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 Sun Country Air (100%), Air Canada (73%) or Jazz (73%) 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.

$218+ Cheap 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

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$389 (Kiwi.com)
One-way from	$218 (Kiwi.com)
Popular in	August
Cheapest in	May
Average price	$695

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

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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. 11% potential increase in price ($77 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).

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Average for round-trip flights in October 2025

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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 October 28, 2025.

Wed 12/106:45 amYUL - STL

2 stops32h 07mMultiple Airlines

Wed 12/173:30 pmSTL - YUL

1 stop8h 00mMultiple Airlines

Deal found 10/26

$389

Thu 12/115:10 pmYUL - STL

2 stops17h 37mMultiple Airlines

Thu 12/1811:51 amSTL - YUL

1 stop11h 54mMultiple Airlines

Deal found 10/27

$452

Sun 11/238:00 amYUL - STL

2 stops35h 19mMultiple Airlines

Sun 11/3010:24 amSTL - YUL

1 stop13h 06mMultiple Airlines

Deal found 10/26

$489

Wed 12/109:35 amYUL - STL

1 stop7h 17mDelta

Wed 12/179:50 amSTL - YUL

1 stop8h 04mDelta

Deal found 10/26

$517

Fri 12/54:45 pmYUL - STL

1 stop5h 02mDelta

Fri 1/26:05 amSTL - YUL

1 stop6h 44mDelta

Deal found 10/27

$532

Fri 12/57:00 pmYUL - STL

2 stops17h 01mUnited Airlines

Fri 1/26:30 amSTL - YUL

1 stop8h 27mUnited Airlines

Deal found 10/27

$549

Fri 11/1412:45 pmYUL - STL

1 stop9h 19mDelta

Sun 11/167:05 amSTL - YUL

1 stop9h 16mDelta

Deal found 10/25

$576

Mon 11/102:29 pmYUL - STL

1 stop9h 38mAmerican Airlines

Mon 11/1710:15 amSTL - YUL

1 stop11h 24mAmerican Airlines

Deal found 10/27

$586

Wed 11/267:00 amYUL - STL

1 stop10h 07mDelta

Sun 11/307:05 amSTL - YUL

1 stop9h 16mDelta

Deal found 10/26

$592

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 October 28, 2025.

Sat 1/176:00 amYUL - STL

1 stop9h 28mUnited Airlines

Sat 1/2411:20 amSTL - YUL

1 stop8h 57mUnited Airlines

Deal found 10/26

$390

Thu 2/193:45 pmYUL - STL

1 stop18h 42mAmerican Airlines

Mon 2/236:04 amSTL - YUL

1 stop7h 56mAmerican Airlines

Deal found 10/25

$426

Wed 12/109:35 amYUL - STL

1 stop7h 17mDelta

Wed 12/179:50 amSTL - YUL

1 stop8h 04mDelta

Deal found 10/26

$517

Fri 12/54:45 pmYUL - STL

1 stop5h 02mDelta

Fri 1/26:05 amSTL - YUL

1 stop6h 44mDelta

Deal found 10/27

$532

Thu 2/192:13 pmYUL - STL

2 stops8h 47mUnited Airlines

Mon 2/236:30 amSTL - YUL

2 stops7h 46mUnited Airlines

Deal found 10/25

$541

Thu 12/116:30 pmYUL - STL

1 stop6h 12mDelta

Thu 12/187:05 amSTL - YUL

1 stop9h 20mDelta

Deal found 10/27

$532

Fri 12/57:00 pmYUL - STL

2 stops17h 01mUnited Airlines

Fri 1/26:30 amSTL - YUL

1 stop8h 27mUnited Airlines

Deal found 10/27

$549

Tue 4/77:00 amYUL - STL

1 stop9h 01mDelta

Wed 4/84:00 pmSTL - YUL

1 stop6h 54mDelta

Deal found 10/25

$553

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 October 28, 2025 and is based on user searches.

Sun 11/24:35 pmYUL - STL

1 stop18h 05mMultiple Airlines

Sat 11/157:45 pmSTL - YUL

2 stops27h 45mMultiple Airlines

Deal found 10/28

$615

Tue 11/47:30 pmYUL - STL

2 stops15h 07mDelta

Tue 11/115:17 pmSTL - YUL

1 stop5h 42mDelta

Deal found 10/28

$637

Wed 11/57:30 pmYUL - STL

1 stop13h 43mDelta

Mon 11/105:34 pmSTL - YUL

1 stop5h 08mDelta

Deal found 10/27

$664

Sat 11/89:28 amYUL - STL

2 stops10h 15mDelta

Thu 11/139:33 amSTL - YUL

1 stop6h 48mDelta

Deal found 10/27

$640

Mon 11/102:29 pmYUL - STL

1 stop9h 38mAmerican Airlines

Mon 11/1710:15 amSTL - YUL

1 stop11h 24mAmerican Airlines

Deal found 10/27

$586

Fri 11/1412:45 pmYUL - STL

1 stop9h 19mDelta

Sun 11/167:05 amSTL - YUL

1 stop9h 16mDelta

Deal found 10/25

$576

Sun 11/238:00 amYUL - STL

2 stops35h 19mMultiple Airlines

Sun 11/3010:24 amSTL - YUL

1 stop13h 06mMultiple Airlines

Deal found 10/26

$489

Wed 11/267:00 amYUL - STL

1 stop10h 07mDelta

Sun 11/307:05 amSTL - YUL

1 stop9h 16mDelta

Deal found 10/26

$592

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 October 28, 2025.

Thu 12/115:25 pmYUL - STL

3 stops17h 22mMultiple Airlines

Deal found 10/26

$218

Thu 12/117:30 amYUL - STL

1 stop13h 51mAmerican Airlines

Deal found 10/26

$289

Sat 12/2711:25 amYUL - STL

3 stops23h 15mMultiple Airlines

Deal found 10/26

$331

Thu 11/66:00 amYUL - STL

1 stop5h 51mUnited Airlines

Deal found 10/26

$488

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

Sat 1/17

6:00 am-2:28 pm

1 stop9h 28m

Lambert-St Louis

Sat 1/24

11:20 am-9:17 pm

1 stop8h 57m

$390

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 2/19

3:45 pm-9:27 am

1 stop18h 42m

Lambert-St Louis

Mon 2/23

6:04 am-3:00 pm

1 stop7h 56m

$426

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 12/10

9:35 am-3:52 pm

1 stop7h 17m

Lambert-St Louis

Wed 12/17

9:50 am-6:54 pm

1 stop8h 04m

$517

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 12/5

4:45 pm-8:47 pm

1 stop5h 02m

Lambert-St Louis

Fri 1/2

6:05 am-1:49 pm

1 stop6h 44m

$532

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/11

6:30 pm-11:42 pm

1 stop6h 12m

Lambert-St Louis

Thu 12/18

7:05 am-5:25 pm

1 stop9h 20m

$532

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 2/19

2:13 pm-10:00 pm

2 stops8h 47m

Lambert-St Louis

Mon 2/23

6:30 am-3:16 pm

2 stops7h 46m

$541

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 12/5

7:00 pm-11:01 am

2 stops17h 01m

Lambert-St Louis

Fri 1/2

6:30 am-3:57 pm

1 stop8h 27m

$549

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 4/7

7:00 am-3:01 pm

1 stop9h 01m

Lambert-St Louis

Wed 4/8

4:00 pm-11:54 pm

1 stop6h 54m

$553

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/11

5:25 pm-9:47 am

3 stops17h 22m

$218

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/11

7:30 am-8:21 pm

1 stop13h 51m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 12 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 October.

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

7,995 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

Delta

7.9

Good

7,995 reviews

Delta

7.9

Good

7,995 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

Air Canada

7.1

Good

10,370 reviews

Delta

7.9

Good

7,995 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

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?
United Airlines and American Airlines can get you from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in just under 9h 28m. Your travel time can differ by up to 9h 14m. 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 25% 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 Sun Country Air (100%), Air Canada (73%) or Jazz (73%) 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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Festus

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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$584	FlexibilityNo cancel fee	On-time67%
Delta	Cheapest$452	Average$511	FlexibilityNo cancel fee	On-timeN/A

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$218+ 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 12/11. 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

1. Tell us where you want to go

2. Select your favorite providers

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

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Round-trip from

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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 October 28, 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 October 28, 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.

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 October.

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

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 October 28, 2025.