Which airports can I use when flying from Ontario to Islip?

Flights from Ontario to Islip usually depart from Ontario (ONT) and arrive at Islip Long Island (ISP).

Can I save money by using flexible dates for flights from Ontario to Islip?

Yes. Flexible dates can save you up to 16% on flights from Ontario to Islip. Wednesday is the cheapest departure day at $498 round-trip on average, while Tuesday is the most expensive at $592, a difference of $94. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Do I need a passport to fly from Ontario to Islip?

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Have flight prices from Ontario to Islip changed much recently?

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $623 to $1,439. That means the highest observed fare was about 2x higher than the lowest one.

What is the time difference between Ontario and Islip?

Islip is 3 hours ahead of Ontario (Eastern Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

What car rental options are available at Islip Long Island Airport (ISP)?

Islip Long Island Airport (ISP) hosts 5 major car rental companies, with daily rates starting from around $38 for economy cars. Top options include: • Budget • Enterprise Rent-A-Car • Avis • National • Empire Rent A Car

How much should I expect to pay for a Ontario to Islip flight?

Round-trip flights from Ontario to Islip range from $498 to $592, with an average of $508 over the past 12 months. Anything below $498 counts as a good deal.

How much is a round-trip flight from Ontario to Islip?

Round-trip flights from Ontario to Islip typically range from $498 to $592. The lowest price found in the past 5 days was $623, on Frontier.

Which airline is the cheapest to fly from Ontario to Islip?

Frontier ($623) and Southwest ($642) are the cheapest airlines to fly round-trip from Ontario to Islip according to KAYAK data over the last 5 days.

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Cheapest round-trip

$623

Typical prices: $498-$592

Frontier

Sat 11/24Mon 12/10

ONT - ISP • 2 stops

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Cheap Flights from Ontario to Islip (ONT-ISP)

Cheap flights from Ontario to Islip with top airlines, updated regularly. Compare round-trip, one-way, direct and last-minute deals.

Round-trip

One-way

Tue, Nov 24 - Thu, Dec 10

4:13 pm - 3:45 pmONT Ontario-ISP Islip Long Island

20h 32m2 stops Las Vegas Harry Reid Intl Orlando

2:45 pm - 12:20 amISP Islip Long Island-ONT Ontario

12h 35m2 stops Orlando Denver Intl

$623Frontier

Wed, Dec 2 - Sun, Dec 6

2:47 pm - 1:48 pmONT Ontario-ISP Islip Long Island

20h 01m2 stops Las Vegas Harry Reid Intl Orlando

2:45 pm - 7:44 amISP Islip Long Island-ONT Ontario

19h 59m2 stops Orlando Dallas/Fort Worth

$627Frontier

Wed, Nov 25 - Mon, Nov 30

9:50 am - 11:50 pmONT Ontario-ISP Islip Long Island

11h 00m2 stops Phoenix Sky Harbor Intl Baltimore/Washington

4:55 pm - 11:55 pmISP Islip Long Island-ONT Ontario

10h 00m2 stops Baltimore/Washington Las Vegas Harry Reid Intl

$642Southwest

Thu, Nov 19 - Fri, Nov 27

2:23 pm - 3:45 pmONT Ontario-ISP Islip Long Island

22h 22m2 stops Las Vegas Harry Reid Intl Orlando

4:40 pm - 6:20 amISP Islip Long Island-ONT Ontario

16h 40m2 stops Orlando Dallas/Fort Worth

$924Frontier

Fri, Feb 12 - Mon, Feb 15

6:27 pm - 11:04 amONT Ontario-ISP Islip Long Island

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

11:59 am - 7:07 amISP Islip Long Island-ONT Ontario

22h 08m2 stops Orlando Las Vegas Harry Reid Intl

$940Frontier

Fri, Feb 12 - Mon, Feb 15

6:27 pm - 11:04 amONT Ontario-ISP Islip Long Island

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

11:59 am - 7:07 amISP Islip Long Island-ONT Ontario

22h 08m2 stops Orlando Las Vegas Harry Reid Intl

$940Frontier

Thu, Nov 19 - Sat, Nov 28

2:23 pm - 3:45 pmONT Ontario-ISP Islip Long Island

22h 22m2 stops Las Vegas Harry Reid Intl Orlando

4:43 pm - 6:20 amISP Islip Long Island-ONT Ontario

16h 37m2 stops Orlando Dallas/Fort Worth

$964Frontier

Sat, Dec 5 - Thu, Dec 10

2:41 pm - 1:49 pmONT Ontario-ISP Islip Long Island

20h 08m2 stops Las Vegas Harry Reid Intl Orlando

2:45 pm - 7:44 amISP Islip Long Island-ONT Ontario

19h 59m2 stops Orlando Dallas/Fort Worth

$967Frontier

Thu, Feb 11 - Mon, Feb 15

6:27 pm - 11:04 amONT Ontario-ISP Islip Long Island

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

11:59 am - 12:05 amISP Islip Long Island-ONT Ontario

15h 06m2 stops Orlando Denver Intl

$1,052Frontier

Fri, Feb 12 - Tue, Feb 16

6:27 pm - 11:04 amONT Ontario-ISP Islip Long Island

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

11:59 am - 12:05 amISP Islip Long Island-ONT Ontario

15h 06m2 stops Orlando Denver Intl

$1,055Frontier

Price, demand and travel trends for Ontario to Islip flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

Prices

Airlines

How much is a round-trip flight from Ontario to Islip? This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Islip departing in november.

Find deals

Cheapest flight	$198

One-way 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.

Do I need a passport to fly from Ontario to Islip?
No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.
How much should I expect to pay for a Ontario to Islip flight?
Round-trip flights from Ontario to Islip range from $498 to $592, with an average of $508 over the past 12 months. Anything below $498 counts as a good deal.
Have flight prices from Ontario to Islip changed much recently?
Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $623 to $1,439. That means the highest observed fare was about 2x higher than the lowest one.
What car rental options are available at Islip Long Island Airport (ISP)?
Islip Long Island Airport (ISP) hosts 5 major car rental companies, with daily rates starting from around $38 for economy cars. Top options include:

• Budget
• Enterprise Rent-A-Car
• Avis
• National
• Empire Rent A Car
Which airports can I use when flying from Ontario to Islip?
Flights from Ontario to Islip usually depart from Ontario (ONT) and arrive at Islip Long Island (ISP).
Can I save money by using flexible dates for flights from Ontario to Islip?
Yes. Flexible dates can save you up to 16% on flights from Ontario to Islip. Wednesday is the cheapest departure day at $498 round-trip on average, while Tuesday is the most expensive at $592, a difference of $94.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.
What is the time difference between Ontario and Islip?
Islip is 3 hours ahead of Ontario (Eastern Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

If your dates are flexible, aim for a Wednesday departure and avoid flying on Tuesday. On this route, Wednesday flights average $498, about $94 less than Tuesday fares (16% savings) based on the last 12 months.

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ONT - ISP

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Everything you should know

Cheap Flights from Ontario to Islip (ONT-ISP)

Cheap flights from Ontario to Islip with top airlines, updated regularly. Compare round-trip, one-way, direct and last-minute deals.

Price, demand and travel trends for Ontario to Islip flights

How much is a round-trip flight from Ontario to Islip?

Which airline is the cheapest to fly from Ontario to Islip?

Key details for Ontario to Islip flights

Cheapest flight

When to book flights from Ontario to Islip

Your Ontario to Islip flight questions, answered

Your guide to booking Ontario to Islip flights

More options for your flight from Ontario to Islip

Complete your trip to Islip with a hotel stay or car rental

Information on your arrival and departure airports

Cabin class types available on flights from Ontario to Islip

Find direct flights to and from Ontario and Islip

Flights from domestic origins to Islip

Flights to other popular destinations

Find deals for your return flight