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Cheap flights from Islip, NY to Ontario from C$ 190

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 16/11. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 30 October 2025.

Mon 1/129:02 a.m.ISP - YYZ
1 stop15h 23mMultiple Airlines
Thu 4/128:30 p.m.YYZ - ISP
2 stops23h 04mMultiple Airlines
Deal found 30/10C$ 468
Fri 14/114:58 p.m.ISP - YYZ
1 stop21h 22mMultiple Airlines
Mon 17/1112:50 p.m.YYZ - ISP
1 stop28h 52mMultiple Airlines
Deal found 28/10C$ 496
Fri 12/126:00 a.m.ISP - YYZ
1 stop15h 19mMultiple Airlines
Fri 19/122:20 p.m.YYZ - ISP
1 stop9h 39mMultiple Airlines
Deal found 28/10C$ 612
Fri 7/114:58 p.m.ISP - YYZ
1 stop21h 22mMultiple Airlines
Mon 10/1112:50 p.m.YYZ - ISP
1 stop28h 52mMultiple Airlines
Deal found 28/10C$ 648
Thu 20/1110:02 a.m.ISP - YUL
2 stops12h 18mMultiple Airlines
Sun 23/114:35 p.m.YUL - ISP
1 stop15h 27mMultiple Airlines
Deal found 28/10C$ 693
Fri 12/128:29 p.m.ISP - YUL
1 stop28h 01mMultiple Airlines
Fri 19/124:35 p.m.YUL - ISP
1 stop25h 20mMultiple Airlines
Deal found 28/10C$ 708
Sun 2/117:30 a.m.ISP - YUL
1 stop12h 35mMultiple Airlines
Tue 4/118:00 p.m.YUL - ISP
1 stop20h 15mMultiple Airlines
Deal found 29/10C$ 3,777

Cheap flight deals from Islip to Ontario

Keep the following information in mind while searching for Islip to Ontario flight deals. Data was last updated 30 October 2025.

Round-trip from

C$ 468

One-way from

C$ 190

Popular in

November

Cheapest in

January

Average price

C$ 438
1/12-4/12
  • 1/12-4/12
  • 3 total stops
  • 38h 27m total
  • Islip to Ontario
Search Deals
16/11
  • 16/11
  • 2 total stops
  • 23h 40m total
  • Islip to Ontario
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 30 October 2025.
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

Mon 1/12

9:02 a.m.-12:25 a.m.

1 stop15h 23m

Toronto Pearson Intl

Thu 4/12

8:30 p.m.-7:34 p.m.

2 stops23h 04m

C$ 468

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 14/11

4:58 p.m.-2:20 p.m.

1 stop21h 22m

Toronto Pearson Intl

Mon 17/11

12:50 p.m.-5:42 p.m.

1 stop28h 52m

C$ 496

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 20/11

10:02 a.m.-10:20 p.m.

2 stops12h 18m

Montreal Pierre Elliott Trudeau Intl

Sun 23/11

4:35 p.m.-8:02 a.m.

1 stop15h 27m

C$ 693

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 12/12

8:29 p.m.-12:30 a.m.

1 stop28h 01m

Montreal Pierre Elliott Trudeau Intl

Fri 19/12

4:35 p.m.-5:55 p.m.

1 stop25h 20m

C$ 708

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sun 16/11

9:27 p.m.-9:07 p.m.

2 stops23h 40m

C$ 190

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 19/11

8:45 p.m.-2:54 p.m.

1 stop18h 09m

C$ 205

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Thu 20/11

10:02 a.m.-12:11 a.m.

1 stop14h 09m

C$ 211

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Tue 18/11

10:38 a.m.-2:54 p.m.

1 stop28h 16m

C$ 228

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 15/11

11:40 a.m.-9:19 p.m.

1 stop9h 39m

C$ 275

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 21/11

11:32 a.m.-2:20 p.m.

1 stop26h 48m

C$ 275

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/10

Showing 1-10 of 11 results
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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$ 117). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of C$ 180). 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$ 117). Flying from Islip, New York to Region of Ontario in December is currently the most expensive (average of C$ 180). 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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