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Cheap flights from Islip, New York to Los Angeles from $440

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 6/10. 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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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
6:00 am - 12:05 pm
ISP
-
ONT
9h 05m
1 stop
Southwest Logo
11:55 pm - 1:45 pm
ONT
-
ISP
10h 50m
2 stops
$440Southwest
Wed, Jun 10 - Mon, Jun 15
Southwest Logo
6:00 am - 12:05 pm
ISP
-
ONT
9h 05m
1 stop
Southwest Logo
9:40 pm - 8:05 am
ONT
-
ISP
7h 25m
1 stop
$485Southwest
Wed, Jun 10 - Mon, Jun 15
Southwest Logo
4:40 pm - 11:00 pm
ISP
-
ONT
9h 20m
2 stops
Southwest Logo
11:55 pm - 1:45 pm
ONT
-
ISP
10h 50m
2 stops
$487Southwest
Wed, Jun 10 - Mon, Jun 15
Southwest Logo
4:40 pm - 10:00 pm
ISP
-
ONT
8h 20m
1 stop
Southwest Logo
9:55 pm - 11:50 am
ONT
-
ISP
10h 55m
1 stop
$592Southwest
Sat, May 16 - Wed, May 20
Southwest Logo
6:00 am - 2:55 pm
ISP
-
ONT
11h 55m
2 stops
Southwest Logo
7:55 am - 10:10 pm
ONT
-
ISP
11h 15m
2 stops
$597Southwest
Sat, May 16 - Wed, May 20

Southwest flights from Islip, New York to Ontario

Our best Southwest deals on Islip, New York to Ontario flight tickets
Southwest
Jun 10
ISP6:00 amIslip Long Island
9h 05m
1 stop
ONT12:05 pmOntario
Jun 15
ONT11:55 pmOntario
10h 50m
2 stops
ISP1:45 pmIslip Long Island
$440
Southwest
Jun 10
ISP6:00 amIslip Long Island
9h 05m
1 stop
ONT12:05 pmOntario
Jun 15
ONT9:40 pmOntario
7h 25m
1 stop
ISP8:05 amIslip Long Island
$485
Southwest
Jun 10
ISP4:40 pmIslip Long Island
9h 20m
2 stops
ONT11:00 pmOntario
Jun 15
ONT11:55 pmOntario
10h 50m
2 stops
ISP1:45 pmIslip Long Island
$487

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 May 3, 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

Wed 6/10

6:00 am-12:05 pm

1 stop9h 05m

Ontario

Mon 6/15

11:55 pm-1:45 pm

2 stops10h 50m

$440
Quickest round-trip

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 6/10

6:00 am-12:05 pm

1 stop9h 05m

Ontario

Mon 6/15

9:40 pm-8:05 am

1 stop7h 25m

$485

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Wed 6/10

4:40 pm-11:00 pm

2 stops9h 20m

Ontario

Mon 6/15

11:55 pm-1:45 pm

2 stops10h 50m

$487

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Sat 5/16

4:40 pm-10:00 pm

1 stop8h 20m

Ontario

Wed 5/20

9:55 pm-11:50 am

1 stop10h 55m

$592

IslipOntario

ISP - ONT

ISPONT

Islip Long Island

Sat 5/16

6:00 am-2:55 pm

2 stops11h 55m

Ontario

Wed 5/20

7:55 am-10:10 pm

2 stops11h 15m

$597

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Los Angeles from

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 Friday when prices can be found for as low as $307. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Islip, New York to Ontario for around $432.

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 $327. 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 $333 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

8h 20m

Direct flights

None
The fastest flight from Islip, New York to Ontario takes 8h 20m
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 8h 20m 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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