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

For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $137. Users have also found prices from $205 and $227 on Delta and United Airlines, respectively.

What is the cheapest day to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Travelers seeking maximum savings on their St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Montreal Pierre Elliott Trudeau Intl Airport ranges from 2.5 - 4.4 inches per month. August is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Montreal Pierre Elliott Trudeau Intl Airport when rainfall is around 2.5 in.

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 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 15.8 F).

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

Before booking your flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: United Airlines (53%), Air Canada (51%), Jazz( 47%).

What are the most popular airlines that fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

The most popular airlines flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport are American Airlines, Air Canada and Delta. Something to consider prior to booking your flight.

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

Our data shows that June tends to be the cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis. Users have commonly found prices around $588 for the month, but tickets can be as low as $267. Due to multiple factors, prepare for potentially higher prices in February.

What airport do you fly from for flights from St. Louis to Montreal Pierre Elliott Trudeau Intl?

Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl. On average, Lambert-St Louis has 2 outbound flights to Montreal Pierre Elliott Trudeau Intl per day from 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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.

$137+ Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Q: How much does it cost to fly round-trip from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Airfare is typical for this route at the moment. St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights typically cost between $267 and $607 in September. The cheapest round-trip price found within the last 3 days was $334 on American Airlines (Sep 10-Sep 17).

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from St. Louis to Pierre Elliott Trudeau Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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

Round-trip from	$334 (American Airlines)
One-way from	$137 (American Airlines)
Popular in	February
Cheapest in	October
Average price	$356
Good round-trip deal	$648 or less
Good one-way deal	$356 or less

From Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl

Search Deals

One-way flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl

Search Deals

Highest demand for flights based on searches. 24% potential increase in price ($203 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($28 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl.

Search Deals

Price to beat on a one-way flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl.

Search Deals

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 July 29, 2025.

Wed 9/106:10 amSTL - YUL

1 stop9h 23mAmerican Airlines

Wed 9/1712:31 pmYUL - STL

1 stop10h 22mAmerican Airlines

Deal found 7/27

$334

Sun 9/710:35 amSTL - YUL

2 stops12h 52mMultiple Airlines

Fri 11/149:25 amYUL - STL

2 stops8h 10mMultiple Airlines

Deal found 7/27

$387

Sun 9/71:30 pmSTL - YUL

Nonstop2h 30mAir Canada

Fri 11/1411:10 amYUL - STL

1 stop5h 19mAir Canada

Deal found 7/27

$511

Tue 10/143:23 pmSTL - YUL

1 stop19h 31mUnited Airlines

Sun 10/196:40 pmYUL - STL

1 stop17h 09mUnited Airlines

Deal found 7/29

$546

Wed 9/1010:45 amSTL - YUL

2 stops10h 02mDelta

Wed 9/1711:00 amYUL - STL

2 stops10h 34mDelta

Deal found 7/27

$562

Best flights from St. Louis to Pierre Elliott Trudeau Intl
Discover carefully curated flight deals from St. Louis to Pierre Elliott Trudeau Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Wed 9/106:10 amSTL - YUL

1 stop9h 23mAmerican Airlines

Wed 9/1712:31 pmYUL - STL

1 stop10h 22mAmerican Airlines

Deal found 7/27

$334

Sun 9/710:35 amSTL - YUL

2 stops12h 52mMultiple Airlines

Fri 11/149:25 amYUL - STL

2 stops8h 10mMultiple Airlines

Deal found 7/27

$387

Sun 9/71:30 pmSTL - YUL

Nonstop2h 30mAir Canada

Fri 11/1411:10 amYUL - STL

1 stop5h 19mAir Canada

Deal found 7/27

$511

Tue 9/27:04 pmSTL - YUL

2 stops20h 56mUnited Airlines

Sat 9/66:15 amYUL - STL

1 stop10h 29mUnited Airlines

Deal found 7/28

$526

Wed 9/1010:45 amSTL - YUL

2 stops10h 02mDelta

Wed 9/1711:00 amYUL - STL

2 stops10h 34mDelta

Deal found 7/27

$562

Last-minute flights from St. Louis to Pierre Elliott Trudeau Intl
Discover last-minute flight deals from St. Louis to Pierre Elliott Trudeau Intl. Data last updated July 29, 2025 and is based on user searches.

Wed 8/66:00 amSTL - YUL

1 stop14h 28mDelta

Wed 8/136:00 amYUL - STL

1 stop9h 43mDelta

Deal found 7/29

$653

Thu 8/1410:37 amSTL - YUL

2 stops12h 50mMultiple Airlines

Mon 8/186:00 amYUL - STL

1 stop8h 32mMultiple Airlines

Deal found 7/27

$506

Thu 8/215:30 pmSTL - YUL

1 stop19h 28mUnited Airlines

Mon 8/258:00 pmYUL - STL

2 stops20h 44mUnited Airlines

Deal found 7/28

$556

Mon 8/257:59 pmSTL - YUL

1 stop14h 37mAmerican Airlines

Mon 9/112:51 pmYUL - STL

1 stop8h 56mAmerican Airlines

Deal found 7/27

$517

Mon 8/259:15 amSTL - YUL

2 stops11h 31mAir Canada

Mon 9/19:15 amYUL - STL

1 stop7h 06mAir Canada

Deal found 7/27

$619

One-way flights from St. Louis to Pierre Elliott Trudeau Intl
Search for one-way flight options from St. Louis to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated July 29, 2025.

Tue 10/148:04 pmSTL - YUL

1 stop14h 36mAmerican Airlines

Deal found 7/27

$137

Tue 10/149:31 amSTL - YUL

1 stop8h 09mDelta

Deal found 7/29

$205

Sat 10/186:30 amSTL - YUL

2 stops12h 59mUnited Airlines

Deal found 7/28

$227

Mon 8/45:40 pmSTL - YUL

1 stop19h 40mMultiple Airlines

Deal found 7/27

$240

Tue 10/141:30 pmSTL - YUL

Nonstop2h 30mAir Canada

Deal found 7/29

$297

Cheapflights Fare Finder

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

Fly to

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/10

6:10 am-4:33 pm

1 stop9h 23m

Montreal Pierre Elliott Trudeau Intl

Wed 9/17

12:31 pm-9:53 pm

1 stop10h 22m

$334

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 9/7

10:35 am-12:27 am

2 stops12h 52m

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

9:25 am-4:35 pm

2 stops8h 10m

$387

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 9/7

1:30 pm-5:00 pm

Nonstop2h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

11:10 am-3:29 pm

1 stop5h 19m

$511

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 9/2

7:04 pm-5:00 pm

2 stops20h 56m

Montreal Pierre Elliott Trudeau Intl

Sat 9/6

6:15 am-3:44 pm

1 stop10h 29m

$526

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/10

10:45 am-9:47 pm

2 stops10h 02m

Montreal Pierre Elliott Trudeau Intl

Wed 9/17

11:00 am-8:34 pm

2 stops10h 34m

$562

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/14

8:04 pm-11:40 am

1 stop14h 36m

$137

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/14

9:31 am-6:40 pm

1 stop8h 09m

$205

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 10/18

6:30 am-8:29 pm

2 stops12h 59m

$227

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 8/4

5:40 pm-2:20 pm

1 stop19h 40m

$240

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/14

1:30 pm-5:00 pm

Nonstop2h 30m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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, January is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of $270). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in July is currently the most expensive (average of $409). 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?

It’s typically best to fly out from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in the evening. Doing so could potentially save you 76% on the flight price compared to flying at noon, which is usually more expensive.

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

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 a feel of what it's like to fly with Delta, United Airlines, and American Airlines from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,979 reviews

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

7,979 reviews

Delta

8.0

Very good

7,979 reviews

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

8,896 reviews

Delta

8.0

Very good

7,979 reviews

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

7,979 reviews

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

9,826 reviews

Delta

8.0

Very good

7,979 reviews

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

What airport do you fly from for flights from St. Louis to Montreal Pierre Elliott Trudeau Intl?
Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl. On average, Lambert-St Louis has 2 outbound flights to Montreal Pierre Elliott Trudeau Intl per day from 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.
What are the cheapest airlines flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport round-trip?
Currently priced at $334, American Airlines will fly you from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and United Airlines - these airlines can fly you to your destination from $511 and $526, respectively. American Airlines is 47% cheaper than the average price of flights available within the next 90 days to this destination.
What are the cheapest airlines to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport one-way?
For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $137. Users have also found prices from $205 and $227 on Delta and United Airlines, respectively.
What are the most reliable airlines from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?
Before booking your flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: United Airlines (53%), Air Canada (51%), Jazz( 47%).
What are the cheapest flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?
The cheapest flight price from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is $297. On average you can expect to pay $2,044. The most popular route, (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl), can usually be booked for $339.
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, January is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of $270). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in July is currently the most expensive (average of $409). 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

Longueuil

Laval

Brossard

Sherbrooke

Dorval

Browse thousands of different options on Cheapflights for your next trip

Top 4 airlines flying from St. Louis to Pierre Elliott Trudeau Intl

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$246	Average$689	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$255	Average$659	FlexibilityNo cancel fee	On-timeN/A
Air Canada	Cheapest$259	Average$688	FlexibilityNo cancel fee	On-time67%
American Airlines	Cheapest$330	Average$617	FlexibilityNo cancel fee	On-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$137+ Cheap flights from St. Louis (STL) to Pierre Elliott Trudeau Intl (YUL)

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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Pierre Elliott Trudeau Intl with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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

Cheapest flights from St. Louis to Pierre Elliott Trudeau IntlExplore 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 July 29, 2025.

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 July 29, 2025.

Cheapflights Fare Finder

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

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.

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?

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 July 29, 2025.

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

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

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?

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

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

What are the most reliable airlines 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?

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

How can I 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?

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

Traveling to a place near Montreal Pierre Elliott Trudeau Intl Airport?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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.

Top 4 airlines flying from St. Louis to Pierre Elliott Trudeau Intl

100% Free

Book with Flexibility

Travel Smart

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 July 29, 2025.