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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to Islip, NY from C$ 1,168

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 21/8. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — ISP
26 Aug — 2 Sep1
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 27 July 2026.

Fri 21/87:20 p.m.
YUL
-
ISP
1 stop15h 10m
Multiple Airlines
Mon 24/87:09 p.m.
ISP
-
YUL
2 stops18h 59m
Multiple Airlines
Deal found 22/7C$ 1,168

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 27 July 2026.

Round-trip from

C$ 1,168

Popular in

July

Cheapest in

October

Average price

C$ 462
21/8-24/8
  • 21/8-24/8
  • 3 total stops
  • 34h 09m total
  • Montreal to Islip
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Highest demand for flights based on searches. 3% potential increase in price (C$ 21 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 9 potential savings vs. average RT price).
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Average for round-trip flights in July 2026
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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 27 July 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

MontrealIslip

YUL - ISP

YULISP

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

7:20 p.m.-10:30 a.m.

1 stop15h 10m

Islip Long Island

Mon 24/8

7:09 p.m.-2:08 p.m.

2 stops18h 59m

C$ 1,168

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/7

Sorted by cheapest first

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.

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.

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

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

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