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$109+ 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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
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 December 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/2210:40 amSTL - YUL
1 stop12h 50mMultiple Airlines
Sat 12/277:00 amYUL - STL
1 stop11h 30mMultiple Airlines
Deal found 12/20$851
This Delta deal was found by Cheapflights users on 12/20. 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 12/306:00 amSTL - YUL
1 stop10h 15mDelta
Thu 1/82:45 pmYUL - STL
1 stop6h 52mDelta
Deal found 12/20$873
This American Airlines deal was found by Cheapflights users on 12/20. 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 12/314:53 pmSTL - YUL
1 stop21h 17mAmerican Airlines
Mon 1/57:08 amYUL - STL
1 stop17h 47mAmerican Airlines
Deal found 12/20$967
This American Airlines deal was found by Cheapflights users on 12/21. 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 12/279:08 amSTL - YUL
1 stop5h 02mAmerican Airlines
Wed 12/3112:59 pmYUL - STL
1 stop9h 07mAmerican Airlines
Deal found 12/21$983
This American Airlines deal was found by Cheapflights users on 12/20. 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 12/268:01 pmSTL - YUL
1 stop18h 09mAmerican Airlines
Sun 12/2812:59 pmYUL - STL
1 stop9h 12mAmerican Airlines
Deal found 12/20$1,024
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/268:42 pmSTL - YUL
2 stops26h 48mMultiple Airlines
Fri 1/26:20 pmYUL - STL
1 stop6h 22mMultiple Airlines
Deal found 12/21$1,088
This Delta deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:59 pmSTL - YUL
1 stop4h 20mDelta
Sun 12/2812:50 pmYUL - STL
1 stop8h 51mDelta
Deal found 12/21$1,110
This United Airlines deal was found by Cheapflights users on 12/20. 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 12/3011:05 amSTL - YUL
2 stops7h 43mUnited Airlines
Thu 1/82:13 pmYUL - STL
2 stops9h 45mUnited Airlines
Deal found 12/20$1,121

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 December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$308
(Kiwi.com)

One-way from

$109
(Kiwi.com)

Popular in

October

Cheapest in

June

Average price

$691

Good round-trip deal

$724 or less

Good one-way deal

$366 or less
Provider with most accurate pricing for Lambert-St Louis-Montreal (YMQ) flight deals.
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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. 15% potential increase in price ($107 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 23, 2025.
Use the filters below to find and compare flights from St. Louis to Montreal that are best for you.

Fly from

St. Louis

Fly to

Montreal

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/19

6:33 pm-3:05 pm

1 stop19h 32m

Montreal Pierre Elliott Trudeau Intl

Tue 2/24

3:55 pm-9:29 am

1 stop18h 34m

$349

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/2

6:44 pm-3:08 pm

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

7:30 am-6:14 pm

2 stops11h 44m

$358

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 2/4

6:00 am-3:08 pm

1 stop8h 08m

Montreal Pierre Elliott Trudeau Intl

Wed 2/11

3:50 pm-9:34 am

1 stop18h 44m

$422

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/26

6:00 am-3:05 pm

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

3:55 pm-9:29 am

1 stop18h 34m

$427

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 1/19

5:11 pm-12:43 am

2 stops30h 32m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

6:02 pm-6:51 am

1 stop13h 49m

$486

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

6:00 am-3:08 pm

1 stop8h 08m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

3:50 pm-10:20 am

1 stop19h 30m

$497

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

5:32 pm-8:44 am

1 stop14h 12m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

7:30 pm-12:33 pm

1 stop18h 03m

$514

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 1/21

6:25 am-6:37 pm

1 stop11h 12m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

7:30 pm-12:36 pm

1 stop18h 06m

$514

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

6:25 am-6:37 pm

1 stop11h 12m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

7:30 pm-12:36 pm

1 stop18h 06m

$514

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/3

5:42 pm-5:00 pm

2 stops22h 18m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/20

Showing 1-10 of 18 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Montreal flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, July is the cheapest month in which you can book a flight from St. Louis to Montreal (average of $218). Flying from St. Louis to Montreal in February is currently the most expensive (average of $1,289). 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 December 23, 2025.

A simple way to save on the total cost of your ticket is to fly from St. Louis to Montreal in the evening. If you’re flexible enough to do this you can expect to save up to 74% on your trip compared to booking a flight at noon.

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 December 23, 2025.
Read through reviews of airlines operating flights from St. Louis to Montreal, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,015 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,106 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,051 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,551 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 0 outbound flights to Montreal per day from 4 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?

    American Airlines can get you from St. Louis to Montreal in just under 19h 32m. 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 $212. Other airlines that can offer you cheap pricing are United Airlines, from $246, and Air Canada, from $285. Delta is currently priced 65% 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 $266. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $431 on average, our data indicates $1,281 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, July is the cheapest month in which you can book a flight from St. Louis to Montreal (average of $218). Flying from St. Louis to Montreal in February is currently the most expensive (average of $1,289). 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

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Top 4 airlines flying from St. Louis to Montreal

Discover the top 4 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$246Average$765FlexibilityNo cancel feeOn-time69%
DeltaCheapest$255Average$681FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$318Average$715FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$348Average$617FlexibilityNo cancel feeOn-time71%

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