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ISP - ONT

$423 Find Cheap Flights from Islip to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Islip to Ontario departing on 11/28. 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
0 bags

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Islip to Ontario, 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 Islip to Ontario, as well as popular online travel agencies
In the last 7 days travelers have searched 46,646,933 times on KAYAK, and here is why:

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Cheap Flight Deals from Islip to Ontario (ISP-ONT)

 
These are the cheapest deals for flights from Islip to Ontario currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Islip to Ontario

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Islip to Ontario.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
9:04 pm - 12:09 amISP-ONT
30h 05m2 stops
2:43 pm - 8:04 pmONT-ISP
26h 21m2 stops
$992Frontier
Find Deal
Thu, Mar 6 - Tue, Mar 11
11:34 am - 11:26 amISP-ONT
26h 52m2 stops
8:59 pm - 7:02 pmONT-ISP
19h 03m2 stops
$997Frontier
Find Deal
Sun, Dec 1 - Sun, Dec 15
11:40 am - 9:00 pmISP-ONT
12h 20m2 stops
9:05 am - 10:15 pmONT-ISP
10h 10m2 stops
$1,122Southwest
Find Deal
Mon, Dec 23 - Wed, Jan 1

Flights from Islip to Ontario - Travel Insights & Trends

Get data-powered insights and trends into flights from Islip to Ontario to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Islip to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Islip to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Islip to Ontario is January, where tickets cost $255 on average. On the other hand, the most expensive months are December and July, where the average cost of tickets is $472 and $469 respectively.

How far in advance should I book a flight from Islip to Ontario?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Islip to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Islip to Ontario, you should book around 2 days before departure. For the absolute cheapest price, our data suggests you should book 98 days before departure.

Good to know

Cheapest flight

$423
Flight from Islip to Ontario

When to book flights from Islip to Ontario

Are your dates flexible? Find out the best times to travel from Islip to Ontario 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 Islip to Ontario

  • What is the cheapest flight from Islip to Ontario?

    In the last 3 days, the lowest price for a flight from Islip to Ontario was $423 for a one-way ticket and $992 for a round-trip.

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

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from Islip to Ontario?

    When flying out of Islip you will be using Islip Long Island. You will be landing at Ontario, also known as Ontario.

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

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

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

    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 Islip to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Islip 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 Islip to Ontario?

    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 Ontario with an airline and back to Islip with another airline. Booking your flights between Islip and ONT 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 Islip to Ontario?

    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 Ontario from Islip up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Book cheap flights from Islip to Ontario

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Islip to Ontario found on KAYAK in the last 72 hours.
11/28Thu
2 stopsSouthwest
14h 35mISP-ONT
$423

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

Information on your arrival and departure airports

Ontario (ONT)
Islip (ISP)

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