$185+ 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Aug 14 — Aug 211
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
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 July 15, 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 July 15, 2026.
This American Airlines deal was found by Cheapflights users on 7/11. 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 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 50m
American Airlines
Fri 8/215:34 pm
YUL
- STL
1 stop15h 50m
American Airlines
Deal found 7/11![American Airlines logo]()
$427
This American Airlines deal was found by Cheapflights users on 7/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
STL
- YUL
1 stop9h 50m
American Airlines
Tue 9/112:30 pm
YUL
- STL
1 stop12h 44m
American Airlines
Deal found 7/11![American Airlines logo]()
$432
This Gotogate deal was found by Cheapflights users on 7/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2012:10 pm
STL
- YUL
Nonstop2h 32m
Air Canada
Mon 8/244:55 pm
YUL
- STL
Nonstop2h 47m
Air Canada
Deal found 7/10![Air Canada logo]()
$523
This American Airlines deal was found by Cheapflights users on 7/10. 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 10/194:15 pm
STL
- YUL
1 stop16h 37m
American Airlines
Fri 10/235:34 pm
YUL
- STL
1 stop18h 17m
American Airlines
Deal found 7/10![American Airlines logo]()
$528
This Kiwi.com deal was found by Cheapflights users on 7/11. 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.
Mon 8/174:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Tue 8/256:00 am
YUL
- STL
1 stop4h 37m
Multiple Airlines
Deal found 7/11![Multiple Airlines logo]()
$532
This American Airlines deal was found by Cheapflights users on 7/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:45 pm
STL
- YUL
1 stop17h 41m
American Airlines
Tue 10/65:34 pm
YUL
- STL
1 stop18h 17m
American Airlines
Deal found 7/11![American Airlines logo]()
$534
This Booking.com deal was found by Cheapflights users on 7/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/252:40 pm
STL
- YUL
1 stop4h 47m
Air Canada
Tue 9/14:55 pm
YUL
- STL
Nonstop2h 47m
Air Canada
Deal found 7/11![Air Canada logo]()
$537
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 July 15, 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 July 15, 2026.
This United deal was found by Cheapflights users on 7/11. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/139:30 am
STL
- YUL
1 stop5h 40m
Multiple Airlines
Tue 10/204:55 pm
YUL
- STL
Nonstop2h 46m
Multiple Airlines
Deal found 7/11![Multiple Airlines logo]()
$620
This Delta deal was found by Cheapflights users on 7/11. 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.
Tue 8/186:00 am
STL
- YUL
2 stops11h 54m
Delta
Wed 8/269:30 am
YUL
- STL
2 stops12h 12m
Delta
Deal found 7/11![Delta logo]()
$677
This Air Canada deal was found by Cheapflights users on 7/14. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3012:10 pm
STL
- YUL
Nonstop2h 32m
Air Canada
Tue 9/14:55 pm
YUL
- STL
Nonstop2h 47m
Air Canada
Deal found 7/14![Air Canada logo]()
$718
This United Airlines deal was found by Cheapflights users on 7/10. 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.
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 7/10![United Airlines logo]()
$726
This United deal was found by Cheapflights users on 7/11. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:25 am
STL
- YUL
1 stop9h 05m
Multiple Airlines
Wed 8/264:55 pm
YUL
- STL
Nonstop2h 47m
Multiple Airlines
Deal found 7/11![Multiple Airlines logo]()
$625
This Kiwi.com deal was found by Cheapflights users on 7/14. 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.
Fri 9/46:17 pm
STL
- YUL
2 stops48h 01m
Multiple Airlines
Sun 9/136:47 pm
YUL
- STL
1 stop5h 55m
Multiple Airlines
Deal found 7/14![Multiple Airlines logo]()
$635
This Delta deal was found by Cheapflights users on 7/11. 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.
Thu 7/233:58 pm
STL
- YUL
1 stop6h 54m
Delta
Mon 7/276:47 pm
YUL
- STL
1 stop6h 06m
Delta
Deal found 7/11![Delta logo]()
$726
This United Airlines deal was found by Cheapflights users on 7/10. 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 8/86:01 am
STL
- YUL
1 stop6h 08m
United Airlines
Mon 8/104:55 pm
YUL
- STL
Nonstop2h 47m
United Airlines
Deal found 7/10![United Airlines logo]()
$726
This Delta deal was found by Cheapflights users on 7/14. 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.
Sat 8/2910:31 am
STL
- YUL
2 stops11h 59m
Delta
Sat 9/59:30 am
YUL
- STL
2 stops12h 12m
Delta
Deal found 7/14![Delta logo]()
$744
Last-minute flights from St. Louis to MontrealDiscover last-minute flight deals from St. Louis to Montreal. Data last updated July 15, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Montreal. Data last updated July 15, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 7/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2012:10 pm
STL
- YUL
Nonstop2h 32m
Air Canada
Sat 7/254:40 pm
YUL
- STL
1 stop4h 42m
Air Canada
Deal found 7/13![Air Canada logo]()
$811
This Vliegwinkel deal was found by Cheapflights users on 7/10. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:20 am
STL
- YUL
1 stop13h 06m
Air Canada
Fri 7/244:55 pm
YUL
- STL
Nonstop2h 47m
Air Canada
Deal found 7/10![Air Canada logo]()
$662
This United deal was found by Cheapflights users on 7/10. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2311:25 am
STL
- YUL
1 stop5h 05m
Multiple Airlines
Fri 7/244:55 pm
YUL
- STL
Nonstop2h 47m
Multiple Airlines
Deal found 7/10![Multiple Airlines logo]()
$695
This United Airlines deal was found by Cheapflights users on 7/10. 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.
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 7/10![United Airlines logo]()
$726
This Delta deal was found by Cheapflights users on 7/13. 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.
Thu 7/233:58 pm
STL
- YUL
1 stop6h 54m
Delta
Mon 7/276:47 pm
YUL
- STL
1 stop6h 06m
Delta
Deal found 7/13![Delta logo]()
$737
This American Airlines deal was found by Cheapflights users on 7/12. 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.
Thu 7/233:20 pm
STL
- YUL
1 stop17h 28m
American Airlines
Mon 7/2710:30 am
YUL
- STL
1 stop11h 25m
American Airlines
Deal found 7/12![American Airlines logo]()
$769
This Kiwi.com deal was found by Cheapflights users on 7/10. 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.
Thu 7/2310:51 am
STL
- YUL
1 stop12h 01m
WestJet
Fri 7/246:45 am
YUL
- STL
2 stops7h 20m
WestJet
Deal found 7/10![WestJet logo]()
$772
This United Airlines deal was found by Cheapflights users on 7/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/231:13 pm
STL
- YUL
1 stop7h 13m
United Airlines
Fri 7/246:10 am
YUL
- STL
1 stop5h 24m
United Airlines
Deal found 7/11![United Airlines logo]()
$781
This FlightHub deal was found by Cheapflights users on 7/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2310:51 am
STL
- YUL
1 stop12h 01m
WestJet
Mon 7/275:45 pm
YUL
- STL
2 stops25h 08m
WestJet
Deal found 7/10![WestJet logo]()
$804
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 July 15, 2026.
Search for one-way flight options from St. Louis to Montreal. Find affordable one-way fares based on user searches. Data last updated July 15, 2026.
This American Airlines deal was found by Cheapflights users on 7/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/77:29 am
STL
- YUL
1 stop8h 23m
American Airlines
Deal found 7/11![American Airlines logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 7/10. 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.
Wed 10/710:35 am
STL
- YUL
3 stops36h 50m
Multiple Airlines
Deal found 7/10![Multiple Airlines logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 7/13. 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.
Wed 8/124:57 pm
STL
- YUL
3 stops25h 35m
Multiple Airlines
Deal found 7/13![Multiple Airlines logo]()
$227
This Kiwi.com deal was found by Cheapflights users on 7/14. 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.
Fri 8/74:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Deal found 7/14![Multiple Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 7/12. 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 10/76:40 am
STL
- YUL
2 stops11h 19m
Delta
Deal found 7/12![Delta logo]()
$265
This Kiwi.com deal was found by Cheapflights users on 7/10. 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 7/274:57 pm
STL
- YUL
2 stops24h 18m
Multiple Airlines
Deal found 7/10![Multiple Airlines logo]()
$276
This Air Canada deal was found by Cheapflights users on 7/10. 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.
Mon 7/2712:10 pm
STL
- YUL
Nonstop2h 32m
Air Canada
Deal found 7/10![Air Canada logo]()
$281
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 July 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $427 (American Airlines) |
One-way from | $185 (American Airlines) |
Popular in | March |
Cheapest in | February |
Average price | $617 |
Good round-trip deal | $665 or less |
Good one-way deal | $322 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 July 15, 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 10/13
9:30 am-4:10 pm
1 stop5h 40m
Montreal Pierre Elliott Trudeau Intl
Tue 10/20
4:55 pm-6:41 pm
Nonstop2h 46m
$620
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 8/18
7:25 am-5:30 pm
1 stop9h 05m
Montreal Pierre Elliott Trudeau Intl
Wed 8/26
4:55 pm-6:42 pm
Nonstop2h 47m
$625
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Fri 9/4
6:17 pm-7:18 pm
2 stops48h 01m
Montreal Pierre Elliott Trudeau Intl
Sun 9/13
6:47 pm-11:42 pm
1 stop5h 55m
$635
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Tue 8/18
6:00 am-6:54 pm
2 stops11h 54m
Montreal Pierre Elliott Trudeau Intl
Wed 8/26
9:30 am-8:42 pm
2 stops12h 12m
$677
Quickest round-trip
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Sun 8/30
12:10 pm-3:42 pm
Nonstop2h 32m
Montreal Pierre Elliott Trudeau Intl
Tue 9/1
4:55 pm-6:42 pm
Nonstop2h 47m
$718
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Thu 7/23
9:20 am-5:30 pm
1 stop7h 10m
Montreal Pierre Elliott Trudeau Intl
Sun 7/26
6:10 am-12:11 pm
1 stop7h 01m
$726
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Thu 7/23
3:58 pm-11:52 pm
1 stop6h 54m
Montreal Pierre Elliott Trudeau Intl
Mon 7/27
6:47 pm-11:53 pm
1 stop6h 06m
$726
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Sat 8/8
6:01 am-1:09 pm
1 stop6h 08m
Montreal Pierre Elliott Trudeau Intl
Mon 8/10
4:55 pm-6:42 pm
Nonstop2h 47m
$726
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Sat 8/29
10:31 am-11:30 pm
2 stops11h 59m
Montreal Pierre Elliott Trudeau Intl
Sat 9/5
9:30 am-8:42 pm
2 stops12h 12m
$744
Cheapest one-way
Quickest one-way
St. LouisMontreal
STL - YUL
STLYUL
Lambert-St Louis
Wed 10/7
7:29 am-4:52 pm
1 stop8h 23m
$185
Showing 1-10 of 14 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 July.
| 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 July 15, 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 July 15, 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 July 15, 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.
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Entertainment
7.8
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.
Alternative routes
Complete your trip
Flights by cabin class
Montreal flight routes
Other flight options
Other flights from St. Louis
Popular flights
Alternative routes for St. Louis to Montreal
See prices for flight routes from nearby airports that may be better suited for you.
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 July 15, 2026.
St. Louis and Montreal flights
Browse other St. Louis and Montreal flight options. Last updated on July 15, 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 July 15, 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 July 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$257 | Average$639 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$296 | Average$754 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$348 | Average$683 | FlexibilityNo cancel fee | On-time71% |