Cheap Flight Tickets from Islip (ISP) to Ontario (ONT), Starting at $987

Good to Know: Cheapest and Fastest ISP - ONT Flights

Useful information for finding best airline tickets from Long Island Mac Arthur to Ontario International on your next trip.

Cheapest Round Trip Flight

$987

WN Southwest Airlines • 2 stops • 17h 25m

Aug 31 – Sep 02

The cheapest round trip flight from Islip to Ontario (ISP-ONT-ISP) is currently $987

🔍 Search Flights

Fastest Flight

15h 5m

The fastest nonstop flight from Islip to Ontario (ISP-ONT) takes 15h 5m

Top Airlines Flying from Islip to Ontario

Southwest Airlines-WN

Southwest Airlines

Latest Flight Deals from Islip (ISP) to Ontario (ONT)

Compare and book low fare round-trip air tickets from Islip to Ontario. Ideal for travelers with confirmed return itineraries.

Aug 31 - Sep 02, Economy
WN
Islip → Ontario
17h 25m
12:35 PM - 8:20 PM • 2 stops
WN
Islip → Ontario
11h 50m
10:55 AM - 9:05 PM • 1 stop
$987
Southwest Airlines
Aug 31 - Sep 02, Economy
WN
Islip → Ontario
18h 25m
12:35 PM - 8:40 PM • 2 stops
WN
Islip → Ontario
11h 50m
10:55 AM - 9:05 PM • 1 stop
$987
Southwest Airlines
Aug 31 - Sep 02, Economy
WN
Islip → Ontario
15h 5m
4:05 PM - 10:10 PM • 2 stops
WN
Islip → Ontario
13h 25m
10:35 PM - 9:40 AM • 1 stop
$987
Southwest Airlines
Aug 31 - Sep 02, Economy
WN
Islip → Ontario
17h 30m
6:10 AM - 2:00 PM • 2 stops
WN
Islip → Ontario
11h 50m
10:55 AM - 9:05 PM • 1 stop
$987
Southwest Airlines
Aug 31 - Sep 02, Economy
WN
Islip → Ontario
15h 50m
12:35 PM - 7:25 PM • 2 stops
WN
Islip → Ontario
11h 50m
10:55 AM - 9:05 PM • 1 stop
$987
Southwest Airlines

Fly from Islip to Ontario with the Best Airfare Deals on FareLeaders

Looking for a cheap last-minute deal or the best round-trip flight from Islip to Ontario? Find the biggest savings on one-way and round-trip tickets right here.

FAQs on Islip to Ontario Flights

What are the airports in Islip?
ISP
What’s the most popular airline flying from ISP to ONT?
The most popular airline flying from Islip to Ontario are
Can I fly from ISP to ONT non-stop?
NO
Which airlines fly nonstop between Islip and Ontario?
The non-stop flights between Islip and Ontario are .
What’s the earliest departure time from ISP to ONT Airport?
The earliest flight leaves ISP at 6:10 am and lands in ONT - Ontario International
What are the airports in Ontario?
ONT
Can I make changes to my Islip to Ontario flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from ISP to ONT?
Read the fare rules of the Islip to Ontario air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Islip and Ontario?
operate flights between Islip and Ontario
How long does a flight from Islip to Ontario take?
It takes approximately 6 hour to fly non-stop from ISP to ONT, which is 2464.25 miles by air.
Which airlines provide the cheapest flights from Islip (ISP) to Ontario (ONT) ?
In the past couple of days, the cheapest tickets to ONT from ISP were found on WN : USD 987
Do I need a passport to fly between ISP and ONT?
No
What’s the latest departure time from ISP to ONT ?
The last flight leaves ISP at 4:05 pm

Islip (ISP) to Ontario (ONT): Airport Information

Origin Airport Long Island Mac Arthur , Islip, US
Destination Airport Ontario International , Ontario, US
Distance 2464 miles

More Flight Options for Islip (ISP) and Ontario (ONT)

Why Fareleaders for ISP to ONT Plane Tickets

Lowest Prices
Lowest Prices
Uncover the best deals on Islip to Ontario flights by comparing fares from hundreds of airlines and agencies.
New Deals
New Deals Everyday
Get the best prices on ISP to ONT flights—we update our fares daily so you never miss a saving.
Best Travel Options
No Service Fees
Compare hundreds of Islip to Ontario flights and secure the best deals—we never add any service fees.
Get Fare Drop Alert
Be the first to know when fares drop for the Islip (ISP) to Ontario (ONT)
Terms and Conditions*