What’s the fastest layover option from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Flights via Detroit (DTW) have the shortest average one-way travel time for 1-stop routes: 5h 03m.

What’s the cheapest layover airport for flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Toronto (YYZ) is the most affordable 1-stop option, with an average round-trip price of C$ 883.

What’s the top layover airport for flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Detroit (DTW) – chosen by Cheapflights users on 50% of one-stop itineraries from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis on Cheapflights.

Which airport typically offers the quickest layover for flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Flights via Detroit (DTW) offer the fastest connection on this route, with an average layover time of 1h 09m.

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. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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

The most flights from YUL to STL 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).

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 mm per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

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

Before booking your flight to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport, check out the most reliable airlines to get you to your destination on time: Air Canada (65%), Jazz (65%), United Airlines( 65%).

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

Consider Air Canada, United Airlines or WestJet when booking your flight. These represent the most popular airlines when flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis.

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

Flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis lean towards being more expensive in June. Prices are generally better when you fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in July, with the cheapest ticket starting at C$ 396.

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

Located just 20.4 km from the city centre, Lambert-St Louis is the airport most travellers will use when flying to St. Louis from Montreal Pierre Elliott Trudeau Intl. Booking flights from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis (STL) should be relatively easy as there are 2 daily inbound flights from Montreal Pierre Elliott Trudeau Intl from 3 different airlines.

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.

C$ 267+ Cheap Flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

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

Airfare is below average for this route at the moment. Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flights typically cost between C$ 743 and C$ 825 in November. The cheapest round-trip price found within the last 3 days was C$ 509 on Multiple Airlines (7 Nov-14 Nov).

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

Round-trip from	C$ 509
One-way from	C$ 267
Popular in	August
Cheapest in	May
Average price	C$ 776
Good round-trip deal	C$ 1,248 or less
Good one-way deal	C$ 497 or less

7/11-14/11
3 total stops
23h 45m total
Montreal to St. Louis

Search Deals

30/10
3 total stops
27h 22m total
Montreal to St. Louis

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (C$ 152 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (C$ 31 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

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

Search Deals

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

Search Deals

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 11 September 2025.

Fri 7/116:45 a.m.YUL - STL

2 stops14h 27mMultiple Airlines

Fri 14/112:12 p.m.STL - YUL

1 stop9h 18mMultiple Airlines

Deal found 9/9C$ 509

Thu 6/112:30 p.m.YUL - STL

2 stops24h 27mMultiple Airlines

Thu 13/1112:20 p.m.STL - YUL

1 stop25h 50mMultiple Airlines

Deal found 9/9C$ 542

Sun 26/105:24 p.m.YUL - STL

1 stop15h 45mAmerican Airlines

Sun 2/115:00 a.m.STL - YUL

1 stop8h 11mAmerican Airlines

Deal found 11/9C$ 543

Wed 5/117:30 p.m.YUL - STL

1 stop13h 43mDelta

Wed 12/116:09 p.m.STL - YUL

2 stops13h 27mDelta

Deal found 10/9C$ 550

Mon 27/107:30 p.m.YUL - STL

1 stop13h 43mDelta

Mon 3/111:35 p.m.STL - YUL

1 stop18h 02mDelta

Deal found 11/9C$ 558

Thu 6/113:52 p.m.YUL - STL

1 stop9h 04mAmerican Airlines

Thu 13/116:00 a.m.STL - YUL

1 stop5h 15mAmerican Airlines

Deal found 9/9C$ 588

Sun 26/104:35 p.m.YUL - STL

2 stops27h 51mMultiple Airlines

Sun 2/1110:57 a.m.STL - YUL

1 stop27h 13mMultiple Airlines

Deal found 11/9C$ 604

Wed 8/108:20 a.m.YUL - STL

1 stop8h 24mUnited Airlines

Fri 10/1012:25 p.m.STL - YUL

1 stop24h 29mUnited Airlines

Deal found 11/9C$ 650

Mon 27/106:45 a.m.YUL - STL

2 stops13h 41mMultiple Airlines

Mon 3/1110:25 a.m.STL - YUL

1 stop13h 05mMultiple Airlines

Deal found 11/9C$ 661

Wed 5/1110:50 a.m.YUL - STL

2 stops11h 50mUnited Airlines

Wed 12/116:30 a.m.STL - YUL

2 stops11h 32mUnited Airlines

Deal found 10/9C$ 686

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 11 September 2025.

Thu 6/112:30 p.m.YUL - STL

2 stops24h 27mMultiple Airlines

Thu 13/1112:20 p.m.STL - YUL

1 stop25h 50mMultiple Airlines

Deal found 9/9C$ 542

Wed 5/117:30 p.m.YUL - STL

1 stop13h 43mDelta

Wed 12/116:09 p.m.STL - YUL

2 stops13h 27mDelta

Deal found 10/9C$ 550

Thu 6/113:52 p.m.YUL - STL

1 stop9h 04mAmerican Airlines

Thu 13/116:00 a.m.STL - YUL

1 stop5h 15mAmerican Airlines

Deal found 9/9C$ 588

Wed 5/116:00 a.m.YUL - STL

1 stop12h 39mUnited Airlines

Wed 12/116:30 a.m.STL - YUL

1 stop11h 10mUnited Airlines

Deal found 10/9C$ 686

Fri 24/106:35 p.m.YUL - STL

2 stops39h 47mMultiple Airlines

Fri 31/102:12 p.m.STL - YUL

1 stop9h 18mMultiple Airlines

Deal found 9/9C$ 563

Mon 17/1112:50 p.m.YUL - STL

1 stop8h 56mDelta

Thu 20/112:36 p.m.STL - YUL

1 stop7h 50mDelta

Deal found 11/9C$ 723

Mon 17/113:49 p.m.YUL - STL

1 stop9h 07mAmerican Airlines

Thu 20/116:00 a.m.STL - YUL

1 stop8h 22mAmerican Airlines

Deal found 10/9C$ 725

Thu 9/1010:30 a.m.YUL - STL

1 stop13h 25mAmerican Airlines

Thu 16/106:00 a.m.STL - YUL

1 stop4h 40mAmerican Airlines

Deal found 11/9C$ 750

Mon 17/116:45 a.m.YUL - STL

2 stops14h 27mMultiple Airlines

Thu 20/1112:20 p.m.STL - YUL

1 stop25h 50mMultiple Airlines

Deal found 10/9C$ 772

Thu 9/106:35 p.m.YUL - STL

2 stops17h 02mMultiple Airlines

Thu 16/1010:57 a.m.STL - YUL

1 stop26h 53mMultiple Airlines

Deal found 11/9C$ 788

Direct flights from Pierre Elliott Trudeau Intl to St. Louis
Explore direct flight options from Pierre Elliott Trudeau Intl to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 11 September 2025.

Thu 25/96:10 p.m.YUL - STL

Nonstop2h 47mAir Canada

Sun 28/91:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Deal found 9/9C$ 984

Thu 25/96:10 p.m.YUL - STL

Nonstop2h 47mAir Canada

Mon 29/91:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Deal found 9/9C$ 1,009

Fri 26/96:10 p.m.YUL - STL

Nonstop2h 47mAir Canada

Mon 29/91:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Deal found 9/9C$ 1,253

Sun 28/96:10 p.m.YUL - STL

Nonstop2h 47mUnited Airlines

Mon 29/91:30 p.m.STL - YUL

Nonstop2h 30mUnited Airlines

Deal found 11/9C$ 1,598

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 11 September 2025 and is based on user searches.

Thu 25/97:00 a.m.YUL - STL

1 stop9h 25mDelta

Mon 29/95:28 p.m.STL - YUL

1 stop15h 38mDelta

Deal found 9/9C$ 847

Thu 25/97:00 a.m.YUL - STL

1 stop12h 10mMultiple Airlines

Sun 28/910:35 a.m.STL - YUL

2 stops30h 20mMultiple Airlines

Deal found 9/9C$ 863

Fri 26/96:59 p.m.YUL - STL

1 stop5h 25mDelta

Mon 29/95:28 p.m.STL - YUL

1 stop15h 38mDelta

Deal found 9/9C$ 906

Thu 9/1010:30 a.m.YUL - STL

1 stop13h 25mAmerican Airlines

Thu 16/106:00 a.m.STL - YUL

1 stop4h 40mAmerican Airlines

Deal found 11/9C$ 750

Thu 9/106:35 p.m.YUL - STL

2 stops17h 02mMultiple Airlines

Thu 16/1010:57 a.m.STL - YUL

1 stop26h 53mMultiple Airlines

Deal found 11/9C$ 788

Fri 24/106:35 p.m.YUL - STL

2 stops39h 47mMultiple Airlines

Fri 31/102:12 p.m.STL - YUL

1 stop9h 18mMultiple Airlines

Deal found 9/9C$ 563

Fri 24/1012:30 p.m.YUL - STL

1 stop12h 24mAmerican Airlines

Fri 31/1012:51 p.m.STL - YUL

1 stop8h 49mAmerican Airlines

Deal found 9/9C$ 597

Sun 26/105:24 p.m.YUL - STL

1 stop15h 45mAmerican Airlines

Sun 2/115:00 a.m.STL - YUL

1 stop8h 11mAmerican Airlines

Deal found 11/9C$ 543

Sun 26/104:35 p.m.YUL - STL

2 stops27h 51mMultiple Airlines

Sun 2/1110:57 a.m.STL - YUL

1 stop27h 13mMultiple Airlines

Deal found 11/9C$ 604

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 11 September 2025.

Thu 30/106:45 a.m.YUL - STL

3 stops27h 22mMultiple Airlines

Deal found 10/9C$ 267

Sat 25/106:45 a.m.YUL - STL

2 stops27h 37mMultiple Airlines

Deal found 10/9C$ 287

Sat 4/1012:31 p.m.YUL - STL

1 stop9h 01mAmerican Airlines

Deal found 10/9C$ 290

Sat 25/1012:30 p.m.YUL - STL

1 stop10h 36mAmerican Airlines

Deal found 10/9C$ 295

Sun 2/114:35 p.m.YUL - STL

2 stops41h 32mMultiple Airlines

Deal found 10/9C$ 302

Thu 30/1012:30 p.m.YUL - STL

1 stop12h 24mAmerican Airlines

Deal found 11/9C$ 313

Sun 26/105:24 p.m.YUL - STL

1 stop15h 45mAmerican Airlines

Deal found 11/9C$ 317

Sun 26/104:35 p.m.YUL - STL

2 stops27h 51mMultiple Airlines

Deal found 11/9C$ 324

Wed 17/96:45 a.m.YUL - STL

3 stops33h 19mMultiple Airlines

Deal found 11/9C$ 358

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 6/11

2:30 p.m.-1:57 p.m.

2 stops24h 27m

Lambert-St Louis

Thu 13/11

12:20 p.m.-3:10 p.m.

1 stop25h 50m

C$ 542

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

7:30 p.m.-8:13 a.m.

1 stop13h 43m

Lambert-St Louis

Wed 12/11

6:09 p.m.-8:36 a.m.

2 stops13h 27m

C$ 550

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 24/10

6:35 p.m.-9:22 a.m.

2 stops39h 47m

Lambert-St Louis

Fri 31/10

2:12 p.m.-12:30 a.m.

1 stop9h 18m

C$ 563

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 6/11

3:52 p.m.-11:56 p.m.

1 stop9h 04m

Lambert-St Louis

Thu 13/11

6:00 a.m.-12:15 p.m.

1 stop5h 15m

C$ 588

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

6:00 a.m.-5:39 p.m.

1 stop12h 39m

Lambert-St Louis

Wed 12/11

6:30 a.m.-6:40 p.m.

1 stop11h 10m

C$ 686

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 17/11

12:50 p.m.-8:46 p.m.

1 stop8h 56m

Lambert-St Louis

Thu 20/11

2:36 p.m.-11:26 p.m.

1 stop7h 50m

C$ 723

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 17/11

3:49 p.m.-11:56 p.m.

1 stop9h 07m

Lambert-St Louis

Thu 20/11

6:00 a.m.-3:22 p.m.

1 stop8h 22m

C$ 725

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/10

10:30 a.m.-10:55 p.m.

1 stop13h 25m

Lambert-St Louis

Thu 16/10

6:00 a.m.-11:40 a.m.

1 stop4h 40m

C$ 750

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 17/11

6:45 a.m.-8:12 p.m.

2 stops14h 27m

Lambert-St Louis

Thu 20/11

12:20 p.m.-3:10 p.m.

1 stop25h 50m

C$ 772

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/10

6:35 p.m.-10:37 a.m.

2 stops17h 02m

Lambert-St Louis

Thu 16/10

10:57 a.m.-2:50 p.m.

1 stop26h 53m

C$ 788

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 18 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

Prices

Airlines

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

Currently, January is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 365). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in September is currently the most expensive (average of C$ 491). 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 optimal to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in the morning. By choosing this option you can save up to 26% on the cost of your flight, compared to a flight in the afternoon.

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

Reviews of airlines servicing St. Louis

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

United Airlines

7.4

Good

8,937 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

United Airlines

7.4

Good

8,937 reviews

United Airlines

7.4

Good

8,937 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

WestJet

7.2

Good

3,091 reviews

United Airlines

7.4

Good

8,937 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Air Canada

7.1

Good

10,000 reviews

United Airlines

7.4

Good

8,937 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

What airport do you fly into for flights to St. Louis from Montreal Pierre Elliott Trudeau Intl?
Located just 20.4 km from the city centre, Lambert-St Louis is the airport most travellers will use when flying to St. Louis from Montreal Pierre Elliott Trudeau Intl. Booking flights from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis (STL) should be relatively easy as there are 2 daily inbound flights from Montreal Pierre Elliott Trudeau Intl from 3 different airlines.
How long is the flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?
For as low as C$ 588, Delta can have you in St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in 9h 04m. Montreal Pierre Elliott Trudeau Intl Airport and St. Louis are separated by a distance of 1556 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis round-trip?
According to our current data, Air Canada (C$ 543), United Airlines (C$ 594), and WestJet (C$ 743) offers the cheapest pricing from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis. You may be able to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis for 32% less than the average price by searching for these airlines.
What are the most reliable airlines from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?
Before booking your flight to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport, check out the most reliable airlines to get you to your destination on time: Air Canada (65%), Jazz (65%), United Airlines( 65%).
What are the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?
Looking at all options, your cheapest flight can be booked for C$ 497. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 509 on average, our data indicates C$ 962 when flying 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?
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, January is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 365). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in September is currently the most expensive (average of C$ 491). 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

Chesterfield

St. Peters

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from Pierre Elliott Trudeau Intl to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	CheapestC$ 543	AverageC$ 747	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
United Airlines	CheapestC$ 594	AverageC$ 633	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
WestJet	CheapestC$ 743	AverageC$ 1,055	FlexibilityNo cancel fee	On-time60%	Search WestJet flights

Fly with Cheapflights

How does Cheapflights help users find flights from Pierre Elliott Trudeau Intl to St. Louis?

Cheapflights makes it easy to find Pierre Elliott Trudeau Intl to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Pierre Elliott Trudeau Intl to St. Louis?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Pierre Elliott Trudeau Intl to St. Louis for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Pierre Elliott Trudeau Intl to St. Louis with no change fees?

Need flexible booking options for your flight to St. Louis from Pierre Elliott Trudeau Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Pierre Elliott Trudeau Intl to St. Louis become cheaper?

Yes, Cheapflights offers price alerts on Pierre Elliott Trudeau Intl to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 267

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 30/10. Fares are subject to change and may not be available on all flights or dates of travel.

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

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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 11 September 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 11 September 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?

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

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

What’s the top layover airport for flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

What’s the fastest layover option from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

What’s the fastest layover option from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Which airport typically offers the quickest layover for flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with United Airlines,WestJet, andAir Canada from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis by reading reviews from past customers. Users have also rated airlines 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?

What are the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport 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 11 September 2025.