EWR - ONT

$157 Find Cheap Flights from Newark Liberty Airport to Ontario - Compare and Save

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 9/22. 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, 0 bags

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Everything you should know

Cheapest round-trip
$331
Typical prices: $296-$552
Frontier
Tue 9/15Tue 9/29
EWR - ONT • 1 stop
Cheapest one-way
$157
Typical prices: $188-$223
Frontier
Tue 9/22
EWR - ONT • 1 stop
Top airlines
Cheapest • from $331 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Newark and Ontario. You'll need at least 1 connection.
Insights
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Top layover airports
Cheapest • Avg $394 (round-trip)
Shortest trip • 8h 06m (one-way)
Insights
Insights
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Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 17% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
+1
+1
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Good to know
+1
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Flight Deals
Booking Insights
Flight Deals

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

Tue, Sep 15 - Tue, Sep 29
Frontier Logo
1:30 pm - 7:12 am
EWR
-
ONT
20h 42m
1 stop
Frontier Logo
8:07 am - 12:27 pm
ONT
-
EWR
25h 20m
1 stop
$331Frontier
Tue, Sep 15 - Sat, Oct 3
Frontier Logo
1:30 pm - 7:12 am
EWR
-
ONT
20h 42m
1 stop
Frontier Logo
2:55 pm - 12:59 am
ONT
-
EWR
31h 04m
2 stops
$345Frontier
Tue, Sep 15 - Thu, Oct 1
Frontier Logo
1:30 pm - 7:12 am
EWR
-
ONT
20h 42m
1 stop
Frontier Logo
2:55 pm - 10:27 am
ONT
-
EWR
16h 32m
2 stops
$346Frontier
Tue, Sep 15 - Mon, Sep 28
Frontier Logo
1:30 pm - 7:12 am
EWR
-
ONT
20h 42m
1 stop
Frontier Logo
11:38 am - 12:27 pm
ONT
-
EWR
21h 49m
2 stops
$348Frontier
Tue, Jul 28 - Tue, Aug 18
Frontier Logo
10:29 pm - 11:50 pm
EWR
-
ONT
28h 21m
2 stops
Frontier Logo
9:37 am - 12:31 pm
ONT
-
EWR
23h 54m
1 stop
$350Frontier
Sat, Aug 15 - Tue, Aug 25
Frontier Logo
1:35 pm - 11:50 pm
EWR
-
ONT
13h 15m
2 stops
Frontier Logo
9:37 am - 12:31 pm
ONT
-
EWR
23h 54m
1 stop
$352Frontier
Mon, Sep 14 - Tue, Sep 29
Frontier Logo
10:29 pm - 1:57 pm
EWR
-
ONT
18h 28m
2 stops
Frontier Logo
8:07 am - 12:27 pm
ONT
-
EWR
25h 20m
1 stop
$357Frontier
Wed, Sep 16 - Tue, Sep 29
Frontier Logo
1:30 pm - 10:21 am
EWR
-
ONT
23h 51m
2 stops
Frontier Logo
8:07 am - 12:27 pm
ONT
-
EWR
25h 20m
1 stop
$360Frontier
Tue, Sep 15 - Wed, Sep 30
Frontier Logo
1:30 pm - 7:12 am
EWR
-
ONT
20h 42m
1 stop
Frontier Logo
8:07 am - 12:27 pm
ONT
-
EWR
25h 20m
1 stop
$363Frontier
Tue, Sep 15 - Wed, Sep 30
Frontier Logo
1:30 pm - 7:12 am
EWR
-
ONT
20h 42m
1 stop
Frontier Logo
2:58 pm - 10:27 am
ONT
-
EWR
16h 29m
2 stops
$365Frontier
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.

How much is a round-trip flight from Newark Airport to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Newark Airport to Ontario departing in September.

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 $330 (return) on average. On the other hand, the most expensive months are June and February, where the average cost of round-trip tickets is $633 and $536 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 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$157
Best time to beat the crowds but there is an average 22% increase in price.
Most popular time to fly with an average 44% increase in price.
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 5 days, the lowest price for a flight from Newark Airport to Ontario was $157 for a one-way ticket and $331 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?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between Newark Liberty Airport and Ontario, with SkyTeam 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 $418 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $540 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 3 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.
7.8
DeltaOverall score based on 8453 reviews
8.5Crew
7.8Entertainment
8.1Boarding
7.8Comfort
7.2Food
Airline reviews

WiFi didn’t work most of the time. The usb chargers would work only occasionally for 5 mins and wouldn’t charge after that. Had to keep trying repeatedly at each of the seats in the row.

6.0 GoodLakshmi, Apr 2026
JFK - SFO
Read more Delta reviews

WiFi didn’t work most of the time. The usb chargers would work only occasionally for 5 mins and wouldn’t charge after that. Had to keep trying repeatedly at each of the seats in the row.

The crew bent over backwards to thank us for flying and make us comfortable. The food service was quick and efficient. The Captain communicated and said goodbye and thank you as we departed. They really stood out!

my mom urmila patel needed a wheelchair which was not available on the curbside. she needed to walk almost 50 meters inside (at the risk of falling) and then had to wait in line to get a wheelchair (this is not ok). Once obtained she had to seat in it for 30-45 minutes for someone to take her in thru the checkin process (which was fairly smooth and easy). the lady who helped her with her checkin process was very courteous and helpful

There’s not much to say about a one hour flight. This is a connection from LA to RNO that I missed the previous night due to a mechanical check delay on my originating flight from JFK to LAX. The short flight itself was fine. Instructions from the pilot and crew were per usual. The coffee was barely lukewarm, which possibly was purposeful so we would down it quickly. Bags were already on carousel upon reaching baggage claim, which was excellent.

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

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.

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.

I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us

Only one side of the heafphone jack work. Crew was friendly and helpful.

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

Generally good. The aisles have gotten narrower which can slow down boarding. Flight crew was great! Healthier complimentary snacks would be appreciated. Due to earthquake in San Francisco we had to circle in air space for a bit but then had a smooth landing. I laud the flight crew for their patience ;)

Everything good until we waited for jet bridge at SFO. Then pilot gets on speaker & said it won’t reach plane- too short, need to go to different gate. Then 5 min later, adjusted plane/jetbridge & all ok?!?

Haven’t used United in a while. Was surprised with the free blanket and earphones. Service was great. Huge plane. 9/.row.

Boarding was efficient. Crew was not pleasant and skipped me during a round of beverage service. Older plane with no seat back screens and I couldn’t connect to wifi or their entertainment offerings.

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Delays, excuses, delays, and more delays. This company is BROKEN.

The in-flight entertainment options were great. I always appreciate a seat back TV on a domestic flight. However, there were issues with a computer system that were discovered after we had boarded that caused repeated delays, and eventually we had to deplane. I liked that United texted me a $30 food voucher for the inconvenience, but it caused me to miss my dinner plans in West Hollywood that night. Once we were in the air, everything was fine though.

The flight attendant was very polite and attentive. The food was good.

Wifi was spotty. Tray table was very dirty when I sat down.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Amazing I love American. I’ll never fly anyone else if I can help it.

Great. Quick and quiet and east. The breakfast choices were a welcome surprise!

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.

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

Everything was great except for the wifi was junk. Crew was super friendly and helpful

Nothing really nondescript, the flight attendants were friendly and helpful.

It was fine. I didn't love the food but it was at least a real attempt at serving a meal, unlike my earlier flight from Nashville to Dallas.

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

Information on your arrival and departure airports