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$91+ Cheap flights from Newark (EWR) to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
EWR — ONT
Jan 7 — Jan 141
Wed 1/7
Wed 1/14
1 adult, Economy
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Cheapflights Tip: The best prices from Newark to Ontario are usually found in September or August, booked 20 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Newark to Ontario

Cheapest flights from Newark to Ontario
Explore the most affordable flight options available from Newark to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 8, 2025.

This Delta deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/157:00 pmEWR - ONT
1 stop7h 58mDelta
Thu 1/812:41 pmONT - EWR
1 stop7h 20mDelta
Deal found 12/8$370
This Kiwi.com deal was found by Cheapflights users on 12/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/176:49 pmEWR - ONT
1 stop25h 33mMultiple Airlines
Mon 12/226:00 pmONT - EWR
2 stops35h 00mMultiple Airlines
Deal found 12/7$388
This United Airlines deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/164:08 pmEWR - ONT
1 stop8h 41mUnited Airlines
Thu 12/186:04 amONT - EWR
1 stop9h 05mUnited Airlines
Deal found 12/8$407
This American Airlines deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/157:07 amEWR - ONT
2 stops11h 55mAmerican Airlines
Wed 12/1712:55 pmONT - EWR
1 stop7h 17mAmerican Airlines
Deal found 12/8$412
This KAYAK deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/165:49 pmEWR - ONT
1 stop8h 15mDelta
Thu 12/1812:12 pmONT - EWR
1 stop7h 51mDelta
Deal found 12/8$434
This Kiwi.com deal was found by Cheapflights users on 12/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/205:50 amEWR - ONT
2 stops28h 34mMultiple Airlines
Mon 1/58:14 amONT - EWR
1 stop27h 40mMultiple Airlines
Deal found 12/7$447
This United Airlines deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/264:00 pmEWR - ONT
1 stop8h 07mUnited Airlines
Sat 1/35:05 amONT - EWR
1 stop7h 39mUnited Airlines
Deal found 12/8$460
This Kiwi.com deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/225:41 pmEWR - ONT
2 stops16h 43mMultiple Airlines
Mon 1/58:14 amONT - EWR
1 stop27h 40mMultiple Airlines
Deal found 12/8$461
This United Airlines deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/156:00 amEWR - ONT
1 stop9h 17mUnited Airlines
Tue 1/68:00 amONT - EWR
1 stop10h 19mUnited Airlines
Deal found 12/8$470
This United Airlines deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/264:00 pmEWR - ONT
1 stop8h 07mUnited Airlines
Sun 1/46:39 pmONT - EWR
1 stop8h 20mUnited Airlines
Deal found 12/8$472

Find flight deals from Newark to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Newark (EWR) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 8, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$249
(Kiwi.com)

One-way from

$91
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$510
Provider with most accurate pricing for Newark-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Newark-Ontario flights.
Search Deals
From Newark to Ontario
Search Deals
One-way flight from Newark to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($43 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Newark to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 8, 2025.
Use the filters below to find and compare flights from Newark Airport to Ontario that are best for you.

Fly from

Newark

Fly to

Ontario

Route

Depart

Return

Price

NewarkOntario

EWR - ONT

EWRONT

Newark

Mon 3/16

5:30 pm-11:52 pm

1 stop9h 22m

Ontario

Tue 3/31

6:00 am-6:56 pm

1 stop9h 56m

$332

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 1/8

6:00 am-11:31 am

1 stop8h 31m

Ontario

Tue 1/13

10:30 pm-10:58 am

1 stop9h 28m

$333

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 1/22

3:30 pm-9:58 pm

1 stop9h 28m

Ontario

Wed 2/4

1:24 pm-11:30 pm

1 stop7h 06m

$333

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 4/1

6:00 am-11:35 am

1 stop8h 35m

Ontario

Wed 4/8

1:20 pm-11:58 pm

1 stop7h 38m

$333

NewarkOntario

EWR - ONT

EWRONT

Newark

Mon 2/2

4:36 pm-11:56 pm

1 stop10h 20m

Ontario

Sun 2/8

6:00 am-6:24 pm

1 stop9h 24m

$349

NewarkOntario

EWR - ONT

EWRONT

Newark

Mon 3/9

7:29 pm-11:52 pm

2 stops31h 23m

Ontario

Mon 3/16

6:14 am-6:28 pm

1 stop9h 14m

$354

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 2/19

5:30 pm-11:52 pm

1 stop9h 22m

Ontario

Sat 2/21

7:00 am-6:59 pm

1 stop8h 59m

$382

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 1/8

4:36 pm-11:56 pm

1 stop10h 20m

Ontario

Tue 1/13

4:03 pm-6:24 pm

1 stop23h 21m

$397

NewarkOntario

EWR - ONT

EWRONT

Newark

Sun 4/5

6:00 am-11:35 am

1 stop8h 35m

Ontario

Thu 4/16

5:05 pm-6:08 am

1 stop10h 03m

$419

NewarkOntario

EWR - ONT

EWRONT

Newark

Sat 1/17

3:29 pm-8:58 pm

1 stop8h 29m

Ontario

Tue 1/20

8:00 am-9:19 pm

1 stop10h 19m

$433

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 22 results
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2
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Compare providers for flights from Newark to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Newark to Ontario in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Newark Airport-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Newark Airport-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Newark Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Newark Airport-Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Newark Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Newark to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Newark with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Newark Airport to Ontario

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

Use this chart to determine the optimal time to book a round-trip flight from Newark to Ontario. Price data was last updated on December 5, 2025.

The best time to book flights from Newark Airport to Ontario is 20 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Newark Airport to Ontario?

Currently, December is the cheapest month in which you can book a flight from Newark Airport to Ontario (average of $84). Flying from Newark Airport to Ontario in January is currently the most expensive (average of $144). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from EWR to ONT?

Find hourly flight availability from Newark to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 8, 2025.

It’s optimal to fly from Newark Airport to Ontario in the evening. By choosing this option you can save up to 38% on the cost of your flight, compared to a flight in the afternoon.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated December 8, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from Newark Airport to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,013 reviews

Boarding

8.1

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kymberlee,Oct 2024

JFK - ATL

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.
Delta
7.9
Good
8,013 reviews
Delta
7.9
Good
8,013 reviews

Boarding

8.1

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kymberlee,Oct 2024

JFK - ATL

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.
United Airlines
7.4
Good
9,076 reviews
Delta
7.9
Good
8,013 reviews

Boarding

8.1

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kymberlee,Oct 2024

JFK - ATL

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.
American Airlines
7.2
Good
11,042 reviews
Delta
7.9
Good
8,013 reviews

Boarding

8.1

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kymberlee,Oct 2024

JFK - ATL

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.
Spirit Airlines
6.3
Okay
8,169 reviews
Delta
7.9
Good
8,013 reviews

Boarding

8.1

Crew

8.5

Overall

7.9

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kymberlee,Oct 2024

JFK - ATL

Overall it was good on the flight. Before the flight with checking the bag at JFK was a nightmare. It took way too long and the Delta concierge was very rude to everyone. But other than that it was fine.

Related info for your journey

Find useful and relevant information for your journey from Newark to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Newark?

    Ontario (ONT) is the airport you will fly into if you book a flight from Newark to Ontario. You should not have trouble finding flights to Ontario from Newark; the airport handles an average of 0 inbound flights from Newark per day. You should also have plenty of airline options to choose from since 4 airlines have flights to the Ontario airport from Newark. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

  • What are the cheapest airlines flying from Newark Airport to Ontario round-trip?

    According to our current data, Spirit Airlines ($116), American Airlines ($276), and Delta ($276) offers the cheapest pricing from Newark Airport to Ontario. Spirit Airlines is priced at 69% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Newark Airport to Ontario one-way?

    The cheapest airlines for a one-way flight from Newark Airport to Ontario are Alaska Airlines ($91), United Airlines ($128), and American Airlines ($133).

  • Can I find deals for flights from Newark to Ontario that include hotel bookings?

    Yes. In addition to deals on Newark to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Newark to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Newark to Ontario.

  • Can I find deals for business class flights from Newark to Ontario?

    Yes. Cheapflights offers flight deals from Newark to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, December is the cheapest month in which you can book a flight from Newark Airport to Ontario (average of $84). Flying from Newark Airport to Ontario in January is currently the most expensive (average of $144). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Newark to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Newark to Ontario

Discover the top 4 airlines that operate flights from Newark to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$116Average$184FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$276Average$373FlexibilityNo cancel feeOn-time71%
DeltaCheapest$276Average$417FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$280Average$377FlexibilityNo cancel feeOn-time69%

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