What is the cheapest month to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport lean towards being more expensive in June. Prices are generally better when you fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in August, with the cheapest ticket starting at C$ 320.

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

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.

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.

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.

C$ 219+ Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Q: How far in advance should I book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

To save on the cost of your flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport, book at least 51 days before your planned departure. Booking around this time can save you about 82% on the cost of this flight compared to booking a flight leaving this week. We have found prices from C$ 659 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as C$ 1,109.

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

Round-trip from	C$ 573
One-way from	C$ 219
Popular in	March
Cheapest in	May
Average price	C$ 860

15/5-22/5
3 total stops
31h 34m total
St. Louis to Montreal

Search Deals

15/5
2 total stops
13h 27m total
St. Louis to Montreal

Search Deals

Highest demand for flights based on searches. 19% potential increase in price (C$ 295 potential increase over avg. RT price).

Search Deals

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 April 2025

Search Deals

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 17 April 2025.

Thu 15/510:10 a.m.STL - YUL

2 stops13h 27mMultiple Airlines

Thu 22/56:45 a.m.YUL - STL

1 stop18h 07mMultiple Airlines

Deal found 17/4C$ 573

Fri 2/51:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Sun 4/56:10 p.m.YUL - STL

Nonstop2h 48mAir Canada

Deal found 16/4C$ 642

Tue 27/56:00 a.m.STL - YUL

1 stop9h 04mDelta

Wed 28/55:00 p.m.YUL - STL

1 stop16h 07mDelta

Deal found 16/4C$ 652

Wed 11/66:04 a.m.STL - YUL

1 stop9h 41mAmerican Airlines

Tue 17/612:30 p.m.YUL - STL

1 stop9h 00mAmerican Airlines

Deal found 16/4C$ 678

Wed 28/58:15 a.m.STL - YUL

1 stop6h 34mUnited Airlines

Wed 28/56:10 p.m.YUL - STL

Nonstop2h 48mUnited Airlines

Deal found 16/4C$ 704

Sat 24/55:17 p.m.STL - YUL

1 stop4h 59mWestJet

Sat 31/56:00 a.m.YUL - STL

1 stop4h 35mWestJet

Deal found 16/4C$ 840

Best flights from St. Louis to Pierre Elliott Trudeau Intl
Discover carefully curated flight deals from St. Louis to Pierre Elliott Trudeau Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 17 April 2025.

Thu 15/510:10 a.m.STL - YUL

2 stops13h 27mMultiple Airlines

Thu 22/56:45 a.m.YUL - STL

1 stop18h 07mMultiple Airlines

Deal found 17/4C$ 573

Fri 2/51:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Sun 4/56:10 p.m.YUL - STL

Nonstop2h 48mAir Canada

Deal found 16/4C$ 642

Tue 27/56:00 a.m.STL - YUL

1 stop9h 04mDelta

Wed 28/55:00 p.m.YUL - STL

1 stop16h 07mDelta

Deal found 16/4C$ 652

Wed 11/66:04 a.m.STL - YUL

1 stop9h 41mAmerican Airlines

Tue 17/612:30 p.m.YUL - STL

1 stop9h 00mAmerican Airlines

Deal found 16/4C$ 678

Wed 28/58:15 a.m.STL - YUL

1 stop6h 34mUnited Airlines

Wed 28/56:10 p.m.YUL - STL

Nonstop2h 48mUnited Airlines

Deal found 16/4C$ 704

Sat 24/55:17 p.m.STL - YUL

1 stop4h 59mWestJet

Sat 31/56:00 a.m.YUL - STL

1 stop4h 35mWestJet

Deal found 16/4C$ 840

Direct flights from St. Louis to Pierre Elliott Trudeau Intl
Explore direct flight options from St. Louis to Pierre Elliott Trudeau Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 17 April 2025.

Fri 2/51:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Sun 4/56:10 p.m.YUL - STL

Nonstop2h 48mAir Canada

Deal found 16/4C$ 642

Thu 18/91:30 p.m.STL - YUL

Nonstop2h 30mUnited Airlines

Tue 23/96:10 p.m.YUL - STL

Nonstop2h 47mUnited Airlines

Deal found 16/4C$ 736

Last-minute flights from St. Louis to Pierre Elliott Trudeau Intl
Discover last-minute flight deals from St. Louis to Pierre Elliott Trudeau Intl. Data last updated 17 April 2025 and is based on user searches.

Thu 24/45:41 p.m.STL - YUL

1 stop19h 29mMultiple Airlines

Sun 27/49:15 a.m.YUL - STL

1 stop9h 00mMultiple Airlines

Deal found 16/4C$ 707

Thu 24/46:30 a.m.STL - YUL

2 stops10h 20mUnited Airlines

Sun 27/48:30 a.m.YUL - STL

2 stops8h 17mUnited Airlines

Deal found 16/4C$ 1,030

Fri 2/51:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Sun 4/56:10 p.m.YUL - STL

Nonstop2h 48mAir Canada

Deal found 16/4C$ 642

Mon 5/57:31 a.m.STL - YUL

1 stop8h 24mAmerican Airlines

Mon 12/512:30 p.m.YUL - STL

1 stop12h 21mAmerican Airlines

Deal found 17/4C$ 681

Thu 15/510:10 a.m.STL - YUL

2 stops13h 27mMultiple Airlines

Thu 22/56:45 a.m.YUL - STL

1 stop18h 07mMultiple Airlines

Deal found 17/4C$ 573

Sat 24/55:17 p.m.STL - YUL

1 stop4h 59mWestJet

Sun 1/66:00 a.m.YUL - STL

1 stop4h 35mWestJet

Deal found 16/4C$ 840

Tue 27/56:00 a.m.STL - YUL

1 stop9h 04mDelta

Wed 28/55:00 p.m.YUL - STL

1 stop16h 07mDelta

Deal found 16/4C$ 652

Wed 28/58:15 a.m.STL - YUL

1 stop6h 34mUnited Airlines

Wed 28/56:10 p.m.YUL - STL

Nonstop2h 48mUnited Airlines

Deal found 16/4C$ 704

One-way flights from St. Louis to Pierre Elliott Trudeau Intl
Search for one-way flight options from St. Louis to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated 17 April 2025.

Thu 15/510:10 a.m.STL - YUL

2 stops13h 27mMultiple Airlines

Deal found 17/4C$ 219

Thu 4/97:23 a.m.STL - YUL

1 stop8h 17mAmerican Airlines

Deal found 16/4C$ 269

Tue 27/56:00 a.m.STL - YUL

1 stop9h 04mDelta

Deal found 17/4C$ 272

Thu 4/91:30 p.m.STL - YUL

Nonstop2h 30mAir Canada

Deal found 16/4C$ 331

Tue 27/55:00 a.m.STL - YUL

2 stops12h 25mUnited Airlines

Deal found 17/4C$ 336

Cheapflights Fare Finder

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

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 15/5

10:10 a.m.-12:37 a.m.

2 stops13h 27m

Montreal Pierre Elliott Trudeau Intl

Thu 22/5

6:45 a.m.-11:52 p.m.

1 stop18h 07m

C$ 573

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 2/5

1:30 p.m.-5:00 p.m.

Nonstop2h 30m

Montreal Pierre Elliott Trudeau Intl

Sun 4/5

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

Nonstop2h 48m

C$ 642

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 27/5

6:00 a.m.-4:04 p.m.

1 stop9h 04m

Montreal Pierre Elliott Trudeau Intl

Wed 28/5

5:00 p.m.-8:07 a.m.

1 stop16h 07m

C$ 652

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 11/6

6:04 a.m.-4:45 p.m.

1 stop9h 41m

Montreal Pierre Elliott Trudeau Intl

Tue 17/6

12:30 p.m.-8:30 p.m.

1 stop9h 00m

C$ 678

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 28/5

8:15 a.m.-3:49 p.m.

1 stop6h 34m

Montreal Pierre Elliott Trudeau Intl

Wed 28/5

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

Nonstop2h 48m

C$ 704

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 24/5

5:17 p.m.-11:16 p.m.

1 stop4h 59m

Montreal Pierre Elliott Trudeau Intl

Sun 1/6

6:00 a.m.-9:35 a.m.

1 stop4h 35m

C$ 840

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 15/5

10:10 a.m.-12:37 a.m.

2 stops13h 27m

C$ 219

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 4/9

7:23 a.m.-4:40 p.m.

1 stop8h 17m

C$ 269

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 27/5

6:00 a.m.-4:04 p.m.

1 stop9h 04m

C$ 272

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 4/9

1:30 p.m.-5:00 p.m.

Nonstop2h 30m

C$ 331

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/4

Showing 1-10 of 11 results

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 July 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

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

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

Delta

8.0

Very good

7,916 reviews

Check prices

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.

Delta

8.0

Very good

7,916 reviews

Delta

8.0

Very good

7,916 reviews

Check prices

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.

United Airlines

7.4

Good

8,667 reviews

Delta

8.0

Very good

7,916 reviews

Check prices

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.

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,916 reviews

Check prices

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.

WestJet

7.2

Good

2,809 reviews

Delta

8.0

Very good

7,916 reviews

Check prices

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.

Air Canada

7.0

Good

9,143 reviews

Delta

8.0

Very good

7,916 reviews

Check prices

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

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 Air Canada. Our recent data shows that you can find tickets from as low as C$ 642 on this airline. Additional options worth looking into are Delta and American Airlines, starting at C$ 652 and C$ 678 round-trip. Air Canada is currently priced 27% 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$ 269), Delta (C$ 272), and Air Canada (C$ 331).
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 July 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

Laval

Brossard

Dorval

Longueuil

Cornwall

Drummondville

Saint-Jean-sur-Richelieu

Sherbrooke

Boucherville

Saint-Sauveur

Bromont

Montebello

Trois-Rivières

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from St. Louis to Pierre Elliott Trudeau Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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?

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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 219

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 15/5. Fares are subject to change and may not be available on all flights or dates of travel.

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

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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

Cheapest flights from St. Louis to Pierre Elliott Trudeau IntlExplore 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 17 April 2025.

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 17 April 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

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.

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?

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.

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.

Reviews of airlines servicing Pierre Elliott Trudeau Intl

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?

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

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

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

How can I 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?

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

Travelling to a place near St. Louis?

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Alternative routes for St. Louis to Pierre Elliott Trudeau Intl

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

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

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

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

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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 17 April 2025.