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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 308

YUL — STL
24 Nov — 1 Dec1
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

Thu 10/124:40 p.m. -
3 stops19h 37m
Mon 14/1212:02 p.m. -
3 stops26h 58m
Deal found 25/10C$ 548
Thu 10/1212:08 p.m. -
1 stop11h 09m
Mon 14/128:24 p.m. -
1 stop14h 04m
Deal found 21/10C$ 574
Thu 19/1112:10 p.m. -
1 stop8h 54m
Thu 26/1112:44 p.m. -
2 stops25h 42m
Deal found 21/10C$ 657
Fri 20/116:10 p.m. -
1 stop15h 45m
Fri 27/117:30 a.m. -
1 stop8h 37m
Deal found 23/10C$ 695
Sun 20/124:00 p.m. -
1 stop17h 29m
Thu 31/126:00 a.m. -
1 stop8h 14m
Deal found 21/10C$ 712
Thu 19/1112:10 p.m. -
1 stop8h 54m
Sat 21/118:12 p.m. -
1 stop14h 14m
Deal found 25/10C$ 733
Thu 19/119:25 a.m. -
1 stop13h 15m
Thu 26/116:00 a.m. -
1 stop10h 07m
Deal found 21/10C$ 744
Tue 24/116:45 a.m. -
2 stops18h 14m
Mon 30/116:35 p.m. -
3 stops23h 37m
Deal found 23/10C$ 749
Fri 11/121:04 p.m. -
2 stops11h 58m
Mon 14/128:24 p.m. -
1 stop14h 04m
Deal found 21/10C$ 755

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

Round-trip from

C$ 548

One-way from

C$ 308

Popular in

January

Cheapest in

August

Average price

C$ 1,161
10/12-14/12
  • 10/12-14/12
  • 6 total stops
  • 46h 35m total
  • Montreal to St. Louis
Search Deals
American Airlines
  • American Airlines
  • 7/12-31/12
  • 1 total stop
  • 12h 54m total
  • Montreal to St. Louis
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 69 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2026
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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

Cheapest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 7/12

12:08 p.m.-12:02 a.m.

1 stop12h 54m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 308
Quickest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 24/11

12:10 p.m.-7:50 p.m.

1 stop8h 40m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 333

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 3/12

4:40 p.m.-11:17 a.m.

3 stops19h 37m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 342

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 3/12

12:08 p.m.-7:58 p.m.

1 stop8h 50m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 345

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 6/12

9:45 a.m.-1:21 p.m.

3 stops28h 36m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 359

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 8/12

1:04 p.m.-12:02 a.m.

2 stops11h 58m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 361

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 24/11

9:45 a.m.-1:31 p.m.

3 stops28h 46m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 370

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 24/11

6:50 p.m.-3:43 p.m.

2 stops21h 53m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 396

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 6/12

9:25 a.m.-10:59 p.m.

1 stop14h 34m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 427

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 23/12

9:25 a.m.-7:02 p.m.

1 stop10h 37m

Lambert-St Louis

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 517

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/10

Showing 1-10 of 21 resultsSorted by cheapest first
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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

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, August is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 619). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in January is currently the most expensive (average of C$ 1,245). 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?

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?

Airfare is below average for this route at the moment.

Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flights typically cost between C$ 864 and C$ 1,086 in December.
The cheapest round-trip price found within the last 5 days was C$ 548 on Multiple Airlines (10 Dec-14 Dec).

Reviews of airlines servicing St. Louis

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
11,810 reviews
Check prices

Crew

7.8

Boarding

7.3

Entertainment

6.8

Overall

7.1

Food

6.3

Comfort

7.1

Reviews

1 / 20
8.0
Excellent

Micheline,Aug 2026

YUL - LAX

The wheelchair was offered asa i presented myself, the staff was attentive, friendly and helpful. The check in was quick and i was delivered to my gate in a timely manner. My carryon bag did not fit under the aisle seat, but does fit under the middle seat. I had no access to my carryon as it had to go in the overhead bin. The wheelchair was available as i deplaned. The attendant was very helpful and friendly. I’ve noticed a big improvement in this service during the last few years. Thanks.🙏
Air Canada
7.1
Good
11,810 reviews
Air Canada
7.1
Good
11,810 reviews
Check prices

Crew

7.8

Boarding

7.3

Entertainment

6.8

Overall

7.1

Food

6.3

Comfort

7.1

Reviews

1 / 20
8.0
Excellent

Micheline,Aug 2026

YUL - LAX

The wheelchair was offered asa i presented myself, the staff was attentive, friendly and helpful. The check in was quick and i was delivered to my gate in a timely manner. My carryon bag did not fit under the aisle seat, but does fit under the middle seat. I had no access to my carryon as it had to go in the overhead bin. The wheelchair was available as i deplaned. The attendant was very helpful and friendly. I’ve noticed a big improvement in this service during the last few years. Thanks.🙏

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 0 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$ 662, United Airlines can have you in St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in 9h 27m. Montreal Pierre Elliott Trudeau Intl Airport and St. Louis are separated by a distance of 1556 km.

  • 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$ 565), 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 38% less than the average price by searching for this airline.

  • 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 (67%), Jazz (67%), United Airlines( 67%).

  • 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, August is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (average of C$ 619). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in January is currently the most expensive (average of C$ 1,245). 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

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 565AverageC$ 827FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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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.

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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.

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