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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 193

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
17 Jun — 24 Jun1
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 12 June 2025.

Round-trip from

C$ 465

One-way from

C$ 193

Popular in

March

Cheapest in

August

Average price

C$ 946

Good round-trip deal

C$ 795 or less
American Airlines
  • American Airlines
  • 18/9-23/9
  • 2 total stops
  • 25h 18m total
  • St. Louis to Montreal
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American Airlines
  • American Airlines
  • 18/9
  • 1 total stop
  • 8h 07m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (C$ 301 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 45 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 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 12 June 2025.

Thu 18/97:23 a.m.STL - YUL
1 stop8h 07mAmerican Airlines
Tue 23/95:15 p.m.YUL - STL
1 stop17h 11mAmerican Airlines
Deal found 11/6C$ 465
Mon 14/710:47 a.m.STL - YUL
2 stops30h 08mMultiple Airlines
Mon 21/78:55 a.m.YUL - STL
3 stops32h 36mMultiple Airlines
Deal found 10/6C$ 550
Mon 11/86:45 p.m.STL - YUL
1 stop14h 22mDelta
Tue 19/86:00 a.m.YUL - STL
1 stop15h 57mDelta
Deal found 12/6C$ 604
Mon 11/85:30 p.m.STL - YUL
1 stop17h 28mUnited Airlines
Tue 12/83:30 p.m.YUL - STL
2 stops19h 29mUnited Airlines
Deal found 12/6C$ 749
Tue 24/61:30 p.m.STL - YUL
Nonstop2h 30mAir Canada
Wed 25/67:00 a.m.YUL - STL
1 stop6h 36mAir Canada
Deal found 10/6C$ 800

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 12 June 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

Thu 18/9

7:23 a.m.-4:30 p.m.

1 stop8h 07m

Montreal Pierre Elliott Trudeau Intl

Tue 23/9

5:15 p.m.-9:26 a.m.

1 stop17h 11m

C$ 465

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 14/7

10:47 a.m.-5:55 p.m.

2 stops30h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 21/7

8:55 a.m.-4:31 p.m.

3 stops32h 36m

C$ 550

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 11/8

6:45 p.m.-10:07 a.m.

1 stop14h 22m

Montreal Pierre Elliott Trudeau Intl

Mon 18/8

5:05 p.m.-8:06 a.m.

1 stop16h 01m

C$ 604

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 11/8

5:30 p.m.-11:58 a.m.

1 stop17h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 12/8

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

2 stops19h 29m

C$ 749

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 24/6

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

Nonstop2h 30m

Montreal Pierre Elliott Trudeau Intl

Wed 25/6

7:00 a.m.-12:36 p.m.

1 stop6h 36m

C$ 800

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 18/9

7:23 a.m.-4:30 p.m.

1 stop8h 07m

C$ 193

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 18/9

8:44 a.m.-5:55 p.m.

2 stops32h 11m

C$ 206

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 14/10

12:00 p.m.-9:26 p.m.

1 stop8h 26m

C$ 246

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 29/6

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

Nonstop2h 30m

C$ 355

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 28/6

6:33 a.m.-3:00 p.m.

2 stops7h 27m

C$ 357

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 11 results
1
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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 12 June 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 14% on flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport by exploring options for tickets at noon.

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 12 June 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).

Rainfall in Pierre Elliott Trudeau Intl by month

Plan your trip to Pierre Elliott Trudeau Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Montreal Pierre Elliott Trudeau Intl Airport ranges from 64.0 - 111.0 mm per month. August is typically the wettest month, when rainfall can reach 111.0 mm. February is typically the driest time to visit Montreal Pierre Elliott Trudeau Intl Airport when rainfall is around 64.0 mm.

Temperature in Pierre Elliott Trudeau Intl by month

Plan your trip to Pierre Elliott Trudeau Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Montreal Pierre Elliott Trudeau Intl Airport, 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 22.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -9.0 C).

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 12 June 2025.
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

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
7,950 reviews
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

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
7,950 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

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
7,950 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

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
7,950 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

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
9,531 reviews
Delta
8.0
Very good
7,950 reviews
Check prices

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

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$ 465 on this airline. Additional options worth looking into are Delta and United Airlines, starting at C$ 604 and C$ 749 round-trip. American Airlines is currently priced 46% 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$ 193), Delta (C$ 246), and Air Canada (C$ 355).

  • 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$ 795, our data shows the cheapest flight currently is C$ 363. When looking at the most popular route, (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl), you can expect to pay C$ 550 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Laval
Longueuil
Cornwall
Dorval
Brossard
Montebello
Drummondville
Trois-Rivières
Sherbrooke
Saint-Jean-sur-Richelieu
Boucherville
Saint-Sauveur
Bromont

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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.
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