$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 18 — Jul 251
Round-trip
1 adult, Economy
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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 18, 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 18, 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 6/15. 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 8/186:00 am
STL
- YUL
1 stop9h 53m
American Airlines
Fri 8/215:34 pm
YUL
- STL
1 stop15h 50m
American Airlines
Deal found 6/15![American Airlines logo]()
$483
This Justfly.com deal was found by Cheapflights users on 6/17. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/317:00 am
STL
- YUL
2 stops23h 05m
WestJet
Wed 9/26:00 am
YUL
- STL
1 stop11h 38m
WestJet
Deal found 6/17![WestJet logo]()
$504
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.
Sat 7/45:06 pm
STL
- YUL
2 stops24h 09m
Multiple Airlines
Mon 7/137:00 am
YUL
- STL
1 stop28h 28m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$526
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 7/244:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Wed 7/296:47 pm
YUL
- STL
1 stop6h 06m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$531
This American Airlines deal was found by Cheapflights users on 6/17. 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 7/83:20 pm
STL
- YUL
1 stop17h 28m
American Airlines
Wed 7/1512:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 6/17![American Airlines logo]()
$533
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 8/144:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Mon 8/176:47 pm
YUL
- STL
1 stop6h 11m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$538
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]()
$539
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 6/18. 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
Sat 7/256:00 am
YUL
- STL
1 stop4h 31m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$541
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 18, 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 18, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/18. 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.
Wed 8/266:45 pm
STL
- YUL
2 stops35h 20m
Multiple Airlines
Mon 8/317:00 am
YUL
- STL
1 stop5h 46m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$602
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 Justfly.com deal was found by Cheapflights users on 6/18. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:30 am
STL
- YUL
1 stop16h 00m
WestJet
Mon 8/317:00 am
YUL
- STL
1 stop5h 46m
WestJet
Deal found 6/18![WestJet logo]()
$630
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/315:30 pm
STL
- YUL
1 stop5h 00m
Delta
Wed 9/29:30 am
YUL
- STL
2 stops12h 12m
Delta
Deal found 6/14![Delta logo]()
$641
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 United deal was found by Cheapflights users on 6/18. 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.
Fri 8/288:50 am
STL
- YUL
1 stop7h 40m
Multiple Airlines
Mon 8/314:55 pm
YUL
- STL
Nonstop2h 47m
Multiple Airlines
Deal found 6/18![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 9/198:00 am
STL
- YUL
2 stops10h 45m
United Airlines
Sat 9/262:20 pm
YUL
- STL
2 stops8h 01m
United Airlines
Deal found 6/14![United Airlines logo]()
$647
This United deal was found by Cheapflights users on 6/17. 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.
Thu 8/277:00 am
STL
- YUL
1 stop8h 10m
Multiple Airlines
Sun 8/302:10 pm
YUL
- STL
1 stop7h 12m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$660
This United Airlines deal was found by Cheapflights users on 6/17. 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 9/18:00 am
STL
- YUL
2 stops10h 45m
United Airlines
Fri 9/46:00 am
YUL
- STL
2 stops10h 38m
United Airlines
Deal found 6/17![United Airlines logo]()
$662
This United deal was found by Cheapflights users on 6/18. 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.
Fri 7/179:20 am
STL
- YUL
1 stop7h 10m
Multiple Airlines
Mon 7/201:10 pm
YUL
- STL
2 stops8h 12m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$665
Last-minute flights from St. Louis to MontrealDiscover last-minute flight deals from St. Louis to Montreal. Data last updated June 18, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Montreal. Data last updated June 18, 2026 and is based on user searches.
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
Wed 7/812:30 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 6/14. 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.
Sat 7/45:06 pm
STL
- YUL
2 stops24h 09m
Multiple Airlines
Mon 7/137:00 am
YUL
- STL
1 stop28h 28m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$526
This American Airlines deal was found by Cheapflights users on 6/17. 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 7/83:20 pm
STL
- YUL
1 stop17h 28m
American Airlines
Wed 7/1512:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 6/17![American Airlines logo]()
$533
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 6/17. 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
2 stops20h 11m
Multiple Airlines
Wed 7/156:47 pm
YUL
- STL
1 stop6h 06m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$559
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.
Wed 7/154:57 pm
STL
- YUL
2 stops44h 11m
Multiple Airlines
Wed 7/227:44 pm
YUL
- STL
1 stop17h 03m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$545
This Kiwi.com deal was found by Cheapflights users on 6/18. 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
Sat 7/256:00 am
YUL
- STL
1 stop4h 31m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$541
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/208:55 am
STL
- YUL
1 stop6h 27m
Air Canada
Fri 7/249:10 am
YUL
- STL
1 stop5h 52m
Air Canada
Deal found 6/16![Air Canada logo]()
$558
This Kiwi.com deal was found by Cheapflights users on 6/17. 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
Fri 7/247:44 pm
YUL
- STL
1 stop16h 54m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$565
This Kiwi.com deal was found by Cheapflights users on 6/18. 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 7/244:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Wed 7/296:47 pm
YUL
- STL
1 stop6h 06m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$531
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 18, 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 18, 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 6/16. 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.
Fri 8/285:33 pm
STL
- YUL
3 stops23h 37m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 8/14:57 pm
STL
- YUL
3 stops18h 13m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 6/18. 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.
Thu 9/2410:35 am
STL
- YUL
3 stops36h 50m
Multiple Airlines
Deal found 6/18![Multiple Airlines logo]()
$233
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 6/15. 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.
Wed 10/78:00 am
STL
- YUL
1 stop10h 01m
United Airlines
Deal found 6/15![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 6/13. 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 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $470 (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 18, 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
Wed 8/26
6:45 pm-7:05 am
2 stops35h 20m
Montreal Pierre Elliott Trudeau Intl
Mon 8/31
7:00 am-11:46 am
1 stop5h 46m
$602
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
Fri 8/28
6:30 am-11:30 pm
1 stop16h 00m
Montreal Pierre Elliott Trudeau Intl
Mon 8/31
7:00 am-11:46 am
1 stop5h 46m
$630
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Mon 8/31
5:30 pm-11:30 pm
1 stop5h 00m
Montreal Pierre Elliott Trudeau Intl
Wed 9/2
9:30 am-8:42 pm
2 stops12h 12m
$641
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
Fri 8/28
8:50 am-5:30 pm
1 stop7h 40m
Montreal Pierre Elliott Trudeau Intl
Mon 8/31
4:55 pm-6:42 pm
Nonstop2h 47m
$647
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Sat 9/19
8:00 am-7:45 pm
2 stops10h 45m
Montreal Pierre Elliott Trudeau Intl
Sat 9/26
2:20 pm-9:21 pm
2 stops8h 01m
$647
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Thu 8/27
7:00 am-4:10 pm
1 stop8h 10m
Montreal Pierre Elliott Trudeau Intl
Sun 8/30
2:10 pm-8:22 pm
1 stop7h 12m
$660
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 9/1
8:00 am-7:45 pm
2 stops10h 45m
Montreal Pierre Elliott Trudeau Intl
Fri 9/4
6:00 am-3:38 pm
2 stops10h 38m
$662
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 7/17
9:20 am-5:30 pm
1 stop7h 10m
Montreal Pierre Elliott Trudeau Intl
Mon 7/20
1:10 pm-8:22 pm
2 stops8h 12m
$665
Showing 1-10 of 17 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 18, 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.
Weekly flight availability from St. Louis to Montreal
Explore weekly flight availability from St. Louis to Montreal. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 18, 2026.
The most flights from STL to YMQ are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).
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 18, 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.
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
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.
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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 18, 2026.
St. Louis and Montreal flights
Browse other St. Louis and Montreal flight options. Last updated on June 18, 2026.
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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 18, 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% |