EWR - ONT

$114 Find Cheap Flights from Newark Liberty Airport to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Newark to Ontario departing on 9/17. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Newark to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Newark to Ontario, as well as popular online travel agencies
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Cheap Flights from Newark to Ontario (EWR-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Newark to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Newark to Ontario

Sat, Nov 1 - Fri, Nov 7
Frontier Logo
11:00 am - 7:52 amEWR-ONT
23h 52m2 stops
Frontier Logo
6:53 am - 12:34 amONT-EWR
14h 41m2 stops
$231Frontier
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Fri, Nov 7 - Sun, Nov 9
Frontier Logo
11:00 am - 11:50 pmEWR-ONT
15h 50m2 stops
Frontier Logo
7:44 pm - 10:05 amONT-EWR
11h 21m2 stops
$237Frontier
Find Deal
Tue, Sep 9 - Tue, Sep 16
 Logo
5:15 am - 9:56 pmEWR-ONT
19h 41m2 stops
 Logo
8:00 am - 5:54 amONT-EWR
18h 54m1 stop
Tue, Sep 9 - Wed, Sep 10
United Airlines Logo
2:45 pm - 8:33 pmEWR-ONT
8h 48m1 stop
United Airlines Logo
6:04 am - 4:39 pmONT-EWR
7h 35m1 stop
$246United Airlines
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Wed, Oct 8 - Mon, Oct 20
 Logo
6:55 am - 7:49 amEWR-ONT
27h 54m1 stop
 Logo
8:34 am - 4:59 pmONT-EWR
29h 25m1 stop
Wed, Sep 10 - Wed, Sep 17
United Airlines Logo
1:55 pm - 8:33 pmEWR-ONT
9h 38m1 stop
United Airlines Logo
6:50 pm - 5:39 amONT-EWR
7h 49m1 stop
$251United Airlines
Find Deal
Sat, Aug 30 - Sat, Sep 6
American Airlines Logo
5:30 am - 11:52 amEWR-ONT
9h 22m1 stop
American Airlines Logo
1:10 pm - 10:59 pmONT-EWR
6h 49m1 stop
$253American Airlines
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Tue, Sep 9 - Wed, Sep 10
American Airlines Logo
8:15 am - 6:16 pmEWR-ONT
13h 01m2 stops
American Airlines Logo
10:35 pm - 9:54 amONT-EWR
8h 19m1 stop
$256American Airlines
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Tue, Sep 30 - Tue, Oct 14
Delta Logo
1:15 pm - 7:15 pmEWR-ONT
9h 00m1 stop
Delta Logo
10:00 pm - 9:36 amONT-EWR
8h 36m1 stop
$277Delta
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Tue, Oct 21 - Sat, Oct 25
Delta Logo
3:34 pm - 10:22 pmEWR-ONT
9h 48m1 stop
Delta Logo
7:05 am - 6:08 pmONT-EWR
8h 03m1 stop
$282Delta
Find Deal
Booking Insights

KAYAK's insights & trends for Newark to Ontario flights

Get data-powered insights and trends into flights from Newark to Ontario to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Newark Liberty Airport to Ontario?

The average price of all round-trip flights from Newark Airport to Ontario clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Ontario on a Tuesday and more expensive on a Sunday. On your return trip to Newark Liberty Airport, you should consider flying back on a Tuesday, and avoid Mondays for better deals.

What is the cheapest month to fly from Newark Airport to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Newark Airport to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Newark Airport to Ontario is August, where tickets cost $327 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is $721 and $461 respectively.

How far in advance should I book a flight from Newark Airport to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Newark Airport to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Newark Airport to Ontario, you should book around 2 weeks before departure, which saves you about 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonJune
Cheapest flight$114
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Newark Liberty Airport to Ontario

When to book flights from Newark to Ontario

Are your dates flexible? Find out the best times to travel from Newark to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Newark Liberty Airport to Ontario flights

  • What is the cheapest flight from Newark Airport to Ontario?

    In the last 3 days, the lowest price for a flight from Newark Airport to Ontario was $114 for a one-way ticket and $231 for a round-trip.

  • Do I need a passport to fly between Newark Liberty Airport and Ontario?

    No, a passport isn't needed to fly from Newark Liberty Airport to Ontario. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Newark Liberty Airport to Ontario?

    Newark Liberty Airport airport is called Newark and the only airport in Ontario is Ontario.

  • Which aircraft models fly most regularly from Newark Liberty Airport to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Newark Liberty Airport to Ontario?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Newark Liberty Airport and Ontario, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Newark to Ontario, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Newark to Ontario are Delta and United Airlines. With an average price for the route of $374 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $426 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Newark Liberty Airport to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Newark Liberty Airport to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Newark Liberty Airport to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Newark Liberty Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Newark Liberty Airport to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Newark Liberty Airport with another airline. Booking your flights between Newark Liberty Airport and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Newark Liberty Airport to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Newark Liberty Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Newark to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Newark to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Newark to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7982 reviews
8.5Crew
8.2Boarding
7.3Food
7.9Entertainment
7.9Comfort
Airline reviews

I believe that a four-hour trip should have a meal. Delta had none.

8.0 ExcellentPolycarp, Aug 2025JFK - SLC
Read more Delta reviews

I believe that a four-hour trip should have a meal. Delta had none.

Was charged for my luggage despite having been on one ticket from an international flight. Too tired to argue after 15 hours on flight. Was charged for rechecking it at JFK airport. Not sure why those off Kenya Airways were required to do that.

Great experience on Delta. Staff from baggage check to flight attendants were very courteous and professional. My only issue was a personal preference for pretzels instead of the chips and cookies that were offered.

Flight was canceled, and no effort was made to help with rebooking, no hotel vouchers, no car transportation and minimal food voucher and most places for food were closed by the time the voucher was given. Waited for 3 hours for bags. Simply the worst travel experience I have ever had

At first, we were on the runway for about an hour, literally. The Captain did explain that the Control Tower just had a change shift (sounds like an unrealistic excuse) and then that we had to change a runway. A regular economy seat is made for 12 yo twiggy. I understand Delta wants to push for an upgrade, but after sitting in a Comfort seat and in First class. I would say First class is not worthy of my money. The landing was delayed because of the weather in NYC, I don't hold that against Delta, of course. The Captain did alert us to that upon takeoff in Vegas and again as we reached NY.

Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

My flight was 6 pm 6/6. Every hour they delayed it again - air condition issues then no pilot then the crew had worked too many hours and cancelled the flight at 11 pm. Sent customers to NJ a 45 minutes uber ride to a hotel. Had to be back by 5 am for a 7 am flight and again no pilot etc with another three hours of delays.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

This flight was perfect. No complaints and only the highest regard for the crew and ground staff and how they executed perfectly. I fly a lot with United and would request predictability and transparency in their operations instead of last minute changes.

Survey sent before we actually left. Delay after delay. Now a crew problem.

I love flying with United. Unfortunately, I flew on an older plane with minimal upgraded technology (no Bluetooth functionality or handy charging ports). Otherwise, the flight was great and even arrived early.

They changed my seats after I checked in and I was stressed from the time I saw that information until just before boarding, when the gate attendant fixed it, but it shouldn't have happened. And if it couldn't be prevented, then the people on the phone I spoke with should have done something to help, which they did not, nor did they offer me compensation, just meaningless apologies.

Smooth flight, especially take off and landing, and great crew on board. Really loved the stroopwaffles!

Deplaning was delayed because of Jetbridge equipment issues in MKE, causing an issue on an otherwise great flight.

Not really their fault, but a 4.5 hour delay is pretty brutal

we were delayed going into and out of Newark Airport by 3-4 hours each way. Excuses/reasons given were misleading. Weather was cited at first when there was NO weather issue. Turns out Newark had a shortage of staff and runway construction. United knew this and should have NOT scheduled flights when they know we would be delayed so long. I will avoid United and EWR airport at all cost going forward. Delta never looked so good.

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

leg space better than expected. two washrooms for one plane isn't enough.

The comfort of the seats was great, the crew eased my child’s anxieties and the fact that I had full cans of my beverage choice was great.

My flight got switched and my prepaid bag didnt transfer over properly so I paid to check ANOTHER BAG. I was placed in a middle seat and it was just miserable. At least it was a bulkhead row so I had legroom. The flight just never seem3d to end

This was a horrible experience. For a first class experience, my chair was held together by 3M tape - and I have a photo. The crew weren’t very attentive, somewhat dismissive and forgot my drink and snack, the chair reclined about 3 inches on a 6-hour cross country flight. I was also not informed that there was no lounge available in Newark airport because of renovations, so all around this was one of the worst experiences and I would actively avoid both American and Alaska Air going forward.

I’m impressed that we were on time in Sacramento after having a late departure in Newark and our made it. The staff was friendly and warm.

Waited on the runway for takeoff for 2.5 hours. Air traffic rerouted us. The plane didn't have enough fuel, so had to go back to the gate. Had to wait for a new pilot. Should have landed at 5:22. Didn't land until 9:10. Trash flight.

There were five broken seats on the plane. The crew was very rude in telling people they had to get off the plane and get a flight the next day. No call for volunteers, but telling people they had to get off. One woman was flying with her elderly mother and daughter and was told she had to leave or all three had to leave. Fortunately, a volunteer offered to stay. The situation was handled poorly.

Delays on all NY flights. There was no communication on why but they didn’t say it was weather. Other carriers were not delayed.

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

They cancelled our flight without warning OR a refund. Never doing business with American Airlines again! This is the second AA booked trip in a row that we've had challenges with.

It was so bad it will be my last. Connecting flight gate agent closed the door in my face when i told her my husband is 30 seconds away (and we were running close/late because the preceding AA flight was slightly delayed. We had to be rebooked on a non-direct flight with an overnight layover in Phoenix. This is the worst experience ever and for no fault of our own. The flight we were trying to get on would not have been late if the gate agent allowed my husband to get there. It was senseless, cruel and very upsetting. I don’t understand why we were subjected to this.

After 2 hrs the flight was canceled. The next flight wasn’t until 4 days away! They wouldn’t book us with other airlines. We ended up driving 15 hrs to get home

First time on Spirit. Definitely a streamline flight but I would fly Spirit again.

The seat belt was lengthy enough that I did not need an extender. Courteous and helpful flight attendants.

Not very good because of an almost 3 hour delay for an hour long flight.

We had an almost 7 hour flight delay. We left the gate twice and taxi-ed and then returned the gate twice. Finally we got a new flight crew (our third one) and then left the gate to the final time before departing at 6:45pm (original flight time was 12pm). Out of Newark.

you guys canceled my flight last minute and lost my luggage.

Unprepared for the very expensive carry-on cost. Still was our best option since it was a direct flight and the best times.

My flight got cancelled by Spirit airlines, it was bad experience to me

It was a short fight and even though we had a delay due to weather we arrived on time

Flight was delayed a bit, but that was expected (and updated), so really not bad at all for the price. Could’ve used one less email asking me to upgrade my seat; otherwise no significant complaints

Everything you need to know for your flight from Newark to Ontario

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