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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 252

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 24/4. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — STL
31 Mar — 7 Apr1
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 26 March 2025.

Round-trip from

C$ 734

One-way from

C$ 252

Popular in

December

Cheapest in

August

Average price

C$ 800
American Airlines
  • American Airlines
  • 18/4-21/4
  • 2 total stops
  • 14h 31m total
  • Montreal to St. Louis
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24/4
  • 24/4
  • 1 total stop
  • 9h 00m total
  • Montreal to St. Louis
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Highest demand for flights based on searches. 7% potential increase in price (C$ 85 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 37 potential savings vs. average RT price).
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Average for round-trip flights in March 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 26 March 2025.

Tue 1/46:30 a.m.YUL - STL
1 stop12h 22mMultiple Airlines
Tue 8/46:47 p.m.STL - YUL
1 stop19h 08mMultiple Airlines
Deal found 25/3C$ 576
Fri 18/412:55 p.m.YUL - STL
1 stop9h 32mAmerican Airlines
Mon 21/45:45 a.m.STL - YUL
1 stop4h 59mAmerican Airlines
Deal found 25/3C$ 734
Mon 16/66:10 p.m.YUL - STL
Nonstop2h 48mAir Canada
Sun 22/61:30 p.m.STL - YUL
Nonstop2h 30mAir Canada
Deal found 25/3C$ 779
Mon 16/66:05 p.m.YUL - STL
2 stops22h 25mUnited Airlines
Sun 22/68:10 a.m.STL - YUL
1 stop4h 49mUnited Airlines
Deal found 25/3C$ 815
Mon 16/68:10 a.m.YUL - STL
2 stops26h 29mWestJet
Sun 22/66:30 a.m.STL - YUL
2 stops17h 13mWestJet
Deal found 25/3C$ 910
Wed 26/36:00 a.m.YUL - STL
1 stop9h 49mDelta
Wed 2/46:10 a.m.STL - YUL
1 stop9h 18mDelta
Deal found 25/3C$ 1,066

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 26 March 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

Fri 18/4

12:55 p.m.-9:27 p.m.

1 stop9h 32m

Lambert-St Louis

Mon 21/4

5:45 a.m.-11:44 a.m.

1 stop4h 59m

C$ 734

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 16/6

6:45 a.m.-6:32 p.m.

2 stops36h 47m

Lambert-St Louis

Sun 22/6

7:37 p.m.-10:15 p.m.

3 stops25h 38m

C$ 742

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 16/6

6:10 p.m.-7:58 p.m.

Nonstop2h 48m

Lambert-St Louis

Sun 22/6

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

Nonstop2h 30m

C$ 779

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 16/6

6:05 p.m.-3:30 p.m.

2 stops22h 25m

Lambert-St Louis

Sun 22/6

8:10 a.m.-1:59 p.m.

1 stop4h 49m

C$ 815

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 16/6

8:10 a.m.-9:39 a.m.

2 stops26h 29m

Lambert-St Louis

Sun 22/6

6:30 a.m.-12:43 a.m.

2 stops17h 13m

C$ 910

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 24/4

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

1 stop9h 00m

C$ 252

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 24/4

8:30 a.m.-3:47 p.m.

2 stops8h 17m

C$ 373

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 7/7

12:45 p.m.-8:47 p.m.

1 stop9h 02m

C$ 441

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 19/9

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

Nonstop2h 47m

C$ 465

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 19/9

12:45 p.m.-6:03 p.m.

1 stop6h 18m

C$ 469

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/3

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 26 March 2025.

It’s optimal to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis at noon. By choosing this option you can save up to 18% on the cost of your flight, compared to a flight in the afternoon.

Rainfall in St. Louis by month

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

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.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 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).

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 26 March 2025.
Read reviews from past customers who have flown Delta, United Airlines and American Airlines from Montreal to St. Louis. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,891 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,891 reviews
Delta
8.0
Very good
7,891 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,608 reviews
Delta
8.0
Very good
7,891 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,891 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
WestJet
7.2
Good
2,785 reviews
Delta
8.0
Very good
7,891 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air Canada
7.0
Good
8,960 reviews
Delta
8.0
Very good
7,891 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 0 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$ 734), Air Canada (C$ 779), and United Airlines (C$ 815) 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 6% 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$ 373 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on WestJet and Air Canada, with prices starting from C$ 441 and C$ 465, respectively.

  • 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 Montreal Pierre Elliott Trudeau Intl Airport?

Book flights to Montreal Pierre Elliott Trudeau Intl Airport if you plan to visit one of these locations
St. Peters
Chesterfield

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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.
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 26 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 560AverageC$ 762FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 613AverageC$ 774FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 698AverageC$ 1,024FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

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

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

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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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