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Cheap flights from Ontario to New York from $148

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 6/8. 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
9:40 pm - 11:35 am
ONT
-
ISP
10h 55m
1 stop
Southwest Logo
12:30 pm - 8:05 pm
ISP
-
ONT
10h 35m
2 stops
$529Southwest
ج, يوليو 31 - ن, أغسطس 3
Southwest Logo
9:40 pm - 11:35 am
ONT
-
ISP
10h 55m
1 stop
Southwest Logo
5:50 pm - 10:25 pm
ISP
-
ONT
7h 35m
1 stop
$532Southwest
ج, يوليو 31 - ن, أغسطس 3
Southwest Logo
11:55 pm - 2:50 pm
ONT
-
ISP
11h 55m
2 stops
Southwest Logo
12:30 pm - 8:05 pm
ISP
-
ONT
10h 35m
2 stops
$538Southwest
ج, يوليو 31 - ن, أغسطس 3
Southwest Logo
8:10 am - 11:30 pm
ONT
-
ISP
12h 20m
2 stops
Southwest Logo
8:35 am - 3:15 pm
ISP
-
ONT
9h 40m
1 stop
$544Southwest
خ, أبريل 30 - ن, مايو 4
Southwest Logo
8:10 am - 11:30 pm
ONT
-
ISP
12h 20m
2 stops
Southwest Logo
4:30 pm - 11:05 pm
ISP
-
ONT
9h 35m
2 stops
$549Southwest
خ, أبريل 30 - ن, مايو 4
Southwest Logo
6:30 pm - 8:20 am
ONT
-
ISP
10h 50m
2 stops
Southwest Logo
2:55 pm - 11:40 pm
ISP
-
ONT
11h 45m
2 stops
$564Southwest
خ, يوليو 30 - ح, أغسطس 2
Southwest Logo
9:40 pm - 11:35 am
ONT
-
ISP
10h 55m
1 stop
Southwest Logo
6:00 am - 3:55 pm
ISP
-
ONT
12h 55m
1 stop
$565Southwest
ج, يوليو 31 - ح, أغسطس 2
Southwest Logo
11:55 pm - 2:50 pm
ONT
-
ISP
11h 55m
2 stops
Southwest Logo
2:55 pm - 11:40 pm
ISP
-
ONT
11h 45m
2 stops
$574Southwest
ج, يوليو 31 - ح, أغسطس 2
Southwest Logo
9:40 pm - 8:20 am
ONT
-
ISP
7h 40m
1 stop
Southwest Logo
6:00 am - 3:55 pm
ISP
-
ONT
12h 55m
1 stop
$581Southwest
خ, يوليو 30 - ح, أغسطس 2
Southwest Logo
9:55 pm - 11:50 am
ONT
-
ISP
10h 55m
1 stop
Southwest Logo
6:05 am - 3:10 pm
ISP
-
ONT
12h 05m
1 stop
$598Southwest
ر, أبريل 22 - ح, أبريل 26

Southwest flights from Ontario to Islip, New York

Our best Southwest deals on Ontario to Islip, New York flight tickets
Southwest
Jul 31
ONT9:40 pmOntario
10h 55m
1 stop
ISP11:35 amIslip Long Island
Aug 3
ISP12:30 pmIslip Long Island
10h 35m
2 stops
ONT8:05 pmOntario
$529
Southwest
Jul 31
ONT9:40 pmOntario
10h 55m
1 stop
ISP11:35 amIslip Long Island
Aug 3
ISP5:50 pmIslip Long Island
7h 35m
1 stop
ONT10:25 pmOntario
$532
Southwest
Jul 31
ONT11:55 pmOntario
11h 55m
2 stops
ISP2:50 pmIslip Long Island
Aug 3
ISP12:30 pmIslip Long Island
10h 35m
2 stops
ONT8:05 pmOntario
$538

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 أبريل 9, 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

Cheapest round-trip

OntarioIslip

ONT - ISP

ONTISP

Ontario

ج 7/31

9:40 pm-11:35 am

1 stop10h 55m

Islip Long Island

ن 8/3

12:30 pm-8:05 pm

2 stops10h 35m

$529
Quickest round-trip

OntarioIslip

ONT - ISP

ONTISP

Ontario

ج 7/31

9:40 pm-11:35 am

1 stop10h 55m

Islip Long Island

ن 8/3

5:50 pm-10:25 pm

1 stop7h 35m

$532

OntarioIslip

ONT - ISP

ONTISP

Ontario

ج 7/31

11:55 pm-2:50 pm

2 stops11h 55m

Islip Long Island

ن 8/3

12:30 pm-8:05 pm

2 stops10h 35m

$538

OntarioIslip

ONT - ISP

ONTISP

Ontario

خ 4/30

8:10 am-11:30 pm

2 stops12h 20m

Islip Long Island

ن 5/4

8:35 am-3:15 pm

1 stop9h 40m

$544

OntarioIslip

ONT - ISP

ONTISP

Ontario

خ 4/30

8:10 am-11:30 pm

2 stops12h 20m

Islip Long Island

ن 5/4

4:30 pm-11:05 pm

2 stops9h 35m

$549

OntarioIslip

ONT - ISP

ONTISP

Ontario

خ 7/30

6:30 pm-8:20 am

2 stops10h 50m

Islip Long Island

ح 8/2

2:55 pm-11:40 pm

2 stops11h 45m

$564

OntarioIslip

ONT - ISP

ONTISP

Ontario

ج 7/31

9:40 pm-11:35 am

1 stop10h 55m

Islip Long Island

ح 8/2

6:00 am-3:55 pm

1 stop12h 55m

$565

OntarioIslip

ONT - ISP

ONTISP

Ontario

ج 7/31

11:55 pm-2:50 pm

2 stops11h 55m

Islip Long Island

ح 8/2

2:55 pm-11:40 pm

2 stops11h 45m

$574

OntarioIslip

ONT - ISP

ONTISP

Ontario

خ 7/30

9:40 pm-8:20 am

1 stop7h 40m

Islip Long Island

ح 8/2

6:00 am-3:55 pm

1 stop12h 55m

$581

OntarioIslip

ONT - ISP

ONTISP

Ontario

ر 4/22

9:55 pm-11:50 am

1 stop10h 55m

Islip Long Island

ح 4/26

6:05 am-3:10 pm

1 stop12h 05m

$598

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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?

Frontier 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 38% 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

10h 55m

Direct flights

None
The fastest flight from Ontario to Islip, New York takes 10h 55m
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

Frequently asked questions about flying from Ontario to Islip, New York

  • 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 10h 55m, 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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