EWR - ONT

$120 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 6/4. 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.
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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

 
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.

Recent round-trip flight deals from Newark to Ontario

KAYAK's recommended round-trip deals from the most popular airlines that fly from Newark to Ontario.
Discover the best prices for you by selecting your travel dates on KAYAK.
Alaska Airlines Logo
5:30 pm - 11:59 pmEWR-ONT
9h 29m1 stop
Alaska Airlines Logo
3:04 pm - 5:59 amONT-EWR
11h 55m1 stop
$262Alaska Airlines
Find Deal
Tue, Sep 16 - Tue, Sep 23
Alaska Airlines Logo
5:30 pm - 11:59 pmEWR-ONT
9h 29m1 stop
Alaska Airlines Logo
3:04 pm - 5:59 amONT-EWR
11h 55m1 stop
$269Alaska Airlines
Find Deal
Tue, Sep 16 - Sat, Sep 20
Delta Logo
6:00 am - 11:07 amEWR-ONT
8h 07m1 stop
Delta Logo
10:59 pm - 9:36 amONT-EWR
7h 37m1 stop
$282Delta
Find Deal
Sat, Aug 30 - Wed, Sep 3
Hawaiian Airlines Logo
7:19 am - 2:09 pmEWR-ONT
9h 50m1 stop
Hawaiian Airlines Logo
3:04 pm - 5:59 amONT-EWR
11h 55m1 stop
$286Hawaiian Airlines
Find Deal
Tue, Sep 16 - Fri, Sep 26
American Airlines Logo
6:54 am - 11:50 amEWR-ONT
7h 56m1 stop
American Airlines Logo
7:25 pm - 6:00 amONT-EWR
7h 35m1 stop
$288American Airlines
Find Deal
Sun, May 25 - Tue, Jun 3
American Airlines Logo
1:30 pm - 9:38 pmEWR-ONT
11h 08m2 stops
American Airlines Logo
6:23 am - 4:29 pmONT-EWR
7h 06m1 stop
$292American Airlines
Find Deal
Tue, Jun 10 - Wed, Jun 11
United Airlines Logo
6:00 am - 12:31 pmEWR-ONT
9h 31m1 stop
United Airlines Logo
6:39 pm - 5:37 amONT-EWR
7h 58m1 stop
$297United Airlines
Find Deal
Sat, Jun 7 - Mon, Jul 21
Delta Logo
5:30 pm - 10:29 pmEWR-ONT
7h 59m1 stop
Delta Logo
10:59 pm - 9:36 amONT-EWR
7h 37m1 stop
$302Delta
Find Deal
Tue, Aug 12 - Tue, Sep 9
United Airlines Logo
2:45 pm - 8:34 pmEWR-ONT
8h 49m1 stop
United Airlines Logo
1:45 pm - 12:58 amONT-EWR
8h 13m1 stop
$308United Airlines
Find Deal
Mon, May 12 - Wed, May 14
Hawaiian Airlines Logo
5:34 pm - 11:57 pmEWR-ONT
9h 23m1 stop
Hawaiian Airlines Logo
4:45 pm - 5:59 amONT-EWR
10h 14m1 stop
$384Hawaiian Airlines
Find Deal
Sun, May 25 - Tue, Jun 3
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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 September, where tickets cost $347 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $678 and $573 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. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

Good to know

Low seasonJanuary
High seasonAugust
Cheapest flight$120
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly and prices are also 16% 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 $120 for a one-way ticket and $262 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 $393 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 $499 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.

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 7934 reviews
7.9Entertainment
7.9Comfort
8.2Boarding
8.5Crew
7.3Food
Airline reviews

Terrible and im avoiding them in the future. My initial flight was delayed causing me to rebook my flight and when speaking with the representative to rebook I explained this is the second time my flights were delayed and they did nothing to help me. I wasn't booked to comfort plus or given a voucher or anything. I was almost late for my meeting that I needed to attend on Monday because of the games delta played delaying my flights even more and putting me in the very back of the plane next to an extremely intoxicated passenger

2.0 MediocreAnonymous, Mar 2025JFK - ATL
Read more Delta reviews

Terrible and im avoiding them in the future. My initial flight was delayed causing me to rebook my flight and when speaking with the representative to rebook I explained this is the second time my flights were delayed and they did nothing to help me. I wasn't booked to comfort plus or given a voucher or anything. I was almost late for my meeting that I needed to attend on Monday because of the games delta played delaying my flights even more and putting me in the very back of the plane next to an extremely intoxicated passenger

Although the flight left late, we arrived early. It was one of the quickest boarding and off boarding experiences I’ve had. It was kind of annoying the only drinks they had were water, coffee, and tea. The flight was very smooth, temperature was just right, and flight attendants were friendly.

Seats were really tight and the seat belts did not give enough slack.

The dear was very limited in space. I could put my water bottle in seat basket. Also, there was no inflight entertainment in the delta app?

Customer service at the gate in the flight was exceptional. On time. Aircraft and seat was decent. Thanks Delta. 💗

The WiFi has been awful on my last few Delta Air Lines flights.

The woman in seat 1A was allowed to bring a dachshund dog onboard. It smelled terrible and the odor wafted throughout the first class cabin. This was clearly not a service dog and should be prohibited. I paid for the highest class of service, and this was a disservice. Why is Delta allowing this? I may reconsider my future flight choices.

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

It was reported to the passengers that Delta failed to schedule the crew properly. This error caused the pilot to show up about 30 minutes late. All in all Delta's inability to take care of this basic function resulted in about an hour delay.

Loyal Delta traveler, but last nights flight was a train wreck. Seated in 1B after multiple delays. Then we couldn’t takeoff because of an issue with the passenger that was ‘not in compliance’ and had to deplane along with the threat if they did not deplane, all the passengers would be required to do so. Finally they were escorted off, but the experience threw off the crew. Disruptive for everyone. Service was a mess, televisions didn’t work, bathroom door kept swinging open during the entire flight whenever empty …

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.

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 ;)

The tv monitor in front of my seat was not responding. The flight crew reset it and it still didn’t work.

Maybe add a seat trade app for flyers that didn’t get seats together

There's just no way to sit fully upright and comfortably in these seats. There needs to be 2 more inches of room, and that's not something that only one person on the flight needs - the whole flight needs 2 more inches of room. If that means you sell 6 less seats, so be it. It's too close for anyone. Forcing people to pay for "premium" economy just to get "barely enough space to breathe" isn't really an answer to that.

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?!?

I was forced to check my carry-on backpack despite there being space - but it came out on the baggage carousel so fast it didn't even delay my pickup. Otherwise a good flight. Boarding began early (which was disadvantageous for me) but fine.

Delays from united along with Newark air space caused delays. But an average flight! Unfortunately we come to expect delays from the airlines.

The check-in process is not the best They should have agents in site to help with any problem especially a rebook. Why does one have to get on the phone when there were at least 8 agents around that could have help?! Flying is stressful as it is and having someone willing to do their customer service will ease some of the stress.

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.

I got bumped due to weight restrictions even tho there were empty seats on my flight. I got put on an other flight with a stopover. My flight that originally was going to take 5-6 hours ever up being 14+ hours and my luggage arrived to my destination without me because I was made to check in my luggage on my original flight when I was deemed ok to board only to be asked to deplane. Worst flight experience.

I was pleasantly surprised with an upgrade at boarding. I finally had a mostly gluten free food options and a very attentive attendant.

Staff at the gate were incredibly rude, hostile and threatening. Never fly American Airlines.

AA had a nationwide tech glitch today and after two connections snd hours of delay, I arrived 7 hours late to my destination

Flight attendant walked away once they landed and we were forced to wait another hour after an already 3hr delay.

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

My experience was okay. The flight did not offer even water without a fee. Also had to pay extra for my carry on, as I was told I had to check my bag, even though it said I had the option to carry on a bag when booking. This costed me an extra $100. Would likely not fly with Spirit again.

Seats were comfortable but dont recline at all. Checkin online was easy but didnt provide a gate until last minute. Flight attendants were very unkind, not friendly and didnt go over safety procedures in case of a crash. No free snacks or beverages, not even water.

The booking was cancelled the next day. Spirit Airlines refunded Kayak cheapflay the full amount, but I was only refunded half. Costumer service is disgusting. Be careful. You can lose your money.

Spirit airlines was extremely uncomfortable. The seats were hard.. the constant up selling (from lack of food or even water to $15 for wi fi ) was annoying. Not a recommended airlines

Our experience was not a good one. Our flight got cancelled and was not given any accommodations due to the inconvenience. We lost time on our vacation due to this inconvenience

They are very particular about size of the bag. Mine is small bag and has wheels. Bag wheel edges are bit outside of the measurements bucket. They charged $99 as carryon bagage

The plane flew smoothly and the crew was polite and kind. We loved our flight!

The senior flight attendant was engaging, funny and made everyone feel at ease. She is an asset to your team.

Terrible-extreme delay with very little communication, plane was overfull, luggage was returned on baggage claim in filthy condition.

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