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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 188

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
3 Aug — 10 Aug1
1 adult

Cheap flight deals from St. Louis to Pierre Elliott Trudeau Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Pierre Elliott Trudeau Intl (YUL). 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 July 2025.

Round-trip from

C$ 458

One-way from

C$ 188

Popular in

February

Cheapest in

October

Average price

C$ 488

Good round-trip deal

C$ 798 or less
American Airlines
  • American Airlines
  • 10/9-17/9
  • 2 total stops
  • 19h 45m total
  • St. Louis to Montreal
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American Airlines
  • American Airlines
  • 14/10
  • 1 total stop
  • 14h 36m total
  • St. Louis to Montreal
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Highest demand for flights based on searches. 24% potential increase in price (C$ 382 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease (C$ 52 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl.
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Find flight deals from St. Louis to Pierre Elliott Trudeau Intl

Cheapest flights from St. Louis to Pierre Elliott Trudeau Intl
Explore the most affordable flight options available from St. Louis to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 July 2025.

Wed 10/96:10 a.m.STL - YUL
1 stop9h 23mAmerican Airlines
Wed 17/912:31 p.m.YUL - STL
1 stop10h 22mAmerican Airlines
Deal found 27/7C$ 458
Sun 7/910:35 a.m.STL - YUL
2 stops12h 52mMultiple Airlines
Fri 14/119:25 a.m.YUL - STL
2 stops8h 10mMultiple Airlines
Deal found 27/7C$ 531
Sun 7/91:30 p.m.STL - YUL
Nonstop2h 30mAir Canada
Fri 14/1111:10 a.m.YUL - STL
1 stop5h 19mAir Canada
Deal found 27/7C$ 701
Tue 2/97:04 p.m.STL - YUL
2 stops20h 56mUnited Airlines
Sat 6/96:15 a.m.YUL - STL
1 stop10h 29mUnited Airlines
Deal found 28/7C$ 722
Wed 10/910:45 a.m.STL - YUL
2 stops10h 02mDelta
Wed 17/911:00 a.m.YUL - STL
1 stop10h 05mDelta
Deal found 29/7C$ 723

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Pierre Elliott Trudeau Intl 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 July 2025.
Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Pierre Elliott Trudeau Intl

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 10/9

6:10 a.m.-4:33 p.m.

1 stop9h 23m

Montreal Pierre Elliott Trudeau Intl

Wed 17/9

12:31 p.m.-9:53 p.m.

1 stop10h 22m

C$ 458

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 7/9

10:35 a.m.-12:27 a.m.

2 stops12h 52m

Montreal Pierre Elliott Trudeau Intl

Fri 14/11

9:25 a.m.-4:35 p.m.

2 stops8h 10m

C$ 531

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 7/9

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

Nonstop2h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 14/11

11:10 a.m.-3:29 p.m.

1 stop5h 19m

C$ 701

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/9

7:04 p.m.-5:00 p.m.

2 stops20h 56m

Montreal Pierre Elliott Trudeau Intl

Sat 6/9

6:15 a.m.-3:44 p.m.

1 stop10h 29m

C$ 722

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 10/9

10:45 a.m.-9:47 p.m.

2 stops10h 02m

Montreal Pierre Elliott Trudeau Intl

Wed 17/9

11:00 a.m.-8:05 p.m.

1 stop10h 05m

C$ 723

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 14/10

8:04 p.m.-11:40 a.m.

1 stop14h 36m

C$ 188

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 14/10

9:31 a.m.-6:40 p.m.

1 stop8h 09m

C$ 281

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 18/10

6:30 a.m.-8:29 p.m.

2 stops12h 59m

C$ 311

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 8/10

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

Nonstop2h 30m

C$ 313

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/8

5:40 p.m.-2:20 p.m.

1 stop19h 40m

C$ 329

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Best time to book a flight from St. Louis to Pierre Elliott Trudeau Intl

Have a flexible travel schedule? Discover the best time to fly to Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl Airport

What is the cheapest month to book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Currently, October is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 316). 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 YUL?

Find hourly flight availability from St. Louis to Pierre Elliott Trudeau Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 July 2025.

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

Weekly flight availability from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Explore weekly flight availability from St. Louis to Pierre Elliott Trudeau Intl. 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 29 July 2025.

The most flights from STL to YUL 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 St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Reviews of airlines servicing Pierre Elliott Trudeau Intl

Get insights into the airlines that provide service to Pierre Elliott Trudeau Intl. 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 Pierre Elliott Trudeau Intl. Reviews last updated 29 July 2025.
See what other customers who have flown with Delta,United Airlines, andAmerican Airlines from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,977 reviews
Check prices

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

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
7,977 reviews
Delta
8.0
Very good
7,977 reviews
Check prices

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

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
8,899 reviews
Delta
8.0
Very good
7,977 reviews
Check prices

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

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
7,977 reviews
Check prices

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

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
9,822 reviews
Delta
8.0
Very good
7,977 reviews
Check prices

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Entertainment

7.9

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 Pierre Elliott Trudeau Intl. 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 Pierre Elliott Trudeau Intl?

    For a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 20.4 km from the centre of the city. Lambert-St Louis is the only St. Louis airport and it handles 2 outbound flights to Montreal Pierre Elliott Trudeau Intl per day. 0 airlines have flights to Montreal Pierre Elliott Trudeau Intl from Lambert-St Louis on a regular basis.

  • What are the cheapest airlines flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport round-trip?

    Our cheapest airline available from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is American Airlines. Our recent data shows that you can find tickets from as low as C$ 458 on this airline. Additional options worth looking into are Air Canada and United Airlines, starting at C$ 701 and C$ 722 round-trip. American Airlines is currently priced 47% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport one-way?

    The cheapest airlines for a one-way flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport are American Airlines (C$ 188), Delta (C$ 281), and United Airlines (C$ 311).

  • What are the most reliable airlines from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

    Consider United Airlines (53%), Air Canada (51%) or Jazz (47%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport.

  • What are the cheapest flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

    While on average a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is generally C$ 798, our data shows the cheapest flight currently is C$ 364. When looking at the most popular route, (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl), you can expect to pay C$ 465 for that flight.

  • Can I find deals for flights from St. Louis to Pierre Elliott Trudeau Intl that include hotel bookings?

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

  • How can I find direct flights from St. Louis to Pierre Elliott Trudeau Intl?

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

  • Can I find deals for business class flights from St. Louis to Pierre Elliott Trudeau Intl?

    Yes. Cheapflights offers flight deals from St. Louis to Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl Airport?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 316). 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 Pierre Elliott Trudeau Intl Airport?

Book flights to Montreal Pierre Elliott Trudeau Intl Airport if you plan to visit one of these locations
Laval
Longueuil
Sherbrooke
Cornwall
Brossard
Dorval
Montebello
Drummondville
Trois-Rivières
Saint-Jean-sur-Richelieu
Boucherville
Saint-Sauveur
Bromont
North Hatley
Louiseville

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Pierre Elliott Trudeau Intl

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Pierre Elliott Trudeau Intl flights
Joplin to Pierre Elliott Trudeau Intl flights

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