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?

On the Ontario to Islip route, being flexible with your departure day can save you up to 17%. Sunday is the cheapest day at $496 round-trip on average, while Tuesday is the most expensive at $592: a $96 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

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 $399 to $1,220. That means the highest observed fare was about 3x 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 $36 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 $496 to $592, with an average of $508 over the past 12 months. Anything below $496 counts as a good deal.

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

Frontier ($399) and Southwest ($433) are the cheapest airlines to fly round-trip from Ontario to Islip according to KAYAK data over the last 5 days.

$281 CHEAP FLIGHTS from Ontario to Islip (ONT - ISP)

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Cheapest round-trip

$399

Typical prices: $496-$592

Frontier

Tue 9/25Sat 9/29

ONT - ISP • 2 stops

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Flight Deals

Cheap Flights from Ontario to Islip (ONT-ISP)

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 Ontario to Islip

Fri, Sep 25 - Tue, Sep 29

11:45 am - 4:58 pmONT Ontario-ISP Islip Long Island

26h 13m2 stops Denver Intl Orlando

5:43 pm - 5:48 pmISP Islip Long Island-ONT Ontario

51h 05m2 stops Orlando Houston George Bush Intcntl

$399Frontier

Thu, Nov 12 - Sun, Nov 15

11:15 am - 11:30 pmONT Ontario-ISP Islip Long Island

9h 15m2 stops Las Vegas Harry Reid Intl Baltimore/Washington

5:35 am - 2:05 pmISP Islip Long Island-ONT Ontario

11h 30m2 stops Baltimore/Washington Denver Intl

$433Southwest

Fri, Oct 16 - Mon, Oct 19

11:52 am - 5:30 pmONT Ontario-ISP Islip Long Island

26h 38m2 stops Denver Intl Orlando

6:55 pm - 4:48 pmISP Islip Long Island-ONT Ontario

24h 53m2 stops Orlando Dallas/Fort Worth

$442Frontier

Fri, Sep 18 - Sun, Sep 20

8:24 pm - 4:58 pmONT Ontario-ISP Islip Long Island

17h 34m2 stops Las Vegas Harry Reid Intl Orlando

5:43 pm - 11:47 pmISP Islip Long Island-ONT Ontario

33h 04m2 stops Orlando Denver Intl

$482Frontier

Fri, Sep 11 - Mon, Sep 28

6:15 am - 4:58 pmONT Ontario-ISP Islip Long Island

31h 43m2 stops Denver Intl Orlando

5:43 pm - 9:09 amISP Islip Long Island-ONT Ontario

42h 26m2 stops Orlando Las Vegas Harry Reid Intl

$484Frontier

Fri, Oct 9 - Mon, Oct 12

8:00 am - 5:30 pmONT Ontario-ISP Islip Long Island

30h 30m2 stops Las Vegas Harry Reid Intl Orlando

6:55 pm - 10:29 amISP Islip Long Island-ONT Ontario

18h 34m2 stops Orlando Denver Intl

$516Frontier

Fri, Sep 11 - Mon, Sep 14

2:30 pm - 4:58 pmONT Ontario-ISP Islip Long Island

23h 28m2 stops Las Vegas Harry Reid Intl Orlando

5:43 pm - 9:09 amISP Islip Long Island-ONT Ontario

42h 26m2 stops Orlando Las Vegas Harry Reid Intl

$531Frontier

Thu, Sep 17 - Thu, Sep 24

8:40 pm - 9:40 amONT Ontario-ISP Islip Long Island

10h 00m2 stops Phoenix Sky Harbor Intl Baltimore/Washington

4:05 pm - 10:15 pmISP Islip Long Island-ONT Ontario

9h 10m2 stops Baltimore/Washington Denver Intl

$569Southwest

Thu, Sep 24 - Sun, Sep 27

8:40 pm - 9:40 amONT Ontario-ISP Islip Long Island

10h 00m2 stops Phoenix Sky Harbor Intl Baltimore/Washington

6:20 am - 2:10 pmISP Islip Long Island-ONT Ontario

10h 50m2 stops Baltimore/Washington Denver Intl

$658Southwest

Thu, Oct 15 - Sun, Oct 18

11:52 am - 6:00 pmONT Ontario-ISP Islip Long Island

27h 08m2 stops Denver Intl Orlando

6:25 pm - 7:08 pmISP Islip Long Island-ONT Ontario

27h 43m2 stops Orlando Dallas/Fort Worth

$666Frontier

Booking Insights

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 from Ontario to Islip with more confidence.

Prices

Airlines

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

Round-trip flights from Ontario to Islip start at $399. Prices are below average for this route right now, with typical round-trip fares ranging from $496 to $592. The lowest price found in the past 5 days was $399 on Frontier.

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Cheapest flight	$281

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.

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?
On the Ontario to Islip route, being flexible with your departure day can save you up to 17%. Sunday is the cheapest day at $496 round-trip on average, while Tuesday is the most expensive at $592: a $96 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.
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 $399 to $1,220. That means the highest observed fare was about 3x 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 $36 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 $496 to $592, with an average of $508 over the past 12 months. Anything below $496 counts as a good deal.

If your dates can be flexible, aim for a Sunday departure instead of Tuesday. On this route, Sunday flights average $496 - about $96 less than Tuesday (16% savings) based on the last 12 months.

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

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Ontario (ONT)

Islip (ISP)

ONT - ISP

$281 Find Cheap Flights from Ontario to Islip - Compare and Save

Everything you should know

Cheap Flights from Ontario to Islip (ONT-ISP)

Recent round-trip flight deals from Ontario to Islip

Recent one-way flight deals from Ontario to Islip

Recent last minute flight deals from Ontario to Islip

Price, demand and travel trends for Ontario to Islip flights

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

What is the cheapest airline 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

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

Information on your arrival and departure airports

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

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