ONT - ISP

$152 Find Cheap Flights from Ontario to Islip

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Islip departing on 5/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Islip

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Islip, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Islip, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$430
Southwest
Thu 4/30Tue 5/5
ONT - ISP • 2 stops
Cheapest one-way
$152
Frontier
Tue 5/26
ONT - ISP • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Ontario and Islip. You'll need at least 1 connection.
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Flight Deals

Cheap Flights from Ontario to Islip (ONT-ISP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Islip that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Islip

Thu, Apr 30 - Tue, May 5
Southwest Logo
8:10 am - 11:30 pm
ONT
-
ISP
12h 20m
2 stops
Southwest Logo
9:00 am - 4:20 pm
ISP
-
ONT
10h 20m
1 stop
$430Southwest
Thu, Apr 30 - Tue, May 5
Southwest Logo
8:10 am - 11:30 pm
ONT
-
ISP
12h 20m
2 stops
Southwest Logo
6:30 am - 2:55 pm
ISP
-
ONT
11h 25m
2 stops
$435Southwest
Sun, May 31 - Thu, Jun 4
Southwest Logo
7:40 pm - 11:50 am
ONT
-
ISP
13h 10m
2 stops
Southwest Logo
5:50 pm - 10:25 pm
ISP
-
ONT
7h 35m
1 stop
$444Southwest
Sun, May 31 - Thu, Jun 4
Southwest Logo
9:55 pm - 11:50 am
ONT
-
ISP
10h 55m
1 stop
Southwest Logo
5:50 pm - 10:25 pm
ISP
-
ONT
7h 35m
1 stop
$448Southwest
Sun, May 31 - Thu, Jun 4
Southwest Logo
7:40 pm - 11:50 am
ONT
-
ISP
13h 10m
2 stops
Southwest Logo
9:10 am - 5:35 pm
ISP
-
ONT
11h 25m
2 stops
$449Southwest
Thu, Apr 30 - Tue, May 5
Southwest Logo
8:10 am - 11:30 pm
ONT
-
ISP
12h 20m
2 stops
Southwest Logo
9:00 am - 4:20 pm
ISP
-
ONT
10h 20m
1 stop
$466Southwest
Thu, Apr 30 - Tue, May 5
Southwest Logo
8:10 am - 11:30 pm
ONT
-
ISP
12h 20m
2 stops
Southwest Logo
6:30 am - 2:55 pm
ISP
-
ONT
11h 25m
2 stops
$471Southwest
Thu, Apr 30 - Mon, May 4
Southwest Logo
9:55 pm - 11:50 am
ONT
-
ISP
10h 55m
1 stop
Southwest Logo
8:35 am - 3:15 pm
ISP
-
ONT
9h 40m
1 stop
$518Southwest
Thu, Apr 30 - Mon, May 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
$523Southwest
Booking Insights

Good to know

Cheapest flight$152
Flight from Ontario to Islip

When to book flights from Ontario to Islip

Are your dates flexible? Find out the best times to travel from Ontario to Islip based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Islip

  • What is the cheapest flight from Ontario to Islip?

    In the last 3 days, the lowest price for a flight from Ontario to Islip was $152 for a one-way ticket and $430 for a round-trip.

  • Do I need a passport to fly between Ontario and Islip?

    No

  • Which aircraft models fly most regularly from Ontario to Islip?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Ontario to Islip?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Islip.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Islip?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Islip from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Islip?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Islip with an airline and back to Ontario with another airline. Booking your flights between Ontario and ISP can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Islip?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Islip from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight from Ontario to Islip

Information on your arrival and departure airports

Ontario (ONT)
Islip (ISP)