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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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
EWR — ONT
Apr 14 — Apr 211
Tue 4/14
Tue 4/21
1 adult, Economy
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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 March 15, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/14. 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 4/282:55 pm
EWR
-
ONT
1 stop22h 49m
Multiple Airlines
Tue 5/51:50 pm
ONT
-
EWR
1 stop14h 12m
Multiple Airlines
Deal found 3/14$241
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 4/1310:29 pm
EWR
-
ONT
2 stops23h 20m
Multiple Airlines
Wed 4/227:44 pm
ONT
-
EWR
1 stop8h 18m
Multiple Airlines
Deal found 3/13$242
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/202:55 pm
EWR
-
ONT
1 stop22h 49m
Multiple Airlines
Wed 4/227:44 pm
ONT
-
EWR
1 stop8h 18m
Multiple Airlines
Deal found 3/11$248
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 4/1410:15 pm
EWR
-
ONT
1 stop15h 29m
Multiple Airlines
Thu 4/167:49 pm
ONT
-
EWR
1 stop7h 41m
Multiple Airlines
Deal found 3/15$250
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 4/272:55 pm
EWR
-
ONT
1 stop22h 49m
Multiple Airlines
Mon 5/48:59 pm
ONT
-
EWR
1 stop31h 03m
Multiple Airlines
Deal found 3/13$253
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/155:59 am
EWR
-
ONT
2 stops15h 50m
Multiple Airlines
Mon 4/2011:44 am
ONT
-
EWR
1 stop15h 46m
Multiple Airlines
Deal found 3/10$256
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/86:55 am
EWR
-
ONT
2 stops20h 01m
Multiple Airlines
Wed 4/157:44 pm
ONT
-
EWR
1 stop8h 18m
Multiple Airlines
Deal found 3/12$257
This Kiwi.com deal was found by Cheapflights users on 3/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/72:00 pm
EWR
-
ONT
2 stops36h 56m
Multiple Airlines
Tue 4/147:44 pm
ONT
-
EWR
1 stop8h 11m
Multiple Airlines
Deal found 3/11$261
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 4/69:00 pm
EWR
-
ONT
2 stops29h 56m
Multiple Airlines
Wed 4/157:44 pm
ONT
-
EWR
1 stop8h 18m
Multiple Airlines
Deal found 3/12$263

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 March 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$241
(Kiwi.com)

One-way from

$110
(Trip.com)

Popular in

February

Cheapest in

September

Average price

$372
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. 4% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 15, 2026.
Use the filters below to find and compare flights from Newark Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 4/15

3:30 pm-11:59 pm

1 stop11h 29m

Ontario

Tue 4/28

10:39 am-11:29 pm

1 stop9h 50m

$378

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 4/16

3:30 pm-11:59 pm

1 stop11h 29m

Ontario

Tue 4/21

7:00 am-6:29 pm

1 stop8h 29m

$407

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 4/30

5:33 pm-11:48 pm

1 stop9h 15m

Ontario

Mon 5/4

3:26 pm-6:39 am

1 stop12h 13m

$408

NewarkOntario

EWR - ONT

EWRONT

Newark

Tue 5/5

7:29 am-2:32 pm

1 stop10h 03m

Ontario

Thu 5/7

3:26 pm-6:29 pm

2 stops24h 03m

$436

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 5/14

2:36 pm-10:35 pm

1 stop10h 59m

Ontario

Tue 5/19

6:00 am-6:20 pm

1 stop9h 20m

$463
Quickest round-trip

NewarkOntario

EWR - ONT

EWRONT

Newark

Fri 5/29

11:55 am-5:28 pm

1 stop8h 33m

Ontario

Mon 6/1

6:30 pm-5:40 am

1 stop8h 10m

$469

NewarkOntario

EWR - ONT

EWRONT

Newark

Sat 5/9

5:33 pm-11:48 pm

1 stop9h 15m

Ontario

Sat 5/16

6:00 am-11:59 pm

1 stop14h 59m

$481

NewarkOntario

EWR - ONT

EWRONT

Newark

Mon 5/11

2:36 pm-10:35 pm

1 stop10h 59m

Ontario

Sat 5/16

6:00 am-6:20 pm

1 stop9h 20m

$482

NewarkOntario

EWR - ONT

EWRONT

Newark

Sat 5/9

6:00 am-5:52 pm

2 stops14h 52m

Ontario

Tue 5/12

6:59 pm-11:50 am

2 stops13h 51m

$496

NewarkOntario

EWR - ONT

EWRONT

Newark

Mon 3/23

4:55 pm-11:59 pm

1 stop10h 04m

Ontario

Tue 3/31

6:00 am-6:29 pm

1 stop9h 29m

$497

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Newark Airport-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 March 13, 2026.

The best time to book flights from Newark Airport to Ontario is 33 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 $90). Flying from Newark Airport to Ontario in March is currently the most expensive (average of $174). 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.

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 March 15, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican 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
8,293 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

Food

7.2

Entertainment

7.8

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
8,293 reviews
Delta
7.9
Good
8,293 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

Food

7.2

Entertainment

7.8

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
9,427 reviews
Delta
7.9
Good
8,293 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

Food

7.2

Entertainment

7.8

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
7.1
Good
11,472 reviews
Delta
7.9
Good
8,293 reviews

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.9

Food

7.2

Entertainment

7.8

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 3 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 $463, Alaska Airlines can have you in Ontario from Newark Airport in 10h 59m. 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, American Airlines ($271), Delta ($276), and United Airlines ($286) offers the cheapest pricing from Newark Airport to Ontario. American Airlines is priced at 33% 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 Spirit Airlines ($97), United Airlines ($128), and Alaska Airlines ($128).

  • 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 $90). Flying from Newark Airport to Ontario in March is currently the most expensive (average of $174). 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 3 airlines flying from Newark to Ontario

Discover the top 3 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 March 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$271Average$355FlexibilityNo cancel feeOn-time71%
DeltaCheapest$276Average$432FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$286Average$425FlexibilityNo cancel feeOn-time69%

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