California

$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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Mar 12 — Mar 191
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Find cheap flights from Ontario to California with Cheapflights

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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 February 10, 2026.

This Mytrip deal was found by Cheapflights users on 2/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:24 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
Mon 3/97:00 am
LAS
-
ONT
Nonstop1h 06m
Frontier
Deal found 2/10$59
This Frontier deal was found by Cheapflights users on 2/7. 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 4/210:27 pm
ONT
-
LAS
Nonstop1h 11m
Frontier
Tue 4/71:14 pm
LAS
-
ONT
Nonstop1h 12m
Frontier
Deal found 2/7$60
This Frontier deal was found by Cheapflights users on 2/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/168:59 pm
ONT
-
LAS
Nonstop1h 09m
Frontier
Mon 4/206:59 pm
LAS
-
ONT
Nonstop1h 05m
Frontier
Deal found 2/9$61
This CheapOair deal was found by Cheapflights users on 2/7. 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 2/279:43 pm
ONT
-
LAS
Nonstop1h 10m
Frontier
Wed 3/45:12 pm
LAS
-
ONT
Nonstop1h 10m
Frontier
Deal found 2/7$62
This Super.com deal was found by Cheapflights users on 2/7. 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.
Wed 3/2510:03 pm
ONT
-
LAS
Nonstop1h 11m
Frontier
Wed 4/17:55 pm
LAS
-
ONT
Nonstop1h 05m
Frontier
Deal found 2/7$64
This Frontier deal was found by Cheapflights users on 2/7. 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.
Sun 3/13:24 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
Sun 3/18:21 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 2/7$68
This Super.com deal was found by Cheapflights users on 2/6. 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.
Sat 4/257:18 pm
ONT
-
LAS
Nonstop1h 10m
Frontier
Mon 4/276:59 pm
LAS
-
ONT
Nonstop1h 05m
Frontier
Deal found 2/6$69
This CheapOair deal was found by Cheapflights users on 2/7. 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 4/1311:10 am
ONT
-
LAS
Nonstop1h 15m
Frontier
Mon 4/137:02 pm
LAS
-
ONT
Nonstop1h 05m
Frontier
Deal found 2/7$70
This Super.com deal was found by Cheapflights users on 2/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:44 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
Thu 5/147:00 am
LAS
-
ONT
Nonstop1h 04m
Frontier
Deal found 2/10$72
This Frontier deal was found by Cheapflights users on 2/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/208:59 pm
ONT
-
LAS
Nonstop1h 09m
Frontier
Tue 4/215:26 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 2/8$73
This Frontier deal was found by Cheapflights users on 2/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1911:44 am
ONT
-
LAS
Nonstop1h 15m
Frontier
Wed 4/225:26 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 2/9$74
This Frontier deal was found by Cheapflights users on 2/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:44 am
ONT
-
LAS
Nonstop1h 15m
Frontier
Thu 4/306:59 pm
LAS
-
ONT
Nonstop1h 05m
Frontier
Deal found 2/9$75

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 February 10, 2026.

Round-trip from

$59
(Mytrip)

One-way from

$29
(Frontier)

Good round-trip deal

$157 or less

Good one-way deal

$137 or less
From Ontario to California
One-way flight from Ontario to California
Price to beat on a round-trip flight from Ontario to California.
Price to beat on a one-way flight from Ontario to California.

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 February 10, 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

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 3/11

7:05 am-11:10 am

1 stop4h 05m

San Jose

Wed 3/18

12:30 pm-1:45 pm

Nonstop1h 15m

$107

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 4/8

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sat 4/11

2:12 pm-3:42 pm

Nonstop1h 30m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 3/21

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Tue 3/24

2:12 pm-3:42 pm

Nonstop1h 30m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 4/2

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Wed 4/8

2:12 pm-3:42 pm

Nonstop1h 30m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 3/19

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 3/22

2:18 pm-3:48 pm

Nonstop1h 30m

$127

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 4/17

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Mon 4/20

2:12 pm-3:42 pm

Nonstop1h 30m

$137

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 3/19

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 3/29

2:18 pm-3:48 pm

Nonstop1h 30m

$137

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 4/2

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 4/5

2:18 pm-3:48 pm

Nonstop1h 30m

$137

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 4/4

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 4/5

2:18 pm-3:48 pm

Nonstop1h 30m

$137

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 3/11

7:00 pm-8:15 pm

Nonstop1h 15m

San Jose

Thu 3/12

6:20 am-10:25 am

1 stop4h 05m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

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, March is the cheapest month in which you can book a flight from Ontario to California (average of $31). 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 February 10, 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 February 7, 2026.

Travelers seeking maximum savings on their Ontario to California flight should consider departing on Saturday evenings 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 February 10, 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.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

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, Alaska Airlines, and United Airlines can get you from Ontario to California in just under 1h 33m. Your travel time can differ by up to 2h 32m. 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 $29. However, be on the lookout for offers from United Airlines and Southwest, 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?

  • 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, March is the cheapest month in which you can book a flight from Ontario to California (average of $31). 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

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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.

Top 4 airlines flying from Ontario to California

Discover the top 4 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 February 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$32Average$125FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$186FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$173FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$275FlexibilityNo cancel feeOn-time63%

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