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$36+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$71
(Southwest)

One-way from

$36
(Cheapflightsfares)

Good round-trip deal

$132 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 September 11, 2025.

This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:35 pmONT - LAS
Nonstop1h 05mSouthwest
Thu 10/1610:00 pmLAS - ONT
Nonstop1h 00mSouthwest
Deal found 9/11$71
This Frontier deal was found by Cheapflights users on 9/10. 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.
Tue 11/118:00 amONT - LAS
Nonstop1h 12mFrontier
Tue 11/117:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 9/10$72
This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/59:05 pmONT - LAS
Nonstop1h 05mSouthwest
Wed 10/87:20 amLAS - ONT
Nonstop1h 05mSouthwest
Deal found 9/11$73
This Frontier deal was found by Cheapflights users on 9/11. 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 9/256:00 amONT - LAS
Nonstop1h 11mFrontier
Wed 10/157:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 9/11$76
This SmartFares deal was found by Cheapflights users on 9/11. 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.
Fri 10/310:40 pmONT - SFO
Nonstop1h 35mFrontier
Mon 10/610:11 pmSFO - ONT
Nonstop1h 27mFrontier
Deal found 9/11$76
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Wed 9/248:00 amONT - LAS
Nonstop1h 11mFrontier
Wed 9/248:49 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/11$77
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 11/16:00 amONT - SFO
Nonstop1h 24mUnited Airlines
Mon 11/39:30 pmSFO - ONT
Nonstop1h 21mUnited Airlines
Deal found 9/9$77
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 9/2910:28 pmONT - LAS
Nonstop1h 16mFrontier
Tue 9/308:49 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/11$78
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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.
Wed 10/158:00 amONT - LAS
Nonstop1h 12mFrontier
Fri 10/176:40 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/9$79
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
Wed 10/158:00 amONT - LAS
Nonstop1h 12mFrontier
Mon 10/206:40 amLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/10$80
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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.
Sat 10/48:00 amONT - LAS
Nonstop1h 11mFrontier
Sat 10/411:27 amLAS - ONT
Nonstop1h 16mFrontier
Deal found 9/9$81
This Southwest deal was found by Cheapflights users on 9/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/149:10 pmONT - LAS
Nonstop1h 05mSouthwest
Fri 10/177:40 amLAS - ONT
Nonstop1h 05mSouthwest
Deal found 9/9$82

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 September 11, 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

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 10/27

9:35 pm-10:40 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 10/29

7:20 am-8:25 am

Nonstop1h 05m

$71

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 10/1

9:00 pm-10:10 pm

Nonstop1h 10m

Las Vegas Harry Reid Intl

Thu 10/2

10:00 pm-11:00 pm

Nonstop1h 00m

$71

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 10/5

9:05 pm-10:10 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 10/8

7:20 am-8:25 am

Nonstop1h 05m

$73

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 10/11

8:45 pm-9:50 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 10/13

10:00 pm-11:00 pm

Nonstop1h 00m

$73

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 10/12

9:05 pm-10:10 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 10/13

10:00 pm-11:00 pm

Nonstop1h 00m

$75

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 10/1

9:00 pm-10:10 pm

Nonstop1h 10m

Las Vegas Harry Reid Intl

Tue 10/7

7:20 am-8:25 am

Nonstop1h 05m

$82

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 9/26

10:28 pm-11:44 pm

Nonstop1h 16m

Las Vegas Harry Reid Intl

Thu 10/16

10:37 am-11:47 am

Nonstop1h 10m

$84

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 10/2

9:46 pm-11:15 pm

Nonstop1h 29m

San Francisco

Fri 10/10

10:43 pm-12:12 am

Nonstop1h 29m

$86

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 10/27

5:15 pm-6:27 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Mon 10/27

8:59 pm-10:05 pm

Nonstop1h 06m

$87

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 10/10

5:15 pm-9:29 am

1 stop16h 14m

San Francisco

Mon 10/13

10:43 pm-12:12 am

Nonstop1h 29m

$104

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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, January is the cheapest month in which you can book a flight from Ontario to California (average of $246). Flying from Ontario to California in March is currently the most expensive (average of $325). 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 September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to California as you normally would.

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 September 11, 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
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

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
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

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
8,023 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

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
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Comfort

8.0

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?

    Southwest, Frontier, and United Airlines can get you from Ontario to California in just under 1h 05m. Your travel time will be generally consistent. The distance between Ontario and California is about 197 mi. Most flights are nonstop.

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

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $36. However, be on the lookout for offers from United Airlines and Frontier, 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 $246). Flying from Ontario to California in March is currently the most expensive (average of $325). 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$31Average$86FlexibilityNo cancel feeOn-time65%
FrontierCheapest$36Average$103FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$283FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$200FlexibilityNo cancel feeOn-time75%
DeltaCheapest$97Average$207FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$103Average$272FlexibilityNo cancel feeOn-time63%

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