HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Montreal

$255+ 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 6/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
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

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 January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$359
(Kiwi.com)

One-way from

$255
(Kiwi.com)

Popular in

October

Cheapest in

June

Good round-trip deal

$696 or less

Good one-way deal

$366 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. 15% potential increase in price ($112 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
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

Find 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 January 8, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/6. 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 1/218:22 pmSTL - YUL
2 stops41h 32mMultiple Airlines
Sat 1/244:35 pmYUL - STL
1 stop7h 58mMultiple Airlines
Deal found 1/6$359
This American Airlines deal was found by Cheapflights users on 1/7. 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 2/186:36 pmSTL - YUL
1 stop19h 28mAmerican Airlines
Mon 2/233:45 pmYUL - STL
1 stop18h 48mAmerican Airlines
Deal found 1/7$362
This American Airlines deal was found by Cheapflights users on 1/6. 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 2/196:36 pmSTL - YUL
1 stop19h 28mAmerican Airlines
Wed 2/253:45 pmYUL - STL
1 stop9h 03mAmerican Airlines
Deal found 1/6$363
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 1/2412:12 pmSTL - YUL
1 stop11h 18mMultiple Airlines
Tue 1/277:30 pmYUL - STL
2 stops50h 36mMultiple Airlines
Deal found 1/8$380
This Expedia deal was found by Cheapflights users on 1/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/264:05 pmSTL - YUL
2 stops13h 30mAir Canada
Fri 2/2710:10 amYUL - STL
1 stop6h 19mAir Canada
Deal found 1/6$407
This American Airlines deal was found by Cheapflights users on 1/6. 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 2/266:00 amSTL - YUL
1 stop8h 04mAmerican Airlines
Mon 3/23:45 pmYUL - STL
1 stop18h 48mAmerican Airlines
Deal found 1/6$420
This Kiwi.com deal was found by Cheapflights users on 1/6. 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 4/27:43 pmSTL - YUL
2 stops27h 47mMultiple Airlines
Wed 4/84:35 pmYUL - STL
1 stop30h 58mMultiple Airlines
Deal found 1/6$424

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 January 8, 2026.
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

Wed 1/21

8:22 pm-2:54 pm

2 stops41h 32m

Montreal Pierre Elliott Trudeau Intl

Sat 1/24

4:35 pm-11:33 pm

1 stop7h 58m

$359

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 2/18

6:36 pm-3:04 pm

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

Mon 2/23

3:45 pm-9:33 am

1 stop18h 48m

$362

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/19

9:37 am-10:56 pm

2 stops12h 19m

Montreal Pierre Elliott Trudeau Intl

Wed 2/25

12:59 pm-11:48 pm

2 stops11h 49m

$378

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/24

12:12 pm-12:30 am

1 stop11h 18m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

6:45 am-11:33 pm

2 stops41h 48m

$396

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/26

6:00 am-3:04 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

3:45 pm-9:33 am

1 stop18h 48m

$420

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 4/2

7:43 pm-12:30 am

2 stops27h 47m

Montreal Pierre Elliott Trudeau Intl

Wed 4/8

4:35 pm-10:33 pm

1 stop30h 58m

$424

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 1/23

1:03 pm-7:05 am

2 stops17h 02m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$497

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/26

9:50 am-12:38 am

3 stops13h 48m

Montreal Pierre Elliott Trudeau Intl

Fri 2/27

10:10 am-3:29 pm

1 stop6h 19m

$505

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

4:49 pm-2:00 pm

1 stop20h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

1:10 pm-10:58 pm

1 stop10h 48m

$508

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

7:10 am-6:37 pm

2 stops10h 27m

$264

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 15 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 January.
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.

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 January 8, 2026.
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
8,029 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Crew

8.5

Food

7.2

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
8,029 reviews
Delta
7.9
Good
8,029 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Crew

8.5

Food

7.2

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
9,141 reviews
Delta
7.9
Good
8,029 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Crew

8.5

Food

7.2

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
11,095 reviews
Delta
7.9
Good
8,029 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Crew

8.5

Food

7.2

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
10,603 reviews
Delta
7.9
Good
8,029 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.8

Boarding

8.1

Crew

8.5

Food

7.2

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 28m. 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 64% 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 $380 on average, our data indicates $1,394 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 January 8, 2026.
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$650FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.