$223+ 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 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Jun 26 — Jul 31
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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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
Cheapest
Best
Last-minute
One-way
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 May 27, 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 May 27, 2026.
This Booking.com deal was found by Cheapflights users on 5/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/201:20 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Mon 6/226:30 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 5/24![Air Canada logo]()
$473
This Gotogate deal was found by Cheapflights users on 5/25. 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.
Sat 6/131:05 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Mon 6/156:30 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 5/25![Air Canada logo]()
$476
This American Airlines deal was found by Cheapflights users on 5/26. 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 6/237:03 am
STL
- YUL
1 stop8h 48m
American Airlines
Tue 6/305:33 pm
YUL
- STL
1 stop15h 58m
American Airlines
Deal found 5/26![American Airlines logo]()
$518
This Gotogate deal was found by Cheapflights users on 5/24. 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.
Thu 7/98:55 am
STL
- YUL
1 stop8h 05m
Air Canada
Thu 7/168:40 am
YUL
- STL
2 stops6h 22m
Air Canada
Deal found 5/24![Air Canada logo]()
$522
This American Airlines deal was found by Cheapflights users on 5/24. 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 6/107:30 am
STL
- YUL
1 stop14h 29m
American Airlines
Wed 6/1712:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 5/24![American Airlines logo]()
$525
This American Airlines deal was found by Cheapflights users on 5/26. 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 8/188:07 pm
STL
- YUL
1 stop14h 36m
American Airlines
Sat 8/2212:30 pm
YUL
- STL
1 stop12h 28m
American Airlines
Deal found 5/26![American Airlines logo]()
$544
This Air Canada deal was found by Cheapflights users on 5/27. 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 6/161:05 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Thu 6/186:30 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 5/27![Air Canada 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 May 27, 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 May 27, 2026.
This Delta deal was found by Cheapflights users on 5/25. 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.
Tue 6/237:08 am
STL
- YUL
2 stops10h 46m
Delta
Tue 6/307:00 am
YUL
- STL
1 stop8h 52m
Delta
Deal found 5/25![Delta logo]()
$584
This United Airlines deal was found by Cheapflights users on 5/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/151:13 pm
STL
- YUL
2 stops10h 00m
United Airlines
Sat 6/206:00 am
YUL
- STL
2 stops10h 46m
United Airlines
Deal found 5/23![United Airlines logo]()
$588
This United Airlines deal was found by Cheapflights users on 5/26. 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 11/166:30 am
STL
- YUL
1 stop5h 40m
United Airlines
Wed 11/183:00 pm
YUL
- STL
1 stop9h 25m
United Airlines
Deal found 5/26![United Airlines logo]()
$589
This Delta deal was found by Cheapflights users on 5/24. 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.
Thu 10/82:18 pm
STL
- YUL
1 stop7h 52m
Delta
Mon 10/126:15 pm
YUL
- STL
1 stop6h 24m
Delta
Deal found 5/24![Delta logo]()
$594
This United Airlines deal was found by Cheapflights users on 5/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2910:20 am
STL
- YUL
1 stop6h 10m
United Airlines
Sun 8/26:10 am
YUL
- STL
1 stop7h 01m
United Airlines
Deal found 5/22![United Airlines logo]()
$594
This United Airlines deal was found by Cheapflights users on 5/25. 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.
Fri 9/189:40 am
STL
- YUL
1 stop6h 50m
United Airlines
Sun 9/206:00 am
YUL
- STL
1 stop6h 17m
United Airlines
Deal found 5/25![United Airlines logo]()
$594
This United Airlines deal was found by Cheapflights users on 5/26. 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 7/158:43 am
STL
- YUL
1 stop4h 57m
United Airlines
Sat 7/186:10 am
YUL
- STL
1 stop7h 01m
United Airlines
Deal found 5/26![United Airlines logo]()
$594
This United Airlines deal was found by Cheapflights users on 5/25. 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 7/299:30 am
STL
- YUL
1 stop7h 00m
United Airlines
Sat 8/16:00 am
YUL
- STL
2 stops10h 46m
United Airlines
Deal found 5/25![United Airlines logo]()
$604
This United Airlines deal was found by Cheapflights users on 5/25. 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.
Fri 9/410:53 am
STL
- YUL
1 stop5h 37m
United Airlines
Mon 9/76:00 am
YUL
- STL
2 stops10h 38m
United Airlines
Deal found 5/25![United Airlines logo]()
$604
Last-minute flights from St. Louis to MontrealDiscover last-minute flight deals from St. Louis to Montreal. Data last updated May 27, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Montreal. Data last updated May 27, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 5/25. 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 6/82:15 pm
STL
- YUL
1 stop6h 35m
Air Canada
Fri 6/126:30 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 5/25![Air Canada logo]()
$561
This American Airlines deal was found by Cheapflights users on 5/24. 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 6/107:30 am
STL
- YUL
1 stop14h 29m
American Airlines
Wed 6/1712:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 5/24![American Airlines logo]()
$525
This Gotogate deal was found by Cheapflights users on 5/25. 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.
Sat 6/131:05 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Mon 6/156:30 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 5/25![Air Canada logo]()
$476
This Mytrip deal was found by Cheapflights users on 5/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/132:15 pm
STL
- YUL
1 stop6h 35m
Multiple Airlines
Mon 6/156:30 am
YUL
- STL
3 stops13h 06m
Multiple Airlines
Deal found 5/25![Multiple Airlines logo]()
$557
This Air Canada deal was found by Cheapflights users on 5/27. 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 6/161:05 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Thu 6/186:30 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 5/27![Air Canada logo]()
$547
This American Airlines deal was found by Cheapflights users on 5/27. 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 6/162:26 pm
STL
- YUL
1 stop18h 24m
American Airlines
Thu 6/1812:30 pm
YUL
- STL
1 stop12h 46m
American Airlines
Deal found 5/27![American Airlines logo]()
$572
This Booking.com deal was found by Cheapflights users on 5/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/201:20 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Mon 6/226:30 pm
YUL
- STL
Nonstop2h 55m
Air Canada
Deal found 5/24![Air Canada logo]()
$473
This American Airlines deal was found by Cheapflights users on 5/26. 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 6/237:03 am
STL
- YUL
1 stop8h 48m
American Airlines
Tue 6/305:33 pm
YUL
- STL
1 stop15h 58m
American Airlines
Deal found 5/26![American Airlines logo]()
$518
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 May 27, 2026.
Search for one-way flight options from St. Louis to Montreal. Find affordable one-way fares based on user searches. Data last updated May 27, 2026.
This Air Canada deal was found by Cheapflights users on 5/26. 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 7/108:55 am
STL
- YUL
1 stop6h 57m
Air Canada
Deal found 5/26![Air Canada logo]()
$223
This American Airlines deal was found by Cheapflights users on 5/25. 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 10/77:38 am
STL
- YUL
1 stop7h 47m
American Airlines
Deal found 5/25![American Airlines logo]()
$243
This Air Canada deal was found by Cheapflights users on 5/24. 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.
Sat 6/271:20 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Deal found 5/24![Air Canada logo]()
$258
This Delta deal was found by Cheapflights users on 5/24. 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.
Sat 6/276:10 pm
STL
- YUL
1 stop4h 18m
Delta
Deal found 5/24![Delta logo]()
$268
This United Airlines deal was found by Cheapflights users on 5/25. 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 10/76:00 am
STL
- YUL
2 stops7h 40m
United Airlines
Deal found 5/25![United Airlines logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 5/24. 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 6/275:06 pm
STL
- YUL
3 stops18h 04m
Multiple Airlines
Deal found 5/24![Multiple Airlines logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 5/24. 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 6/295:06 pm
STL
- YUL
3 stops18h 04m
Multiple Airlines
Deal found 5/24![Multiple Airlines logo]()
$291
This oojo deal was found by Cheapflights users on 5/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:00 am
STL
- YUL
2 stops9h 45m
WestJet
Deal found 5/26![WestJet logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 5/25. 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 7/35:06 pm
STL
- YUL
3 stops18h 04m
Multiple Airlines
Deal found 5/25![Multiple Airlines logo]()
$296
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 May 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $473 (Booking.com) |
One-way from | $223 (Air Canada) |
Popular in | October |
Cheapest in | June |
Average price | $623 |
Good round-trip deal | $1,001 or less |
Good one-way deal | $359 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 May 27, 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
Tue 6/23
7:08 am-6:54 pm
2 stops10h 46m
Montreal Pierre Elliott Trudeau Intl
Tue 6/30
7:00 am-2:52 pm
1 stop8h 52m
$584
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Mon 6/15
1:13 pm-12:13 am
2 stops10h 00m
Montreal Pierre Elliott Trudeau Intl
Sat 6/20
6:00 am-3:46 pm
2 stops10h 46m
$588
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Mon 11/16
6:30 am-1:10 pm
1 stop5h 40m
Montreal Pierre Elliott Trudeau Intl
Wed 11/18
3:00 pm-11:25 pm
1 stop9h 25m
$589
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Thu 10/8
2:18 pm-11:10 pm
1 stop7h 52m
Montreal Pierre Elliott Trudeau Intl
Mon 10/12
6:15 pm-11:39 pm
1 stop6h 24m
$594
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 7/29
10:20 am-5:30 pm
1 stop6h 10m
Montreal Pierre Elliott Trudeau Intl
Sun 8/2
6:10 am-12:11 pm
1 stop7h 01m
$594
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 9/18
9:40 am-5:30 pm
1 stop6h 50m
Montreal Pierre Elliott Trudeau Intl
Sun 9/20
6:00 am-11:17 am
1 stop6h 17m
$594
Quickest round-trip
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 7/15
8:43 am-2:40 pm
1 stop4h 57m
Montreal Pierre Elliott Trudeau Intl
Sat 7/18
6:10 am-12:11 pm
1 stop7h 01m
$594
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 7/29
9:30 am-5:30 pm
1 stop7h 00m
Montreal Pierre Elliott Trudeau Intl
Sat 8/1
6:00 am-3:46 pm
2 stops10h 46m
$604
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 9/4
10:53 am-5:30 pm
1 stop5h 37m
Montreal Pierre Elliott Trudeau Intl
Mon 9/7
6:00 am-3:38 pm
2 stops10h 38m
$604
Cheapest one-way
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 10/7
7:38 am-4:25 pm
1 stop7h 47m
$243
Showing 1-10 of 18 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 May.
| 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 May 27, 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 May 27, 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).
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 May 27, 2026.
Read through reviews of airlines operating flights from St. Louis to Montreal, such as Delta,United 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
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Crew
8.5
Comfort
7.8
Food
7.2
Entertainment
7.8
Overall
7.9
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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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 May 27, 2026.
St. Louis and Montreal flights
Browse other St. Louis and Montreal flight options. Last updated on May 27, 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 May 27, 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 May 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$257 | Average$647 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$300 | Average$765 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$348 | Average$617 | FlexibilityNo cancel fee | On-time71% |