$426 Cheap Flights from Islip (ISP) to Montreal (YUL)

View $426 flight on Fri, Sep 5, 2025Opens in a new window

Popular airlines from MacArthur Airport (ISP) to Montreal–Trudeau Intl. Airport (YUL)

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Cheap Flights from Islip to Montreal (ISP-YUL)

Prices were available within the past 7 days and start at $426 for one-way flights and $947 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Cape Air
Tue, Sep 16 - Tue, Sep 30
ISP
Islip
YUL
Montreal
$947 Roundtrip, found 2 days ago
$947
Roundtrip
found 2 days ago
Select Cape Air flight, departing Tue, Sep 16 from Islip to Montreal, returning Tue, Sep 30, priced at $947 found 2 days ago
Cape Air
Thu, Nov 13 - Mon, Nov 17
ISP
Islip
YUL
Montreal
$957 Roundtrip, just found
$957
Roundtrip
just found
Select Cape Air flight, departing Thu, Nov 13 from Islip to Montreal, returning Mon, Nov 17, priced at $957 just found
Cape Air
Tue, Sep 9 - Tue, Sep 23
ISP
Islip
YUL
Montreal
$968 Roundtrip, found 2 days ago
$968
Roundtrip
found 2 days ago
Select Cape Air flight, departing Tue, Sep 9 from Islip to Montreal, returning Tue, Sep 23, priced at $968 found 2 days ago
Cape Air
Tue, Oct 7 - Wed, Oct 22
ISP
Islip
YUL
Montreal
$975 Roundtrip, found 4 days ago
$975
Roundtrip
found 4 days ago
Select Cape Air flight, departing Tue, Oct 7 from Islip to Montreal, returning Wed, Oct 22, priced at $975 found 4 days ago
Cape Air
Thu, Sep 18 - Tue, Sep 30
ISP
Islip
YUL
Montreal
$987 Roundtrip, found 2 days ago
$987
Roundtrip
found 2 days ago
Select Cape Air flight, departing Thu, Sep 18 from Islip to Montreal, returning Tue, Sep 30, priced at $987 found 2 days ago
Cape Air
Sat, Oct 25 - Tue, Nov 4
ISP
Islip
YUL
Montreal
$990 Roundtrip, found 2 days ago
$990
Roundtrip
found 2 days ago
Select Cape Air flight, departing Sat, Oct 25 from Islip to Montreal, returning Tue, Nov 4, priced at $990 found 2 days ago
Cape Air
Tue, Aug 26 - Tue, Sep 2
ISP
Islip
YUL
Montreal
$991 Roundtrip, found 5 days ago
$991
Roundtrip
found 5 days ago
Select Cape Air flight, departing Tue, Aug 26 from Islip to Montreal, returning Tue, Sep 2, priced at $991 found 5 days ago
Cape Air
Fri, Sep 5 - Fri, Sep 19
ISP
Islip
YUL
Montreal
$996 Roundtrip, found 2 days ago
$996
Roundtrip
found 2 days ago
Select Cape Air flight, departing Fri, Sep 5 from Islip to Montreal, returning Fri, Sep 19, priced at $996 found 2 days ago
Cape Air
Thu, Oct 2 - Wed, Oct 22
ISP
Islip
YUL
Montreal
$1,003 Roundtrip, found 5 days ago
$1,003
Roundtrip
found 5 days ago
Select Cape Air flight, departing Thu, Oct 2 from Islip to Montreal, returning Wed, Oct 22, priced at $1,003 found 5 days ago
Cape Air
Wed, Oct 8 - Tue, Oct 21
ISP
Islip
YUL
Montreal
$1,007 Roundtrip, found 2 days ago
$1,007
Roundtrip
found 2 days ago
Select Cape Air flight, departing Wed, Oct 8 from Islip to Montreal, returning Tue, Oct 21, priced at $1,007 found 2 days ago

Alternative airports near Montreal

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Pierre Elliott Trudeau Intl. YUL. Cheapest and Closest option available. Average driving time to city center is 17 minutes. Flights from $988
YUL
Pierre Elliott Trudeau Intl.
CheapestClosest
Average driving time to city center17 min
Flights from $988
Flights from Islip (ISP) to Montreal (YUL)
Origin airport
MacArthur
Destination airport
Pierre Elliott Trudeau Intl.
Roundtrip price
$946
Distance
324 mi

Islip to Montreal Flights

The cheapest times to fly from Islip to Montreal

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Islip to Montreal are during the month of September. You can find some of the cheapest flights from Islip to Montreal with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Islip to Montreal

Sunday is one of the best days to book for cheap flights from Islip to Montreal: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Islip to Montreal

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Islip to Montreal in 2025. You can also book with separate airlines for your outbound and return journeys, from $426 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Islip to Montreal flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Islip to Montreal airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL) cost?
Lock in a cheap one-way flight from $426 or cheap return flight from $947 from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL)?
September is the cheapest month to fly from ISP to YUL. Timing your trip outside of the busy season is often the key to landing a great deal.
Which airlines fly direct from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL)?
While Islip, NY (ISP-MacArthur) doesn't have any direct flights to Pierre Elliott Trudeau Intl. Airport (YUL), other airports have nonstop options. Jetting off from John F. Kennedy Intl. Airport (JFK) will get you to Montreal without any layovers.
What is the cheapest airline that flies from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from ISP to YUL. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL)?
There are no daily nonstop flights available from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL). But you can book flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way before you know it.
What day of the week has the most flights from ISP to YUL?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on various factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL)?
To avoid potential delays on the MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL) route, travel before 3 PM. Later departures are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL) last-minute?
Holding off until just before your departure to book your flight from ISP to YUL generally means paying more. While you may find some last-minute discounts, they're not always guaranteed. Allow some flexibility in your schedule to maximize your chances of getting a bargain.
Is it cheaper to book an ISP to YUL flight and hotel package?
Booking an ISP to YUL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our wide range of hotels and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from MacArthur Airport (ISP) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Typically, it's possible to cancel or reschedule your ISP to YUL flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.