HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
California

$34+ 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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jan 25 — Feb 11
Sun 1/25
Sun 2/1
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

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 December 26, 2025.

This Frontier deal was found by Cheapflights users on 12/24. 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.
Wed 12/314:22 pmONT - LAS
1 stop7h 32mFrontier
Wed 1/78:45 amLAS - ONT
Nonstop1h 05mFrontier
Deal found 12/24$151
This CheapOair deal was found by Cheapflights users on 12/24. 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.
Tue 12/306:00 amONT - LAS
Nonstop1h 07mFrontier
Thu 1/152:30 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/24$170
This Frontier deal was found by Cheapflights users on 12/24. 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.
Wed 12/314:22 pmONT - LAS
1 stop7h 32mFrontier
Thu 1/14:13 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/24$181
This CheapOair deal was found by Cheapflights users on 12/24. 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 12/266:00 amONT - LAS
Nonstop1h 07mFrontier
Wed 1/281:01 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 12/24$190
This Cheapflightsfares deal was found by Cheapflights users on 12/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:54 pmONT - LAS
Nonstop1h 09mFrontier
Mon 2/21:30 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 12/26$191
This CheapOair deal was found by Cheapflights users on 12/23. 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.
Sat 12/276:00 amONT - LAS
Nonstop1h 07mFrontier
Sat 1/176:42 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 12/23$192
This CheapOair deal was found by Cheapflights users on 12/24. 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.
Wed 12/246:00 amONT - LAS
Nonstop1h 07mFrontier
Tue 1/62:00 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/24$196
This Super.com deal was found by Cheapflights users on 12/25. 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.
Wed 12/316:00 amONT - LAS
Nonstop1h 07mFrontier
Fri 1/28:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/25$197
This Cheapflightsfares deal was found by Cheapflights users on 12/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:12 pmONT - SFO
Nonstop1h 40mFrontier
Mon 1/510:44 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/26$274
This Cheapflightsfares deal was found by Cheapflights users on 12/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:12 pmONT - SFO
Nonstop1h 40mFrontier
Fri 1/210:44 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/26$284
This Frontier deal was found by Cheapflights users on 12/26. 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.
Mon 12/2910:12 pmONT - SFO
Nonstop1h 40mFrontier
Sun 1/410:31 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/26$285
This CheapOair deal was found by Cheapflights users on 12/26. 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 12/2610:12 pmONT - SFO
Nonstop1h 40mFrontier
Wed 1/147:00 amSFO - ONT
1 stop15h 59mFrontier
Deal found 12/26$302

Find flight deals from Ontario to California

Keep the following information in mind while searching for Ontario to California flight deals. Data was last updated December 26, 2025.

Round-trip from

$60
(Super.com)

One-way from

$34
(Super.com)

Good round-trip deal

$194 or less

Good one-way deal

$114 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

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 December 26, 2025.
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

OntarioReno

ONT - RNO

ONTRNO

Ontario

Mon 1/12

2:34 pm-7:29 pm

1 stop4h 55m

Reno

Thu 1/15

9:37 pm-7:37 am

1 stop10h 00m

$162

OntarioReno

ONT - RNO

ONTRNO

Ontario

Thu 1/22

11:04 am-11:29 am

1 stop24h 25m

Reno

Mon 1/26

10:00 pm-1:37 pm

1 stop15h 37m

$163

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 1/22

6:22 am-12:25 pm

1 stop6h 03m

Santa Rosa Sonoma County

Thu 2/12

4:27 pm-10:04 pm

1 stop5h 37m

$176

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 1/29

6:22 am-12:25 pm

1 stop6h 03m

Santa Rosa Sonoma County

Sun 2/1

4:23 pm-10:13 pm

1 stop5h 50m

$176

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 1/24

9:59 am-3:53 pm

1 stop5h 54m

Santa Rosa Sonoma County

Tue 1/27

12:55 pm-6:20 pm

1 stop5h 25m

$176

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 1/21

5:50 pm-7:15 pm

Nonstop1h 25m

Oakland

Wed 1/28

7:00 am-8:20 am

Nonstop1h 20m

$177

OntarioReno

ONT - RNO

ONTRNO

Ontario

Fri 1/23

8:48 pm-10:40 am

1 stop13h 52m

Reno

Fri 1/30

8:41 pm-6:40 pm

1 stop21h 59m

$178

OntarioReno

ONT - RNO

ONTRNO

Ontario

Sat 2/7

3:04 pm-7:46 pm

1 stop4h 42m

Reno

Tue 2/10

8:41 pm-9:34 pm

2 stops24h 53m

$180

OntarioSacramento

ONT - SMF

ONTSMF

Ontario

Wed 1/21

11:10 am-12:40 pm

Nonstop1h 30m

Sacramento Intl

Sat 1/24

11:45 am-1:05 pm

Nonstop1h 20m

$181

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 2/11

7:30 am-1:34 pm

1 stop6h 04m

San Jose

Sat 2/21

7:15 am-1:54 pm

1 stop6h 39m

$185

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/26

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, February 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 December 26, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 56% 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 December 16, 2024.

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 afternoons 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 December 26, 2025.
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
11,542 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

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
11,542 reviews
Alaska Airlines
8.0
Very good
11,542 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

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
4,258 reviews
Alaska Airlines
8.0
Very good
11,542 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

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
9,116 reviews
Alaska Airlines
8.0
Very good
11,542 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

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
11,067 reviews
Alaska Airlines
8.0
Very good
11,542 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

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
5.8
Fair
3,071 reviews
Alaska Airlines
8.0
Very good
11,542 reviews

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

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?

    Frontier, Southwest, and American Airlines can get you from Ontario to California in just under 1h 30m. Your travel time can differ by up to 4h 33m. The distance between Ontario and California is about 390 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 Avelo Airlines and Alaska 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, February 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 Las Vegas flights
Los Angeles to Honolulu flights
Los Angeles to Newark flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Seattle flights
Los Angeles to Miami flights
Los Angeles to Las Vegas flights
Los Angeles to LaGuardia flights
San Francisco to Newark flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to Orlando flights
Los Angeles to Fort Lauderdale flights
Santa Ana to Las Vegas flights
San Francisco to Honolulu flights
Burbank to Las Vegas flights
Los Angeles to O'Hare Intl flights
San Francisco to Ontario flights
San Francisco to Los Angeles flights
Los Angeles to San Francisco flights
Los Angeles to Denver flights
San Francisco to LaGuardia flights
San Jose to Las Vegas flights
San Francisco to Dallas/Fort Worth flights
San Francisco to Seattle flights
San Francisco to Miami flights
San Francisco to Orlando flights
Los Angeles to Kahului flights
Ontario to San Francisco flights
San Francisco to Kahului flights
Los Angeles to Hobby flights
Ontario to Las Vegas flights
San Francisco to O'Hare Intl flights
San Francisco to Santa Ana flights
Santa Ana to San Francisco flights
Los Angeles to Reagan-National flights
San Francisco to Sky Harbor Intl flights
Ontario to John F Kennedy Intl flights
Sacramento to Las Vegas flights
San Diego to John F Kennedy Intl flights
Oakland to Las Vegas flights
Santa Ana to Dallas/Fort Worth flights
Ontario to Dallas/Fort Worth flights
Los Angeles to Salt Lake City flights
Los Angeles to Boston flights
Los Angeles to Sky Harbor Intl flights
Los Angeles to New Orleans flights
Los Angeles to Portland flights
San Francisco to New Orleans flights
San Francisco to Denver 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 December 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$35Average$128FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$48Average$74FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$185FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$187FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$270FlexibilityNo 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.
Site
©2025 Cheapflights