HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$115+ 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
EWR — ONT
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Newark to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Newark to Ontario are usually found in September or March, booked 69 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 July 31, 2025.

Round-trip from

$255
(SmartFares)

One-way from

$115
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$367
From Newark to Ontario
Search Deals
One-way flight from Newark to Ontario
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($64 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 July 31, 2025.

This SmartFares deal was found by Cheapflights users on 7/30. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/155:48 pmEWR - ONT
1 stop9h 06mAlaska Airlines
Mon 9/223:06 pmONT - EWR
1 stop11h 53mAlaska Airlines
Deal found 7/30$255
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Wed 9/1711:25 amEWR - ONT
1 stop9h 12mUnited Airlines
Tue 9/237:00 amONT - EWR
1 stop7h 47mUnited Airlines
Deal found 7/29$262
This American Airlines deal was found by Cheapflights users on 7/30. 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.
Thu 9/47:00 amEWR - ONT
1 stop7h 56mAmerican Airlines
Wed 9/101:10 pmONT - EWR
1 stop6h 49mAmerican Airlines
Deal found 7/30$265
This Delta deal was found by Cheapflights users on 7/29. 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.
Sat 11/14:51 pmEWR - ONT
1 stop7h 29mDelta
Mon 11/105:05 pmONT - EWR
1 stop10h 05mDelta
Deal found 7/29$281
This Hawaiian Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 9/155:48 pmEWR - ONT
1 stop9h 06mHawaiian Airlines
Wed 10/226:00 amONT - EWR
1 stop9h 29mHawaiian Airlines
Deal found 7/30$290

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 July 31, 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 9/15

5:48 pm-11:54 pm

1 stop9h 06m

Ontario

Mon 9/22

3:06 pm-5:59 am

1 stop11h 53m

$255

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 9/17

11:25 am-5:37 pm

1 stop9h 12m

Ontario

Tue 9/23

7:00 am-5:47 pm

1 stop7h 47m

$262

NewarkOntario

EWR - ONT

EWRONT

Newark

Thu 9/4

7:00 am-11:56 am

1 stop7h 56m

Ontario

Wed 9/10

1:10 pm-10:59 pm

1 stop6h 49m

$265

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 9/17

12:11 pm-7:15 pm

1 stop10h 04m

Ontario

Fri 9/26

11:55 am-11:01 pm

1 stop8h 06m

$281

NewarkOntario

EWR - ONT

EWRONT

Newark

Mon 9/15

5:48 pm-11:54 pm

1 stop9h 06m

Ontario

Thu 9/25

3:06 pm-5:59 am

1 stop11h 53m

$290

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 9/17

7:00 am-9:56 pm

1 stop17h 56m

$115

NewarkOntario

EWR - ONT

EWRONT

Newark

Sun 8/31

5:48 pm-11:53 pm

1 stop9h 05m

$126

NewarkOntario

EWR - ONT

EWRONT

Newark

Sat 8/30

7:15 am-11:32 am

1 stop7h 17m

$127

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 9/17

7:19 am-2:12 pm

1 stop9h 53m

$131

NewarkOntario

EWR - ONT

EWRONT

Newark

Sat 8/30

5:40 pm-10:40 pm

1 stop8h 00m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 12 results
1
2

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 July 25, 2025.

The best time to book flights from Newark Airport to Ontario is 69 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 July 31, 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 July 31, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta, and Hawaiian 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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, Alaska Airlines ($255), United Airlines ($262), and American Airlines ($265) offers the cheapest pricing from Newark Airport to Ontario. Alaska Airlines is priced at 38% 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 ($126), American Airlines ($127), and Hawaiian Airlines ($131).

  • 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Newark to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Newark to Los Angeles flights
John F Kennedy Intl to San Francisco flights
Newark to San Francisco flights
Newark to Las Vegas flights
LaGuardia to Los Angeles flights
LaGuardia to Las Vegas flights
LaGuardia to San Francisco flights
Newark to Burbank flights
John F Kennedy Intl to Ontario flights
John F Kennedy Intl to San Diego flights
Newark to San Diego flights
Newark to Oakland flights
Newark to San Jose flights
LaGuardia to Burbank flights
LaGuardia to Santa Ana flights
Newark to Santa Ana flights
LaGuardia to Ontario flights
LaGuardia to Oakland flights
LaGuardia to San Diego flights
John F Kennedy Intl to Santa Ana flights
John F Kennedy Intl to San Jose flights
Newark to Sacramento flights
John F Kennedy Intl to Burbank flights
John F Kennedy Intl to Reno flights
John F Kennedy Intl to Sacramento flights
LaGuardia to San Jose flights
John F Kennedy Intl to Oakland flights
Newark to Palm Springs flights
Newark to Reno flights
John F Kennedy Intl to Palm Springs flights
LaGuardia to Reno flights
LaGuardia to Sacramento flights
LaGuardia to Palm Springs flights
Stewart to Las Vegas flights
Stewart to San Francisco flights
John F Kennedy Intl to Long Beach flights
John F Kennedy Intl to Santa Barbara flights
Newark to Fresno flights
John F Kennedy Intl to Fresno flights
Newark to Santa Barbara flights
LaGuardia to Santa Barbara flights
Newark to Monterey flights
John F Kennedy Intl to Monterey flights
Stewart to Los Angeles flights
LaGuardia to Fresno flights
Newark to Long Beach flights
Newark to Santa Rosa flights

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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$116Average$208FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$276Average$413FlexibilityNo cancel feeOn-time71%
DeltaCheapest$280Average$374FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$282Average$469FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.