In terms of precipitation, rainfall in Montreal Pierre Elliott Trudeau Intl Airport ranges from 2.5 - 4.4 inches per month. August is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Montreal Pierre Elliott Trudeau Intl Airport when rainfall is around 2.5 in.

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 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 15.8 F).

What is the cheapest month to fly from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport?

Our data shows that September tends to be the cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport from Islip, New York. Users have commonly found prices around $311 for the month, but tickets can be as low as $120. Due to multiple factors, prepare for potentially higher prices in December.

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

When flying from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

If you book a flight to Montreal Pierre Elliott Trudeau Intl from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip. There are 0 flights from Long Island to Montreal Pierre Elliott Trudeau Intl per day 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.

$286+ Flights from Islip, NY to Montreal Pierre Elliott Trudeau Intl Airport

Q: How far in advance should I book a flight from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 17 days in advance, which can save you up to 90% on flights from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport compared to booking the week you need them. Waiting 17 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $308. For sooner than that we have options available in the next 3 days from $517.

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Cheap flight deals from Islip to Pierre Elliott Trudeau Intl

Round-trip from	$777 (Mytrip)
One-way from	$286 (Kiwi.com)
Popular in	December
Cheapest in	September
Average price	$316

From Islip Long Island to Montreal Pierre Elliott Trudeau Intl

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One-way flight from Islip Long Island to Montreal Pierre Elliott Trudeau Intl

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Highest demand for flights based on searches. 4% potential increase in price ($14 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

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Find flight deals from Islip to Pierre Elliott Trudeau Intl

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 June 30, 2025.

Thu 8/147:39 pmISP - YUL

3 stops28h 36mMultiple Airlines

Thu 8/216:45 amYUL - ISP

2 stops12h 14mMultiple Airlines

Deal found 6/30

$777

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 June 30, 2025.

Thu 8/147:39 pmISP - YUL

3 stops28h 36mMultiple Airlines

Thu 8/216:45 amYUL - ISP

2 stops12h 14mMultiple Airlines

Deal found 6/30

$777

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 June 30, 2025 and is based on user searches.

Thu 7/37:39 pmISP - YUL

3 stops28h 36mMultiple Airlines

Mon 7/74:45 pmYUL - ISP

2 stops18h 13mMultiple Airlines

Deal found 6/30

$1,162

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 June 30, 2025.

Mon 7/218:38 pmISP - YUL

1 stop17h 42mMultiple Airlines

Deal found 6/30

$286

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

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 8/14

7:39 pm-12:15 am

3 stops28h 36m

Montreal Pierre Elliott Trudeau Intl

Thu 8/21

6:45 am-6:59 pm

2 stops12h 14m

$777

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Mon 7/21

8:38 pm-2:20 pm

1 stop17h 42m

$286

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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.

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 Islip to Montreal Pierre Elliott Trudeau Intl Airport

What is the cheapest month to book a flight from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport?

Currently, January is the cheapest month in which you can book a flight from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport (average of $270). Flying from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport in July is currently the most expensive (average of $409). 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.

Related info for your journey

What airport do you fly from for flights from Islip to Montreal Pierre Elliott Trudeau Intl?
If you book a flight to Montreal Pierre Elliott Trudeau Intl from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip. There are 0 flights from Long Island to Montreal Pierre Elliott Trudeau Intl per day 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.
What is the cheapest month to book a flight from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport?
Currently, January is the cheapest month in which you can book a flight from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport (average of $270). Flying from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport in July is currently the most expensive (average of $409). 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.

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$286+ Cheap flights from Islip, NY (ISP) to Pierre Elliott Trudeau Intl (YUL)

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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Pierre Elliott Trudeau Intl with Cheapflights

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Cheap flight deals from Islip to Pierre Elliott Trudeau Intl

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Find 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 June 30, 2025.

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 June 30, 2025.

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.

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.

Cheapflights Insights

Everything you need to know about your flight from Islip to Montreal Pierre Elliott Trudeau Intl Airport

What is the cheapest month to book a flight from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from Islip 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 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?

What is the cheapest month to book a flight from Islip, New York to Montreal Pierre Elliott Trudeau Intl Airport?

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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 June 30, 2025.