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Cheap flights from Islip, NY to Ontario from C$ 323

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 27/7. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
10 Jun — 17 Jun1
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 11 May 2026.

Thu 4/67:25 a.m.
ISP
-
YUL
1 stop10h 50m
Multiple Airlines
Sun 7/66:45 a.m.
YUL
-
ISP
2 stops27h 20m
Multiple Airlines
Deal found 10/5C$ 914
Tue 23/64:41 p.m.
ISP
-
YYZ
1 stop24h 04m
Multiple Airlines
Tue 30/66:30 a.m.
YYZ
-
ISP
2 stops28h 47m
Multiple Airlines
Deal found 9/5C$ 927
Wed 17/612:30 p.m.
ISP
-
YYZ
2 stops7h 14m
Multiple Airlines
Thu 18/69:50 a.m.
YYZ
-
ISP
1 stop11h 07m
Multiple Airlines
Deal found 7/5C$ 931
Mon 22/69:52 p.m.
ISP
-
YUL
2 stops21h 40m
Multiple Airlines
Mon 29/67:20 p.m.
YUL
-
ISP
1 stop15h 45m
Multiple Airlines
Deal found 8/5C$ 1,009
Fri 12/67:00 a.m.
ISP
-
YUL
1 stop11h 15m
Multiple Airlines
Sun 14/66:45 a.m.
YUL
-
ISP
2 stops14h 12m
Multiple Airlines
Deal found 10/5C$ 1,105
Thu 14/56:46 p.m.
ISP
-
YYZ
2 stops15h 33m
Multiple Airlines
Wed 20/59:50 a.m.
YYZ
-
ISP
1 stop24h 37m
Multiple Airlines
Deal found 8/5C$ 1,130
Sat 30/57:25 a.m.
ISP
-
YYZ
2 stops12h 59m
Multiple Airlines
Sun 31/57:25 a.m.
YYZ
-
ISP
1 stop8h 45m
Multiple Airlines
Deal found 11/5C$ 1,192
Fri 12/67:25 a.m.
ISP
-
YUL
1 stop10h 50m
Multiple Airlines
Mon 15/610:35 a.m.
YUL
-
ISP
2 stops9h 10m
Multiple Airlines
Deal found 7/5C$ 1,317
Sat 23/57:25 a.m.
ISP
-
YUL
1 stop10h 50m
Multiple Airlines
Mon 25/57:20 p.m.
YUL
-
ISP
2 stops38h 45m
Multiple Airlines
Deal found 8/5C$ 1,337
Fri 15/57:25 a.m.
ISP
-
YYZ
1 stop13h 35m
Multiple Airlines
Sun 17/58:00 p.m.
YYZ
-
ISP
1 stop14h 05m
Multiple Airlines
Deal found 11/5C$ 1,363
Fri 14/87:25 a.m.
ISP
-
YYZ
1 stop13h 05m
Multiple Airlines
Sun 16/87:25 a.m.
YYZ
-
ISP
1 stop12h 20m
Multiple Airlines
Deal found 9/5C$ 1,370
Sun 10/511:12 a.m.
ISP
-
YYZ
1 stop27h 08m
Multiple Airlines
Mon 11/54:50 p.m.
YYZ
-
ISP
1 stop18h 10m
Multiple Airlines
Deal found 10/5C$ 1,584

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 11 May 2026.

Round-trip from

C$ 914

One-way from

C$ 323

Popular in

December

Cheapest in

June

Average price

C$ 401
4/6-7/6
  • 4/6-7/6
  • 3 total stops
  • 38h 10m total
  • Islip to Ontario
Search Deals
27/7
  • 27/7
  • 2 total stops
  • 26h 17m total
  • Islip to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 11 May 2026.
Use the filters below to find and compare flights from Islip to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Tue 23/6

4:41 p.m.-4:45 p.m.

1 stop24h 04m

Toronto Pearson Intl

Tue 30/6

6:30 a.m.-11:17 a.m.

2 stops28h 47m

C$ 927

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Wed 17/6

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

1 stop8h 00m

Toronto Pearson Intl

Thu 18/6

7:45 a.m.-8:57 p.m.

1 stop13h 12m

C$ 931

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Mon 22/6

9:52 p.m.-7:32 p.m.

2 stops21h 40m

Montreal Pierre Elliott Trudeau Intl

Mon 29/6

7:20 p.m.-11:05 a.m.

1 stop15h 45m

C$ 1,009

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 12/6

7:00 a.m.-6:15 p.m.

1 stop11h 15m

Montreal Pierre Elliott Trudeau Intl

Sun 14/6

6:45 a.m.-8:57 p.m.

2 stops14h 12m

C$ 1,105

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Thu 4/6

7:25 a.m.-6:15 p.m.

1 stop10h 50m

Montreal Pierre Elliott Trudeau Intl

Sun 7/6

7:20 p.m.-10:56 a.m.

1 stop15h 36m

C$ 1,112

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Sat 30/5

7:25 a.m.-8:24 p.m.

2 stops12h 59m

Toronto Pearson Intl

Sun 31/5

7:25 a.m.-4:10 p.m.

1 stop8h 45m

C$ 1,192
Quickest round-trip

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Fri 12/6

7:25 a.m.-6:15 p.m.

1 stop10h 50m

Montreal Pierre Elliott Trudeau Intl

Mon 15/6

10:35 a.m.-7:45 p.m.

2 stops9h 10m

C$ 1,317

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

Sat 23/5

7:25 a.m.-6:15 p.m.

1 stop10h 50m

Montreal Pierre Elliott Trudeau Intl

Mon 25/5

7:20 p.m.-10:05 a.m.

2 stops38h 45m

C$ 1,337

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Fri 14/8

7:25 a.m.-8:30 p.m.

1 stop13h 05m

Toronto Pearson Intl

Sun 16/8

7:25 a.m.-7:45 p.m.

1 stop12h 20m

C$ 1,370
Cheapest one-way
Quickest one-way

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

Mon 27/7

2:28 p.m.-4:45 p.m.

2 stops26h 17m

C$ 323

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/5

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

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
No data available for this route at this time. Please check back soon.

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.

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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