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Cheap flights from Islip to Montreal Pierre Elliott Trudeau Intl Airport from C$ 636

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 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YUL
17 Oct — 24 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Islip to Pierre Elliott Trudeau Intl

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Pierre Elliott Trudeau Intl (YUL). 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 17 September 2025.

Round-trip from

C$ 636

Popular in

December

Cheapest in

April

Average price

C$ 447
31/10-7/11
  • 31/10-7/11
  • 3 total stops
  • 49h 47m total
  • Islip to Montreal
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Highest demand for flights based on searches. 2% potential increase in price (C$ 15 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease (C$ 7 potential savings vs. average RT price).
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Average for round-trip flights in September 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 17 September 2025.

Fri 31/104:58 p.m.ISP - YUL
2 stops31h 45mMultiple Airlines
Fri 7/114:35 p.m.YUL - ISP
1 stop18h 02mMultiple Airlines
Deal found 16/9C$ 636
Tue 14/107:30 a.m.ISP - YUL
1 stop4h 15mMultiple Airlines
Tue 21/101:05 p.m.YUL - ISP
1 stop6h 40mMultiple Airlines
Deal found 16/9C$ 3,484
Mon 13/1011:53 a.m.ISP - YUL
1 stop8h 07mMultiple Airlines
Mon 20/108:05 a.m.YUL - ISP
1 stop8h 10mMultiple Airlines
Deal found 16/9C$ 3,567

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Pierre Elliott Trudeau Intl 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 17 September 2025.
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

Islip

Fly to

Pierre Elliott Trudeau Intl

Route

Depart

Return

Price

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 31/10

4:58 p.m.-12:43 a.m.

2 stops31h 45m

Montreal Pierre Elliott Trudeau Intl

Fri 7/11

4:35 p.m.-10:37 a.m.

1 stop18h 02m

C$ 636

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Wed 11/2

11:50 a.m.-12:30 a.m.

2 stops12h 40m

Montreal Pierre Elliott Trudeau Intl

Tue 17/2

4:35 p.m.-10:40 a.m.

1 stop18h 05m

C$ 739

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Wed 11/2

11:50 a.m.-12:30 a.m.

2 stops12h 40m

Montreal Pierre Elliott Trudeau Intl

Sun 15/2

4:35 p.m.-10:40 a.m.

1 stop18h 05m

C$ 779

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Wed 11/2

11:50 a.m.-12:30 a.m.

2 stops12h 40m

Montreal Pierre Elliott Trudeau Intl

Mon 16/2

6:45 a.m.-12:31 a.m.

1 stop17h 46m

C$ 807

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 12/2

11:45 a.m.-12:30 a.m.

2 stops12h 45m

Montreal Pierre Elliott Trudeau Intl

Tue 17/2

4:35 p.m.-10:40 a.m.

1 stop18h 05m

C$ 846

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 12/2

11:45 a.m.-12:30 a.m.

2 stops12h 45m

Montreal Pierre Elliott Trudeau Intl

Mon 16/2

8:00 a.m.-12:31 a.m.

1 stop16h 31m

C$ 924

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/9

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 to Montreal Pierre Elliott Trudeau Intl Airport?

Currently, October is the cheapest month in which you can book a flight from Islip to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from Islip to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 316). 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 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?

    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.

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

    Currently, October is the cheapest month in which you can book a flight from Islip to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from Islip to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 316). 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.

See more FAQs

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

Book flights to Montreal Pierre Elliott Trudeau Intl Airport if you plan to visit one of these locations
Laval
Dorval
Sherbrooke
Cornwall
Brossard
Longueuil
Montebello
Trois-Rivières
Drummondville
Saint-Jean-sur-Richelieu
Boucherville
Bromont
North Hatley
Louiseville

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How does Cheapflights help users find flights from Islip to Pierre Elliott Trudeau Intl?

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

Yes, we can. To see specific flights from Islip to Pierre Elliott Trudeau Intl with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Not ready to book yet? You can track prices for flights from Islip to Pierre Elliott Trudeau Intl on Cheapflights with our Price Alert feature and get notified when better prices are available.

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