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Cheap flights from Islip, NY to Ontario from C$ 332

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 13/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
27 Feb — 6 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Islip to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Islip to Ontario
Explore the most affordable flight options available from Islip to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 January 2026.

Fri 13/38:45 p.m.
ISP
-
YYZ
2 stops50h 34m
Multiple Airlines
Fri 20/32:20 p.m.
YYZ
-
ISP
1 stop19h 28m
Multiple Airlines
Deal found 27/1C$ 623
Sat 31/111:50 a.m.
ISP
-
YYZ
2 stops26h 30m
Multiple Airlines
Mon 2/27:10 a.m.
YYZ
-
ISP
1 stop11h 38m
Multiple Airlines
Deal found 27/1C$ 787
Fri 30/12:01 p.m.
ISP
-
YYZ
2 stops24h 19m
Multiple Airlines
Sun 1/28:20 p.m.
YYZ
-
ISP
1 stop22h 28m
Multiple Airlines
Deal found 26/1C$ 798
Thu 12/39:59 a.m.
ISP
-
YUL
3 stops14h 36m
Multiple Airlines
Thu 19/36:50 a.m.
YUL
-
ISP
2 stops11h 54m
Multiple Airlines
Deal found 26/1C$ 1,546

Find flight deals from Islip to Ontario

Keep the following information in mind while searching for Islip to Ontario flight deals. Data was last updated 28 January 2026.

Round-trip from

C$ 623

One-way from

C$ 332

Popular in

December

Cheapest in

May

Average price

C$ 381
13/3-20/3
  • 13/3-20/3
  • 3 total stops
  • 70h 02m total
  • Islip to Ontario
Search Deals
13/3
  • 13/3
  • 1 total stop
  • 10h 48m total
  • Islip to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 75 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Ontario 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 28 January 2026.
Use the filters below to find and compare flights from Islip to Ontario that are best for you.

Fly from

Islip

Fly to

Ontario

Route

Depart

Return

Price

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 13/3

8:45 p.m.-11:19 p.m.

2 stops50h 34m

Toronto Pearson Intl

Fri 20/3

2:20 p.m.-9:48 a.m.

1 stop19h 28m

C$ 623

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 12/3

9:59 a.m.-12:35 a.m.

3 stops14h 36m

Montreal Pierre Elliott Trudeau Intl

Thu 19/3

6:50 a.m.-6:44 p.m.

2 stops11h 54m

C$ 1,546

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 13/3

1:42 p.m.-12:30 a.m.

1 stop10h 48m

C$ 332

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 13/3

1:42 p.m.-12:14 a.m.

1 stop10h 32m

C$ 344

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

Best time to book a flight from Islip to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario 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 Ontario

What is the cheapest month to book a flight from Islip, New York to Region of Ontario?

Currently, May is the cheapest month in which you can book a flight from Islip, New York to Region of Ontario (average of C$ 115). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of C$ 175). 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 Ontario. 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 Ontario?

    Islip Long Island (ISP), located 11.6 km from the city centre, is the airport you fly out of when you book flights from Islip to Ontario.

  • Can I find deals for flights from Islip to Ontario that include hotel bookings?

    Yes. In addition to deals on Islip to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Ontario?

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

  • Can I find deals for business class flights from Islip to Ontario?

    Yes. Cheapflights offers flight deals from Islip to Ontario 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 Region of Ontario?

    Currently, May is the cheapest month in which you can book a flight from Islip, New York to Region of Ontario (average of C$ 115). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of C$ 175). 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

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Alternative routes for Islip to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Fly with Cheapflights

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How does Cheapflights help users find flights from Islip to Ontario?

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