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$29+ 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 12/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Nov 21 — Nov 281
Fri 11/21
Fri 11/28
1 adult, Economy
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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 October 22, 2025.

Round-trip from

$57
(CheapOair)

One-way from

$29
(CheapOair)

Good round-trip deal

$124 or less

Good one-way deal

$80 or less
From Ontario to California
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One-way flight from Ontario to California
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Price to beat on a round-trip flight from Ontario to California.
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Price to beat on a one-way flight from Ontario to California.
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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 October 22, 2025.

This CheapOair deal was found by Cheapflights users on 10/21. 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 12/46:15 amONT - LAS
Nonstop1h 07mFrontier
Fri 12/512:02 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 10/21$57
This Priceline deal was found by Cheapflights users on 10/20. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:15 amONT - LAS
Nonstop1h 07mFrontier
Tue 12/234:13 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 10/20$64
This Priceline deal was found by Cheapflights users on 10/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/75:18 pmONT - LAS
Nonstop1h 09mFrontier
Thu 12/118:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 10/21$65
This CheapOair deal was found by Cheapflights users on 10/20. 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 11/118:00 amONT - LAS
Nonstop1h 12mFrontier
Sat 11/1511:27 amLAS - ONT
Nonstop1h 10mFrontier
Deal found 10/20$67
This CheapOair deal was found by Cheapflights users on 10/21. 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 12/16:30 amONT - LAS
Nonstop1h 10mFrontier
Fri 12/512:02 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 10/21$69
This Frontier deal was found by Cheapflights users on 10/20. 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 11/310:43 pmONT - LAS
Nonstop1h 10mFrontier
Mon 11/108:51 pmLAS - ONT
Nonstop1h 06mFrontier
Deal found 10/20$72
This CheapOair deal was found by Cheapflights users on 10/20. 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 12/510:12 pmONT - SFO
Nonstop1h 40mFrontier
Sun 12/710:03 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 10/20$72
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 12/306:15 amONT - LAS
Nonstop1h 07mFrontier
Wed 12/318:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 10/21$73
This CheapOair deal was found by Cheapflights users on 10/20. 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 10/2710:50 pmONT - SFO
Nonstop1h 29mFrontier
Mon 11/310:21 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/20$73
This Priceline deal was found by Cheapflights users on 10/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3010:40 pmONT - SFO
Nonstop1h 29mFrontier
Fri 10/3110:21 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 10/21$74
This Frontier deal was found by Cheapflights users on 10/21. 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 12/316:15 amONT - LAS
Nonstop1h 07mFrontier
Wed 12/318:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 10/21$75
This CheapOair deal was found by Cheapflights users on 10/21. 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 12/186:15 amONT - LAS
Nonstop1h 07mFrontier
Thu 12/254:13 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 10/21$76

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 October 22, 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

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 12/3

6:15 am-7:48 am

1 stop25h 33m

San Francisco

Fri 12/5

10:20 pm-11:48 pm

Nonstop1h 28m

$102

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 12/18

5:24 pm-6:33 pm

Nonstop1h 09m

Las Vegas Harry Reid Intl

Sat 12/20

3:25 pm-4:31 pm

Nonstop1h 06m

$110

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 12/12

5:18 pm-6:27 pm

Nonstop1h 09m

Las Vegas Harry Reid Intl

Sun 12/14

8:13 pm-9:17 pm

Nonstop1h 04m

$113

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 11/14

7:44 pm-8:55 pm

Nonstop1h 11m

Las Vegas Harry Reid Intl

Sun 11/16

6:10 am-7:17 am

Nonstop1h 07m

$122

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 11/16

7:44 pm-8:55 pm

Nonstop1h 11m

Las Vegas Harry Reid Intl

Tue 11/18

12:34 pm-9:27 pm

1 stop8h 53m

$123

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 11/12

8:00 am-9:12 am

Nonstop1h 12m

Las Vegas Harry Reid Intl

Mon 11/17

7:00 am-11:50 pm

1 stop16h 50m

$129

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 11/1

6:53 am-10:27 pm

1 stop15h 34m

San Francisco

Mon 11/3

10:21 pm-11:50 pm

Nonstop1h 29m

$130

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 10/31

7:44 pm-5:49 pm

1 stop22h 05m

San Francisco

Mon 11/3

10:21 pm-11:50 pm

Nonstop1h 29m

$130

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 11/19

6:00 am-7:24 am

Nonstop1h 24m

San Francisco

Wed 11/19

11:15 am-12:37 pm

Nonstop1h 22m

$132

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 11/15

6:00 am-7:24 am

Nonstop1h 24m

San Francisco

Mon 11/17

9:30 pm-10:51 pm

Nonstop1h 21m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

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, December is the cheapest month in which you can book a flight from Ontario to California (average of $17). Flying from Ontario to California in August is currently the most expensive (average of $57). 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 October 22, 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 Thursday evenings when fares are most often at their lowest. Tuesday 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 October 22, 2025.
Get a feel of what it's like to fly with Southwest, United Airlines, and American 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.
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,988 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,029 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Spirit Airlines
6.3
Okay
8,097 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,129 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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, United Airlines, and Delta can get you from Ontario to California in just under 1h 24m. Your travel time can differ by up to 24h 09m. The distance between Ontario and California is about 363 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 $46. However, be on the lookout for offers from Southwest 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, December is the cheapest month in which you can book a flight from Ontario to California (average of $17). Flying from Ontario to California in August is currently the most expensive (average of $57). 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 Ontario to California

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ontario to California

Discover the top 6 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 October 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$36Average$111FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$37Average$80FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$185FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$200FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$286FlexibilityNo cancel feeOn-time63%
DeltaCheapest$147Average$197FlexibilityNo cancel feeOn-timeN/A

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