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Cheap flights from Montreal to St. Louis from C$ 281

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 17/6. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — STL
3 Jun — 10 Jun1
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 4 May 2026.

Mon 1/66:30 p.m.
YUL
-
STL
Nonstop2h 55m
Air Canada
Sat 6/66:00 a.m.
STL
-
YUL
1 stop6h 09m
Air Canada
Deal found 30/4C$ 571
Fri 29/56:30 p.m.
YUL
-
STL
Nonstop2h 55m
Air Canada
Mon 1/62:15 p.m.
STL
-
YUL
1 stop5h 36m
Air Canada
Deal found 30/4C$ 582
Fri 29/57:00 a.m.
YUL
-
STL
1 stop10h 15m
Delta
Mon 1/67:05 a.m.
STL
-
YUL
1 stop9h 38m
Delta
Deal found 30/4C$ 590
Fri 29/56:35 p.m.
YUL
-
STL
2 stops18h 32m
United Airlines
Fri 5/67:05 p.m.
STL
-
YUL
1 stop14h 35m
United Airlines
Deal found 30/4C$ 591
Tue 2/66:30 p.m.
YUL
-
STL
Nonstop2h 55m
Air Canada
Wed 3/62:15 p.m.
STL
-
YUL
1 stop4h 36m
Air Canada
Deal found 29/4C$ 594
Fri 22/55:33 p.m.
YUL
-
STL
1 stop7h 21m
American Airlines
Fri 29/57:30 a.m.
STL
-
YUL
1 stop14h 29m
American Airlines
Deal found 3/5C$ 598
Thu 21/57:00 a.m.
YUL
-
STL
1 stop6h 06m
Air Canada
Mon 25/51:05 p.m.
STL
-
YUL
Nonstop2h 35m
Air Canada
Deal found 3/5C$ 599
Thu 15/104:55 p.m.
YUL
-
STL
Nonstop2h 46m
Air Canada
Mon 19/1012:10 p.m.
STL
-
YUL
Nonstop2h 31m
Air Canada
Deal found 30/4C$ 603

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 4 May 2026.

Round-trip from

C$ 571

One-way from

C$ 281

Popular in

May

Cheapest in

July

Average price

C$ 1,151

Good one-way deal

C$ 487 or less
Air Canada
  • Air Canada
  • 1/6-6/6
  • 1 total stop
  • 9h 04m total
  • Montreal to St. Louis
Search Deals
17/6
  • 17/6
  • 3 total stops
  • 35h 45m total
  • Montreal to St. Louis
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 181 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
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 4 May 2026.
Use the filters below to find and compare flights from Montreal to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

7:00 a.m.-4:15 p.m.

1 stop10h 15m

Lambert-St Louis

Mon 1/6

7:05 a.m.-5:43 p.m.

1 stop9h 38m

C$ 590

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 2/6

6:00 a.m.-9:29 a.m.

1 stop4h 29m

Lambert-St Louis

Wed 3/6

1:27 p.m.-11:57 p.m.

1 stop9h 30m

C$ 590

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

6:35 p.m.-12:07 p.m.

2 stops18h 32m

Lambert-St Louis

Fri 5/6

7:05 p.m.-10:40 a.m.

1 stop14h 35m

C$ 591

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 15/10

7:00 a.m.-2:40 p.m.

1 stop8h 40m

Lambert-St Louis

Mon 19/10

3:42 p.m.-11:51 p.m.

1 stop7h 09m

C$ 610

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 8/6

6:35 p.m.-12:11 p.m.

2 stops18h 36m

Lambert-St Louis

Mon 15/6

6:00 a.m.-10:06 p.m.

1 stop15h 06m

C$ 625
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 2/6

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

Lambert-St Louis

Wed 3/6

2:15 p.m.-7:51 p.m.

1 stop4h 36m

C$ 629

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 26/5

10:30 a.m.-8:52 p.m.

1 stop11h 22m

Lambert-St Louis

Fri 29/5

6:15 a.m.-3:28 p.m.

1 stop8h 13m

C$ 635
Cheapest one-way

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 17/6

6:45 a.m.-5:30 p.m.

3 stops35h 45m

C$ 281

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 24/6

5:07 p.m.-8:39 p.m.

1 stop4h 32m

C$ 336
Quickest one-way

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 25/5

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

C$ 337

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 19 resultsSorted by cheapest first
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, December is the cheapest month in which you can book a flight from Montreal to St. Louis (average of C$ 376). Flying from Montreal to St. Louis in January is currently the most expensive (average of C$ 852). 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 4 May 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Montreal to St. Louis as you normally would.

Weekly flight availability from Montreal to St. Louis

Explore weekly flight availability from Montreal to St. Louis. 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 4 May 2026.

The most flights from YMQ to STL 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 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 4 May 2026.
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
10,995 reviews
Check prices

Overall

7.1

Boarding

7.3

Crew

7.8

Entertainment

6.8

Comfort

7.1

Food

6.3

Reviews

1 / 20
6.0
Good

Paula,Mar 2026

YVR - PSP

Everything was OK, but we waited on the tarmac for an hour and 20 minutes after landing because there was no available gate. This is a daily occurrence at the Palm Springs airport, and happens with Air Canada and WestJet constantly.
Air Canada
7.1
Good
10,995 reviews
Air Canada
7.1
Good
10,995 reviews
Check prices

Overall

7.1

Boarding

7.3

Crew

7.8

Entertainment

6.8

Comfort

7.1

Food

6.3

Reviews

1 / 20
6.0
Good

Paula,Mar 2026

YVR - PSP

Everything was OK, but we waited on the tarmac for an hour and 20 minutes after landing because there was no available gate. This is a daily occurrence at the Palm Springs airport, and happens with Air Canada and WestJet constantly.

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 2 inbound flights from Montreal per day from 1 airline. 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 Delta and United Airlines fly from Montreal to St. Louis in about 10h 15m. The time it takes to get you to your destination can typically vary by up to 8h 17m. The distance from Montreal to St. Louis is about 1556 km. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Montreal to St. Louis round-trip?

    Currently priced at C$ 582, Air Canada will fly you from Montreal to St. Louis and back. In addition to Air Canada, many other airlines offer competitively priced options for your trip. You may be able to fly from Montreal to St. Louis for 30% less than the average price by searching for this airline.

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

    Looking at all options, your cheapest flight can be booked for C$ 487. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 591 on average, our data indicates C$ 487 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, December is the cheapest month in which you can book a flight from Montreal to St. Louis (average of C$ 376). Flying from Montreal to St. Louis in January is currently the most expensive (average of C$ 852). 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
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Top airline flying from Montreal to St. Louis

Discover the top airline 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 4 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 582AverageC$ 823FlexibilityNo cancel feeOn-time67%
Search Air Canada 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.

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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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