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

$220 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and Air Canada, with prices starting from $256 and $305, respectively.

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

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

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

No one likes to see their flight delayed. When booking a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis consider choosing Jazz (100%), Air Canada (79%) or United Airlines (59%) as they are the most reliable in getting you off to your destination on time.

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

Departing on a Thursday is a good option for securing a great price. You can expect to save up to 128% when planning your travel around this day of the week.

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

The best pricing can be found in the month of July. Prices to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport average $535. You can even find prices in July for less than $535, as users have found deals to St. Louis from as low as $340. The month of May appears to be one of the more expensive times to travel to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport. Flying in the targeted month can save you up to 32%.

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

For a flight from Montreal Pierre Elliott Trudeau Intl to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 1 inbound flight from Montreal Pierre Elliott Trudeau Intl per day. 2 airlines have flights to Lambert-St Louis from Montreal Pierre Elliott Trudeau Intl on a regular basis.

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

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

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

Yes. Cheapflights offers flight deals from Pierre Elliott Trudeau Intl 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.

$212+ Flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

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

Round-trip from	$333 (American Airlines)
One-way from	$212 (Kiwi.com)
Popular in	December
Cheapest in	May
Average price	$552
Good round-trip deal	$326 or less
Good one-way deal	$325 or less

From Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis

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

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Highest demand for flights based on searches. 4% potential increase in price ($23 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($16 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 Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis.

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

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

Cheapest flights from Pierre Elliott Trudeau Intl to St. Louis
Explore the most affordable flight options available from Pierre Elliott Trudeau Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Thu 9/2512:30 pmYUL - STL

1 stop8h 55mAmerican Airlines

Mon 9/295:55 amSTL - YUL

1 stop9h 35mAmerican Airlines

Deal found 6/11

$333

Thu 7/101:10 pmYUL - STL

2 stops21h 42mMultiple Airlines

Thu 7/1710:47 amSTL - YUL

3 stops26h 03mMultiple Airlines

Deal found 6/12

$393

Thu 8/286:00 amYUL - STL

2 stops11h 06mDelta

Tue 9/212:00 pmSTL - YUL

1 stop8h 48mDelta

Deal found 6/11

$458

Mon 6/238:00 amYUL - STL

1 stop5h 36mAir Canada

Sun 6/291:30 pmSTL - YUL

Nonstop2h 30mAir Canada

Deal found 6/10

$470

Thu 6/194:30 pmYUL - STL

1 stop5h 45mUnited Airlines

Thu 6/268:00 amSTL - YUL

1 stop8h 26mUnited Airlines

Deal found 6/12

$536

Thu 9/256:45 amYUL - STL

2 stops28h 55mWestJet

Mon 9/291:30 pmSTL - YUL

2 stops10h 07mWestJet

Deal found 6/10

$630

Best flights from Pierre Elliott Trudeau Intl to St. Louis
Discover carefully curated flight deals from Pierre Elliott Trudeau Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2025.

Thu 9/2512:30 pmYUL - STL

1 stop8h 55mAmerican Airlines

Mon 9/295:55 amSTL - YUL

1 stop9h 35mAmerican Airlines

Deal found 6/11

$333

Thu 7/101:10 pmYUL - STL

2 stops21h 42mMultiple Airlines

Thu 7/1710:47 amSTL - YUL

3 stops26h 03mMultiple Airlines

Deal found 6/12

$393

Thu 8/286:00 amYUL - STL

2 stops11h 06mDelta

Tue 9/212:00 pmSTL - YUL

1 stop8h 48mDelta

Deal found 6/11

$458

Mon 6/238:00 amYUL - STL

1 stop5h 36mAir Canada

Sun 6/291:30 pmSTL - YUL

Nonstop2h 30mAir Canada

Deal found 6/10

$470

Wed 8/66:10 pmYUL - STL

Nonstop2h 50mUnited Airlines

Mon 8/188:00 amSTL - YUL

1 stop8h 26mUnited Airlines

Deal found 6/11

$544

Thu 9/256:45 amYUL - STL

2 stops28h 55mWestJet

Mon 9/291:30 pmSTL - YUL

2 stops10h 07mWestJet

Deal found 6/10

$630

Last-minute flights from Pierre Elliott Trudeau Intl to St. Louis
Discover last-minute flight deals from Pierre Elliott Trudeau Intl to St. Louis. Data last updated June 12, 2025 and is based on user searches.

Thu 6/194:30 pmYUL - STL

1 stop5h 45mUnited Airlines

Thu 6/268:00 amSTL - YUL

1 stop8h 26mUnited Airlines

Deal found 6/12

$536

Thu 6/196:45 amYUL - STL

2 stops35h 19mMultiple Airlines

Thu 6/269:50 amSTL - YUL

3 stops13h 47mMultiple Airlines

Deal found 6/12

$554

Mon 6/236:45 pmYUL - STL

1 stop6h 06mDelta

Tue 7/156:00 amSTL - YUL

1 stop9h 07mDelta

Deal found 6/10

$463

Mon 6/238:00 amYUL - STL

1 stop5h 36mAir Canada

Sun 6/291:30 pmSTL - YUL

Nonstop2h 30mAir Canada

Deal found 6/10

$470

Mon 6/236:45 amYUL - STL

2 stops18h 06mWestJet

Tue 7/155:23 pmSTL - YUL

2 stops36h 45mWestJet

Deal found 6/10

$642

Thu 7/101:10 pmYUL - STL

2 stops21h 42mMultiple Airlines

Thu 7/1710:47 amSTL - YUL

3 stops26h 03mMultiple Airlines

Deal found 6/12

$393

Thu 7/1010:30 amYUL - STL

2 stops14h 21mAmerican Airlines

Wed 8/277:23 amSTL - YUL

1 stop8h 18mAmerican Airlines

Deal found 6/12

$484

One-way flights from Pierre Elliott Trudeau Intl to St. Louis
Search for one-way flight options from Pierre Elliott Trudeau Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 12, 2025.

Tue 7/296:45 amYUL - STL

2 stops28h 44mMultiple Airlines

Deal found 6/10

$212

Fri 9/195:15 pmYUL - STL

1 stop17h 11mAmerican Airlines

Deal found 6/12

$220

Fri 7/46:00 amYUL - STL

1 stop10h 17mDelta

Deal found 6/10

$256

Sun 9/146:10 pmYUL - STL

Nonstop2h 47mAir Canada

Deal found 6/12

$305

Sun 9/146:00 amYUL - STL

2 stops9h 19mUnited Airlines

Deal found 6/10

$330

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/25

12:30 pm-8:25 pm

1 stop8h 55m

Lambert-St Louis

Mon 9/29

5:55 am-4:30 pm

1 stop9h 35m

$333

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 7/10

1:10 pm-9:52 am

2 stops21h 42m

Lambert-St Louis

Thu 7/17

10:47 am-1:50 pm

3 stops26h 03m

$393

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 8/28

6:00 am-4:06 pm

2 stops11h 06m

Lambert-St Louis

Tue 9/2

12:00 pm-9:48 pm

1 stop8h 48m

$458

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 6/23

8:00 am-12:36 pm

1 stop5h 36m

Lambert-St Louis

Sun 6/29

1:30 pm-5:00 pm

Nonstop2h 30m

$470

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 8/6

6:10 pm-8:00 pm

Nonstop2h 50m

Lambert-St Louis

Mon 8/18

8:00 am-5:26 pm

1 stop8h 26m

$544

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/25

6:45 am-10:40 am

2 stops28h 55m

Lambert-St Louis

Mon 9/29

1:30 pm-12:37 am

2 stops10h 07m

$630

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 7/29

6:45 am-10:29 am

2 stops28h 44m

$212

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 9/19

5:15 pm-9:26 am

1 stop17h 11m

$220

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 7/4

6:00 am-3:17 pm

1 stop10h 17m

$256

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 9/14

6:10 pm-7:57 pm

Nonstop2h 47m

$305

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 11 results

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

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

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

Currently, August is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of $311). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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 YUL to STL?

It’s typically best to fly out from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in the evening. Doing so could potentially save you 53% on the flight price compared to flying at noon, which is usually more expensive.

Rainfall in St. Louis by month

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Delta

8.0

Very good

7,950 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

7,950 reviews

Delta

8.0

Very good

7,950 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

8,790 reviews

Delta

8.0

Very good

7,950 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

7,950 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!

WestJet

7.2

Good

2,868 reviews

Delta

8.0

Very good

7,950 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

9,531 reviews

Delta

8.0

Very good

7,950 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 into for flights to St. Louis from Montreal Pierre Elliott Trudeau Intl?
For a flight from Montreal Pierre Elliott Trudeau Intl to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 1 inbound flight from Montreal Pierre Elliott Trudeau Intl per day. 2 airlines have flights to Lambert-St Louis from Montreal Pierre Elliott Trudeau Intl on a regular basis.
What are the cheapest airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis round-trip?
Our cheapest airline available from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis is American Airlines. Our recent data shows that you can find tickets from as low as $333 on this airline. Additional options worth looking into are Delta and Air Canada, starting at $458 and $470 round-trip. American Airlines is priced at 41% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis one-way?
$220 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and Air Canada, with prices starting from $256 and $305, respectively.
What are the most reliable airlines from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?
No one likes to see their flight delayed. When booking a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis consider choosing Jazz (100%), Air Canada (79%) or United Airlines (59%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?
While on average a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis is generally $326, our data shows the cheapest flight currently is $323. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis), you can expect to pay $409 for that flight.
Can I find deals for flights from Pierre Elliott Trudeau Intl to St. Louis that include hotel bookings?
Yes. In addition to deals on Pierre Elliott Trudeau Intl to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Pierre Elliott Trudeau Intl to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Pierre Elliott Trudeau Intl to St. Louis.
Can I find deals for business class flights from Pierre Elliott Trudeau Intl to St. Louis?
Yes. Cheapflights offers flight deals from Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl Airport to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of $311). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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

O'Fallon

Maryland Heights

Fairview Heights

Collinsville

Eureka

St. Peters

Glencoe

Festus

Alton

Farmington

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Top 2 airlines flying from Pierre Elliott Trudeau Intl to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$433	Average$542	FlexibilityNo cancel fee	On-time67%
Delta	Cheapest$452	Average$511	FlexibilityNo cancel fee	On-timeN/A

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$212+ Cheap flights from Pierre Elliott Trudeau Intl (YUL) to St. Louis (STL)

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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.

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

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

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

Cheapest flights from Pierre Elliott Trudeau Intl to St. LouisExplore the most affordable flight options available from Pierre Elliott Trudeau Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Explore the most affordable flight options available from Pierre Elliott Trudeau Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

Cheapflights Fare Finder

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

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

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Pierre Elliott Trudeau Intl with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

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

What is the cheapest time of day to fly from YUL to STL?

Find hourly flight availability from Pierre Elliott Trudeau Intl 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 June 12, 2025.

Rainfall in St. Louis by month

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

Temperature in St. Louis by month

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

Reviews of airlines servicing St. Louis

Related info for your journey

Find useful and relevant information for your journey from Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl?

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

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

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

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

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Pierre Elliott Trudeau Intl to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Pierre Elliott Trudeau Intl to St. Louis

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Cheapest flights from Pierre Elliott Trudeau Intl to St. Louis
Explore the most affordable flight options available from Pierre Elliott Trudeau Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.