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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 361

YUL — STL
13 Oct — 20 Oct1
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

Tue 20/105:34 p.m. -
1 stop18h 16m
Sat 24/107:28 a.m. -
1 stop8h 24m
Deal found 9/9C$ 585
Thu 15/104:55 p.m. -
Nonstop2h 46m
Tue 20/1012:10 p.m. -
Nonstop2h 31m
Deal found 8/9C$ 662
Tue 20/104:55 p.m. -
Nonstop2h 46m
Thu 22/1012:10 p.m. -
Nonstop2h 31m
Deal found 9/9C$ 663
Fri 23/104:55 p.m. -
Nonstop2h 46m
Tue 3/114:05 p.m. -
1 stop7h 20m
Deal found 9/9C$ 664
Thu 24/910:10 a.m. -
1 stop4h 50m
Sun 27/92:40 p.m. -
1 stop4h 41m
Deal found 9/9C$ 685
Fri 2/1010:30 a.m. -
1 stop11h 46m
Sat 31/105:21 p.m. -
1 stop18h 04m
Deal found 10/9C$ 689
Sat 3/1010:30 a.m. -
2 stops11h 14m
Sat 31/105:00 a.m. -
1 stop10h 52m
Deal found 10/9C$ 694
Fri 23/1010:32 a.m. -
1 stop11h 20m
Tue 3/117:26 a.m. -
2 stops13h 00m
Deal found 9/9C$ 702

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

Round-trip from

C$ 585

One-way from

C$ 361

Popular in

January

Cheapest in

August

Average price

C$ 871
American Airlines
  • American Airlines
  • 20/10-24/10
  • 2 total stops
  • 26h 40m total
  • Montreal to St. Louis
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Air Canada
  • Air Canada
  • 8/10-31/12
  • Nonstop
  • 2h 46m total
  • Montreal to St. Louis
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 211 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 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
Quickest round-trip

MontrealSt. Louis

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

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 23/10

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

Nonstop2h 46m

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

Thu 8/10

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

Nonstop2h 46m

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

Thu 22/10

12:30 p.m.-12:19 a.m.

1 stop12h 49m

Lambert-St Louis

Wed 31/12

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

Nonstop0h 00m

C$ 372

MontrealSt. Louis

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

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 22/10

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

Nonstop2h 46m

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

Thu 22/10

7:00 a.m.-1:20 p.m.

1 stop7h 20m

Lambert-St Louis

Wed 31/12

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

Nonstop0h 00m

C$ 437

MontrealSt. Louis

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

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 28/10

6:00 a.m.-12:10 p.m.

1 stop7h 10m

Lambert-St Louis

Wed 31/12

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

Nonstop0h 00m

C$ 437

MontrealSt. Louis

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

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 25/9

6:47 p.m.-11:42 p.m.

1 stop5h 55m

Lambert-St Louis

Wed 31/12

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

Nonstop0h 00m

C$ 438

MontrealSt. Louis

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

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 23/1

11:10 a.m.-3:26 p.m.

1 stop5h 16m

Lambert-St Louis

Wed 27/1

4:05 p.m.-10:00 p.m.

1 stop4h 55m

C$ 730

MontrealSt. Louis

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

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 2/2

9:25 a.m.-4:53 p.m.

1 stop8h 28m

Lambert-St Louis

Wed 3/2

7:30 a.m.-5:07 p.m.

1 stop8h 37m

C$ 742

MontrealSt. Louis

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

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 23/1

8:05 a.m.-9:47 p.m.

2 stops14h 42m

Lambert-St Louis

Wed 27/1

8:05 a.m.-5:07 p.m.

1 stop8h 02m

C$ 743

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 16 resultsSorted by cheapest first
1
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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$ 613). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in January is currently the most expensive (average of C$ 1,233). 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$ 809 and C$ 1,175 in October.
The cheapest round-trip price found within the last 5 days was C$ 585 on American Airlines (20 Oct-24 Oct).

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
11,619 reviews
Check prices

Entertainment

6.8

Boarding

7.3

Food

6.3

Overall

7.1

Comfort

7.1

Crew

7.8

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
11,619 reviews
Air Canada
7.1
Good
11,619 reviews
Check prices

Entertainment

6.8

Boarding

7.3

Food

6.3

Overall

7.1

Comfort

7.1

Crew

7.8

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 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$ 730, Air Canada can have you in St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in 5h 16m. 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$ 559), 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 36% 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 (68%), Jazz (68%), United Airlines( 37%).

  • 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$ 817. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 732 on average, our data indicates C$ 979 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, 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$ 613). Flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in January is currently the most expensive (average of C$ 1,233). 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$ 559AverageC$ 809FlexibilityNo 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.

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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