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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 329

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 29/6. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — STL
10 Jul — 17 Jul1
1 adult
1 adult, Economy, 0 bags

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

Enter your travel dates to find the best prices.

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 10 June 2026.

Thu 15/104:55 p.m.
YUL
-
STL
Nonstop2h 46m
Air Canada
Mon 19/1012:10 p.m.
STL
-
YUL
Nonstop2h 31m
Air Canada
Deal found 8/6C$ 618
Sat 8/84:40 p.m.
YUL
-
STL
1 stop4h 42m
Air Canada
Sun 16/812:10 p.m.
STL
-
YUL
Nonstop2h 32m
Air Canada
Deal found 8/6C$ 629
Thu 2/79:45 a.m.
YUL
-
STL
1 stop5h 38m
Air Canada
Wed 8/79:30 a.m.
STL
-
YUL
1 stop7h 00m
Air Canada
Deal found 9/6C$ 667
Tue 25/84:55 p.m.
YUL
-
STL
Nonstop2h 47m
Air Canada
Fri 28/88:55 a.m.
STL
-
YUL
1 stop8h 05m
Air Canada
Deal found 5/6C$ 682
Thu 1/106:00 a.m.
YUL
-
STL
1 stop8h 06m
Delta
Mon 5/101:55 p.m.
STL
-
YUL
1 stop8h 27m
Delta
Deal found 10/6C$ 686

Find 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 10 June 2026.

Round-trip from

C$ 618

One-way from

C$ 329

Popular in

December

Cheapest in

July

Average price

C$ 1,003
Air Canada
  • Air Canada
  • 15/10-19/10
  • Nonstop
  • 5h 17m total
  • Montreal to St. Louis
Search Deals
29/6
  • 29/6
  • 2 total stops
  • 38h 32m total
  • Montreal to St. Louis
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 152 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
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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 10 June 2026.
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

Cheapest round-trip
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 15/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Lambert-St Louis

Mon 19/10

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 618

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 1/10

6:00 a.m.-1:06 p.m.

1 stop8h 06m

Lambert-St Louis

Mon 5/10

1:55 p.m.-11:22 p.m.

1 stop8h 27m

C$ 686

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 24/11

6:00 a.m.-9:36 a.m.

1 stop4h 36m

Lambert-St Louis

Wed 25/11

2:18 p.m.-11:10 p.m.

1 stop7h 52m

C$ 686

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 7/10

6:00 a.m.-1:20 p.m.

1 stop8h 20m

Lambert-St Louis

Thu 15/10

2:18 p.m.-11:10 p.m.

1 stop7h 52m

C$ 693

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

6:47 p.m.-11:58 p.m.

1 stop6h 11m

Lambert-St Louis

Sun 23/8

6:30 a.m.-4:20 p.m.

1 stop8h 50m

C$ 693

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 24/8

7:00 a.m.-4:17 p.m.

1 stop10h 17m

Lambert-St Louis

Sat 29/8

5:42 p.m.-11:40 p.m.

1 stop4h 58m

C$ 694

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 13/7

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

Lambert-St Louis

Wed 15/7

6:00 a.m.-7:45 p.m.

2 stops12h 45m

C$ 708

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 7/7

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

Lambert-St Louis

Tue 14/7

5:59 p.m.-10:40 a.m.

1 stop15h 41m

C$ 708
Cheapest one-way

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 27/10

6:45 a.m.-9:40 a.m.

3 stops27h 55m

C$ 378

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

7:00 a.m.-4:17 p.m.

1 stop10h 17m

C$ 388

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/6

Showing 1-10 of 20 resultsSorted by cheapest first
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, July is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 721). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in December is currently the most expensive (average of C$ 1,085). 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 10 June 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis as you normally would.

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 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 10 June 2026.
Get a feel of what it's like to fly with Air 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.
Air Canada
7.1
Good
11,154 reviews
Check prices

Entertainment

6.8

Food

6.3

Boarding

7.3

Comfort

7.1

Crew

7.8

Overall

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jun 2026

YUL - LYS

The flight was cancelled. We were rebooked the next day on Air France but had a 12 hour layover in Paris. We lost 1 1/2 days of our vacation.
Air Canada
7.1
Good
11,154 reviews
Air Canada
7.1
Good
11,154 reviews
Check prices

Entertainment

6.8

Food

6.3

Boarding

7.3

Comfort

7.1

Crew

7.8

Overall

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jun 2026

YUL - LYS

The flight was cancelled. We were rebooked the next day on Air France but had a 12 hour layover in Paris. We lost 1 1/2 days of our vacation.

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 1 airline.

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

    For as low as C$ 618, Air Canada can have you in St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in 2h 46m. 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 is the cheapest airline to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis round-trip?

    According to our current data, Air Canada (C$ 563), 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 34% less than the average price by searching for this airline.

  • 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, July is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 721). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in December is currently the most expensive (average of C$ 1,085). 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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Alternative routes for Pierre Elliott Trudeau Intl to St. Louis

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Top airline flying from Pierre Elliott Trudeau Intl to St. Louis

Discover the top airline 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 10 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 563AverageC$ 823FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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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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