Pierre Elliott Trudeau Intl

mar. 3/24

7:00 am-11:15 pm

1 stop17h 15m

$529

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

sáb. 2/28

9:55 am-9:17 pm

1 stop10h 22m

Montreal Pierre Elliott Trudeau Intl

sáb. 3/7

6:00 am-2:43 pm

1 stop9h 43m

$532

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

jue. 3/12

8:06 pm-12:38 am

3 stops51h 32m

Montreal Pierre Elliott Trudeau Intl

lun. 3/16

5:25 pm-9:49 am

3 stops41h 24m

$534

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

jue. 3/12

1:34 pm-10:44 pm

1 stop8h 10m

Montreal Pierre Elliott Trudeau Intl

lun. 3/16

3:45 pm-9:29 am

1 stop18h 44m

$543

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/14

Showing 1-10 of 22 results
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Compare providers for flights from St. Louis to Montreal

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Montreal in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Montreal flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Montreal flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Montreal flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Montreal flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Montreal flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Montreal

Have a flexible travel schedule? Discover the best time to fly to Montreal from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Montreal

What is the cheapest month to book a flight from St. Louis to Montreal?

Currently, July is the cheapest month in which you can book a flight from St. Louis to Montreal (average of $218). Flying from St. Louis to Montreal in February is currently the most expensive (average of $1,289). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Montreal

Get insights into the airlines that provide service to Montreal. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Montreal. Reviews last updated enero 15, 2026.
Read through reviews of airlines operating flights from St. Louis to Montreal, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,049 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,049 reviews
Delta
7.9
Good
8,049 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,164 reviews
Delta
7.9
Good
8,049 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,132 reviews
Delta
7.9
Good
8,049 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,622 reviews
Delta
7.9
Good
8,049 reviews

Boarding

8.1

Crew

8.5

Food

7.2

Entertainment

7.8

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Montreal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Montreal?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Montreal. On average, Lambert-St Louis has 0 outbound flights to Montreal per day from 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from St. Louis to Montreal?

    American Airlines can get you from St. Louis to Montreal in just under 19h 28m. Your travel time can differ by up to . St. Louis and Montreal are separated by a distance of 967 mi.

  • What are the cheapest airlines flying from St. Louis to Montreal round-trip?

    Cheapflights users have booked flights from St. Louis to Montreal round-trip from $212. Other airlines that can offer you cheap pricing are United Airlines, from $246, and Air Canada, from $285. Delta is currently priced 64% below the average price you’ll pay for this route.

  • What are the cheapest flights from St. Louis to Montreal?

    Looking at all options, your cheapest flight can be booked for $266. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $431 on average, our data indicates $1,417 when flying from St. Louis to Montreal.

  • Can I find deals for flights from St. Louis to Montreal that include hotel bookings?

    Yes. In addition to deals on St. Louis to Montreal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Montreal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Montreal.

  • Can I find deals for business class flights from St. Louis to Montreal?

    Yes. Cheapflights offers flight deals from St. Louis to Montreal by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Montreal?

    Currently, July is the cheapest month in which you can book a flight from St. Louis to Montreal (average of $218). Flying from St. Louis to Montreal in February is currently the most expensive (average of $1,289). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from St. Louis to Montreal

Discover the top 4 airlines that operate flights from St. Louis to Montreal. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated enero 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$212Average$660FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$246Average$613FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$285Average$692FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$348Average$650FlexibilityNo cancel feeOn-time71%

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