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$275+ Cheap flights from Islip (ISP) to Ontario

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — YYZ
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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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 septiembre 11, 2025.

Round-trip from

$333
(Kiwi.com)

One-way from

$275
(Kiwi.com)

Popular in

November

Cheapest in

May

Average price

$253
From Islip Long Island to Ontario
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One-way flight from Islip Long Island to Ontario
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Highest demand for flights based on searches. 12% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 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 Ontario

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 septiembre 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/249:49 amISP - YYZ
1 stop11h 32mMultiple Airlines
vie. 10/317:35 amYYZ - ISP
1 stop10h 53mMultiple Airlines
Deal found 9/9$333
This Kiwi.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/269:47 pmISP - YUL
2 stops26h 56mMultiple Airlines
dom. 11/24:35 pmYUL - ISP
1 stop18h 02mMultiple Airlines
Deal found 9/11$424
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/114:58 pmISP - YYZ
2 stops21h 07mMultiple Airlines
mar. 10/149:50 amYYZ - ISP
1 stop10h 52mMultiple Airlines
Deal found 9/10$438
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/911:25 amISP - YYZ
1 stop12h 16mMultiple Airlines
mié. 9/179:50 amYYZ - ISP
1 stop25h 05mMultiple Airlines
Deal found 9/8$494
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/104:58 pmISP - YYZ
1 stop30h 43mMultiple Airlines
dom. 10/197:45 amYYZ - ISP
1 stop25h 19mMultiple Airlines
Deal found 9/10$508
This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/2310:02 amISP - YUL
1 stop14h 28mMultiple Airlines
mié. 11/266:45 amYUL - ISP
2 stops13h 20mMultiple Airlines
Deal found 9/9$540
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/254:58 pmISP - YUL
2 stops31h 45mMultiple Airlines
sáb. 11/14:35 pmYUL - ISP
1 stop29h 07mMultiple Airlines
Deal found 9/10$612
This United deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/1111:53 amISP - YUL
1 stop8h 07mMultiple Airlines
mar. 10/148:05 amYUL - ISP
1 stop5h 19mMultiple Airlines
Deal found 9/10$2,523
This United deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/112:19 pmISP - YUL
2 stops7h 47mMultiple Airlines
sáb. 10/186:00 amYUL - ISP
2 stops9h 21mMultiple Airlines
Deal found 9/11$2,537

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 2,558,603 searches. Data last updated septiembre 11, 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

vie. 10/24

9:49 am-9:21 pm

1 stop11h 32m

Toronto Pearson Intl

vie. 10/31

7:35 am-6:28 pm

1 stop10h 53m

$333

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

dom. 10/26

9:47 pm-12:43 am

2 stops26h 56m

Montreal Pierre Elliott Trudeau Intl

dom. 11/2

4:35 pm-10:37 am

1 stop18h 02m

$424

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

sáb. 10/11

4:58 pm-2:05 pm

2 stops21h 07m

Toronto Pearson Intl

mar. 10/14

9:50 am-8:42 pm

1 stop10h 52m

$438

IslipToronto

ISP - YYZ

ISPYYZ

Islip Long Island

vie. 10/10

4:58 pm-11:41 pm

1 stop30h 43m

Toronto Pearson Intl

dom. 10/19

7:45 am-9:04 am

1 stop25h 19m

$508

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

dom. 11/23

10:02 am-12:30 am

1 stop14h 28m

Montreal Pierre Elliott Trudeau Intl

mié. 11/26

6:45 am-8:05 pm

2 stops13h 20m

$540

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

sáb. 10/25

4:58 pm-12:43 am

2 stops31h 45m

Montreal Pierre Elliott Trudeau Intl

sáb. 11/1

4:35 pm-9:42 pm

1 stop29h 07m

$612

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

sáb. 10/11

11:53 am-8:00 pm

1 stop8h 07m

Montreal Pierre Elliott Trudeau Intl

mar. 10/14

8:05 am-1:24 pm

1 stop5h 19m

$2,523

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

sáb. 10/11

11:53 am-8:00 pm

1 stop8h 07m

Montreal Pierre Elliott Trudeau Intl

sáb. 10/18

1:05 pm-8:01 pm

1 stop6h 56m

$2,523

IslipMontreal

ISP - YUL

ISPYUL

Islip Long Island

jue. 10/2

11:40 am-1:45 pm

3 stops26h 05m

$294

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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 to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Islip to Region of Ontario (average of $243). Flying from Islip to Region of Ontario in August is currently the most expensive (average of $348). 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?

    If you book a flight to Ontario from Islip, you will be flying from Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • What are the most popular routes from Islip to Region of Ontario?

    The most popular flight routes from Islip to Region of Ontario are Islip Long Island - Montreal Pierre Elliott Trudeau Intl, Islip Long Island - Toronto Pearson Intl and Islip Long Island - Ottawa.

  • 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 to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Islip to Region of Ontario (average of $243). Flying from Islip to Region of Ontario in August is currently the most expensive (average of $348). 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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