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$207+ 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 6/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Jul 1 — Jul 81
Wed 7/1
Wed 7/8
1 adult, Economy
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Cheap flight deals from St. Louis to Montreal

Cheapest flights from St. Louis to Montreal
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 1, 2026.

This Air Canada deal was found by Cheapflights users on 5/30. 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 6/141:05 pm
STL
-
YUL
Nonstop2h 35m
Air Canada
Wed 6/176:30 pm
YUL
-
STL
Nonstop2h 55m
Air Canada
Deal found 5/30$466
This American Airlines deal was found by Cheapflights users on 5/30. 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 8/262:55 pm
STL
-
YUL
1 stop17h 51m
American Airlines
Wed 9/210:31 am
YUL
-
STL
1 stop11h 13m
American Airlines
Deal found 5/30$511
This American Airlines deal was found by Cheapflights users on 5/29. 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 7/296:55 am
STL
-
YUL
1 stop8h 52m
American Airlines
Wed 8/1212:30 pm
YUL
-
STL
1 stop12h 44m
American Airlines
Deal found 5/29$541
This Air Canada deal was found by Cheapflights users on 5/30. 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 5/30$547
This American Airlines deal was found by Cheapflights users on 5/29. 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 7/306:55 am
STL
-
YUL
1 stop8h 52m
American Airlines
Wed 8/1210:31 am
YUL
-
STL
1 stop11h 13m
American Airlines
Deal found 5/29$553
This American Airlines deal was found by Cheapflights users on 6/1. 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 9/277:28 am
STL
-
YUL
1 stop14h 26m
American Airlines
Wed 9/3010:30 am
YUL
-
STL
1 stop11h 47m
American Airlines
Deal found 6/1$554
This American Airlines deal was found by Cheapflights users on 5/28. 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 7/78:41 pm
STL
-
YUL
1 stop19h 06m
American Airlines
Thu 7/97:17 am
YUL
-
STL
1 stop11h 04m
American Airlines
Deal found 5/28$555
This Air Canada deal was found by Cheapflights users on 5/30. 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
Fri 6/197:30 am
YUL
-
STL
1 stop5h 51m
Air Canada
Deal found 5/30$561
This Kiwi.com deal was found by Cheapflights users on 5/30. 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 8/265:33 pm
STL
-
YUL
2 stops24h 45m
Multiple Airlines
Wed 9/22:29 pm
YUL
-
STL
1 stop7h 02m
Multiple Airlines
Deal found 5/30$564
This Air Canada deal was found by Cheapflights users on 5/29. 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 7/712:10 pm
STL
-
YUL
Nonstop2h 32m
Air Canada
Thu 7/94:55 pm
YUL
-
STL
Nonstop2h 47m
Air Canada
Deal found 5/29$569

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 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$466
(Air Canada)

One-way from

$207
(Air Canada)

Popular in

March

Cheapest in

June

Average price

$303

Good round-trip deal

$1,001 or less

Good one-way deal

$403 or less
Provider with most accurate pricing for Lambert-St Louis-Montreal (YMQ) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Montreal (YMQ) flights.
Search Deals
From Lambert-St Louis to Montreal (YMQ)
Search Deals
One-way flight from Lambert-St Louis to Montreal (YMQ)
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Montreal (YMQ).
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Montreal (YMQ).
Search Deals

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 1, 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

Price

Cheapest round-trip

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
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 7/16

6:01 am-1:09 pm

1 stop6h 08m

Montreal Pierre Elliott Trudeau Intl

Sat 7/25

6:10 am-12:11 pm

1 stop7h 01m

$594

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 7/13

9:20 am-5:30 pm

1 stop7h 10m

Montreal Pierre Elliott Trudeau Intl

Sat 7/25

6:00 am-11:41 am

1 stop6h 41m

$594

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/28

9:20 am-5:30 pm

1 stop7h 10m

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

Sun 7/12

6:01 am-1:09 pm

1 stop6h 08m

Montreal Pierre Elliott Trudeau Intl

Sat 7/25

6:00 am-3:46 pm

2 stops10h 46m

$604

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 7/15

6:00 am-7:45 pm

2 stops12h 45m

Montreal Pierre Elliott Trudeau Intl

Wed 7/22

9:45 am-3:46 pm

1 stop7h 01m

$604

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 7/15

6:01 am-1:09 pm

1 stop6h 08m

Montreal Pierre Elliott Trudeau Intl

Thu 7/23

6:00 am-3:46 pm

2 stops10h 46m

$604

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/14

6:00 am-7:45 pm

2 stops12h 45m

Montreal Pierre Elliott Trudeau Intl

Thu 7/16

9:45 am-3:46 pm

1 stop7h 01m

$604

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 8/18

8:00 am-10:06 pm

2 stops13h 06m

Montreal Pierre Elliott Trudeau Intl

Fri 8/21

6:00 am-3:38 pm

2 stops10h 38m

$609

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 8/26

6:00 am-2:40 pm

2 stops7h 40m

Montreal Pierre Elliott Trudeau Intl

Wed 9/2

6:00 am-5:06 pm

2 stops12h 06m

$609

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/30

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

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.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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

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 1, 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 1, 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 June 1, 2026.
Read through reviews of airlines operating flights from St. Louis to Montreal, such as Delta and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,401 reviews

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.9
Good
8,401 reviews
Delta
7.9
Good
8,401 reviews

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Air Canada
7.1
Good
11,107 reviews
Delta
7.9
Good
8,401 reviews

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.8

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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.

  • What airport do you fly from for flights from St. Louis to Montreal?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Montreal. On average, Lambert-St Louis has 2 outbound flights to Montreal per day from 2 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from St. Louis to Montreal?

    United Airlines can get you from St. Louis to Montreal in just under 6h 10m. Your travel time can differ by up to . St. Louis and Montreal are separated by a distance of 967 mi.

  • What are the cheapest airlines flying from St. Louis to Montreal round-trip?

    Cheapflights users have booked flights from St. Louis to Montreal round-trip from $257. Another airline that can offer you cheap pricing is American Airlines. Air Canada is currently priced 57% below the average price you’ll pay for this route.

  • What are the cheapest flights from St. Louis to Montreal?

    Looking at all options, your cheapest flight can be booked for $257. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $526 on average, our data indicates $972 when flying from St. Louis to Montreal.

  • Can I find deals for flights from St. Louis to Montreal that include hotel bookings?

    Yes. In addition to deals on St. Louis to Montreal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Montreal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Montreal.

  • Can I find deals for business class flights from St. Louis to Montreal?

    Yes. Cheapflights offers flight deals from St. Louis to Montreal by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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.

See more FAQs

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.

Top 2 airlines flying from St. Louis to Montreal

Discover the top 2 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 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$257Average$624FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$348Average$617FlexibilityNo cancel feeOn-time71%

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