$189+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Jul 16 — Jul 231
Round-trip
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
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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 June 16, 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 June 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/14. 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.
Tue 10/68:05 pm
STL
- YUL
1 stop14h 15m
American Airlines
Tue 10/1312:30 pm
YUL
- STL
1 stop8h 38m
American Airlines
Deal found 6/14![American Airlines logo]()
$427
This American Airlines deal was found by Cheapflights users on 6/14. 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.
Sat 9/58:06 pm
STL
- YUL
1 stop14h 37m
American Airlines
Tue 9/85:34 pm
YUL
- STL
1 stop17h 46m
American Airlines
Deal found 6/14![American Airlines logo]()
$470
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Tue 8/186:00 am
STL
- YUL
1 stop9h 53m
American Airlines
Fri 8/215:34 pm
YUL
- STL
1 stop15h 49m
American Airlines
Deal found 6/12![American Airlines logo]()
$483
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Wed 9/165:00 am
STL
- YUL
1 stop10h 53m
American Airlines
Wed 9/235:34 pm
YUL
- STL
1 stop17h 46m
American Airlines
Deal found 6/12![American Airlines logo]()
$513
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Sat 8/85:00 am
STL
- YUL
1 stop10h 54m
American Airlines
Tue 8/1812:30 pm
YUL
- STL
1 stop12h 44m
American Airlines
Deal found 6/12![American Airlines logo]()
$524
This Kiwi.com deal was found by Cheapflights users on 6/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/45:06 pm
STL
- YUL
2 stops24h 09m
Multiple Airlines
Mon 7/136:47 pm
YUL
- STL
1 stop15h 56m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$526
This Kiwi.com deal was found by Cheapflights users on 6/14. 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.
Mon 7/134:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Wed 7/156:47 pm
YUL
- STL
1 stop6h 06m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$540
This Kiwi.com deal was found by Cheapflights users on 6/16. 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 8/186:33 pm
STL
- YUL
2 stops22h 42m
Multiple Airlines
Fri 8/217:00 am
YUL
- STL
1 stop5h 46m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$545
This American Airlines deal was found by Cheapflights users on 6/14. 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.
Tue 6/302:26 pm
STL
- YUL
1 stop18h 24m
American Airlines
Tue 7/712:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 6/14![American Airlines logo]()
$547
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 June 16, 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 June 16, 2026.
This United Airlines deal was found by Cheapflights users on 6/15. 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 8/318:00 am
STL
- YUL
1 stop10h 08m
United Airlines
Tue 9/11:15 pm
YUL
- STL
1 stop9h 45m
United Airlines
Deal found 6/15![United Airlines logo]()
$606
This United deal was found by Cheapflights users on 6/12. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:50 am
STL
- YUL
1 stop7h 40m
Multiple Airlines
Wed 9/234:55 pm
YUL
- STL
Nonstop2h 46m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$617
This Delta deal was found by Cheapflights users on 6/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/254:59 pm
STL
- YUL
1 stop5h 58m
Delta
Sun 9/277:00 am
YUL
- STL
1 stop7h 23m
Delta
Deal found 6/13![Delta logo]()
$632
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Sun 6/289:25 am
STL
- YUL
1 stop12h 34m
American Airlines
Fri 7/37:17 am
YUL
- STL
1 stop11h 04m
American Airlines
Deal found 6/12![American Airlines logo]()
$662
This United deal was found by Cheapflights users on 6/12. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/110:20 am
STL
- YUL
1 stop6h 10m
Multiple Airlines
Wed 7/84:55 pm
YUL
- STL
Nonstop2h 47m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$647
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/512:59 pm
STL
- YUL
2 stops8h 07m
United Airlines
Tue 9/811:23 am
YUL
- STL
2 stops11h 37m
United Airlines
Deal found 6/14![United Airlines logo]()
$647
This Delta deal was found by Cheapflights users on 6/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:40 am
STL
- YUL
2 stops11h 13m
Delta
Wed 9/239:30 am
YUL
- STL
2 stops12h 05m
Delta
Deal found 6/12![Delta logo]()
$664
This United deal was found by Cheapflights users on 6/13. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/3012:55 pm
STL
- YUL
1 stop5h 50m
Multiple Airlines
Tue 7/74:55 pm
YUL
- STL
Nonstop2h 47m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$647
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/306:00 am
STL
- YUL
2 stops7h 40m
United Airlines
Wed 7/82:20 pm
YUL
- STL
2 stops8h 06m
United Airlines
Deal found 6/14![United Airlines logo]()
$677
This United Airlines deal was found by Cheapflights users on 6/15. 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 6/296:00 am
STL
- YUL
2 stops7h 40m
United Airlines
Thu 7/22:20 pm
YUL
- STL
2 stops10h 09m
United Airlines
Deal found 6/15![United Airlines logo]()
$677
This United Airlines deal was found by Cheapflights users on 6/16. 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.
Thu 7/239:20 am
STL
- YUL
1 stop7h 10m
United Airlines
Sun 7/266:10 am
YUL
- STL
1 stop7h 01m
United Airlines
Deal found 6/16![United Airlines logo]()
$722
This United Airlines deal was found by Cheapflights users on 6/16. 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.
Tue 8/188:00 am
STL
- YUL
2 stops10h 45m
United Airlines
Fri 8/216:00 am
YUL
- STL
2 stops10h 38m
United Airlines
Deal found 6/16![United Airlines logo]()
$737
Last-minute flights from St. Louis to MontrealDiscover last-minute flight deals from St. Louis to Montreal. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Montreal. Data last updated June 16, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 6/13. 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.
Sun 6/289:09 am
STL
- YUL
1 stop6h 42m
American Airlines
Tue 7/712:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 6/13![American Airlines logo]()
$591
This American Airlines deal was found by Cheapflights users on 6/14. 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.
Tue 6/302:26 pm
STL
- YUL
1 stop18h 24m
American Airlines
Tue 7/712:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 6/14![American Airlines logo]()
$547
This Kiwi.com deal was found by Cheapflights users on 6/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/45:06 pm
STL
- YUL
2 stops24h 09m
Multiple Airlines
Mon 7/136:47 pm
YUL
- STL
1 stop15h 56m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$526
This Kiwi.com deal was found by Cheapflights users on 6/16. 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.
Sat 7/45:06 pm
STL
- YUL
2 stops24h 09m
Multiple Airlines
Sat 7/116:00 am
YUL
- STL
1 stop4h 31m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$558
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:20 am
STL
- YUL
1 stop9h 10m
United Airlines
Wed 7/156:10 am
YUL
- STL
1 stop16h 16m
United Airlines
Deal found 6/14![United Airlines logo]()
$563
This Kiwi.com deal was found by Cheapflights users on 6/14. 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.
Mon 7/134:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Wed 7/156:47 pm
YUL
- STL
1 stop6h 06m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$540
This Kiwi.com deal was found by Cheapflights users on 6/14. 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.
Mon 7/134:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Thu 7/167:00 am
YUL
- STL
1 stop11h 37m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$590
This Kiwi.com deal was found by Cheapflights users on 6/12. 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.
Sun 7/266:34 pm
STL
- YUL
2 stops22h 41m
Multiple Airlines
Thu 7/307:00 am
YUL
- STL
1 stop17h 53m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$579
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 June 16, 2026.
Search for one-way flight options from St. Louis to Montreal. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/15. 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 9/155:18 pm
STL
- YUL
1 stop17h 26m
American Airlines
Deal found 6/15![American Airlines logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 7/104:57 pm
STL
- YUL
3 stops24h 13m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 7/204:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$207
This Kiwi.com deal was found by Cheapflights users on 6/12. 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.
Sun 7/196:34 pm
STL
- YUL
3 stops40h 36m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 6/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:33 pm
STL
- YUL
3 stops23h 59m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$239
This United Airlines deal was found by Cheapflights users on 6/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:00 am
STL
- YUL
1 stop10h 01m
United Airlines
Deal found 6/12![United Airlines logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 6/15. 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 9/1510:35 am
STL
- YUL
3 stops31h 57m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$258
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Wed 9/167:21 am
STL
- YUL
1 stop8h 32m
American Airlines
Deal found 6/12![American Airlines logo]()
$274
This American Airlines deal was found by Cheapflights users on 6/13. 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.
Tue 9/86:00 am
STL
- YUL
1 stop9h 53m
American Airlines
Deal found 6/13![American Airlines logo]()
$276
This Air Canada deal was found by Cheapflights users on 6/15. 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 9/1512:10 pm
STL
- YUL
Nonstop2h 31m
Air Canada
Deal found 6/15![Air Canada logo]()
$277
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 June 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $427 (American Airlines) |
One-way from | $189 (American Airlines) |
Popular in | March |
Cheapest in | February |
Average price | $669 |
Good round-trip deal | $975 or less |
Good one-way deal | $462 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 June 16, 2026.
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
Cheapest round-trip
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Mon 8/31
8:00 am-7:08 pm
1 stop10h 08m
Montreal Pierre Elliott Trudeau Intl
Tue 9/1
1:15 pm-10:00 pm
1 stop9h 45m
$606
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 9/16
8:50 am-5:30 pm
1 stop7h 40m
Montreal Pierre Elliott Trudeau Intl
Wed 9/23
4:55 pm-6:41 pm
Nonstop2h 46m
$617
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 9/25
4:59 pm-11:57 pm
1 stop5h 58m
Montreal Pierre Elliott Trudeau Intl
Sun 9/27
7:00 am-1:23 pm
1 stop7h 23m
$632
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 7/1
10:20 am-5:30 pm
1 stop6h 10m
Montreal Pierre Elliott Trudeau Intl
Wed 7/8
4:55 pm-6:42 pm
Nonstop2h 47m
$647
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Sat 9/5
12:59 pm-10:06 pm
2 stops8h 07m
Montreal Pierre Elliott Trudeau Intl
Tue 9/8
11:23 am-10:00 pm
2 stops11h 37m
$647
Quickest round-trip
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 6/30
12:55 pm-7:45 pm
1 stop5h 50m
Montreal Pierre Elliott Trudeau Intl
Tue 7/7
4:55 pm-6:42 pm
Nonstop2h 47m
$647
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Sun 6/28
9:25 am-10:59 pm
1 stop12h 34m
Montreal Pierre Elliott Trudeau Intl
Fri 7/3
7:17 am-5:21 pm
1 stop11h 04m
$662
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 9/16
6:40 am-6:53 pm
2 stops11h 13m
Montreal Pierre Elliott Trudeau Intl
Wed 9/23
9:30 am-8:35 pm
2 stops12h 05m
$664
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 6/30
6:00 am-2:40 pm
2 stops7h 40m
Montreal Pierre Elliott Trudeau Intl
Wed 7/8
2:20 pm-9:26 pm
2 stops8h 06m
$677
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Mon 6/29
6:00 am-2:40 pm
2 stops7h 40m
Montreal Pierre Elliott Trudeau Intl
Thu 7/2
2:20 pm-11:29 pm
2 stops10h 09m
$677
Showing 1-10 of 19 resultsSorted by cheapest first
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 June.
| 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, August is the cheapest month in which you can book a flight from St. Louis to Montreal (average of $257). Flying from St. Louis to Montreal in November is currently the most expensive (average of $650). 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.
What is the cheapest time of day to fly from STL to YMQ?
Find hourly flight availability from St. Louis to Montreal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 16, 2026.
When flying from St. Louis to Montreal, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How much does it cost to fly round-trip from St. Louis to Montreal?
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 June 16, 2026.
Read through reviews of airlines operating flights from St. Louis to Montreal, such as Delta,American Airlines, andAir Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.8
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.8
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.8
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.8
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
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 June 16, 2026.
St. Louis and Montreal flights
Browse other St. Louis and Montreal flight options. Last updated on June 16, 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 June 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 3 airlines flying from St. Louis to Montreal
Discover the top 3 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 June 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$257 | Average$624 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$296 | Average$759 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$348 | Average$617 | FlexibilityNo cancel fee | On-time71% |