HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
California

$31+ Cheap flights from Ontario (ONT) to California

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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to California 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.

Cheap flight deals from Ontario to California

Keep the following information in mind while searching for Ontario to California flight deals. Data was last updated January 8, 2026.

Round-trip from

$59
(CheapOair)

One-way from

$31
(Frontier)

Good round-trip deal

$234 or less

Good one-way deal

$113 or less
From Ontario to California
Search Deals
One-way flight from Ontario to California
Search Deals
Price to beat on a round-trip flight from Ontario to California.
Search Deals
Price to beat on a one-way flight from Ontario to California.
Search Deals

Find flight deals from Ontario to California

Cheapest flights from Ontario to California
Explore the most affordable flight options available from Ontario to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 8, 2026.

This Frontier deal was found by Cheapflights users on 1/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/293:22 pmONT - LAS
Nonstop1h 12mFrontier
Mon 2/211:00 amLAS - ONT
Nonstop1h 10mFrontier
Deal found 1/7$59
This Agoda.com deal was found by Cheapflights users on 1/5. 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 Agoda.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/273:07 pmONT - LAS
Nonstop1h 12mFrontier
Thu 1/296:45 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 1/5$60
This CheapOair deal was found by Cheapflights users on 1/5. 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.
Mon 2/236:43 pmONT - LAS
Nonstop1h 09mFrontier
Mon 3/24:39 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 1/5$61
This Super.com deal was found by Cheapflights users on 1/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/293:22 pmONT - LAS
Nonstop1h 12mFrontier
Sat 1/3112:23 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 1/6$62
This Frontier deal was found by Cheapflights users on 1/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/148:09 pmONT - LAS
Nonstop1h 08mFrontier
Mon 2/164:39 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 1/7$63
This CheapOair deal was found by Cheapflights users on 1/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/308:48 pmONT - LAS
Nonstop1h 08mFrontier
Mon 2/26:02 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 1/7$64
This deal was found by Cheapflights users on 1/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/302:28 pmONT - LAS
Nonstop1h 14mFrontier
Mon 3/212:00 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 1/7$65
This CheapOair deal was found by Cheapflights users on 1/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/197:22 pmONT - LAS
Nonstop1h 09mFrontier
Mon 2/2312:00 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 1/7$66
This Super.com deal was found by Cheapflights users on 1/8. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/3010:18 amONT - LAS
Nonstop1h 13mFrontier
Sun 2/18:10 amLAS - ONT
Nonstop1h 08mFrontier
Deal found 1/8$67
This Frontier deal was found by Cheapflights users on 1/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/142:06 pmONT - LAS
Nonstop1h 14mFrontier
Sun 2/1512:00 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 1/7$68
This Super.com deal was found by Cheapflights users on 1/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/223:24 pmONT - LAS
Nonstop1h 12mFrontier
Wed 2/255:12 pmLAS - ONT
Nonstop1h 10mFrontier
Deal found 1/7$69
This CheapOair deal was found by Cheapflights users on 1/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/261:05 pmONT - LAS
Nonstop1h 12mFrontier
Tue 1/2712:26 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 1/7$70

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to California 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 January 8, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.

Fly from

Ontario

Fly to

California

Route

Depart

Return

Price

OntarioFresno

ONT - FAT

ONTFAT

Ontario

Wed 2/4

3:07 pm-2:37 pm

1 stop23h 30m

Fresno Airterminal

Wed 2/11

1:08 pm-6:22 pm

1 stop5h 14m

$167

OntarioRedding

ONT - RDD

ONTRDD

Ontario

Sat 2/7

4:03 pm-2:35 pm

1 stop22h 32m

Redding

Tue 2/10

3:15 pm-8:36 pm

1 stop5h 21m

$174

OntarioRedding

ONT - RDD

ONTRDD

Ontario

Sat 1/31

11:53 am-2:35 pm

1 stop26h 42m

Redding

Wed 2/4

3:15 pm-8:36 pm

1 stop5h 21m

$174

OntarioReno

ONT - RNO

ONTRNO

Ontario

Wed 1/28

5:10 pm-11:36 pm

1 stop6h 26m

Reno

Tue 2/3

5:30 am-12:16 pm

1 stop6h 46m

$177

OntarioReno

ONT - RNO

ONTRNO

Ontario

Tue 1/27

5:10 pm-11:36 pm

1 stop6h 26m

Reno

Tue 2/3

5:20 pm-11:58 pm

1 stop6h 38m

$177

OntarioReno

ONT - RNO

ONTRNO

Ontario

Tue 1/27

5:10 pm-11:36 pm

1 stop6h 26m

Reno

Wed 2/4

5:30 am-12:16 pm

1 stop6h 46m

$177

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 2/5

8:10 am-9:15 am

Nonstop1h 05m

Las Vegas Harry Reid Intl

Sun 2/8

11:10 am-12:15 pm

Nonstop1h 05m

$179

OntarioReno

ONT - RNO

ONTRNO

Ontario

Fri 2/13

9:43 pm-10:40 am

1 stop12h 57m

Reno

Mon 2/16

11:35 am-5:48 pm

1 stop6h 13m

$179

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 1/28

1:00 pm-2:05 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 2/4

12:45 pm-1:50 pm

Nonstop1h 05m

$181

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 1/29

9:00 pm-10:05 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 2/2

7:45 pm-8:45 pm

Nonstop1h 00m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario to California

Have a flexible travel schedule? Discover the best time to fly to California from Ontario 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 Ontario to California

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

Currently, January is the cheapest month in which you can book a flight from Ontario to California (average of $18). Flying from Ontario to California in October is currently the most expensive (average of $58). 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 ONT to CA?

Find hourly flight availability from Ontario to California. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 8, 2026.

Unlike in the morning, when flights are generally more expensive, you can save up to 23% on flights from Ontario to California by exploring options for tickets in the evening.

What is the cheapest day to fly from Ontario to California?

Use this chart to determine the cheapest time to fly round-trip from Ontario to California. Price data was last updated on January 3, 2026.

Travelers seeking maximum savings on their Ontario to California flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing California

Get insights into the airlines that provide service to California. 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 California. Reviews last updated January 8, 2026.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and United Airlines from Ontario to California by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,672 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,672 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,250 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
9,142 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
11,097 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.7
Fair
3,061 reviews
Alaska Airlines
8.0
Very good
11,672 reviews

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Ontario to California. 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 from for flights from Ontario to California?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to California.

  • How long is the flight from Ontario to California?

    Alaska Airlines, Delta, and Southwest can get you from Ontario to California in just under 1h 05m. Your travel time can differ by up to 21h 27m. The distance between Ontario and California is about 197 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $19. However, be on the lookout for offers from Alaska Airlines and United Airlines, as they are both options that can get you from Ontario to California for a low price.

  • What are the most popular routes from Ontario to California?

    Most travelers choose Ontario - San Francisco, Ontario - Las Vegas Harry Reid Intl or Ontario - San Jose when deciding on the best route from Ontario to California.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to California 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 Ontario to California?

    Currently, January is the cheapest month in which you can book a flight from Ontario to California (average of $18). Flying from Ontario to California in October is currently the most expensive (average of $58). 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 Ontario to California

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
San Francisco to Ontario flights
Los Angeles to Seattle flights
San Francisco to Las Vegas flights
Los Angeles to Newark flights
Los Angeles to Honolulu flights
San Jose to Los Angeles flights
San Francisco to Santa Ana flights
Los Angeles to Las Vegas flights
Los Angeles to LaGuardia flights
Los Angeles to Miami flights
San Francisco to John F Kennedy Intl flights
San Francisco to Los Angeles flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to Orlando flights
Burbank to Las Vegas flights
Ontario to San Francisco flights
Santa Ana to Las Vegas flights
Los Angeles to San Francisco flights
Santa Ana to San Francisco flights
San Francisco to Dallas/Fort Worth flights
Los Angeles to Fort Lauderdale flights
Los Angeles to Salt Lake City flights
Los Angeles to O'Hare Intl flights
San Francisco to Newark flights
San Francisco to Honolulu flights
San Francisco to Sky Harbor Intl flights
Los Angeles to Reagan-National flights
San Francisco to LaGuardia flights
Los Angeles to San Jose flights
Ontario to Seattle flights
San Francisco to O'Hare Intl flights
Los Angeles to Dulles Intl flights
Los Angeles to Denver flights
Los Angeles to Boston flights
Sacramento to Las Vegas flights
San Francisco to San Diego flights
San Jose to Las Vegas flights
San Francisco to Seattle flights
Los Angeles to Baltimore flights
Los Angeles to Atlanta flights
Ontario to Las Vegas flights
Santa Ana to Dallas/Fort Worth flights
Los Angeles to New Orleans flights
San Francisco to Burbank flights
Los Angeles to Hobby flights
Ontario to Sky Harbor Intl flights
Los Angeles to Nashville flights
San Francisco to Miami flights
Los Angeles to Kahului flights

Top 5 airlines flying from Ontario to California

Discover the top 5 airlines that operate flights from Ontario to California. 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 January 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$127FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$48Average$74FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$59Average$186FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$175FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$271FlexibilityNo cancel feeOn-time63%

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.