HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Montreal

$137+ 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$333
(American Airlines)

One-way from

$137
(American Airlines)

Popular in

February

Cheapest in

November

Average price

$602

Good round-trip deal

$721 or less

Good one-way deal

$508 or less
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. 12% potential increase in price ($87 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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

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 July 3, 2025.

This American Airlines deal was found by Cheapflights users on 7/1. 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.
Tue 9/28:01 pmSTL - YUL
1 stop14h 44mAmerican Airlines
Mon 9/85:15 pmYUL - STL
1 stop17h 11mAmerican Airlines
Deal found 7/1$333
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/36:35 amSTL - YUL
1 stop9h 51mUnited Airlines
Sat 9/68:20 amYUL - STL
1 stop8h 24mUnited Airlines
Deal found 7/1$402
This Mytrip deal was found by Cheapflights users on 7/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/142:30 pmSTL - YUL
3 stops21h 00mMultiple Airlines
Sun 8/174:45 pmYUL - STL
3 stops21h 47mMultiple Airlines
Deal found 7/1$409
This Delta deal was found by Cheapflights users on 7/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:00 amSTL - YUL
1 stop9h 07mDelta
Tue 9/96:00 amYUL - STL
1 stop10h 29mDelta
Deal found 7/1$431

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 3, 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

Tue 9/2

8:01 pm-11:45 am

1 stop14h 44m

Montreal Pierre Elliott Trudeau Intl

Wed 9/10

12:31 pm-8:32 pm

1 stop9h 01m

$333

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/3

6:35 am-5:26 pm

1 stop9h 51m

Montreal Pierre Elliott Trudeau Intl

Sat 9/13

8:20 am-3:44 pm

1 stop8h 24m

$402

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 8/14

2:30 pm-12:30 pm

3 stops21h 00m

Montreal Pierre Elliott Trudeau Intl

Sun 8/17

4:45 pm-1:32 pm

3 stops21h 47m

$409

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/4

6:00 am-4:07 pm

1 stop9h 07m

Montreal Pierre Elliott Trudeau Intl

Tue 9/9

6:00 am-3:29 pm

1 stop10h 29m

$431

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/14

7:53 pm-11:40 am

1 stop14h 47m

$137

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/18

10:35 am-12:27 am

2 stops12h 52m

$155

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 9/23

6:35 am-10:06 pm

2 stops14h 31m

$182

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/18

1:30 pm-5:00 pm

Nonstop2h 30m

$242

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/14

6:00 am-6:51 pm

2 stops11h 51m

$261

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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, January is the cheapest month in which you can book a flight from St. Louis to Montreal (average of $270). Flying from St. Louis to Montreal in July is currently the most expensive (average of $409). 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 3, 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 77% on your trip compared to booking a flight at noon.

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 3, 2025.

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 3, 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
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,681 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • 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 $333. Other airlines that can offer you cheap pricing are United Airlines, from $402, and Delta, from $431. American Airlines is currently priced 46% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from St. Louis to Montreal one-way?

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $137. However, be on the lookout for offers from United Airlines and Air Canada, as they are both options that can get you from St. Louis to Montreal for a low price.

  • What are the most reliable airlines from St. Louis to Montreal?

    Consider United Airlines (53%), Air Canada (27%) or Jazz (0%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Montreal.

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

    Looking at all options, your cheapest flight can be booked for $323. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $354 on average our data indicates $1,973 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, January is the cheapest month in which you can book a flight from St. Louis to Montreal (average of $270). Flying from St. Louis to Montreal in July is currently the most expensive (average of $409). 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$246Average$689FlexibilityNo cancel feeOn-time69%
DeltaCheapest$255Average$659FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$259Average$691FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$330Average$659FlexibilityNo 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.