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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 254

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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — STL
11 Jan — 18 Jan1
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 12 December 2025.

Sat 27/127:30 a.m.YUL - STL
1 stop14h 21mAmerican Airlines
Wed 31/124:53 p.m.STL - YUL
1 stop21h 17mAmerican Airlines
Deal found 11/12C$ 855
Fri 26/122:26 p.m.YUL - STL
1 stop6h 04mAmerican Airlines
Fri 2/15:30 a.m.STL - YUL
1 stop8h 54mAmerican Airlines
Deal found 11/12C$ 866
Fri 26/1211:10 a.m.YUL - STL
1 stop5h 19mAir Canada
Fri 2/19:55 a.m.STL - YUL
2 stops10h 57mAir Canada
Deal found 11/12C$ 1,003
Sat 27/126:45 a.m.YUL - STL
2 stops16h 58mMultiple Airlines
Wed 31/125:02 p.m.STL - YUL
2 stops18h 20mMultiple Airlines
Deal found 11/12C$ 1,077
Fri 19/127:30 a.m.YUL - STL
1 stop5h 59mAmerican Airlines
Sat 3/15:00 a.m.STL - YUL
1 stop7h 46mAmerican Airlines
Deal found 10/12C$ 1,116
Fri 19/129:25 a.m.YUL - STL
1 stop9h 29mAir Canada
Sat 3/16:35 p.m.STL - YUL
1 stop14h 45mAir Canada
Deal found 11/12C$ 1,129

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 12 December 2025.

Round-trip from

C$ 514

One-way from

C$ 254

Popular in

August

Cheapest in

May

Average price

C$ 1,049

Good one-way deal

C$ 495 or less
American Airlines
  • American Airlines
  • 21/1-4/2
  • 2 total stops
  • 27h 38m total
  • Montreal to St. Louis
Search Deals
7/1
  • 7/1
  • 3 total stops
  • 33h 03m total
  • Montreal to St. Louis
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 164 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Price to beat on a one-way flight from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis.
Search Deals

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 12 December 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 21/1

3:50 p.m.-10:20 a.m.

1 stop19h 30m

Lambert-St Louis

Wed 4/2

6:00 a.m.-3:08 p.m.

1 stop8h 08m

C$ 514

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/2

3:55 p.m.-9:34 a.m.

1 stop18h 39m

Lambert-St Louis

Wed 18/2

6:00 a.m.-3:10 p.m.

1 stop8h 10m

C$ 641

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 30/1

7:30 p.m.-12:36 p.m.

1 stop18h 06m

Lambert-St Louis

Mon 2/2

5:56 p.m.-11:12 p.m.

1 stop4h 16m

C$ 680

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 28/1

12:50 p.m.-8:37 p.m.

1 stop8h 47m

Lambert-St Louis

Sat 31/1

5:56 p.m.-11:12 p.m.

1 stop4h 16m

C$ 710

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 21/1

9:15 a.m.-9:13 p.m.

2 stops12h 58m

Lambert-St Louis

Wed 4/2

10:10 a.m.-9:42 p.m.

2 stops10h 32m

C$ 754

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

6:15 p.m.-11:38 p.m.

1 stop6h 23m

Lambert-St Louis

Sat 16/5

5:30 p.m.-11:34 p.m.

1 stop5h 04m

C$ 770

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 7/1

6:45 a.m.-2:48 p.m.

3 stops33h 03m

C$ 254

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

4:35 p.m.-9:21 a.m.

1 stop17h 46m

C$ 259

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 27/2

3:55 p.m.-9:34 a.m.

1 stop18h 39m

C$ 273

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 27/2

11:25 a.m.-6:51 a.m.

3 stops20h 26m

C$ 284

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 12 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, March is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 541). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in August is currently the most expensive (average of C$ 803). 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 12 December 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 26% on the cost of your flight, compared to a flight in the evening.

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 12 December 2025.
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
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

AMS - EWR

It was good! The first 3/4 of the trip was uncomfortably cold. Only one option for lunch that I didn’t enjoy (vegetarian).
United Airlines
7.4
Good
9,095 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

AMS - EWR

It was good! The first 3/4 of the trip was uncomfortably cold. Only one option for lunch that I didn’t enjoy (vegetarian).
WestJet
7.2
Good
3,195 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

AMS - EWR

It was good! The first 3/4 of the trip was uncomfortably cold. Only one option for lunch that I didn’t enjoy (vegetarian).
Air Canada
7.1
Good
10,516 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

AMS - EWR

It was good! The first 3/4 of the trip was uncomfortably cold. Only one option for lunch that I didn’t enjoy (vegetarian).

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.

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

    For as low as C$ 680, American Airlines can have you in St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in 18h 06m. 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, United Airlines (C$ 454), Air Canada (C$ 541), and WestJet (C$ 739) 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 43% 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 (69%), Jazz (69%), United Airlines( 69%).

  • 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$ 495. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 632 on average, our data indicates C$ 495 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, March is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 541). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in August is currently the most expensive (average of C$ 803). 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

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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.
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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 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 541AverageC$ 743FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 591AverageC$ 630FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 739AverageC$ 1,018FlexibilityNo 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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