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Cheap flights from Ontario to New York from $159

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to New York departing on 5/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to New York

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
9:55 pm - 11:40 am
ONT
-
ISP
10h 45m
1 stop
Southwest Logo
4:40 pm - 9:40 pm
ISP
-
ONT
8h 00m
1 stop
$412Southwest
Thu, Mar 19 - Wed, Mar 25
Southwest Logo
9:55 pm - 11:40 am
ONT
-
ISP
10h 45m
1 stop
Southwest Logo
12:20 pm - 9:50 pm
ISP
-
ONT
12h 30m
2 stops
$418Southwest
Thu, Mar 19 - Wed, Mar 25
Southwest Logo
11:55 pm - 11:40 am
ONT
-
ISP
8h 45m
2 stops
Southwest Logo
12:20 pm - 9:50 pm
ISP
-
ONT
12h 30m
2 stops
$446Southwest
Thu, Mar 19 - Wed, Mar 25
Southwest Logo
6:00 am - 5:00 pm
ONT
-
ISP
8h 00m
2 stops
Southwest Logo
12:40 pm - 9:05 pm
ISP
-
ONT
11h 25m
2 stops
$577Southwest
Fri, Feb 27 - Tue, Mar 3

Southwest flights from Ontario to Islip, New York

Our best Southwest deals on Ontario to Islip, New York flight tickets
Southwest
Mar 19
ONT9:55 pmOntario
10h 45m
1 stop
ISP11:40 amIslip Long Island
Mar 25
ISP4:40 pmIslip Long Island
8h 00m
1 stop
ONT9:40 pmOntario
$412
Southwest
Mar 19
ONT9:55 pmOntario
10h 45m
1 stop
ISP11:40 amIslip Long Island
Mar 25
ISP12:20 pmIslip Long Island
12h 30m
2 stops
ONT9:50 pmOntario
$418
Southwest
Mar 19
ONT11:55 pmOntario
8h 45m
2 stops
ISP11:40 amIslip Long Island
Mar 25
ISP12:20 pmIslip Long Island
12h 30m
2 stops
ONT9:50 pmOntario
$446

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Islip, New York 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, momondo users made 832,500 searches. Data last updated February 16, 2026.
Use the filters below to find and compare flights from Ontario to Islip, New York that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioIslip

ONT - ISP

ONTISP

Ontario

Thu 3/19

9:55 pm-11:40 am

1 stop10h 45m

Islip Long Island

Wed 3/25

4:40 pm-9:40 pm

1 stop8h 00m

$412

OntarioIslip

ONT - ISP

ONTISP

Ontario

Thu 3/19

9:55 pm-11:40 am

1 stop10h 45m

Islip Long Island

Wed 3/25

12:20 pm-9:50 pm

2 stops12h 30m

$418

OntarioIslip

ONT - ISP

ONTISP

Ontario

Thu 3/19

11:55 pm-11:40 am

2 stops8h 45m

Islip Long Island

Wed 3/25

12:20 pm-9:50 pm

2 stops12h 30m

$446

OntarioIslip

ONT - ISP

ONTISP

Ontario

Fri 2/27

6:00 am-5:00 pm

2 stops8h 00m

Islip Long Island

Tue 3/3

12:40 pm-9:05 pm

2 stops11h 25m

$577

OntarioIslip

ONT - ISP

ONTISP

Ontario

Fri 5/8

8:26 am-9:13 am

2 stops45h 47m

$159

OntarioIslip

ONT - ISP

ONTISP

Ontario

Thu 4/16

8:59 pm-2:55 pm

2 stops14h 56m

$167

OntarioIslip

ONT - ISP

ONTISP

Ontario

Fri 5/8

8:59 pm-9:13 am

3 stops33h 14m

$180

OntarioIslip

ONT - ISP

ONTISP

Ontario

Mon 5/11

5:33 pm-11:17 am

3 stops38h 44m

$181

OntarioIslip

ONT - ISP

ONTISP

Ontario

Mon 5/11

5:33 pm-11:17 am

2 stops38h 44m

$201

OntarioIslip

ONT - ISP

ONTISP

Ontario

Mon 5/11

9:55 pm-1:50 pm

1 stop12h 55m

$202

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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See travel insights to New York from

How to get the cheapest flight ticket from Ontario to Islip, New York

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Ontario to Islip Long Island?

Southwest is the most popular carrier operating from Ontario to Islip Long Island

What airlines fly to Islip, New York?

JetBlue, United Airlines and American Airlines are the top three most popular airlines that fly to Islip, New York from Ontario according to our data. JetBlue is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Islip, New York. Keep in mind that there are 10 different airlines that fly to Islip, New York on a routine basis, so you have a few additional options to choose from.

When to book flights from Ontario to Islip, New York

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Islip, New York according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Islip, New York (ONT to ISP) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Islip, New York

Fastest flight time

8h 00m

Direct flights

None
The fastest flight from Ontario to Islip, New York takes 8h 00m
There are no direct flights from Ontario to Islip, New York. There are no popular flight routes from Ontario to Islip, New York.
Search flight deals

  • How far is Ontario to Islip Long Island by plane?

    Ontario and Islip Long Island are 2454.1 mi apart from one another. Flights usually cover this in 8h 00m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Ontario Airport to Islip Long Island Airport?

    Prices for flights from Ontario Airport to Islip Long Island Airport were last updated today.

  • How old do you have to be to fly from Ontario Airport to Islip Long Island Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Islip Long Island Airport.

  • What documentation or ID do you need to fly to Islip Long Island Airport?

    The travel and health documents required for your trip to Islip Long Island Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Islip Long Island Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near New York?

Book flights to New York if you plan to visit one of these locations
Montauk
Riverhead
Sag Harbor
Southampton
Amagansett

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Islip?

It is quick and easy to find Ontario to Islip flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Islip that suits you.

Can I find flights from Ontario to Islip with flexible booking policies on momondo?

momondo does allow users to show only those flights to Islip from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to Islip?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Islip from Ontario.

I’m not ready to book a flight from Ontario to Islip right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Islip flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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