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$35+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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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 18, 2025.

This Frontier deal was found by Cheapflights users on 12/17. 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 12/296:00 pmONT - LAS
Nonstop1h 11mFrontier
Tue 1/62:00 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/17$78
This CheapOair deal was found by Cheapflights users on 12/17. 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 12/256:07 pmONT - LAS
Nonstop1h 11mFrontier
Mon 1/261:30 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 12/17$91
This Trip.com deal was found by Cheapflights users on 12/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:00 amONT - LAS
Nonstop1h 07mFrontier
Tue 12/308:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/17$96
This Trip.com deal was found by Cheapflights users on 12/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:00 pmONT - LAS
Nonstop1h 11mFrontier
Fri 1/24:01 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 12/17$97
This Frontier deal was found by Cheapflights users on 12/17. 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.
Sun 12/286:37 pmONT - LAS
Nonstop1h 11mFrontier
Sat 1/310:18 pmLAS - ONT
Nonstop1h 03mFrontier
Deal found 12/17$98
This Frontier deal was found by Cheapflights users on 12/17. 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 12/276:00 amONT - LAS
Nonstop1h 07mFrontier
Fri 1/24:01 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 12/17$99
This CheapOair deal was found by Cheapflights users on 12/17. 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
Fri 1/24:01 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 12/17$100
This Trip.com deal was found by Cheapflights users on 12/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/266:00 amONT - LAS
Nonstop1h 07mFrontier
Sun 12/284:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/15$106
This Super.com deal was found by Cheapflights users on 12/17. 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 12/256:00 amONT - LAS
Nonstop1h 07mFrontier
Mon 12/294:06 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/17$107
This Frontier deal was found by Cheapflights users on 12/17. 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 12/316:00 amONT - LAS
Nonstop1h 07mFrontier
Sun 1/48:23 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/17$109
This Frontier deal was found by Cheapflights users on 12/16. 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.
Sun 12/2810:12 pmONT - SFO
Nonstop1h 40mFrontier
Mon 1/510:44 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/16$138
This Frontier deal was found by Cheapflights users on 12/16. 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
Mon 1/510:44 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/16$139

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 18, 2025.

Round-trip from

$57
(Super.com)

One-way from

$35
(Frontier)

Good round-trip deal

$169 or less

Good one-way deal

$113 or less
From Ontario to California
Search Deals
One-way flight from Ontario to California
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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.
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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 18, 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

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 3/21

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Mon 3/30

3:45 pm-5:12 pm

Nonstop1h 27m

$157

OntarioReno

ONT - RNO

ONTRNO

Ontario

Sat 1/17

9:10 pm-11:22 am

1 stop14h 12m

Reno

Tue 1/20

8:41 pm-2:12 pm

1 stop17h 31m

$161

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 1/24

5:30 am-6:35 am

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 1/28

8:45 am-12:25 pm

1 stop3h 40m

$162

OntarioSacramento

ONT - SMF

ONTSMF

Ontario

Thu 1/8

6:00 am-1:34 pm

1 stop7h 34m

Sacramento Intl

Mon 1/12

12:02 pm-11:56 pm

1 stop11h 54m

$162

OntarioFresno

ONT - FAT

ONTFAT

Ontario

Wed 1/14

6:49 pm-2:37 pm

1 stop19h 48m

Fresno Airterminal

Wed 1/21

6:09 pm-10:09 am

1 stop16h 00m

$169

OntarioFresno

ONT - FAT

ONTFAT

Ontario

Mon 1/12

2:34 pm-8:28 pm

1 stop5h 54m

Fresno Airterminal

Mon 1/19

9:18 pm-1:37 pm

1 stop16h 19m

$175

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

5:55 am-10:05 am

1 stop4h 10m

Oakland

Tue 1/27

2:45 pm-4:05 pm

Nonstop1h 20m

$181

OntarioReno

ONT - RNO

ONTRNO

Ontario

Mon 3/2

3:28 pm-7:21 pm

1 stop3h 53m

Reno

Sat 3/7

3:44 pm-9:03 pm

1 stop5h 19m

$181

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 2/19

5:30 am-8:40 am

1 stop3h 10m

Las Vegas Harry Reid Intl

Sat 2/21

9:10 am-10:15 am

Nonstop1h 05m

$181

OntarioSacramento

ONT - SMF

ONTSMF

Ontario

Thu 1/15

4:34 pm-3:35 pm

1 stop23h 01m

Sacramento Intl

Mon 1/19

4:20 pm-1:37 pm

1 stop21h 17m

$182

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 60 results
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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 18, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 57% 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 18, 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
11,474 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

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
11,474 reviews
Alaska Airlines
8.0
Very good
11,474 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

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
7.9
Good
4,249 reviews
Alaska Airlines
8.0
Very good
11,474 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

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
9,092 reviews
Alaska Airlines
8.0
Very good
11,474 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

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
11,053 reviews
Alaska Airlines
8.0
Very good
11,474 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

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
5.8
Fair
3,082 reviews
Alaska Airlines
8.0
Very good
11,474 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

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, Southwest, and Frontier can get you from Ontario to California in just under 1h 05m. Your travel time can differ by up to 6h 29m. 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 Avelo 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, 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.

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Alternative routes for Ontario to California

See prices for flight routes from nearby airports that may be better suited for you.
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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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$34Average$125FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$48Average$74FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$184FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$187FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$271FlexibilityNo cancel feeOn-time63%

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