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$110+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
EWR — ONT
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Newark to Ontario are usually found in August or September, booked 38 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap 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 September 11, 2025.

Round-trip from

$227
(American Airlines)

One-way from

$110
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$347
From Newark to Ontario
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One-way flight from Newark to Ontario
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Highest demand for flights based on searches. 17% potential increase in price ($84 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This American Airlines deal was found by Cheapflights users on 9/9. 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.
Wed 10/297:15 amEWR - ONT
1 stop7h 46mAmerican Airlines
Fri 10/3110:09 amONT - EWR
1 stop9h 57mAmerican Airlines
Deal found 9/9$227
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/111:00 amEWR - ONT
2 stops15h 50mFrontier
Fri 11/74:05 pmONT - EWR
2 stops15h 25mFrontier
Deal found 9/10$230
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3011:26 amEWR - ONT
2 stops23h 03mFrontier
Fri 11/74:05 pmONT - EWR
2 stops15h 25mFrontier
Deal found 9/10$231
This Frontier deal was found by Cheapflights users on 9/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:30 amEWR - ONT
2 stops15h 20mFrontier
Mon 11/176:53 amONT - EWR
2 stops14h 41mFrontier
Deal found 9/10$238
This CheapOair deal was found by Cheapflights users on 9/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1311:30 amEWR - ONT
2 stops22h 59mFrontier
Sun 11/164:15 pmONT - EWR
2 stops29h 19mFrontier
Deal found 9/11$242
This Alaska Airlines deal was found by Cheapflights users on 9/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/287:30 amEWR - ONT
1 stop10h 47mAlaska Airlines
Tue 11/44:11 pmONT - EWR
1 stop10h 48mAlaska Airlines
Deal found 9/8$246
This United Airlines deal was found by Cheapflights users on 9/10. 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 9/307:50 amEWR - ONT
1 stop10h 12mUnited Airlines
Tue 10/71:15 pmONT - EWR
1 stop7h 16mUnited Airlines
Deal found 9/10$247
This Hawaiian Airlines deal was found by Cheapflights users on 9/11. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/297:30 amEWR - ONT
1 stop10h 47mHawaiian Airlines
Sat 11/14:11 pmONT - EWR
1 stop11h 48mHawaiian Airlines
Deal found 9/11$248
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Sat 11/810:20 amEWR - ONT
1 stop8h 41mAmerican Airlines
Tue 11/1812:55 pmONT - EWR
1 stop7h 17mAmerican Airlines
Deal found 9/10$249
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Tue 10/146:59 amEWR - ONT
1 stop16h 43mMultiple Airlines
Tue 10/217:04 amONT - EWR
2 stops15h 02mMultiple Airlines
Deal found 9/9$250
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/304:25 pmEWR - ONT
1 stop10h 07mAlaska Airlines
Tue 11/44:11 pmONT - EWR
1 stop10h 48mAlaska Airlines
Deal found 9/9$251

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 September 11, 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

Wed 10/29

7:30 am-3:17 pm

1 stop10h 47m

Ontario

Fri 10/31

6:00 am-6:29 pm

1 stop9h 29m

$247

NewarkOntario

EWR - ONT

EWRONT

Newark

Fri 10/3

3:52 pm-9:24 pm

1 stop8h 32m

Ontario

Wed 10/15

6:27 pm-5:40 am

1 stop8h 13m

$252

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 10/22

4:29 pm-12:03 am

1 stop10h 34m

Ontario

Wed 10/29

6:00 am-6:29 pm

1 stop9h 29m

$276

NewarkOntario

EWR - ONT

EWRONT

Newark

Tue 10/28

7:30 am-3:17 pm

1 stop10h 47m

Ontario

Wed 11/5

6:00 am-6:29 pm

1 stop9h 29m

$281

NewarkOntario

EWR - ONT

EWRONT

Newark

Sun 10/5

8:20 am-12:51 pm

1 stop7h 31m

Ontario

Wed 10/15

6:27 pm-5:40 am

1 stop8h 13m

$283

NewarkOntario

EWR - ONT

EWRONT

Newark

Sun 11/9

7:30 am-3:17 pm

1 stop10h 47m

Ontario

Sat 11/15

6:00 am-6:29 pm

1 stop9h 29m

$298

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 11/6

4:53 pm-11:56 pm

1 stop10h 03m

Ontario

Sun 11/16

6:00 am-6:29 pm

1 stop9h 29m

$301

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 10/15

4:29 pm-12:03 am

1 stop10h 34m

Ontario

Wed 10/22

6:00 am-6:29 pm

1 stop9h 29m

$306

NewarkOntario

EWR - ONT

EWRONT

Newark

Fri 10/3

5:48 pm-11:54 pm

1 stop9h 06m

Ontario

Tue 10/21

7:10 am-5:59 am

2 stops19h 49m

$315

NewarkOntario

EWR - ONT

EWRONT

Newark

Fri 12/5

6:52 pm-11:59 pm

1 stop8h 07m

Ontario

Tue 12/9

11:45 am-11:07 pm

1 stop8h 22m

$322

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 23 results
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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 August 29, 2025.

The best time to book flights from Newark Airport to Ontario is 38 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, August is the cheapest month in which you can book a flight from Newark Airport to Ontario (average of $246). Flying from Newark Airport to Ontario in March is currently the most expensive (average of $328). 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 September 11, 2025.

It’s optimal to fly from Newark Airport to Ontario in the evening. By choosing this option you can save up to 39% 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 September 11, 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
8.0
Very good
7,960 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
8,023 reviews
Delta
8.0
Very good
7,960 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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.

  • How long is the flight from Newark Airport to Ontario?

    For as low as $252, Alaska Airlines can have you in Ontario from Newark Airport in 8h 32m. The distance from Newark Airport to Ontario is about 2401 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, Spirit Airlines ($116), American Airlines ($274), and Delta ($281) offers the cheapest pricing from Newark Airport to Ontario. Spirit Airlines is priced at 72% 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 ($124), United Airlines ($129), and Delta ($139).

  • 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, August is the cheapest month in which you can book a flight from Newark Airport to Ontario (average of $246). Flying from Newark Airport to Ontario in March is currently the most expensive (average of $328). 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$116Average$262FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$274Average$404FlexibilityNo cancel feeOn-time71%
DeltaCheapest$281Average$376FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$282Average$411FlexibilityNo cancel feeOn-time69%

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