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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 286

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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
2 Apr — 9 Apr1
1 adult

Cheap 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 28 March 2025.

Round-trip from

C$ 509

One-way from

C$ 286

Popular in

February

Cheapest in

May

Average price

C$ 1,111
11/4-14/4
  • 11/4-14/4
  • 2 total stops
  • 56h 38m total
  • St. Louis to Montreal
American Airlines
  • American Airlines
  • 5/6
  • 1 total stop
  • 9h 40m total
  • St. Louis to Montreal
Highest demand for flights based on searches. 18% potential increase in price (C$ 294 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease (C$ 46 potential savings vs. average RT price).
Average for round-trip flights in March 2025

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

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 28 March 2025.

Fri 11/44:57 p.m.STL - YUL
1 stop30h 18mMultiple Airlines
Mon 14/43:55 p.m.YUL - STL
1 stop26h 20mMultiple Airlines
Deal found 26/3C$ 509
Fri 18/46:00 p.m.STL - YUL
1 stop16h 44mAmerican Airlines
Mon 21/412:30 p.m.YUL - STL
1 stop12h 03mAmerican Airlines
Deal found 27/3C$ 646
Thu 1/57:30 a.m.STL - YUL
2 stops6h 48mAir Canada
Sun 4/56:10 p.m.YUL - STL
Nonstop2h 48mAir Canada
Deal found 26/3C$ 687
Thu 24/49:39 a.m.STL - YUL
1 stop8h 12mUnited Airlines
Thu 1/56:15 a.m.YUL - STL
1 stop10h 32mUnited Airlines
Deal found 27/3C$ 728
Thu 10/72:18 p.m.STL - YUL
1 stop7h 51mDelta
Tue 15/76:00 a.m.YUL - STL
1 stop9h 49mDelta
Deal found 26/3C$ 878
Wed 21/53:40 p.m.STL - YUL
2 stops7h 57mWestJet
Fri 30/58:10 a.m.YUL - STL
2 stops40h 28mWestJet
Deal found 26/3C$ 1,009

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 28 March 2025.
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

St. Louis

Fly to

Pierre Elliott Trudeau Intl

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 11/4

4:57 p.m.-12:15 a.m.

1 stop30h 18m

Montreal Pierre Elliott Trudeau Intl

Mon 14/4

3:55 p.m.-5:15 p.m.

1 stop26h 20m

C$ 509

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 18/4

6:00 p.m.-11:44 a.m.

1 stop16h 44m

Montreal Pierre Elliott Trudeau Intl

Mon 21/4

12:30 p.m.-11:33 p.m.

1 stop12h 03m

C$ 646

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 1/5

7:30 a.m.-3:18 p.m.

2 stops6h 48m

Montreal Pierre Elliott Trudeau Intl

Sun 4/5

6:10 p.m.-7:58 p.m.

Nonstop2h 48m

C$ 687

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 24/4

9:39 a.m.-6:51 p.m.

1 stop8h 12m

Montreal Pierre Elliott Trudeau Intl

Thu 1/5

6:15 a.m.-3:47 p.m.

1 stop10h 32m

C$ 728

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 10/7

2:18 p.m.-11:09 p.m.

1 stop7h 51m

Montreal Pierre Elliott Trudeau Intl

Tue 15/7

6:00 a.m.-2:49 p.m.

1 stop9h 49m

C$ 878

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 21/5

3:40 p.m.-12:37 a.m.

2 stops7h 57m

Montreal Pierre Elliott Trudeau Intl

Fri 30/5

8:10 a.m.-11:38 p.m.

2 stops40h 28m

C$ 1,009

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/6

6:00 a.m.-4:40 p.m.

1 stop9h 40m

C$ 286

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 24/4

5:41 p.m.-2:10 p.m.

1 stop19h 29m

C$ 287

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 25/4

5:35 p.m.-1:09 p.m.

2 stops18h 34m

C$ 360

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 4/5

1:30 p.m.-4:59 p.m.

Nonstop2h 29m

C$ 380

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/3

Showing 1-10 of 11 results
1
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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 month to book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Currently, October is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 312). 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.

Rainfall in Pierre Elliott Trudeau Intl by month

Plan your trip to Pierre Elliott Trudeau Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Montreal Pierre Elliott Trudeau Intl Airport ranges from 64.0 - 111.0 mm per month. August is typically the wettest month, when rainfall can reach 111.0 mm. February is typically the driest time to visit Montreal Pierre Elliott Trudeau Intl Airport when rainfall is around 64.0 mm.

Temperature in Pierre Elliott Trudeau Intl by month

Plan your trip to Pierre Elliott Trudeau Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Montreal Pierre Elliott Trudeau Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -9.0 C).

Reviews of airlines servicing Pierre Elliott Trudeau Intl

Get insights into the airlines that provide service to Pierre Elliott Trudeau Intl. 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 Pierre Elliott Trudeau Intl. Reviews last updated 28 March 2025.
Read reviews from past customers who have flown Delta, United Airlines and American Airlines from St. Louis to Montreal. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
8.0
Very good

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Boarding

8.2

Entertainment

7.9

Crew

8.5

Food

7.3

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 0 outbound flights 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.

  • What are the cheapest airlines flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport round-trip?

    Our cheapest airline available from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is American Airlines. Our recent data shows that you can find tickets from as low as C$ 646 on this airline. Additional options worth looking into are Air Canada and United Airlines, starting at C$ 687 and C$ 728 round-trip. American Airlines is currently priced 28% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport one-way?

    The cheapest airlines for a one-way flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport are American Airlines (C$ 286), United Airlines (C$ 360), and Air Canada (C$ 380).

  • 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.

  • What is the cheapest month to book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 312). 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
Laval
Brossard
Dorval
Longueuil
Cornwall
Drummondville
Saint-Jean-sur-Richelieu
Sherbrooke
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Saint-Sauveur
Bromont
Montebello
Trois-Rivières

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Alternative routes for St. Louis to Pierre Elliott Trudeau Intl

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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.

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