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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to Islip, NY from C$ 903

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 23/12. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — ISP
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Pierre Elliott Trudeau Intl to Islip

Enter your travel dates to find the best prices.

Cheapest flights from Pierre Elliott Trudeau Intl to Islip
Explore the most affordable flight options available from Pierre Elliott Trudeau Intl to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 December 2025.

Tue 23/125:10 p.m.YUL - ISP
2 stops26h 31mMultiple Airlines
Tue 13/112:45 p.m.ISP - YUL
1 stop26h 09mMultiple Airlines
Deal found 9/12C$ 903
Fri 26/123:55 p.m.YUL - ISP
1 stop25h 19mMultiple Airlines
Sat 3/17:25 a.m.ISP - YUL
2 stops29h 35mMultiple Airlines
Deal found 10/12C$ 1,776

Find flight deals from Pierre Elliott Trudeau Intl to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Pierre Elliott Trudeau Intl (YUL) to Islip (ISP). 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 12 December 2025.

Round-trip from

C$ 903

Popular in

December

Cheapest in

July

Average price

C$ 452
23/12-13/1
  • 23/12-13/1
  • 3 total stops
  • 52h 40m total
  • Montreal to Islip
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Highest demand for flights based on searches. 6% potential increase in price (C$ 32 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 12 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Pierre Elliott Trudeau Intl to Islip 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 12 December 2025.
Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to Islip that are best for you.

Fly from

Pierre Elliott Trudeau Intl

Fly to

Islip

Route

Depart

Return

Price

MontrealIslip

YUL - ISP

YULISP

Montreal Pierre Elliott Trudeau Intl

Tue 23/12

5:10 p.m.-7:41 p.m.

2 stops26h 31m

Islip Long Island

Tue 13/1

12:45 p.m.-2:54 p.m.

1 stop26h 09m

C$ 903

MontrealIslip

YUL - ISP

YULISP

Montreal Pierre Elliott Trudeau Intl

Fri 26/12

3:55 p.m.-5:14 p.m.

1 stop25h 19m

Islip Long Island

Sat 3/1

7:25 a.m.-1:00 p.m.

2 stops29h 35m

C$ 1,776

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

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

Have a flexible travel schedule? Discover the best time to fly to Islip from Pierre Elliott Trudeau Intl 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 Montreal Pierre Elliott Trudeau Intl Airport to Islip

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

Currently, June is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Islip, New York (average of C$ 182). Flying from Montreal Pierre Elliott Trudeau Intl Airport to Islip, New York in November is currently the most expensive (average of C$ 277). 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

Find useful and relevant information for your journey from Pierre Elliott Trudeau Intl to Islip. 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 into for flights to Islip from Montreal Pierre Elliott Trudeau Intl?

    Most people fly into Islip Long Island (ISP) if they book a flight to Islip from Montreal Pierre Elliott Trudeau Intl. On average, Long Island has 0 inbound flights from Montreal Pierre Elliott Trudeau Intl per day from 0 airlines. Islip Long Island is conveniently located just 11.6 km from Islip’s city centre.

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

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

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Pierre Elliott Trudeau Intl to Islip.

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

    Yes. Cheapflights offers flight deals from Pierre Elliott Trudeau Intl to Islip 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 Montreal Pierre Elliott Trudeau Intl Airport to Islip, New York?

    Currently, June is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Islip, New York (average of C$ 182). Flying from Montreal Pierre Elliott Trudeau Intl Airport to Islip, New York in November is currently the most expensive (average of C$ 277). 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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Can Cheapflights find flights from Pierre Elliott Trudeau Intl to Islip with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Pierre Elliott Trudeau Intl to Islip, users can toggle the no change fees filter when performing a flight search.

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

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