$143 Cheap Flights from Ontario (ONT) to Newark Liberty Intl. Airport (EWR)

View $143 flight on Tue, Sep 23, 2025Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Newark Liberty Intl. Airport (EWR)

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Find available prices by choosing your travel dates.

Cheap Flights from Ontario to Newark Liberty Intl. Airport (ONT-EWR)

Prices were available within the past 7 days and start at $143 for one-way flights and $267 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, May 28 - Sat, May 31
ONT
Ontario
EWR
New York
$267 Roundtrip, found 2 hours ago
$267
Roundtrip
found 2 hours ago
Select United flight, departing Wed, May 28 from Ontario to New York, returning Sat, May 31, priced at $267 found 2 hours ago
Hawaiian Airlines
Tue, Sep 16 - Wed, Sep 17
ONT
Ontario
EWR
New York
$269 Roundtrip, found 10 hours ago
$269
Roundtrip
found 10 hours ago
Select Hawaiian Airlines flight, departing Tue, Sep 16 from Ontario to New York, returning Wed, Sep 17, priced at $269 found 10 hours ago
Hawaiian Airlines
Tue, Sep 30 - Tue, Oct 14
ONT
Ontario
EWR
New York
$277 Roundtrip, found 5 hours ago
$277
Roundtrip
found 5 hours ago
Select Hawaiian Airlines flight, departing Tue, Sep 30 from Ontario to New York, returning Tue, Oct 14, priced at $277 found 5 hours ago
Delta
Sat, May 24 - Thu, May 29
ONT
Ontario
EWR
New York
$277 Roundtrip, found 3 hours ago
$277
Roundtrip
found 3 hours ago
Select Delta flight, departing Sat, May 24 from Ontario to New York, returning Thu, May 29, priced at $277 found 3 hours ago
American Airlines
Fri, Jul 4 - Tue, Jul 15
ONT
Ontario
EWR
New York
$277 Roundtrip, found 5 hours ago
$277
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Fri, Jul 4 from Ontario to New York, returning Tue, Jul 15, priced at $277 found 5 hours ago
American Airlines
Fri, Jul 4 - Tue, Jul 15
ONT
Ontario
EWR
New York
$281 Roundtrip, found 5 hours ago
$281
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Fri, Jul 4 from Ontario to New York, returning Tue, Jul 15, priced at $281 found 5 hours ago
Alaska Airlines
Tue, Sep 23 - Wed, Sep 24
ONT
Ontario
EWR
New York
$286 Roundtrip, found 13 hours ago
$286
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Tue, Sep 23 from Ontario to New York, returning Wed, Sep 24, priced at $286 found 13 hours ago
Delta
Sat, Jul 12 - Tue, Jul 15
ONT
Ontario
EWR
New York
$287 Roundtrip, found 2 hours ago
$287
Roundtrip
found 2 hours ago
Select Delta flight, departing Sat, Jul 12 from Ontario to New York, returning Tue, Jul 15, priced at $287 found 2 hours ago
United
Fri, Sep 5 - Sat, Sep 6
ONT
Ontario
EWR
New York
$287 Roundtrip, found 1 day ago
$287
Roundtrip
found 1 day ago
Select United flight, departing Fri, Sep 5 from Ontario to New York, returning Sat, Sep 6, priced at $287 found 1 day ago
Delta
Wed, Oct 1 - Wed, Oct 8
ONT
Ontario
EWR
New York
$291 Roundtrip, found 6 hours ago
$291
Roundtrip
found 6 hours ago
Select Delta flight, departing Wed, Oct 1 from Ontario to New York, returning Wed, Oct 8, priced at $291 found 6 hours ago
Flights from Ontario (ONT) to Newark Liberty Intl. Airport (EWR)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Newark Liberty Intl. Airport
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$266
Distance
2402 mi

Ontario to Newark Liberty Intl. Airport Flights

The cheapest times to fly from Ontario to Newark Liberty Intl. Airport

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario to Newark Liberty Intl. Airport are during the month of May. You can find some of the cheapest flights from Ontario to Newark Liberty Intl. Airport with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Ontario to Newark Liberty Intl. Airport

Sunday is one of the best days to book for cheap flights from Ontario to Newark Liberty Intl. Airport: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Ontario to Newark Liberty Intl. Airport

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario to Newark Liberty Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $143 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario to Newark Liberty Intl. Airport flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario to Newark Liberty Intl. Airport airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR) cost?
Discover the latest flight deals from ONT to EWR by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from ONT to EWR?
The cheapest flights from ONT to EWR are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR)?
You can’t fly nonstop to Liberty Intl. Airport (EWR) from Ontario, CA (ONT-Los Angeles - Ontario Intl.). However, you can seamlessly travel to Newark without any layovers by taking off from Los Angeles Intl. Airport (LAX).
What is the cheapest airline that flies from ONT to EWR?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from ONT to EWR. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR)?
Nonstop flights from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR) aren’t available daily, so you’ll need to take a flight with a layover. Explore your options with Expedia’s filter tool. Enter your travel details and choose either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from ONT to EWR?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change depending on a range of factors, including the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR)?
Choose a flight from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR) last-minute?
Last-minute bookings from ONT to EWR are usually more expensive. To lock in the best rates, start looking for flights as soon as possible. That said, if you’re flexible with your travel plans, you may score a cheap ticket just before your departure.
Is it cheaper to book an ONT to EWR flight and hotel package?
Securing an ONT to EWR flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Pick from our extensive range of accommodations and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Liberty Intl. Airport (EWR)?
If you booked your ONT to EWR flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you want more information.

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*Available to One Key members.