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Cheap flights from Montreal to St. Louis from C$ 283

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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — STL
4 May — 11 May1
1 adult

Cheap 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 29 April 2025.

Round-trip from

C$ 568

One-way from

C$ 283

Popular in

December

Cheapest in

July

Average price

C$ 723

Good round-trip deal

C$ 633 or less

Good one-way deal

C$ 420 or less
12/6-19/6
  • 12/6-19/6
  • 6 total stops
  • 53h 18m total
  • Montreal to St. Louis
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2/6
  • 2/6
  • 3 total stops
  • 15h 54m total
  • Montreal to St. Louis
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Highest demand for flights based on searches. 3% potential increase in price (C$ 35 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 18 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 Montreal (YMQ) to Lambert-St Louis.
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Price to beat on a one-way flight from Montreal (YMQ) to Lambert-St Louis.
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Find flight deals from Montreal to St. Louis

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 29 April 2025.

Thu 12/67:00 a.m.YUL - STL
3 stops28h 33mMultiple Airlines
Thu 19/66:12 p.m.STL - YUL
3 stops24h 45mMultiple Airlines
Deal found 28/4C$ 568
Thu 12/612:45 p.m.YUL - STL
1 stop9h 49mDelta
Thu 19/62:15 p.m.STL - YUL
1 stop7h 58mDelta
Deal found 28/4C$ 661
Mon 21/77:00 a.m.YUL - STL
1 stop6h 34mWestJet
Thu 24/73:42 p.m.STL - YUL
1 stop7h 13mWestJet
Deal found 28/4C$ 773
Tue 8/73:30 p.m.YUL - STL
2 stops19h 29mUnited Airlines
Sat 12/75:30 p.m.STL - YUL
2 stops14h 08mUnited Airlines
Deal found 28/4C$ 791
Mon 21/76:10 p.m.YUL - STL
Nonstop2h 50mAir Canada
Thu 24/71:30 p.m.STL - YUL
Nonstop2h 30mAir Canada
Deal found 28/4C$ 897

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 29 April 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

Thu 12/6

7:00 a.m.-10:33 a.m.

3 stops28h 33m

Lambert-St Louis

Thu 19/6

6:12 p.m.-7:57 p.m.

3 stops24h 45m

C$ 568

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/6

12:45 p.m.-9:34 p.m.

1 stop9h 49m

Lambert-St Louis

Thu 19/6

2:15 p.m.-11:13 p.m.

1 stop7h 58m

C$ 661

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 21/7

7:00 a.m.-12:34 p.m.

1 stop6h 34m

Lambert-St Louis

Thu 24/7

3:42 p.m.-11:55 p.m.

1 stop7h 13m

C$ 773

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 8/7

3:30 p.m.-9:59 a.m.

2 stops19h 29m

Lambert-St Louis

Sat 12/7

5:30 p.m.-8:38 a.m.

2 stops14h 08m

C$ 791

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 21/7

6:10 p.m.-8:00 p.m.

Nonstop2h 50m

Lambert-St Louis

Thu 24/7

1:30 p.m.-5:00 p.m.

Nonstop2h 30m

C$ 897

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 2/6

8:55 a.m.-11:49 p.m.

3 stops15h 54m

C$ 283

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 4/7

6:00 a.m.-8:53 p.m.

1 stop15h 53m

C$ 330

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 2/6

6:10 p.m.-7:58 p.m.

Nonstop2h 48m

C$ 385

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 4/7

10:35 a.m.-6:32 p.m.

2 stops8h 57m

C$ 452

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 29/9

6:40 p.m.-3:38 p.m.

1 stop21h 58m

C$ 459

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/4

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, January is the cheapest month in which you can book a flight from Montreal to St. Louis (average of C$ 365). Flying from Montreal to St. Louis in September is currently the most expensive (average of C$ 491). 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 29 April 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 18% on flights from Montreal to St. Louis by exploring options for tickets in the afternoon.

Rainfall in St. Louis by month

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

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 mm per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, 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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

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 29 April 2025.
Delta
8.0
Very good
7,929 reviews
Check prices

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
WestJet
7.2
Good
2,823 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air Canada
7.0
Good
9,228 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

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

    Currently priced at C$ 661, Delta will fly you from Montreal to St. Louis and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from WestJet and United Airlines - these airlines can fly you to your destination from C$ 773 and C$ 791, respectively. You may be able to fly from Montreal to St. Louis for 9% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Montreal to St. Louis one-way?

    To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at C$ 330. Air Canada flights start at C$ 385 while deals on American Airlines start at C$ 452 one-way.

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

    Looking at all options, your cheapest flight can be booked for C$ 419. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 539 on average our data indicates C$ 638 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, January is the cheapest month in which you can book a flight from Montreal to St. Louis (average of C$ 365). Flying from Montreal to St. Louis in September is currently the most expensive (average of C$ 491). 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 Montreal?

Book flights to Montreal 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 29 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 543AverageC$ 733FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 617AverageC$ 750FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 762AverageC$ 1,023FlexibilityNo cancel feeOn-time60%
Search WestJet flights

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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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