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Cheap flights from Islip, New York to Los Angeles from $373

This is the cheapest round-trip 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 9/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
12:55 pm - 7:35 pm
ISP
-
ONT
9h 40m
2 stops
Southwest Logo
7:40 am - 9:05 pm
ONT
-
ISP
10h 25m
2 stops
$373Southwest
Tue, Sep 15 - Tue, Sep 22
Southwest Logo
6:05 am - 2:05 pm
ISP
-
ONT
11h 00m
2 stops
Southwest Logo
11:55 pm - 12:10 pm
ONT
-
ISP
9h 15m
2 stops
$382Southwest
Tue, Sep 15 - Mon, Sep 21
Southwest Logo
6:00 am - 12:05 pm
ISP
-
ONT
9h 05m
1 stop
Southwest Logo
7:45 am - 9:05 pm
ONT
-
ISP
10h 20m
2 stops
$420Southwest
Tue, Jul 28 - Tue, Aug 11
Southwest Logo
12:25 pm - 7:00 pm
ISP
-
ONT
9h 35m
2 stops
Southwest Logo
7:45 am - 9:05 pm
ONT
-
ISP
10h 20m
2 stops
$425Southwest
Tue, Jul 28 - Tue, Aug 11
Southwest Logo
6:00 am - 12:05 pm
ISP
-
ONT
9h 05m
1 stop
Southwest Logo
9:40 pm - 10:15 am
ONT
-
ISP
9h 35m
1 stop
$467Southwest
Tue, Jul 28 - Mon, Aug 3
Southwest Logo
2:55 pm - 10:20 pm
ISP
-
ONT
10h 25m
2 stops
Southwest Logo
9:40 pm - 10:15 am
ONT
-
ISP
9h 35m
1 stop
$472Southwest
Tue, Jul 28 - Mon, Aug 3
Southwest Logo
6:00 am - 12:40 pm
ISP
-
ONT
9h 40m
2 stops
Southwest Logo
6:35 pm - 10:15 am
ONT
-
ISP
12h 40m
2 stops
$477Southwest
Tue, Jul 28 - Mon, Aug 3
Multiple Airlines Logo
7:26 am - 8:53 pm
ISP
-
ONT
40h 27m
3 stops
Multiple Airlines Logo
9:01 am - 10:56 am
ONT
-
ISP
22h 55m
2 stops
$986Multiple Airlines
Tue, Sep 15 - Tue, Sep 22
Multiple Airlines Logo
12:30 pm - 10:49 pm
ISP
-
ONT
13h 19m
2 stops
Multiple Airlines Logo
6:00 am - 7:45 pm
ONT
-
ISP
10h 45m
2 stops
$1,134Multiple Airlines
Thu, Oct 22 - Mon, Oct 26
Multiple Airlines Logo
7:26 am - 8:01 pm
ISP
-
ONT
15h 35m
2 stops
Multiple Airlines Logo
1:18 pm - 10:56 am
ONT
-
ISP
42h 38m
3 stops
$1,136Multiple Airlines
Tue, Sep 15 - Mon, Sep 21

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Southwest flights from Islip, New York to Ontario

Our best Southwest deals on Islip, New York to Ontario flight tickets
Southwest
Sep 15
ISP12:55 pmIslip Long Island
9h 40m
2 stops
ONT7:35 pmOntario
Sep 22
ONT7:40 amOntario
10h 25m
2 stops
ISP9:05 pmIslip Long Island
$373
Southwest
Sep 15
ISP6:05 amIslip Long Island
11h 00m
2 stops
ONT2:05 pmOntario
Sep 21
ONT11:55 pmOntario
9h 15m
2 stops
ISP12:10 pmIslip Long Island
$382
Southwest
Jul 28
ISP6:00 amIslip Long Island
9h 05m
1 stop
ONT12:05 pmOntario
Aug 11
ONT7:45 amOntario
10h 20m
2 stops
ISP9:05 pmIslip Long Island
$420

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 20, 2026.
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 - ONT

ISPONT

Islip Long Island

Tue 9/15

12:55 pm-7:35 pm

2 stops9h 40m

Ontario

Tue 9/22

7:40 am-9:05 pm

2 stops10h 25m

$373

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 9/15

6:05 am-2:05 pm

2 stops11h 00m

Ontario

Mon 9/21

11:55 pm-12:10 pm

2 stops9h 15m

$382

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 7/28

6:00 am-12:05 pm

1 stop9h 05m

Ontario

Tue 8/11

7:45 am-9:05 pm

2 stops10h 20m

$420

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 7/28

12:25 pm-7:00 pm

2 stops9h 35m

Ontario

Tue 8/11

7:45 am-9:05 pm

2 stops10h 20m

$425
Quickest round-trip

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 7/28

6:00 am-12:05 pm

1 stop9h 05m

Ontario

Mon 8/3

9:40 pm-10:15 am

1 stop9h 35m

$467

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 7/28

2:55 pm-10:20 pm

2 stops10h 25m

Ontario

Mon 8/3

9:40 pm-10:15 am

1 stop9h 35m

$472

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 7/28

6:00 am-12:40 pm

2 stops9h 40m

Ontario

Mon 8/3

6:35 pm-10:15 am

2 stops12h 40m

$477

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 9/15

7:26 am-8:53 pm

3 stops40h 27m

Ontario

Tue 9/22

9:01 am-10:56 am

2 stops22h 55m

$986

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Thu 10/22

12:30 pm-10:49 pm

2 stops13h 19m

Ontario

Mon 10/26

6:00 am-7:45 pm

2 stops10h 45m

$1,134

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Tue 9/15

7:26 am-8:01 pm

2 stops15h 35m

Ontario

Mon 9/21

1:18 pm-10:56 am

3 stops42h 38m

$1,136

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

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 Tuesday when prices can be found for as low as $297. 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 $643.

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 $336. 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 $341 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 7% 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

Fastest flight time

9h 05m

Direct flights

None
The fastest flight from Islip, New York to Ontario takes 9h 05m
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 9h 05m 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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