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$ 718+ 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 21 August 2026.

Mon 21/97:00 a.m. -

2 stops12h 32m

Thu 24/96:45 a.m. -

2 stops16h 37m

Deal found 18/8C$ 1,206

Fri 28/810:57 a.m. -

2 stops23h 43m

Mon 31/89:20 a.m. -

1 stop8h 54m

Deal found 17/8C$ 1,248

Thu 1/107:31 a.m. -

2 stops10h 41m

Thu 8/106:30 a.m. -

2 stops11h 11m

Deal found 16/8C$ 1,397

Fri 4/97:05 a.m. -

1 stop10h 55m

Sat 5/97:20 p.m. -

1 stop17h 10m

Deal found 16/8C$ 1,470

Sat 5/99:05 a.m. -

1 stop8h 55m

Mon 7/97:20 p.m. -

1 stop15h 36m

Deal found 19/8C$ 1,503

Fri 2/107:00 a.m. -

2 stops12h 32m

Fri 9/106:45 a.m. -

2 stops14h 50m

Deal found 18/8C$ 1,641

Tue 15/910:05 a.m. -

2 stops11h 07m

Tue 22/96:30 a.m. -

2 stops13h 45m

Deal found 16/8C$ 1,703

Find flight deals from Islip to Pierre Elliott Trudeau Intl

Round-trip from	C$ 1,206
One-way from	C$ 718
Popular in	December
Cheapest in	March
Average price	C$ 487

21/9-24/9
4 total stops
29h 09m total
Islip to Montreal

Search Deals

28/8
3 total stops
27h 47m total
Islip to Montreal

Search Deals

Highest demand for flights based on searches. 2% potential increase in price (C$ 15 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (C$ 7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 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 21/9

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

2 stops12h 32m

Montreal Pierre Elliott Trudeau Intl

Thu 24/9

6:45 a.m.-11:22 p.m.

2 stops16h 37m

C$ 1,206

Quickest round-trip

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Thu 1/10

7:31 a.m.-6:12 p.m.

2 stops10h 41m

Montreal Pierre Elliott Trudeau Intl

Thu 8/10

6:30 a.m.-5:41 p.m.

2 stops11h 11m

C$ 1,397

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Fri 4/9

7:05 a.m.-6:00 p.m.

1 stop10h 55m

Montreal Pierre Elliott Trudeau Intl

Sat 5/9

7:20 p.m.-12:30 p.m.

1 stop17h 10m

C$ 1,470

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Sat 5/9

9:05 a.m.-6:00 p.m.

1 stop8h 55m

Montreal Pierre Elliott Trudeau Intl

Mon 7/9

7:20 p.m.-10:56 a.m.

1 stop15h 36m

C$ 1,503

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Sun 4/10

7:05 a.m.-12:37 a.m.

2 stops17h 32m

Montreal Pierre Elliott Trudeau Intl

Sun 11/10

6:50 p.m.-8:15 p.m.

2 stops25h 25m

C$ 1,581

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Tue 15/9

10:05 a.m.-11:55 a.m.

1 stop25h 50m

Montreal Pierre Elliott Trudeau Intl

Tue 22/9

8:00 p.m.-10:56 a.m.

1 stop14h 56m

C$ 3,687

Cheapest one-way

Quickest one-way

IslipMontreal

ISP Islip Long Island - YUL Montreal Pierre Elliott Trudeau Intl

ISPYUL

Islip Long Island

Fri 28/8

2:28 p.m.-6:15 p.m.

3 stops27h 47m

C$ 718

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/8

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$ 718

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 28/8. 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 21 August 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 21 August 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 21 August 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 21 August 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 21 August 2026 and is based on user searches.

Discover last-minute flight deals from Islip to Pierre Elliott Trudeau Intl. Data last updated 21 August 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 21 August 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 21 August 2026.

Find flight deals from Islip to Pierre Elliott Trudeau Intl

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

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.

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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Complete your trip to Pierre Elliott Trudeau Intl by adding a car rental and/or hotel reservation to your travel itinerary.

Direct flights to Quebec

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Find flights from Islip to Pierre Elliott Trudeau Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Islip and Pierre Elliott Trudeau Intl flights

Browse other Islip and Pierre Elliott Trudeau Intl flight options. Last updated on 21 August 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 21 August 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 21 August 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 21 August 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 21 August 2026.