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.

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).

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 Air Canada (69%), Jazz (69%) or United Airlines (69%) as they are the most reliable in getting you off to your destination on time.

Most accurate provider : When it comes to deals on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 0 inbound flights 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.

$184+ 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

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 December 12, 2025.

Thu 12/257:08 amYUL - STL

1 stop13h 22mAmerican Airlines

Fri 1/25:30 amSTL - YUL

1 stop8h 54mAmerican Airlines

Deal found 12/11

$606

Sat 12/277:30 amYUL - STL

1 stop14h 21mAmerican Airlines

Wed 12/314:53 pmSTL - YUL

1 stop21h 17mAmerican Airlines

Deal found 12/11

$620

Fri 12/262:26 pmYUL - STL

1 stop6h 04mAmerican Airlines

Fri 1/25:30 amSTL - YUL

1 stop8h 54mAmerican Airlines

Deal found 12/11

$628

Sat 12/277:30 amYUL - STL

1 stop14h 21mAmerican Airlines

Fri 1/25:30 amSTL - YUL

1 stop8h 54mAmerican Airlines

Deal found 12/11

$630

Thu 12/259:15 amYUL - STL

2 stops13h 28mUnited Airlines

Fri 1/28:05 amSTL - YUL

1 stop6h 52mUnited Airlines

Deal found 12/11

$706

Fri 12/2611:10 amYUL - STL

1 stop5h 19mAir Canada

Fri 1/29:55 amSTL - YUL

2 stops10h 57mAir Canada

Deal found 12/11

$727

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 December 12, 2025.

Wed 1/213:50 pmYUL - STL

1 stop19h 30mAmerican Airlines

Wed 2/46:00 amSTL - YUL

1 stop8h 08mAmerican Airlines

Deal found 12/10

$373

Fri 1/307:30 pmYUL - STL

1 stop18h 06mDelta

Mon 2/25:56 pmSTL - YUL

1 stop4h 16mDelta

Deal found 12/9

$493

Wed 1/219:15 amYUL - STL

2 stops12h 58mUnited Airlines

Wed 2/410:10 amSTL - YUL

2 stops10h 32mUnited Airlines

Deal found 12/10

$547

Thu 2/123:55 pmYUL - STL

1 stop18h 39mAmerican Airlines

Wed 2/186:00 amSTL - YUL

1 stop8h 10mAmerican Airlines

Deal found 12/11

$465

Fri 1/167:30 pmYUL - STL

1 stop18h 06mDelta

Mon 1/196:35 amSTL - YUL

2 stops11h 02mDelta

Deal found 12/11

$499

Fri 1/162:13 pmYUL - STL

2 stops8h 00mUnited Airlines

Mon 1/199:57 amSTL - YUL

2 stops8h 51mUnited Airlines

Deal found 12/11

$556

Wed 1/2812:50 pmYUL - STL

1 stop8h 47mDelta

Sat 1/315:56 pmSTL - YUL

1 stop4h 16mDelta

Deal found 12/10

$515

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 December 12, 2025 and is based on user searches.

Fri 1/163:50 pmYUL - STL

1 stop19h 30mAmerican Airlines

Mon 1/196:00 amSTL - YUL

1 stop8h 08mAmerican Airlines

Deal found 12/11

$455

Fri 1/167:30 pmYUL - STL

1 stop18h 06mDelta

Mon 1/196:35 amSTL - YUL

2 stops11h 02mDelta

Deal found 12/11

$499

Fri 1/162:13 pmYUL - STL

2 stops8h 00mUnited Airlines

Mon 1/199:57 amSTL - YUL

2 stops8h 51mUnited Airlines

Deal found 12/11

$556

Wed 1/213:50 pmYUL - STL

1 stop19h 30mAmerican Airlines

Wed 2/46:00 amSTL - YUL

1 stop8h 08mAmerican Airlines

Deal found 12/10

$373

Wed 1/219:15 amYUL - STL

2 stops12h 58mUnited Airlines

Wed 2/410:10 amSTL - YUL

2 stops10h 32mUnited Airlines

Deal found 12/10

$547

Wed 1/2812:50 pmYUL - STL

1 stop8h 47mDelta

Sat 1/315:56 pmSTL - YUL

1 stop4h 16mDelta

Deal found 12/10

$515

Fri 1/307:30 pmYUL - STL

1 stop18h 06mDelta

Mon 2/25:56 pmSTL - YUL

1 stop4h 16mDelta

Deal found 12/9

$493

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 December 12, 2025.

Wed 1/76:45 amYUL - STL

3 stops33h 03mMultiple Airlines

Deal found 12/10

$184

Sun 1/254:35 pmYUL - STL

1 stop17h 46mMultiple Airlines

Deal found 12/11

$188

Fri 2/273:55 pmYUL - STL

1 stop18h 39mAmerican Airlines

Deal found 12/10

$198

Fri 2/2711:25 amYUL - STL

3 stops20h 26mMultiple Airlines

Deal found 12/10

$206

Thu 1/86:45 amYUL - STL

2 stops16h 48mMultiple Airlines

Deal found 12/11

$214

Fri 1/96:45 amYUL - STL

3 stops28h 17mMultiple Airlines

Deal found 12/10

$234

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

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$373 (American Airlines)
One-way from	$184 (Kiwi.com)
Popular in	August
Cheapest in	May
Average price	$761

Provider with most accurate pricing for Montreal Pierre Elliott Trudeau Intl-Lambert-St Louis flight deals.

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Provider most trusted by Cheapflights users for Montreal Pierre Elliott Trudeau Intl-Lambert-St Louis flights.

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From Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis

Search Deals

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

Search Deals

Highest demand for flights based on searches. 13% potential increase in price ($87 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($18 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

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

Wed 1/21

3:50 pm-10:20 am

1 stop19h 30m

Lambert-St Louis

Wed 2/4

6:00 am-3:08 pm

1 stop8h 08m

$373

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 2/12

3:55 pm-9:34 am

1 stop18h 39m

Lambert-St Louis

Wed 2/18

6:00 am-3:10 pm

1 stop8h 10m

$465

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 1/30

7:30 pm-12:36 pm

1 stop18h 06m

Lambert-St Louis

Mon 2/2

5:56 pm-11:12 pm

1 stop4h 16m

$493

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 1/16

7:30 pm-12:36 pm

1 stop18h 06m

Lambert-St Louis

Mon 1/19

6:35 am-6:37 pm

2 stops11h 02m

$499

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 1/28

12:50 pm-8:37 pm

1 stop8h 47m

Lambert-St Louis

Sat 1/31

5:56 pm-11:12 pm

1 stop4h 16m

$515

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 1/21

9:15 am-9:13 pm

2 stops12h 58m

Lambert-St Louis

Wed 2/4

10:10 am-9:42 pm

2 stops10h 32m

$547

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 1/16

2:13 pm-9:13 pm

2 stops8h 00m

Lambert-St Louis

Mon 1/19

9:57 am-7:48 pm

2 stops8h 51m

$556

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 1/7

6:45 am-2:48 pm

3 stops33h 03m

$184

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$188

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 2/27

3:55 pm-9:34 am

1 stop18h 39m

$198

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 13 results

Compare providers for flights from Pierre Elliott Trudeau Intl to St. Louis

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Pierre Elliott Trudeau Intl to St. Louis in December.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Montreal Pierre Elliott Trudeau Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, March is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of $392). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in August is currently the most expensive (average of $582). 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 52% on the flight price compared to flying at noon, which is usually more expensive.

The best insider tips for Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Montreal Pierre Elliott Trudeau Intl Airport to St. Louis trip

Airports

YUL

Use YULExpress to pre-book security fast track up to 72 hours before departure for a smoother experience.

STL

Take the MetroLink from STL for a convenient 40-minute ride to downtown St. Louis, avoiding traffic.

Our travel experts

John Walton

Expert on YUL

Taryn White

Expert on STL

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Delta and Air Canada from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Delta

7.9

Good

8,005 reviews

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Air Canada

7.1

Good

10,516 reviews

Delta

7.9

Good

8,005 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

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 0 inbound flights 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 long is the flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?
American Airlines and Delta can get you from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in just under 18h 06m. Your travel time can differ by up to 1h 24m. The distance from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis is about 967 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
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 Air Canada. Our recent data shows that you can find tickets from as low as $435 on this airline. An additional option worth looking into is Delta, starting at $452. Air Canada is priced at 24% lower than the current average price of a flight leaving 3 months from now.
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 Air Canada (69%), Jazz (69%) or United Airlines (69%) as they are the most reliable in getting you off to your destination on time.
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, March is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of $392). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in August is currently the most expensive (average of $582). 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

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Other flights to St. Louis

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

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$435	Average$561	FlexibilityNo cancel fee	On-time67%
Delta	Cheapest$452	Average$511	FlexibilityNo cancel fee	On-timeN/A

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$184+ 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 1/7. 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

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 December 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 December 12, 2025.

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

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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.

Compare providers for flights from Pierre Elliott Trudeau Intl to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Pierre Elliott Trudeau Intl to St. Louis in December.

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?

The best insider tips for Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flights

AI-powered summary based on content written by travel experts. AI can make mistakes.

Cheapflights partnered with top experts to bring you the best recommendations for your Montreal Pierre Elliott Trudeau Intl Airport to St. Louis trip

Airports

YUL

STL

Our travel experts

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Delta and Air Canada from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

How long is the flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

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

What are the most reliable airlines 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 St. Louis?

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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 December 12, 2025.