$155+ 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 4/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Mar 15 — Mar 221
1 adult, Economy
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Find cheap flights from St. Louis to Montreal with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Montreal
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Best
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Cheapest flights from St. Louis to MontrealExplore 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 February 13, 2026.
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 February 13, 2026.
This American Airlines deal was found by Cheapflights users on 2/10. 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 5/55:21 pm
STL
- YUL
1 stop17h 23m
American Airlines
Sat 5/912:30 pm
YUL
- STL
1 stop10h 49m
American Airlines
Deal found 2/10![American Airlines logo]()
$332
This American Airlines deal was found by Cheapflights users on 2/10. 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.
Wed 4/228:03 pm
STL
- YUL
1 stop14h 41m
American Airlines
Sun 4/2612:30 pm
YUL
- STL
1 stop12h 16m
American Airlines
Deal found 2/10![American Airlines logo]()
$421
This United Airlines deal was found by Cheapflights users on 2/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/29:55 am
STL
- YUL
1 stop7h 45m
United Airlines
Wed 3/49:25 am
YUL
- STL
1 stop12h 40m
United Airlines
Deal found 2/9![United Airlines logo]()
$446
This American Airlines deal was found by Cheapflights users on 2/10. 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 5/37:00 am
STL
- YUL
1 stop14h 58m
American Airlines
Sat 5/912:30 pm
YUL
- STL
1 stop10h 49m
American Airlines
Deal found 2/10![American Airlines logo]()
$479
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 5/14:55 pm
STL
- YUL
1 stop30h 30m
Multiple Airlines
Fri 5/86:55 pm
YUL
- STL
2 stops12h 55m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$500
This American Airlines deal was found by Cheapflights users on 2/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/138:03 pm
STL
- YUL
1 stop14h 41m
American Airlines
Thu 4/1612:30 pm
YUL
- STL
1 stop12h 16m
American Airlines
Deal found 2/12![American Airlines logo]()
$511
Best flights from St. Louis to MontrealDiscover carefully curated flight deals from St. Louis to Montreal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 13, 2026.
Discover carefully curated flight deals from St. Louis to Montreal that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 13, 2026.
This American Airlines deal was found by Cheapflights users on 2/10. 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 5/55:21 pm
STL
- YUL
1 stop17h 23m
American Airlines
Sat 5/912:30 pm
YUL
- STL
1 stop10h 49m
American Airlines
Deal found 2/10![American Airlines logo]()
$332
This United Airlines deal was found by Cheapflights users on 2/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/29:55 am
STL
- YUL
1 stop7h 45m
United Airlines
Wed 3/49:25 am
YUL
- STL
1 stop12h 40m
United Airlines
Deal found 2/9![United Airlines logo]()
$446
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 5/14:55 pm
STL
- YUL
1 stop30h 30m
Multiple Airlines
Fri 5/86:55 pm
YUL
- STL
2 stops12h 55m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$500
This Air Canada deal was found by Cheapflights users on 2/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/161:00 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Tue 6/236:10 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 2/10![Air Canada logo]()
$522
This Air Canada deal was found by Cheapflights users on 2/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/51:00 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Sat 5/96:10 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 2/10![Air Canada logo]()
$522
This Air Canada deal was found by Cheapflights users on 2/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/31:00 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Sat 5/96:10 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 2/10![Air Canada logo]()
$522
This Air Canada deal was found by Cheapflights users on 2/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/161:00 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Fri 6/196:10 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 2/11![Air Canada logo]()
$522
Last-minute flights from St. Louis to MontrealDiscover last-minute flight deals from St. Louis to Montreal. Data last updated February 13, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Montreal. Data last updated February 13, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 2/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/29:55 am
STL
- YUL
1 stop7h 45m
United Airlines
Wed 3/49:25 am
YUL
- STL
1 stop12h 40m
United Airlines
Deal found 2/9![United Airlines logo]()
$446
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Mon 3/23:49 pm
STL
- YUL
1 stop7h 41m
Multiple Airlines
Wed 3/45:25 pm
YUL
- STL
2 stops31h 34m
Multiple Airlines
Deal found 2/12![Multiple Airlines logo]()
$517
This American Airlines deal was found by Cheapflights users on 2/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:36 pm
STL
- YUL
1 stop19h 28m
American Airlines
Wed 3/43:45 pm
YUL
- STL
1 stop19h 18m
American Airlines
Deal found 2/12![American Airlines logo]()
$535
This Air Canada deal was found by Cheapflights users on 2/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/24:05 pm
STL
- YUL
1 stop4h 47m
Air Canada
Wed 3/48:50 am
YUL
- STL
2 stops7h 39m
Air Canada
Deal found 2/12![Air Canada logo]()
$555
This Delta deal was found by Cheapflights users on 2/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:35 am
STL
- YUL
1 stop4h 24m
Delta
Thu 3/126:45 pm
YUL
- STL
1 stop6h 13m
Delta
Deal found 2/11![Delta logo]()
$614
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 3/2712:14 pm
STL
- YUL
2 stops35h 24m
Multiple Airlines
Fri 4/36:45 pm
YUL
- STL
1 stop6h 13m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$600
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Sun 3/297:52 am
STL
- YUL
1 stop15h 38m
Multiple Airlines
Sun 4/55:25 pm
YUL
- STL
2 stops15h 26m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$561
One-way flights from St. Louis to MontrealSearch for one-way flight options from St. Louis to Montreal. Find affordable one-way fares based on user searches. Data last updated February 13, 2026.
Search for one-way flight options from St. Louis to Montreal. Find affordable one-way fares based on user searches. Data last updated February 13, 2026.
This American Airlines deal was found by Cheapflights users on 2/10. 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 4/208:03 pm
STL
- YUL
1 stop14h 41m
American Airlines
Deal found 2/10![American Airlines logo]()
$155
This American Airlines deal was found by Cheapflights users on 2/10. 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.
Fri 4/178:03 pm
STL
- YUL
1 stop14h 41m
American Airlines
Deal found 2/10![American Airlines logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 4/178:13 pm
STL
- YUL
3 stops44h 32m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 4/208:13 pm
STL
- YUL
2 stops41h 57m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$179
This United Airlines deal was found by Cheapflights users on 2/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/147:00 pm
STL
- YUL
1 stop14h 20m
United Airlines
Deal found 2/10![United Airlines logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Fri 5/293:48 pm
STL
- YUL
3 stops31h 37m
Multiple Airlines
Deal found 2/12![Multiple Airlines logo]()
$218
This Air Canada deal was found by Cheapflights users on 2/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/291:00 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Deal found 2/12![Air Canada logo]()
$236
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 February 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $332 (American Airlines) |
One-way from | $155 (American Airlines) |
Popular in | October |
Cheapest in | June |
Average price | $506 |
Good round-trip deal | $749 or less |
Good one-way deal | $299 or less |
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 February 13, 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 5/5
5:21 pm-11:44 am
1 stop17h 23m
Montreal Pierre Elliott Trudeau Intl
Sat 5/9
12:30 pm-10:19 pm
1 stop10h 49m
$332
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Mon 3/2
9:55 am-6:40 pm
1 stop7h 45m
Montreal Pierre Elliott Trudeau Intl
Wed 3/4
9:25 am-9:05 pm
1 stop12h 40m
$446
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 5/1
4:55 pm-12:25 am
1 stop30h 30m
Montreal Pierre Elliott Trudeau Intl
Fri 5/8
6:55 pm-6:50 am
2 stops12h 55m
$500
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 6/16
1:00 pm-4:35 pm
Nonstop2h 35m
Montreal Pierre Elliott Trudeau Intl
Tue 6/23
6:10 pm-8:05 pm
Nonstop2h 55m
$522
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 5/5
1:00 pm-4:35 pm
Nonstop2h 35m
Montreal Pierre Elliott Trudeau Intl
Sat 5/9
6:10 pm-8:05 pm
Nonstop2h 55m
$522
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Sun 5/3
1:00 pm-4:35 pm
Nonstop2h 35m
Montreal Pierre Elliott Trudeau Intl
Sat 5/9
6:10 pm-8:05 pm
Nonstop2h 55m
$522
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 6/16
1:00 pm-4:35 pm
Nonstop2h 35m
Montreal Pierre Elliott Trudeau Intl
Fri 6/19
6:10 pm-8:05 pm
Nonstop2h 55m
$522
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Mon 4/20
8:03 pm-11:44 am
1 stop14h 41m
$155
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 4/17
8:03 pm-11:44 am
1 stop14h 41m
$164
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 4/17
8:13 pm-5:45 pm
3 stops44h 32m
$173
Showing 1-10 of 16 results
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 February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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 FlightHub the most. FlightHub 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.
STL-YMQ
STL-YUL
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
STL-YMQ
STL-YUL
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 February 13, 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.
Comfort
7.9
Overall
7.9
Food
7.2
Boarding
8.1
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Comfort
7.9
Overall
7.9
Food
7.2
Boarding
8.1
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Comfort
7.9
Overall
7.9
Food
7.2
Boarding
8.1
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Comfort
7.9
Overall
7.9
Food
7.2
Boarding
8.1
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Comfort
7.9
Overall
7.9
Food
7.2
Boarding
8.1
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for St. Louis to Montreal
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Complete your trip
Complete your trip to Montreal by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Montreal by cabin class
Find flights from St. Louis to Montreal, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Montreal
Explore flights to Montreal departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 13, 2026.
St. Louis and Montreal flights
Browse other St. Louis and Montreal flight options. Last updated on February 13, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on February 13, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 February 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$212 | Average$634 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$246 | Average$582 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$285 | Average$667 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$348 | Average$683 | FlexibilityNo cancel fee | On-time71% |