Skip to main content
Beginning of main content

ISP (Islip) to ONT (Ontario) Flights $618.8

Search over 321,000 hotels worldwide and 400 airlines worldwide.
Secure incredible value with Expedia's Price Guarantee.
No Expedia cancellation fee to change or cancel almost any hotel reservation.

Cheap ISP to ONT Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Orange County


Long Beach


Interesting Facts About Flights from Islip to Ontario (ISP to ONT)

Question : In the next four weeks, what day should you book your trip?
Answer : Since low prices are preferred, look at Aug 17th. As of Jul 24th, it's showing the cheapest ticket sales at $712. That is 11% below the average price for this route, so you can spend that extra cash on a fun experience in Ontario.

Question : Is there an alternative to Long Island MacArthur Airport (ISP) for getting you to Ontario?
Answer : Long Island MacArthur Airport is a superb airport, but in getting you to Ontario, there is a cheaper option – Westchester County Airport. It's just 37 miles away and flights are being booked 25% cheaper over the upcoming months.

Question : Are you paying the cheapest or highest price for your ticket to Ontario?
Answer : Flight prices fluctuate much less than the majority of routes in the United States for ISP to ONT. They range from $682 to $891. However, the sooner you book, the better price you tend to get.

Question : What is the cheapest round-trip ticket you can get to Ontario?
Answer : American Airlines is the leader in keeping costs down for their passengers over the next three months. Bookings are being made at just $682 and, when compared to the high-end bookings of $891, it's quite a deal.

Question : How many days should you spend in Ontario?
Answer : Over the next two months, passengers from ISP to ONT are planning on staying for three days on average.

Question : Would you be willing to change your travel days if it saved you money?
Answer : The best day to fly on a budget this month is Thursday. Having flexibility in your travel plans means you can save more, so be sure to plan ahead when possible.