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Cheap flights from Montreal to St. Louis from C$ 196

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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — STL
20 Jan — 27 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Montreal to St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from Montreal to St. Louis
Explore the most affordable flight options available from Montreal to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 December 2025.

Fri 26/1212:50 p.m.YUL - STL
1 stop5h 11mDelta
Fri 2/16:29 a.m.STL - YUL
1 stop4h 30mDelta
Deal found 18/12C$ 920
Sat 27/127:30 a.m.YUL - STL
1 stop14h 21mAmerican Airlines
Sat 3/15:22 a.m.STL - YUL
1 stop16h 36mAmerican Airlines
Deal found 20/12C$ 951
Sat 27/123:50 p.m.YUL - STL
1 stop17h 45mAmerican Airlines
Fri 2/18:01 p.m.STL - YUL
1 stop18h 09mAmerican Airlines
Deal found 20/12C$ 1,020
Fri 26/123:59 p.m.YUL - STL
1 stop5h 52mAmerican Airlines
Fri 2/17:05 a.m.STL - YUL
1 stop14h 34mAmerican Airlines
Deal found 20/12C$ 1,079
Fri 26/126:45 a.m.YUL - STL
2 stops11h 16mWestJet
Fri 2/17:10 a.m.STL - YUL
1 stop9h 50mWestJet
Deal found 19/12C$ 1,131
Sat 27/129:15 a.m.YUL - STL
2 stops8h 12mUnited Airlines
Sat 3/16:30 a.m.STL - YUL
2 stops7h 46mUnited Airlines
Deal found 20/12C$ 1,296
Sat 27/127:00 a.m.YUL - STL
2 stops8h 26mUnited Airlines
Fri 2/18:15 a.m.STL - YUL
1 stop6h 01mUnited Airlines
Deal found 20/12C$ 1,304
Fri 19/124:45 p.m.YUL - STL
1 stop5h 58mAir Canada
Sat 3/16:30 a.m.STL - YUL
1 stop13h 47mAir Canada
Deal found 19/12C$ 1,555

Find flight deals from Montreal to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Montreal (YMQ) to St. Louis (STL). 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 21 December 2025.

Round-trip from

C$ 454

One-way from

C$ 196

Popular in

June

Cheapest in

July

Average price

C$ 1,065

Good one-way deal

C$ 495 or less
American Airlines
  • American Airlines
  • 2/2-9/2
  • 2 total stops
  • 27h 38m total
  • Montreal to St. Louis
Search Deals
3/2
  • 3/2
  • 3 total stops
  • 13h 48m total
  • Montreal to St. Louis
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 41 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a one-way flight from Montreal (YMQ) to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Montreal to St. Louis 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 629,999 searches. Data last updated 21 December 2025.
Use the filters below to find and compare flights from Montreal to St. Louis that are best for you.

Fly from

Montreal

Fly to

St. Louis

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 2/2

3:50 p.m.-10:20 a.m.

1 stop19h 30m

Lambert-St Louis

Mon 9/2

6:00 a.m.-3:08 p.m.

1 stop8h 08m

C$ 454

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 4/2

7:00 a.m.-11:12 p.m.

1 stop17h 12m

Lambert-St Louis

Wed 11/2

6:00 a.m.-3:08 p.m.

1 stop8h 08m

C$ 664

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 28/1

1:02 p.m.-4:37 p.m.

1 stop4h 35m

Lambert-St Louis

Sat 31/1

6:35 a.m.-12:12 p.m.

1 stop4h 37m

C$ 723

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 22/1

7:00 a.m.-2:49 p.m.

1 stop8h 49m

Lambert-St Louis

Mon 26/1

6:35 a.m.-12:12 p.m.

1 stop4h 37m

C$ 723

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/2

9:15 a.m.-9:05 p.m.

2 stops12h 50m

Lambert-St Louis

Tue 17/2

11:25 a.m.-9:17 p.m.

1 stop8h 52m

C$ 748

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 3/2

10:45 a.m.-11:33 p.m.

3 stops13h 48m

C$ 196

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 2/2

8:00 a.m.-11:33 p.m.

2 stops40h 33m

C$ 235

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 20/1

6:45 a.m.-6:51 a.m.

3 stops25h 06m

C$ 239

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 2/2

7:30 p.m.-8:34 a.m.

1 stop14h 04m

C$ 367

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 3/2

7:30 p.m.-8:34 a.m.

1 stop14h 04m

C$ 389

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/12

Showing 1-10 of 14 results
1
2

Best time to book a flight from Montreal to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Montreal 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 Montreal to St. Louis

What is the cheapest month to book a flight from Montreal to St. Louis?

Currently, March is the cheapest month in which you can book a flight from Montreal to St. Louis (average of C$ 541). Flying from Montreal to St. Louis in December is currently the most expensive (average of C$ 806). 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 YMQ to STL?

Find hourly flight availability from Montreal to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 December 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 26% on flights from Montreal to St. Louis by exploring options for tickets in the morning.

How much does it cost to fly round-trip from Montreal to St. Louis?

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated 21 December 2025.
Read reviews from past customers who have flown Air Canada from Montreal to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,551 reviews
Check prices

Entertainment

6.8

Comfort

7.1

Overall

7.1

Boarding

7.3

Food

6.3

Crew

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

YYZ - LAS

It's was great and the crew are very nice, captain has a smooth land on the runway 👍
Air Canada
7.1
Good
10,551 reviews
Air Canada
7.1
Good
10,551 reviews
Check prices

Entertainment

6.8

Comfort

7.1

Overall

7.1

Boarding

7.3

Food

6.3

Crew

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

YYZ - LAS

It's was great and the crew are very nice, captain has a smooth land on the runway 👍

Related info for your journey

Find useful and relevant information for your journey from Montreal to St. Louis. 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 into for flights to St. Louis from Montreal?

    Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Montreal. On average, Lambert-St Louis has 0 inbound flights from Montreal per day from 3 airlines. Lambert-St Louis is conveniently located just 20.4 km from St. Louis’s city centre.

  • How long is the flight from Montreal to St. Louis?

    Airlines like American Airlines and Delta fly from Montreal to St. Louis in about 4h 35m. The time it takes to get you to your destination can typically vary by up to 14h 55m. The distance from Montreal to St. Louis is about 1556 km. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Montreal to St. Louis round-trip?

    Currently priced at C$ 454, United Airlines will fly you from Montreal to St. Louis and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and WestJet - these airlines can fly you to your destination from C$ 541 and C$ 739, respectively. You may be able to fly from Montreal to St. Louis for 43% less than the average price by searching for these airlines.

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

    Looking at all options, your cheapest flight can be booked for C$ 495. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 723 on average, our data indicates C$ 495 when flying from Montreal to St. Louis.

  • Can I find deals for flights from Montreal to St. Louis that include hotel bookings?

    Yes. In addition to deals on Montreal to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Montreal to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Montreal to St. Louis.

  • Can I find deals for business class flights from Montreal to St. Louis?

    Yes. Cheapflights offers flight deals from Montreal to St. Louis 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 Montreal to St. Louis?

    Currently, March is the cheapest month in which you can book a flight from Montreal to St. Louis (average of C$ 541). Flying from Montreal to St. Louis in December is currently the most expensive (average of C$ 806). 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

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Chesterfield
St. Peters

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Top 3 airlines flying from Montreal to St. Louis

Discover the top 3 airlines that operate flights from Montreal to St. Louis. 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 629,999 searches. Data last updated 21 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 540AverageC$ 731FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 592AverageC$ 630FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 739AverageC$ 1,019FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Montreal to St. Louis?

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Can Cheapflights find flights from Montreal to St. Louis with no change fees?

Certainly. Search results for flights to St. Louis from Montreal shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Montreal to St. Louis become cheaper?

Not ready to book yet? You can track prices for flights from Montreal to St. Louis on Cheapflights with our Price Alert feature and get notified when better prices are available.

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