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$171+ 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 23 — Mar 21
Mon 2/23
Mon 3/2
1 adult, Economy
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Cheap 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 January 24, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/22. 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.
Tue 4/74:54 pm
STL
-
YUL
1 stop30h 36m
Multiple Airlines
Thu 4/94:35 pm
YUL
-
STL
1 stop16h 16m
Multiple Airlines
Deal found 1/22$337
This American Airlines deal was found by Cheapflights users on 1/23. 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.
Tue 2/176:00 am
STL
-
YUL
1 stop8h 04m
American Airlines
Fri 2/203:45 pm
YUL
-
STL
1 stop19h 28m
American Airlines
Deal found 1/23$368
This American Airlines deal was found by Cheapflights users on 1/22. 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.
Tue 3/106:37 pm
STL
-
YUL
1 stop19h 28m
American Airlines
Sat 3/147:30 am
YUL
-
STL
2 stops11h 30m
American Airlines
Deal found 1/22$452
This Kiwi.com deal was found by Cheapflights users on 1/22. 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.
Mon 2/233:49 pm
STL
-
YUL
1 stop7h 41m
Multiple Airlines
Sat 2/2810:15 am
YUL
-
STL
2 stops14h 44m
Multiple Airlines
Deal found 1/22$473
This American Airlines deal was found by Cheapflights users on 1/23. 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.
Mon 3/96:57 pm
STL
-
YUL
1 stop17h 48m
American Airlines
Mon 3/163:45 pm
YUL
-
STL
1 stop18h 44m
American Airlines
Deal found 1/23$476
This American Airlines deal was found by Cheapflights users on 1/23. 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.
Sun 5/36:27 am
STL
-
YUL
1 stop8h 00m
American Airlines
Thu 5/712:30 pm
YUL
-
STL
1 stop12h 18m
American Airlines
Deal found 1/23$497
This Gotogate deal was found by Cheapflights users on 1/22. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:10 pm
STL
-
YUL
Nonstop2h 32m
Air Canada
Sun 9/64:40 pm
YUL
-
STL
Nonstop2h 47m
Air Canada
Deal found 1/22$504
This Kiwi.com deal was found by Cheapflights users on 1/23. 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.
Mon 2/233:49 pm
STL
-
YUL
1 stop7h 41m
Multiple Airlines
Fri 2/276:20 pm
YUL
-
STL
2 stops30h 39m
Multiple Airlines
Deal found 1/23$509

Find 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 January 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$337
(Kiwi.com)

One-way from

$171
(Kiwi.com)

Popular in

October

Cheapest in

June

Good round-trip deal

$792 or less

Good one-way deal

$442 or less
Provider with most accurate pricing for Lambert-St Louis-Montreal (YMQ) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Montreal (YMQ) flights.
Search Deals
From Lambert-St Louis to Montreal (YMQ)
Search Deals
One-way flight from Lambert-St Louis to Montreal (YMQ)
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($110 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Montreal (YMQ).
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Montreal (YMQ).
Search Deals

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 January 24, 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

Tue 2/17

6:00 am-3:04 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:45 pm-10:13 am

1 stop19h 28m

$368

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/24

6:31 pm-3:04 pm

1 stop19h 33m

Montreal Pierre Elliott Trudeau Intl

Fri 3/6

3:45 pm-10:13 am

1 stop19h 28m

$368

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 2/28

8:00 am-10:56 pm

2 stops13h 56m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

3:45 pm-11:48 pm

1 stop9h 03m

$378

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 3/10

6:37 pm-3:05 pm

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

Sat 3/14

7:30 am-6:00 pm

2 stops11h 30m

$452

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 3/9

6:57 pm-1:45 pm

1 stop17h 48m

Montreal Pierre Elliott Trudeau Intl

Mon 3/16

3:45 pm-9:29 am

1 stop18h 44m

$476

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 3/8

4:05 pm-8:22 am

1 stop15h 17m

Montreal Pierre Elliott Trudeau Intl

Sun 3/15

8:50 am-3:29 pm

2 stops7h 39m

$524

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 3/15

8:00 am-3:05 pm

1 stop6h 05m

Montreal Pierre Elliott Trudeau Intl

Wed 3/18

3:45 pm-11:48 pm

1 stop9h 03m

$529

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 3/9

2:09 pm-4:30 pm

3 stops25h 21m

$184

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 3/10

8:06 pm-12:38 am

3 stops27h 32m

$195

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 1/28

3:46 pm-8:14 pm

3 stops51h 28m

$219

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/23

Showing 1-10 of 16 results
1
2

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

*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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Montreal flight deals on Cheapflights vs. FlightHub >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 Expedia the most. Expedia 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 $220). 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 January 24, 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
8,110 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
8,110 reviews
Delta
7.9
Good
8,110 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
9,194 reviews
Delta
7.9
Good
8,110 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
11,193 reviews
Delta
7.9
Good
8,110 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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
10,652 reviews
Delta
7.9
Good
8,110 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Food

7.2

Crew

8.5

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 8h 04m. 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 $259. 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 $343. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $337 on average, our data indicates $707 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 $220). 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 January 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$212Average$660FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$246Average$613FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$259Average$661FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$348Average$650FlexibilityNo cancel feeOn-time71%

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