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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 287

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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
14 lug — 21 lug1
1 adult
1 adult, Economy, 0 bags

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

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to Pierre Elliott Trudeau Intl
Explore the most affordable flight options available from St. Louis to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 giugno 2026.

mar 18/86:00 a.m.
STL
-
YUL
1 stop9h 53m
American Airlines
ven 21/85:34 p.m.
YUL
-
STL
1 stop15h 49m
American Airlines
Deal found 12/6C$ 676
mer 16/95:00 a.m.
STL
-
YUL
1 stop10h 53m
American Airlines
mer 23/95:34 p.m.
YUL
-
STL
1 stop17h 46m
American Airlines
Deal found 12/6C$ 718
sab 8/85:00 a.m.
STL
-
YUL
1 stop10h 54m
American Airlines
mar 18/812:30 p.m.
YUL
-
STL
1 stop12h 44m
American Airlines
Deal found 12/6C$ 733
ven 7/84:57 p.m.
STL
-
YUL
2 stops24h 18m
Multiple Airlines
ven 14/86:47 p.m.
YUL
-
STL
1 stop15h 33m
Multiple Airlines
Deal found 9/6C$ 736
mar 21/76:34 p.m.
STL
-
YUL
2 stops22h 41m
Multiple Airlines
ven 24/79:30 a.m.
YUL
-
STL
1 stop12h 05m
Multiple Airlines
Deal found 9/6C$ 741
sab 4/75:06 p.m.
STL
-
YUL
2 stops24h 09m
Multiple Airlines
lun 13/76:47 p.m.
YUL
-
STL
1 stop6h 06m
Multiple Airlines
Deal found 10/6C$ 745
lun 3/84:57 p.m.
STL
-
YUL
2 stops44h 11m
Multiple Airlines
ven 14/86:47 p.m.
YUL
-
STL
1 stop15h 33m
Multiple Airlines
Deal found 9/6C$ 751
mar 4/86:34 p.m.
STL
-
YUL
2 stops23h 44m
Multiple Airlines
gio 13/85:10 p.m.
YUL
-
STL
1 stop4h 32m
Multiple Airlines
Deal found 9/6C$ 754
lun 10/84:57 p.m.
STL
-
YUL
2 stops20h 11m
Multiple Airlines
mer 12/85:10 p.m.
YUL
-
STL
1 stop4h 32m
Multiple Airlines
Deal found 9/6C$ 759
ven 3/73:20 p.m.
STL
-
YUL
1 stop17h 28m
American Airlines
mer 8/712:30 p.m.
YUL
-
STL
1 stop12h 46m
American Airlines
Deal found 13/6C$ 765

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

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Pierre Elliott Trudeau Intl (YUL). 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 14 giugno 2026.

Round-trip from

C$ 676

One-way from

C$ 287

Popular in

October

Cheapest in

August

Average price

C$ 1,071
American Airlines
  • American Airlines
  • 18/8-21/8
  • 2 total stops
  • 25h 42m total
  • St. Louis to Montreal
Search Deals
10/7
  • 10/7
  • 3 total stops
  • 24h 13m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 155 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 47 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 St. Louis to Pierre Elliott Trudeau Intl 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 14 giugno 2026.
Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mar 6/10

11:35 a.m.-5:30 p.m.

1 stop4h 55m

Montreal Pierre Elliott Trudeau Intl

mer 14/10

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

Nonstop2h 46m

C$ 863

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mer 16/9

8:50 a.m.-5:30 p.m.

1 stop7h 40m

Montreal Pierre Elliott Trudeau Intl

mer 23/9

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

Nonstop2h 46m

C$ 863

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

ven 25/9

4:59 p.m.-11:57 p.m.

1 stop5h 58m

Montreal Pierre Elliott Trudeau Intl

dom 27/9

7:00 a.m.-1:23 p.m.

1 stop7h 23m

C$ 884

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

dom 13/9

6:45 a.m.-12:16 p.m.

1 stop4h 31m

Montreal Pierre Elliott Trudeau Intl

mer 23/9

2:25 p.m.-8:06 p.m.

1 stop6h 41m

C$ 884

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

ven 18/9

5:43 p.m.-11:44 p.m.

1 stop5h 01m

Montreal Pierre Elliott Trudeau Intl

dom 20/9

7:00 a.m.-1:23 p.m.

1 stop7h 23m

C$ 884

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mar 15/9

10:29 a.m.-4:19 p.m.

1 stop4h 50m

Montreal Pierre Elliott Trudeau Intl

dom 20/9

7:00 a.m.-1:23 p.m.

1 stop7h 23m

C$ 884

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lun 30/11

4:15 p.m.-10:53 p.m.

1 stop5h 38m

Montreal Pierre Elliott Trudeau Intl

mer 2/12

11:10 a.m.-3:30 p.m.

1 stop5h 20m

C$ 887

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lun 31/8

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

1 stop5h 00m

Montreal Pierre Elliott Trudeau Intl

mer 2/9

9:30 a.m.-8:42 p.m.

2 stops12h 12m

C$ 897

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

sab 19/9

8:00 a.m.-7:45 p.m.

2 stops10h 45m

Montreal Pierre Elliott Trudeau Intl

sab 26/9

2:20 p.m.-9:21 p.m.

2 stops8h 01m

C$ 905

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mer 1/7

10:20 a.m.-5:30 p.m.

1 stop6h 10m

Montreal Pierre Elliott Trudeau Intl

mer 8/7

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

Nonstop2h 47m

C$ 905

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/6

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

Best time to book a flight from St. Louis to Pierre Elliott Trudeau Intl

Have a flexible travel schedule? Discover the best time to fly to Pierre Elliott Trudeau Intl from St. Louis 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 St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

What is the cheapest time of day to fly from STL to YUL?

Find hourly flight availability from St. Louis to Pierre Elliott Trudeau Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 14 giugno 2026.

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

How much does it cost to fly round-trip from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Pierre Elliott Trudeau Intl. 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 from for flights from St. Louis to Montreal Pierre Elliott Trudeau Intl?

    For a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 20.4 km from the centre of the city. Lambert-St Louis is the only St. Louis airport and it handles 1 outbound flight to Montreal Pierre Elliott Trudeau Intl per day. 0 airlines have flights to Montreal Pierre Elliott Trudeau Intl from Lambert-St Louis on a regular basis.

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

    For as low as C$ 884, American Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 5h 01m. There are 1556 km between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport. This flight may include one or multiple stops.

  • Can I find deals for flights from St. Louis to Pierre Elliott Trudeau Intl that include hotel bookings?

    Yes. In addition to deals on St. Louis to Pierre Elliott Trudeau Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Pierre Elliott Trudeau Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Pierre Elliott Trudeau Intl.

  • Can I find deals for business class flights from St. Louis to Pierre Elliott Trudeau Intl?

    Yes. Cheapflights offers flight deals from St. Louis to Pierre Elliott Trudeau Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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
Laval
Dorval
Trois-Rivières
Brossard
Sherbrooke
Cornwall
Longueuil
Montebello
Magog
Boucherville
Bromont
Saint-Jean-sur-Richelieu
Drummondville
North Hatley
Saint-Sauveur
Louiseville

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Alternative routes for St. Louis to Pierre Elliott Trudeau Intl

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Pierre Elliott Trudeau Intl flights
Joplin to Pierre Elliott Trudeau Intl flights

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

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

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to Pierre Elliott Trudeau Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to Pierre Elliott Trudeau Intl with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from St. Louis to Pierre Elliott Trudeau Intl flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from St. Louis to Pierre Elliott Trudeau Intl become cheaper?

Yes! Start tracking prices for St. Louis to Pierre Elliott Trudeau Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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