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$148+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Apr 29 — May 61
Tue 4/29
Tue 5/6
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 83 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 24, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$384
(American Airlines)

One-way from

$148
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$578

Good round-trip deal

$971 or less

Good one-way deal

$487 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. 4% potential increase in price ($29 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($16 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 24, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/22. 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.
Tue 5/135:45 pmSTL - YUL
2 stops29h 52mMultiple Airlines
Tue 5/206:45 amYUL - STL
1 stop17h 59mMultiple Airlines
Deal found 4/22$376
This American Airlines deal was found by Cheapflights users on 4/23. 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 5/2910:31 amSTL - YUL
1 stop24h 13mAmerican Airlines
Mon 6/212:30 pmYUL - STL
1 stop12h 21mAmerican Airlines
Deal found 4/23$384
This Delta deal was found by Cheapflights users on 4/22. 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 5/292:15 pmSTL - YUL
1 stop8h 01mDelta
Mon 6/25:00 pmYUL - STL
1 stop16h 07mDelta
Deal found 4/22$461
This United Airlines deal was found by Cheapflights users on 4/22. 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 5/136:30 amSTL - YUL
2 stops10h 55mUnited Airlines
Tue 5/208:00 pmYUL - STL
2 stops20h 47mUnited Airlines
Deal found 4/22$506
This Gotogate deal was found by Cheapflights users on 4/23. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/291:30 pmSTL - YUL
Nonstop2h 30mAir Canada
Mon 6/26:10 pmYUL - STL
Nonstop2h 48mAir Canada
Deal found 4/23$572

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 24, 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 5/13

5:45 pm-12:37 am

2 stops29h 52m

Montreal Pierre Elliott Trudeau Intl

Tue 5/20

6:45 am-11:44 pm

1 stop17h 59m

$376

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/29

10:31 am-11:44 am

1 stop24h 13m

Montreal Pierre Elliott Trudeau Intl

Mon 6/2

12:30 pm-11:51 pm

1 stop12h 21m

$384

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/29

2:15 pm-11:16 pm

1 stop8h 01m

Montreal Pierre Elliott Trudeau Intl

Mon 6/2

5:00 pm-8:07 am

1 stop16h 07m

$461

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/13

6:30 am-6:25 pm

2 stops10h 55m

Montreal Pierre Elliott Trudeau Intl

Tue 5/20

8:00 pm-3:47 pm

2 stops20h 47m

$506

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/29

1:30 pm-5:00 pm

Nonstop2h 30m

Montreal Pierre Elliott Trudeau Intl

Mon 6/2

6:10 pm-7:58 pm

Nonstop2h 48m

$572

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/12

5:45 pm-2:20 pm

1 stop19h 35m

$148

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/3

7:30 pm-11:44 am

1 stop15h 14m

$165

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/14

3:30 pm-11:24 pm

1 stop6h 54m

$213

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/3

5:00 am-6:25 pm

2 stops12h 25m

$227

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/17

1:30 pm-5:00 pm

Nonstop2h 30m

$265

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

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*2 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

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 April 18, 2025.

The best time to book flights from St. Louis to Montreal is 83 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 24, 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 24, 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
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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
7,920 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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
8,685 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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
9,192 reviews
Delta
8.0
Very good
7,920 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

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 5 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 $384. Other airlines that can offer you cheap pricing are Delta, from $481, and Air Canada, from $572. American Airlines is currently priced 38% 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 $165. 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 cheapest flights from St. Louis to Montreal?

    Looking at all options, your cheapest flight can be booked for $265. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $376 on average our data indicates $2,210 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 5 airlines flying from St. Louis to Montreal

Discover the top 5 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 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$246Average$598FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$272Average$614FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$330Average$736FlexibilityNo cancel feeOn-time71%
DeltaCheapest$472Average$660FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$577Average$645FlexibilityNo cancel feeOn-time60%

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