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.

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).

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

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

What airport do you fly from for flights from Islip to Montreal Pierre Elliott Trudeau Intl?

Located just 11.6 km from the city centre, Islip Long Island is the airport most travellers will use when flying to Montreal Pierre Elliott Trudeau Intl from Islip. Booking flights from Long Island (ISP) to Montreal Pierre Elliott Trudeau Intl should be relatively easy as there are 0 daily outbound flights to Montreal Pierre Elliott Trudeau Intl from 0 different airlines.

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

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

How can I find direct flights from Islip 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 Islip to Pierre Elliott Trudeau Intl.

Can I find deals for business class flights from Islip to Pierre Elliott Trudeau Intl?

Yes. Cheapflights offers flight deals from Islip 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$ 624+ Cheap Flights from Islip, NY to Montreal Pierre Elliott Trudeau Intl Airport

Cheap flight deals from Islip to Pierre Elliott Trudeau Intl

Enter your travel dates to find the best prices.

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One-way

Cheapest flights from Islip to Pierre Elliott Trudeau Intl
Explore the most affordable flight options available from Islip to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 October 2026.

Tue 17/116:00 a.m. -

2 stops13h 15m

Tue 24/116:45 a.m. -

2 stops15h 54m

Deal found 3/10C$ 1,457

Thu 19/116:00 a.m. -

2 stops13h 15m

Thu 26/116:45 a.m. -

2 stops15h 55m

Deal found 5/10C$ 1,584

Sat 19/126:20 p.m. -

1 stop22h 05m

Mon 21/125:25 p.m. -

2 stops16h 27m

Deal found 4/10C$ 2,165

Thu 24/126:20 p.m. -

1 stop22h 05m

Mon 28/125:25 p.m. -

2 stops16h 27m

Deal found 4/10C$ 2,252

Mon 16/116:00 a.m. -

2 stops13h 15m

Mon 23/116:45 a.m. -

2 stops15h 55m

Deal found 2/10C$ 2,387

Find flight deals from Islip to Pierre Elliott Trudeau Intl

Round-trip from	C$ 1,457
One-way from	C$ 624
Popular in	December
Cheapest in	March
Average price	C$ 497

17/11-24/11
4 total stops
29h 09m total
Islip to Montreal

Search Deals

15/2-31/12
2 total stops
29h 12m total
Islip to Montreal

Search Deals

Highest demand for flights based on searches. 3% potential increase in price (C$ 28 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (C$ 9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 2026

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Mon 15/2

11:13 a.m.-4:25 p.m.

2 stops29h 12m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 624

Quickest round-trip

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Thu 22/10

6:00 a.m.-5:07 p.m.

2 stops11h 07m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 725

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Fri 23/10

6:00 a.m.-7:32 p.m.

2 stops13h 32m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 725

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Tue 17/11

6:00 a.m.-7:15 p.m.

2 stops13h 15m

Montreal Pierre Elliott Trudeau Intl

Tue 24/11

6:45 a.m.-10:39 p.m.

2 stops15h 54m

C$ 1,457

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Thu 19/11

6:00 a.m.-7:15 p.m.

2 stops13h 15m

Montreal Pierre Elliott Trudeau Intl

Thu 26/11

6:45 a.m.-10:40 p.m.

2 stops15h 55m

C$ 1,584

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Sat 19/12

6:20 p.m.-4:25 p.m.

1 stop22h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 21/12

5:25 p.m.-9:52 a.m.

2 stops16h 27m

C$ 2,165

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Thu 24/12

6:20 p.m.-4:25 p.m.

1 stop22h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 28/12

5:25 p.m.-9:52 a.m.

2 stops16h 27m

C$ 2,252

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Mon 16/11

6:00 a.m.-7:15 p.m.

2 stops13h 15m

Montreal Pierre Elliott Trudeau Intl

Mon 23/11

6:45 a.m.-10:40 p.m.

2 stops15h 55m

C$ 2,387

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Sat 13/2

5:50 a.m.-4:25 p.m.

1 stop10h 35m

Montreal Pierre Elliott Trudeau Intl

Fri 19/2

8:00 a.m.-9:32 p.m.

1 stop13h 32m

C$ 2,903

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Sorted by cheapest first

Best time to book a flight from Islip to Pierre Elliott Trudeau Intl

Have a flexible travel schedule? Discover the best time to fly to Pierre Elliott Trudeau Intl from Islip with our price prediction graph.

ISP-YUL

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.

Related info for your journey

What airport do you fly from for flights from Islip to Montreal Pierre Elliott Trudeau Intl?
Located just 11.6 km from the city centre, Islip Long Island is the airport most travellers will use when flying to Montreal Pierre Elliott Trudeau Intl from Islip. Booking flights from Long Island (ISP) to Montreal Pierre Elliott Trudeau Intl should be relatively easy as there are 0 daily outbound flights to Montreal Pierre Elliott Trudeau Intl from 0 different airlines.
Can I find deals for flights from Islip to Pierre Elliott Trudeau Intl that include hotel bookings?
Yes. In addition to deals on Islip to Pierre Elliott Trudeau Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip 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 Islip to Pierre Elliott Trudeau Intl.
Can I find deals for business class flights from Islip to Pierre Elliott Trudeau Intl?
Yes. Cheapflights offers flight deals from Islip 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

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Cheapflights makes it easy to find Islip to Pierre Elliott Trudeau Intl 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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Cheap flights from Islip, NY to Montreal Pierre Elliott Trudeau Intl Airport from C$ 624

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/2. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Islip to Pierre Elliott Trudeau Intl

Cheapest flights from Islip to Pierre Elliott Trudeau IntlExplore the most affordable flight options available from Islip to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 October 2026.

Explore the most affordable flight options available from Islip to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 October 2026.

Best flights from Islip to Pierre Elliott Trudeau IntlDiscover carefully curated flight deals from Islip 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 7 October 2026.

Discover carefully curated flight deals from Islip 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 7 October 2026.

Last-minute flights from Islip to Pierre Elliott Trudeau IntlDiscover last-minute flight deals from Islip to Pierre Elliott Trudeau Intl. Data last updated 7 October 2026 and is based on user searches.

Discover last-minute flight deals from Islip to Pierre Elliott Trudeau Intl. Data last updated 7 October 2026 and is based on user searches.

One-way flights from Islip to Pierre Elliott Trudeau IntlSearch for one-way flight options from Islip to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated 7 October 2026.

Search for one-way flight options from Islip to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated 7 October 2026.

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Best time to book a flight from Islip to Pierre Elliott Trudeau Intl

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Related info for your journey

What airport do you fly from for flights from Islip to Montreal Pierre Elliott Trudeau Intl?

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

How can I find direct flights from Islip to Pierre Elliott Trudeau Intl?

Can I find deals for business class flights from Islip to Pierre Elliott Trudeau Intl?

Travelling to a place near Montreal Pierre Elliott Trudeau Intl Airport?

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Alternative routes for Islip to Pierre Elliott Trudeau Intl

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Islip and Pierre Elliott Trudeau Intl flights

Browse other Islip and Pierre Elliott Trudeau Intl flight options. Last updated on 7 October 2026.

Other flights to Pierre Elliott Trudeau Intl

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Can Cheapflights find flights from Islip to Pierre Elliott Trudeau Intl with no change fees?

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

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Cheapest flights from Islip to Pierre Elliott Trudeau Intl
Explore the most affordable flight options available from Islip to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 October 2026.

Best flights from Islip to Pierre Elliott Trudeau Intl
Discover carefully curated flight deals from Islip 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 7 October 2026.

Last-minute flights from Islip to Pierre Elliott Trudeau Intl
Discover last-minute flight deals from Islip to Pierre Elliott Trudeau Intl. Data last updated 7 October 2026 and is based on user searches.

One-way flights from Islip to Pierre Elliott Trudeau Intl
Search for one-way flight options from Islip to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated 7 October 2026.