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

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

What cabin classes can I book on flights from Islip to Ontario?

Only Economy Class is available on flights from Islip to Ontario.

Which airports do connecting flights from Islip to Ontario pass through?

Most connecting flights from Islip to Ontario pass through Baltimore/Washington (BWI), which handles 100% of one-stop traffic on this route.

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

Yes. Flexible dates can save you up to 62% on flights from Islip to Ontario. Tuesday is the cheapest departure day at $425 round-trip on average, while Friday is the most expensive at $1,106, a difference of $681. 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 popular places can I visit in Ontario?

Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

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

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 Islip to Ontario 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 $607 to $1,990. That means the highest observed fare was about 3x higher than the lowest one.

How are flight prices from Islip to Ontario looking right now?

One-way fares from Islip to Ontario are currently lower than usual. Average one-way flight prices are about $302, which is 32% below the typical average for this route.

What is the time difference between Islip and Ontario?

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

What car rental options are available at Ontario Airport (ONT)?

Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates averaging $60 for economy cars. Top options include: • Fox • Europcar • Thrifty • Alamo • Dollar

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

Round-trip flights from Islip to Ontario typically range from $425 to $610. The lowest price found in the past 5 days was $607, on Frontier.

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

Frontier ($607) offered the cheapest round-trip ticket from Islip to Ontario in the last 5 days.

What is the cheapest layover airport when flying from Islip to Ontario?

Flights via Baltimore/Washington (BWI) offer the most affordable fares, with an average round-trip price of $1,106. Based on KAYAK data over the past 3 months.

When flying from Islip to Ontario which airport offers the shortest layover?

Baltimore/Washington (BWI) had the shortest average connection time for Islip to Ontario layovers at 5h 14m over the past 3 months.

$232 CHEAP FLIGHTS from Islip to Ontario (ISP - ONT)

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Cheapest round-trip

$607

Typical prices: $425-$610

Frontier

Fri 2/23Sun 2/25

ISP - ONT • 2 stops

Cheapest one-way

$232

Typical prices: $200-$443

Southwest

Wed 2/21

ISP - ONT • 2 stops

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Flight Deals

Cheap Flights from Islip to Ontario (ISP-ONT)

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Islip to Ontario

Tue, Feb 23 - Thu, Feb 25

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

15h 06m2 stops Orlando Denver Intl

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

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

$607Frontier

Tue, Feb 23 - Thu, Feb 25

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

22h 08m2 stops Orlando Las Vegas Harry Reid Intl

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

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

$623Frontier

Thu, Nov 19 - Thu, Nov 26

6:33 pm - 5:23 pmISP Islip Long Island-ONT Ontario

25h 50m2 stops Orlando Houston George Bush Intcntl

2:01 pm - 3:45 pmONT Ontario-ISP Islip Long Island

22h 44m2 stops Las Vegas Harry Reid Intl Orlando

$752Frontier

Mon, Nov 23 - Wed, Dec 2

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

16h 40m2 stops Orlando Dallas/Fort Worth

2:00 pm - 1:22 pmONT Ontario-ISP Islip Long Island

20h 22m2 stops Las Vegas Harry Reid Intl Orlando

$810Frontier

Mon, Nov 23 - Wed, Dec 2

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

16h 40m2 stops Orlando Dallas/Fort Worth

2:00 pm - 1:22 pmONT Ontario-ISP Islip Long Island

20h 22m2 stops Las Vegas Harry Reid Intl Orlando

$811Frontier

Tue, Nov 24 - Sun, Nov 29

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

16h 40m2 stops Orlando Dallas/Fort Worth

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

20h 32m2 stops Las Vegas Harry Reid Intl Orlando

$1,030Frontier

Fri, Mar 5 - Sun, Mar 14

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

15h 06m2 stops Orlando Denver Intl

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

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

$1,155Frontier

Sat, Feb 13 - Sun, Feb 21

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

15h 06m2 stops Orlando Denver Intl

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

13h 37m2 stops Las Vegas Harry Reid Intl Orlando

$1,990Frontier

Booking Insights

Price, demand and travel trends for Islip to Ontario flights

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

Prices

Airlines

Layovers

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

Find deals

Cheapest flight	$232

One-way 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.

What cabin classes can I book on flights from Islip to Ontario?
Only Economy Class is available on flights from Islip to Ontario.
Do I need a passport to fly from Islip to Ontario?
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 Islip to Ontario 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 $607 to $1,990. That means the highest observed fare was about 3x higher than the lowest one.
How are flight prices from Islip to Ontario looking right now?
One-way fares from Islip to Ontario are currently lower than usual. Average one-way flight prices are about $302, which is 32% below the typical average for this route.
What car rental options are available at Ontario Airport (ONT)?
Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates averaging $60 for economy cars. Top options include:

• Fox
• Europcar
• Thrifty
• Alamo
• Dollar
Which airports can I use when flying from Islip to Ontario?
Flights from Islip to Ontario usually depart from Islip Long Island (ISP) and arrive at Ontario (ONT).
Which airports do connecting flights from Islip to Ontario pass through?
Most connecting flights from Islip to Ontario pass through Baltimore/Washington (BWI), which handles 100% of one-stop traffic on this route.
Can I save money by using flexible dates for flights from Islip to Ontario?
Yes. Flexible dates can save you up to 62% on flights from Islip to Ontario. Tuesday is the cheapest departure day at $425 round-trip on average, while Friday is the most expensive at $1,106, a difference of $681.

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 Islip and Ontario?
Ontario is 3 hours behind Islip (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.
What popular places can I visit in Ontario?
Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

If your dates are flexible, aim for a Tuesday departure and avoid flying on Friday. On this route, Tuesday flights average $425, about $681 less than Friday fares (62% savings) based on the last 12 months.
If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.

• Ontario Airport Inn
• Azure Hotel & Suites, Trademark Collection by Wyndham
• Holiday Inn Ontario Airport By IHG

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ISP - ONT

$232 Find Cheap Flights from Islip to Ontario - Compare and Save

Everything you should know

Cheap Flights from Islip to Ontario (ISP-ONT)

Recent round-trip flight deals from Islip to Ontario

Recent one-way flight deals from Islip to Ontario

Recent last minute flight deals from Islip to Ontario

Price, demand and travel trends for Islip to Ontario flights

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

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

What is the cheapest layover airport when flying from Islip to Ontario?

When flying from Islip to Ontario which airport offers the shortest layover?

Key details for Islip to Ontario flights

Cheapest flight

When to book flights from Islip to Ontario

Your Islip to Ontario flight questions, answered

Your guide to booking Islip to Ontario flights

More options for your flight from Islip to Ontario

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

Information on your arrival and departure airports

Cabin class types available on flights from Islip to Ontario

Find direct flights to and from Islip and Ontario

Flights from domestic origins to Ontario

Flights to other popular destinations

Find deals for your return flight