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$204+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Montreal are usually found in November or August, booked 52 days in advance, depart on a Tuesday or Monday and return on a Monday

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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$407
(Mytrip)

One-way from

$204
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$566

Good round-trip deal

$999 or less

Good one-way deal

$663 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.
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From Lambert-St Louis to Montreal (YMQ)
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One-way flight from Lambert-St Louis to Montreal (YMQ)
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Highest demand for flights based on searches. 3% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Montreal (YMQ).
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Price to beat on a one-way flight from Lambert-St Louis to Montreal (YMQ).
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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 April 1, 2025.

This Mytrip deal was found by Cheapflights users on 3/31. 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.
Fri 4/2512:15 pmSTL - YUL
3 stops28h 47mMultiple Airlines
Wed 4/3010:10 amYUL - STL
3 stops32h 05mMultiple Airlines
Deal found 3/31$407
This Delta deal was found by Cheapflights users on 3/31. 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 6/36:00 amSTL - YUL
1 stop14h 09mDelta
Wed 6/116:00 amYUL - STL
1 stop15h 53mDelta
Deal found 3/31$512
This Bravofly deal was found by Cheapflights users on 3/31. 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/303:30 pmSTL - YUL
1 stop4h 51mAir Canada
Wed 5/286:10 pmYUL - STL
Nonstop2h 48mAir Canada
Deal found 3/31$517
This American Airlines deal was found by Cheapflights users on 3/31. 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 4/307:33 amSTL - YUL
1 stop8h 12mAmerican Airlines
Mon 5/265:35 pmYUL - STL
1 stop18h 08mAmerican Airlines
Deal found 3/31$549
This United Airlines deal was found by Cheapflights users on 3/31. 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 4/308:00 amSTL - YUL
1 stop5h 46mUnited Airlines
Mon 5/266:10 pmYUL - STL
Nonstop2h 48mUnited Airlines
Deal found 3/31$591
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 6/25:45 pmSTL - YUL
1 stop4h 31mWestJet
Sun 6/86:45 amYUL - STL
2 stops14h 52mWestJet
Deal found 3/31$667

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 April 1, 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

Fri 4/25

12:15 pm-6:02 pm

3 stops28h 47m

Montreal Pierre Elliott Trudeau Intl

Wed 4/30

10:10 am-5:15 pm

3 stops32h 05m

$407

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/3

6:00 am-9:09 pm

1 stop14h 09m

Montreal Pierre Elliott Trudeau Intl

Wed 6/11

6:00 am-8:53 pm

1 stop15h 53m

$512

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/30

3:30 pm-9:21 pm

1 stop4h 51m

Montreal Pierre Elliott Trudeau Intl

Wed 5/28

6:10 pm-7:58 pm

Nonstop2h 48m

$517

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/30

7:33 am-4:45 pm

1 stop8h 12m

Montreal Pierre Elliott Trudeau Intl

Mon 5/26

5:35 pm-10:43 am

1 stop18h 08m

$549

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/30

6:30 am-2:46 pm

1 stop7h 16m

Montreal Pierre Elliott Trudeau Intl

Sat 5/31

6:10 pm-7:58 pm

Nonstop2h 48m

$591

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 6/2

5:45 pm-11:16 pm

1 stop4h 31m

Montreal Pierre Elliott Trudeau Intl

Sun 6/8

6:45 am-8:37 pm

2 stops14h 52m

$667

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/29

9:50 am-12:37 am

3 stops13h 47m

$204

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 5/21

7:30 am-4:54 pm

2 stops8h 24m

$249

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/25

5:32 pm-11:59 pm

1 stop5h 27m

$291

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/29

5:45 am-4:45 pm

2 stops10h 00m

$296

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 11 results
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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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust 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

How far ahead should I book a flight from St. Louis to Montreal?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Montreal. Price data was last updated on March 28, 2025.

The best time to book flights from St. Louis to Montreal is 52 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 April 1, 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 79% on your trip compared to booking a flight at noon.

Rainfall in Montreal by month

Plan your trip to Montreal by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Montreal ranges from 2.5 - 4.4 inches per month. August is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Montreal when rainfall is around 2.5 in.

Temperature in Montreal by month

Plan your trip to Montreal by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Montreal, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 15.8 F).

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 April 1, 2025.
Delta
8.0
Very good
7,898 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,898 reviews
Delta
8.0
Very good
7,898 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,615 reviews
Delta
8.0
Very good
7,898 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,898 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
WestJet
7.2
Good
2,789 reviews
Delta
8.0
Very good
7,898 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Canada
7.0
Good
9,012 reviews
Delta
8.0
Very good
7,898 reviews

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • 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 $512. Other airlines that can offer you cheap pricing are Air Canada, from $517, and American Airlines, from $549. Delta is currently priced 19% 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 Air Canada, with whom users have recently found tickets for as low as $249. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from St. Louis to Montreal for a low price.

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

    Looking at all options, your cheapest flight can be booked for $254. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $382 on average our data indicates $2,264 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

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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 April 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$246Average$610FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$259Average$599FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$330Average$738FlexibilityNo cancel feeOn-time71%
DeltaCheapest$472Average$660FlexibilityNo cancel feeOn-timeN/A
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