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$141+ 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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YMQ
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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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 June 12, 2025.

Round-trip from

$402
(Mytrip)

One-way from

$141
(American Airlines)

Popular in

February

Cheapest in

August

Average price

$590

Good round-trip deal

$848 or less

Good one-way deal

$488 or less
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. 14% potential increase in price ($100 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/11. 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 9/187:23 amSTL - YUL
1 stop8h 07mAmerican Airlines
Tue 9/235:15 pmYUL - STL
1 stop17h 11mAmerican Airlines
Deal found 6/11$340
This Mytrip deal was found by Cheapflights users on 6/10. 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.
Mon 7/1410:47 amSTL - YUL
2 stops30h 08mMultiple Airlines
Mon 7/218:55 amYUL - STL
3 stops32h 36mMultiple Airlines
Deal found 6/10$402
This Delta deal was found by Cheapflights users on 6/12. 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.
Mon 8/116:00 amSTL - YUL
1 stop14h 48mDelta
Wed 8/205:05 pmYUL - STL
1 stop16h 01mDelta
Deal found 6/12$442
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Mon 8/115:30 pmSTL - YUL
1 stop17h 28mUnited Airlines
Tue 8/123:30 pmYUL - STL
2 stops19h 29mUnited Airlines
Deal found 6/12$548
This Air Canada deal was found by Cheapflights users on 6/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/241:30 pmSTL - YUL
Nonstop2h 30mAir Canada
Wed 6/257:00 amYUL - STL
1 stop6h 36mAir Canada
Deal found 6/10$585

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 June 12, 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

Mon 7/14

10:47 am-5:55 pm

2 stops30h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 7/21

8:55 am-4:31 pm

3 stops32h 36m

$402

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 8/11

6:45 pm-10:07 am

1 stop14h 22m

Montreal Pierre Elliott Trudeau Intl

Tue 8/19

6:00 am-8:57 pm

1 stop15h 57m

$442

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 8/11

7:59 pm-11:36 am

1 stop14h 37m

Montreal Pierre Elliott Trudeau Intl

Mon 8/18

12:30 pm-11:51 pm

1 stop12h 21m

$449

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 8/11

5:30 pm-11:58 am

1 stop17h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 8/12

3:30 pm-9:59 am

2 stops19h 29m

$548

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/24

1:30 pm-5:00 pm

Nonstop2h 30m

Montreal Pierre Elliott Trudeau Intl

Wed 6/25

7:00 am-12:36 pm

1 stop6h 36m

$585

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 8/27

12:00 pm-9:48 pm

1 stop8h 48m

$191

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 7/5

9:50 am-12:37 am

3 stops13h 47m

$199

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/1

5:47 pm-12:24 pm

2 stops17h 37m

$250

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 6/29

1:30 pm-5:00 pm

Nonstop2h 30m

$260

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 6/28

6:33 am-3:00 pm

2 stops7h 27m

$261

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 11 results
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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 June 12, 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 78% 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 June 12, 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).

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 June 12, 2025.
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

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
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

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
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

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
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

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!
WestJet
7.2
Good
2,868 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

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
9,537 reviews
Delta
8.0
Very good
7,946 reviews

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

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 $442. Other airlines that can offer you cheap pricing are American Airlines, from $449, and United Airlines, from $548. Delta is currently priced 27% 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 $141. However, be on the lookout for offers from Delta 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 $204. While the most popular route (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl) can be booked for $340 on average our data indicates $1,760 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

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$246Average$646FlexibilityNo cancel feeOn-time69%
DeltaCheapest$255Average$659FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$259Average$692FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$330Average$736FlexibilityNo cancel feeOn-time71%

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