What airlines fly to Ontario?

Delta, United Airlines and JetBlue are the top three most popular airlines that fly to Ontario from Islip according to our data. Delta is the first choice among our users, with 30% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 10 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.

$250 Cheap Flights from Islip to Ontario in 2025

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Find the cheapest flights from Islip to Los Angeles

Round-trip

One-way

Cheap round-trip flights

9:49 am - 6:35 pmISP-ONT

11h 46m2 stops

12:32 pm - 10:37 amONT-ISP

19h 05m2 stops

$280Frontier

Find Deal

Fri, Oct 3 - Thu, Oct 16

9:49 am - 6:35 pmISP-ONT

11h 46m2 stops

12:28 pm - 9:04 amONT-ISP

17h 36m2 stops

$333Frontier

Find Deal

Fri, Sep 19 - Thu, Sep 25

7:30 am - 8:42 pmISP-ONT

16h 12m2 stops

6:41 pm - 10:58 amONT-ISP

13h 17m2 stops

$885

Find Deal

Wed, Dec 10 - Sun, Dec 14

2:19 pm - 11:59 pmISP-ONT

12h 40m2 stops

7:18 pm - 10:58 amONT-ISP

12h 40m2 stops

$1,139

Find Deal

Wed, Dec 24 - Tue, Dec 30

2:19 pm - 11:59 pmISP-ONT

12h 40m2 stops

7:18 pm - 10:58 amONT-ISP

12h 40m2 stops

$1,214

Find Deal

Wed, Dec 24 - Fri, Jan 2

2:19 pm - 11:59 pmISP-ONT

12h 40m2 stops

7:18 pm - 10:58 amONT-ISP

12h 40m2 stops

$1,261

Find Deal

Wed, Dec 31 - Sun, Jan 4

Frontier flights from Islip to Ontario

Our best Frontier deals on Islip to Ontario flight tickets

Frontier

Oct 3

ISP9:49 amIslip Long Island

11h 46m

2 stops

ONT6:35 pmOntario

Oct 16

ONT12:32 pmOntario

19h 05m

2 stops

ISP10:37 amIslip Long Island

$280

Find similar

Frontier

Sep 19

ISP9:49 amIslip Long Island

11h 46m

2 stops

ONT6:35 pmOntario

Sep 25

ONT12:28 pmOntario

17h 36m

2 stops

ISP9:04 amIslip Long Island

$333

Find similar

Fly from

Fly to

Route

Depart

Return

Price

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Fri 10/3

9:49 am-6:35 pm

2 stops11h 46m

Ontario

Thu 10/16

12:32 pm-10:37 am

2 stops19h 05m

$280

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Fri 9/19

9:49 am-6:35 pm

2 stops11h 46m

Ontario

Thu 9/25

12:28 pm-9:04 am

2 stops17h 36m

$333

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 12/10

7:30 am-8:42 pm

2 stops16h 12m

Ontario

Sun 12/14

6:41 pm-10:58 am

2 stops13h 17m

$885

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 12/24

2:19 pm-11:59 pm

2 stops12h 40m

Ontario

Tue 12/30

7:18 pm-10:58 am

2 stops12h 40m

$1,139

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 12/24

2:19 pm-11:59 pm

2 stops12h 40m

Ontario

Fri 1/2

7:18 pm-10:58 am

2 stops12h 40m

$1,214

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 12/31

2:19 pm-11:59 pm

2 stops12h 40m

Ontario

Sun 1/4

7:18 pm-10:58 am

2 stops12h 40m

$1,261

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 11/19

2:19 pm-11:56 pm

2 stops12h 37m

$420

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Sat 11/15

2:19 pm-11:56 pm

2 stops12h 37m

$425

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Sat 11/15

2:19 pm-11:56 pm

2 stops12h 37m

$480

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 11/5

2:19 pm-11:56 pm

2 stops12h 37m

$534

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first

How to get the cheapest flight ticket from Islip 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 Friday when prices can be found for as low as $302. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Islip to Ontario for around $377.

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 to Ontario when you can find flight prices for as low as $317. 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 morning when prices are $362 on average. Flights to Ontario from Islip in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from Islip to Ontario

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

Estimated round-trip price

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

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

Direct flights	None

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

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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 11h 46m 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.