$139 Cheap Delta flights Newark Liberty Intl. Airport (EWR) to Ontario (ONT)

View $139 flight on Sun, Aug 31, 2025Opens in a new window

$139 Cheap Delta flights Newark Liberty Intl. Airport (EWR) to Ontario (ONT)

Prices were available within the past 7 days and start at $139 for one-way flights and $277 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Sep 16 - Tue, Sep 23
EWR
New York
ONT
Ontario
$277 Roundtrip, just found
$277
Roundtrip
just found
Select Delta flight, departing Tue, Sep 16 from New York to Ontario, returning Tue, Sep 23, priced at $277 just found
Delta
Tue, Aug 19 - Tue, Aug 26
EWR
New York
ONT
Ontario
$280 Roundtrip, found 3 hours ago
$280
Roundtrip
found 3 hours ago
Select Delta flight, departing Tue, Aug 19 from New York to Ontario, returning Tue, Aug 26, priced at $280 found 3 hours ago
Delta
Sat, Sep 20 - Thu, Sep 25
EWR
New York
ONT
Ontario
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Sep 20 from New York to Ontario, returning Thu, Sep 25, priced at $294 found 1 day ago
Delta
Fri, Sep 12 - Tue, Sep 16
EWR
New York
ONT
Ontario
$300 Roundtrip, found 11 hours ago
$300
Roundtrip
found 11 hours ago
Select Delta flight, departing Fri, Sep 12 from New York to Ontario, returning Tue, Sep 16, priced at $300 found 11 hours ago
Flights from Newark Liberty Intl. Airport (EWR) to Ontario (ONT)
Origin airport
Newark Liberty Intl. Airport
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Popular airline
American Airlines
Distance
2402 mi
Average flight time
9 hours 41 mins

Frequently asked questions

How much is a Delta Air Lines flight from Liberty Intl. Airport (EWR) to Los Angeles - Ontario Intl. Airport (ONT)?
You'll discover affordable return Delta Air Lines flights from $277 from EWR to ONT by organizing your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $139 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from EWR to ONT with Delta Air Lines?
January is one of the least expensive months to travel to Ontario with Delta Air Lines. You could also find excellent prices on return and one-way fares in April.
What is the cheapest time to book flights from Liberty Intl. Airport (EWR) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
Search for cheap Delta Air Lines flights from Liberty Intl. Airport (EWR) to Los Angeles - Ontario Intl. Airport (ONT) one to three months before your departure day. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare class and itinerary, the ideal day to book a domestic flight is generally Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Liberty Intl. Airport (EWR) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the "Nonstop" filter when looking for direct Delta Air Lines flights from EWR to ONT. You'll also be able to compare other airlines servicing the same direct trip.
What is the earliest Delta Air Lines flight from EWR to ONT?
Sort your results by "Morning" and "Early Morning" to see the earliest departures from EWR to ONT. Taking off early means you're less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Ontario?
Take a Delta Air Lines flight from Liberty Intl. Airport (EWR) to Ontario, and you'll most likely arrive at Los Angeles - Ontario Intl. Airport (ONT). This is the airline's main hub in this destination.
Why fly with Delta Air Lines from EWR to ONT?
With an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is the leading choice for many passengers heading from EWR to ONT. Plus, if you're a Delta SkyMiles and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be put toward future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Liberty Intl. Airport (EWR) to Los Angeles - Ontario Intl. Airport (ONT)?
Typically, you can cancel or reschedule your flight, although additional fees may apply if you booked more than 24 hours ago. Need flexible options? Make use of Expedia's "Changes included" or "No cancel fee" filter to find flights that won't charge extra if you have to adjust your plans. To modify your booking, visit "Trips," select your flight and click on "Manage Booking" for further information.

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*Available to One Key members.