What is the cheapest airline that flies from Islip Long Island to Ontario?

Frontier and Southwest are the most popular carriers operating from Islip Long Island to Ontario

What airlines fly to Ontario?

United Airlines, JetBlue and Delta are the top three most popular airlines that fly to Ontario from Islip, New York according to our data. United Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 9 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Islip Long Island Airport to Ontario Airport?

Prices for flights from Islip Long Island Airport to Ontario Airport were last updated today.

How old do you have to be to fly from Islip Long Island Airport to Ontario Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$203 Cheap Flights from Islip, New York to Ontario in 2026/27

Find the cheapest flights from Islip, New York to Los Angeles

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:33 pm - 4:21 pmISP Islip Long Island-ONT Ontario

24h 48m2 stops Orlando Las Vegas Harry Reid Intl

11:52 am - 5:56 pmONT Ontario-ISP Islip Long Island

27h 04m2 stops Denver Intl Orlando

$484Frontier

Sun, Nov 8 - Thu, Nov 12

6:33 pm - 4:21 pmISP Islip Long Island-ONT Ontario

24h 48m2 stops Orlando Las Vegas Harry Reid Intl

2:23 pm - 5:31 pmONT Ontario-ISP Islip Long Island

24h 08m2 stops Las Vegas Harry Reid Intl Orlando

$621Frontier

Sun, Nov 8 - Fri, Nov 13

6:54 pm - 10:35 amISP Islip Long Island-ONT Ontario

18h 41m2 stops Orlando Denver Intl

2:23 pm - 5:31 pmONT Ontario-ISP Islip Long Island

24h 08m2 stops Las Vegas Harry Reid Intl Orlando

$648Frontier

Mon, Nov 9 - Fri, Nov 13

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

$826Frontier

Fri, Jan 29 - Sun, Jan 31

12:10 pm - 8:55 pmISP Islip Long Island-ONT Ontario

11h 45m2 stops Baltimore/Washington Las Vegas Harry Reid Intl

9:45 am - 11:45 pmONT Ontario-ISP Islip Long Island

11h 00m2 stops Las Vegas Harry Reid Intl Baltimore/Washington

$947Southwest

Sun, Dec 20 - Sun, Dec 27

7:31 am - 10:49 pmISP Islip Long Island-ONT Ontario

18h 18m2 stops Boston Logan Intl Chicago O'Hare Intl

1:22 pm - 11:09 amONT Ontario-ISP Islip Long Island

18h 47m2 stops Denver Intl Boston Logan Intl

$1,016Multiple Airlines

Tue, Oct 6 - Tue, Oct 20

12:30 pm - 12:18 pmISP Islip Long Island-ONT Ontario

26h 48m2 stops Boston Logan Intl San Francisco

1:32 pm - 11:09 amONT Ontario-ISP Islip Long Island

18h 37m2 stops Denver Intl Boston Logan Intl

$1,019Multiple Airlines

Wed, Oct 21 - Mon, Oct 26

12:30 pm - 10:51 pmISP Islip Long Island-ONT Ontario

13h 21m2 stops Boston Logan Intl San Francisco

1:32 pm - 11:09 amONT Ontario-ISP Islip Long Island

18h 37m2 stops Denver Intl Boston Logan Intl

$1,106Multiple Airlines

Wed, Oct 21 - Mon, Oct 26

12:30 pm - 12:18 pmISP Islip Long Island-ONT Ontario

26h 48m2 stops Boston Logan Intl San Francisco

1:32 pm - 11:09 amONT Ontario-ISP Islip Long Island

18h 37m2 stops Denver Intl Boston Logan Intl

$1,140Multiple Airlines

Wed, Oct 21 - Mon, Oct 26

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

$1,191Frontier

Mon, Feb 15 - Fri, Feb 19

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Frontier flights from Islip, New York to Ontario

Our best Frontier deals on Islip, New York to Ontario flight tickets

Frontier

Nov 8

ISP6:33 pmIslip Long Island

24h 48m

2 stops

ONT4:21 pmOntario

Nov 12

ONT11:52 amOntario

27h 04m

2 stops

ISP5:56 pmIslip Long Island

$484

Frontier

Nov 8

ISP6:33 pmIslip Long Island

24h 48m

2 stops

ONT4:21 pmOntario

Nov 13

ONT2:23 pmOntario

24h 08m

2 stops

ISP5:31 pmIslip Long Island

$621

Frontier

Nov 9

ISP6:54 pmIslip Long Island

18h 41m

2 stops

ONT10:35 amOntario

Nov 13

ONT2:23 pmOntario

24h 08m

2 stops

ISP5:31 pmIslip Long Island

$648

momondo Fare Finder

Use the filters below to find and compare flights from Islip, New York to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Sun 11/8

6:33 pm-4:21 pm

2 stops24h 48m

Ontario

Thu 11/12

11:52 am-5:56 pm

2 stops27h 04m

$484

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Sun 11/8

6:33 pm-4:21 pm

2 stops24h 48m

Ontario

Fri 11/13

2:23 pm-5:31 pm

2 stops24h 08m

$621

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Mon 11/9

6:54 pm-10:35 am

2 stops18h 41m

Ontario

Fri 11/13

2:23 pm-5:31 pm

2 stops24h 08m

$648

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Fri 1/29

11:59 am-12:05 am

2 stops15h 06m

Ontario

Sun 1/31

6:27 pm-11:04 am

2 stops13h 37m

$826

Quickest round-trip

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Sun 12/20

12:10 pm-8:55 pm

2 stops11h 45m

Ontario

Sun 12/27

9:45 am-11:45 pm

2 stops11h 00m

$947

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Tue 10/6

7:31 am-10:49 pm

2 stops18h 18m

Ontario

Tue 10/20

1:22 pm-11:09 am

2 stops18h 47m

$1,016

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Wed 10/21

12:30 pm-12:18 pm

2 stops26h 48m

Ontario

Mon 10/26

1:32 pm-11:09 am

2 stops18h 37m

$1,019

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Wed 10/21

12:30 pm-10:51 pm

2 stops13h 21m

Ontario

Mon 10/26

1:32 pm-11:09 am

2 stops18h 37m

$1,106

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Wed 10/21

12:30 pm-12:18 pm

2 stops26h 48m

Ontario

Mon 10/26

1:32 pm-11:09 am

2 stops18h 37m

$1,140

IslipOntario

ISP Islip Long Island - ONT Ontario

ISPONT

Islip Long Island

Mon 2/15

11:59 am-7:07 am

2 stops22h 08m

Ontario

Fri 2/19

6:27 pm-11:04 am

2 stops13h 37m

$1,191

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Islip, New York to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Wednesday when prices can be found for as low as $337. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Islip, New York to Ontario for around $652.

What is the cheapest time of day to depart on your flight to Ontario?

In the evening is the cheapest time of day to fly from Islip, New York to Ontario when you can find flight prices for as low as $364. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $408 on average. Flights to Ontario from Islip, New York in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Can stopping save me money on Islip, New York to Ontario flights?

You could potentially save up to 2% on your flight if you consider stops on a Islip, New York to Ontario flight.

When to book flights from Islip, New York to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Islip, New York to Ontario (ISP to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Ontario

Best Price Found	$203
Fastest flight time	18h 18m
Direct flights	None

The best one-way flight to Ontario from Islip, New York in the past 72 hours is $203. The best round-trip flight deal from Islip, New York to Ontario found on momondo in the last 72 hours is $484.

The fastest flight from Islip, New York to Ontario takes 18h 18m

There are no direct flights from Islip, New York to Ontario. There are no popular flight routes from Islip, New York to Ontario.

Search flight deals

Frequently asked questions about flying from Islip, New York to Ontario

How far is Islip Long Island to Ontario by plane?
The distance between Islip Long Island and Ontario is about 2454.1 mi. Typically, this will take 18h 18m by plane in normal conditions.
When did momondo last update prices for flights from Islip Long Island Airport to Ontario Airport?
Prices for flights from Islip Long Island Airport to Ontario Airport were last updated today.
How old do you have to be to fly from Islip Long Island Airport to Ontario Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Ontario?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Islip to Ontario. momondo saves you time and could save you money on your trip.

Can I find flights from Islip to Ontario with flexible booking policies on momondo?

All flight searches from Islip to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to Ontario?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Islip to Ontario.

I’m not ready to book a flight from Islip to Ontario right now. Can momondo alert me if prices change?

Price alerts on flights to Ontario from Islip are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from Islip, New York to Los Angeles from $203

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Los Angeles departing on 10/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Islip, New York to Ontario

Our best Frontier deals on Islip, New York to Ontario flight tickets

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Use the filters below to find and compare flights from Islip, New York to Ontario that are best for you.

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How to get the cheapest flight ticket from Islip, New York to Ontario

What is the cheapest day to depart on your flight to Ontario?

What is the cheapest time of day to depart on your flight to Ontario?

Can stopping save me money on Islip, New York to Ontario flights?

What is the cheapest airline that flies from Islip Long Island to Ontario?

What airlines fly to Ontario?

When to book flights from Islip, New York to Ontario

Cheap Islip, New York to Ontario (ISP to ONT) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Islip, New York to Ontario

Why use momondo?

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing California

Fly your favorite airline to Los Angeles

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List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

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