Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 259

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 19/9. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — STL
3 Aug — 10 Aug1
1 adult

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

Discover tips and strategies to find the most affordable flight options for your journey from Pierre Elliott Trudeau Intl (YUL) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 29 July 2025.

Round-trip from

C$ 434

One-way from

C$ 259

Popular in

December

Cheapest in

May

Average price

C$ 918

Good one-way deal

C$ 492 or less
American Airlines
  • American Airlines
  • 10/9-17/9
  • 2 total stops
  • 17h 11m total
  • Montreal to St. Louis
Search Deals
American Airlines
  • American Airlines
  • 19/9
  • 1 total stop
  • 17h 11m total
  • Montreal to St. Louis
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
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 29 July 2025.

Wed 10/912:31 p.m.YUL - STL
1 stop9h 01mAmerican Airlines
Wed 17/97:23 a.m.STL - YUL
1 stop8h 10mAmerican Airlines
Deal found 27/7C$ 434
Thu 28/86:10 p.m.YUL - STL
Nonstop2h 50mAir Canada
Mon 1/91:30 p.m.STL - YUL
Nonstop2h 30mAir Canada
Deal found 27/7C$ 626
Wed 10/96:00 a.m.YUL - STL
2 stops11h 06mDelta
Wed 17/96:05 a.m.STL - YUL
1 stop9h 00mDelta
Deal found 28/7C$ 648
Fri 12/97:10 p.m.YUL - STL
2 stops16h 30mUnited Airlines
Fri 19/97:04 p.m.STL - YUL
1 stop17h 50mUnited Airlines
Deal found 29/7C$ 653
Fri 12/97:00 a.m.YUL - STL
3 stops10h 35mMultiple Airlines
Fri 19/91:00 p.m.STL - YUL
3 stops25h 20mMultiple Airlines
Deal found 29/7C$ 660

Cheapflights Fare Finder

 
Customize your flight search to find flights from Pierre Elliott Trudeau Intl to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 July 2025.
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

Pierre Elliott Trudeau Intl

Fly to

St. Louis

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 10/9

12:31 p.m.-8:32 p.m.

1 stop9h 01m

Lambert-St Louis

Wed 17/9

7:23 a.m.-4:33 p.m.

1 stop8h 10m

C$ 434

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 28/8

6:10 p.m.-8:00 p.m.

Nonstop2h 50m

Lambert-St Louis

Mon 1/9

1:30 p.m.-5:00 p.m.

Nonstop2h 30m

C$ 626

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 28/8

8:30 p.m.-1:32 p.m.

2 stops18h 02m

Lambert-St Louis

Mon 1/9

2:30 p.m.-1:20 p.m.

3 stops21h 50m

C$ 641

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 10/9

6:00 a.m.-4:06 p.m.

2 stops11h 06m

Lambert-St Louis

Wed 17/9

6:05 a.m.-4:05 p.m.

1 stop9h 00m

C$ 648

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 12/9

7:10 p.m.-10:40 a.m.

2 stops16h 30m

Lambert-St Louis

Fri 19/9

7:04 p.m.-1:54 p.m.

1 stop17h 50m

C$ 653

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 19/9

5:15 p.m.-9:26 a.m.

1 stop17h 11m

C$ 259

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 11/9

6:45 a.m.-1:02 p.m.

2 stops31h 17m

C$ 311

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 19/8

6:15 a.m.-2:33 p.m.

1 stop9h 18m

C$ 353

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 19/9

6:10 p.m.-7:57 p.m.

Nonstop2h 47m

C$ 362

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 14/9

7:00 a.m.-12:31 p.m.

1 stop6h 31m

C$ 375

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Showing 1-10 of 11 results
1
2

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, 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?

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 29 July 2025.

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 22% on the cost of your flight, compared to a flight in the afternoon.

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

Explore weekly flight availability from Pierre Elliott Trudeau Intl to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 29 July 2025.

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).

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

Share of one-stop round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis chosen by Cheapflights users in the past 12 months, using the same layover each way.

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

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

Average round-trip fare for 1-stop flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Toronto (YYZ) is the most affordable 1-stop option, with an average round-trip price of C$ 874.

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

Shortest average travel time for 1-stop one-way flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Detroit (DTW) have the shortest average one-way travel time for 1-stop routes: 2h 56m.

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

Average layover duration for 1-stop one-way flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

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

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated 29 July 2025.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican Airlines 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.
Delta
8.0
Very good
7,979 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
WestJet
7.2
Good
2,972 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air Canada
7.1
Good
9,826 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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?

    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.

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

    According to our current data, American Airlines (C$ 434), Air Canada (C$ 626), and Delta (C$ 648) 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 45% less than the average price by searching for these airlines.

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

    C$ 259 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 United Airlines and Air Canada, with prices starting from C$ 353 and C$ 362, respectively.

  • 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: Jazz (67%), Air Canada (63%), United Airlines( 62%).

  • 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$ 492. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 527 on average our data indicates C$ 492 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

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Chesterfield
St. Peters

Browse thousands of different options on Cheapflights for your next trip

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

Alternative routes for Pierre Elliott Trudeau Intl to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Pierre Elliott Trudeau Intl to Kansas City flights
Pierre Elliott Trudeau Intl to Cape Girardeau flights

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

Discover the top 3 airlines that operate flights from Pierre Elliott Trudeau Intl to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 538AverageC$ 739FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 588AverageC$ 741FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 735AverageC$ 1,013FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

100% Free

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

Book with Flexibility

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

Travel Smart

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