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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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Apr 29 — May 61
Tue 4/29
Tue 5/6
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 April 24, 2025.

Round-trip from

$56
(Cheapflightsfares)

One-way from

$38
(Cheapflightsfares)

Good round-trip deal

$91 or less

Good one-way deal

$58 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 April 24, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/319:41 pmONT - SFO
Nonstop1h 30mFrontier
Mon 6/210:11 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 4/23$56
This FlightHub deal was found by Cheapflights users on 4/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2810:53 amONT - LAS
Nonstop1h 09mFrontier
Fri 5/26:20 amLAS - ONT
Nonstop1h 04mFrontier
Deal found 4/21$65
This United Airlines deal was found by Cheapflights users on 4/22. 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 5/31:45 pmONT - SFO
Nonstop1h 28mUnited Airlines
Sat 5/37:05 pmSFO - ONT
Nonstop1h 29mUnited Airlines
Deal found 4/22$72
This Southwest deal was found by Cheapflights users on 4/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/287:50 pmONT - OAK
Nonstop1h 20mSouthwest
Mon 6/21:10 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 4/24$77
This Southwest deal was found by Cheapflights users on 4/22. 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 5/227:35 pmONT - SJC
1 stop3h 20mSouthwest
Tue 5/278:05 amSJC - ONT
1 stop4h 15mSouthwest
Deal found 4/22$97
This Southwest deal was found by Cheapflights users on 4/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/304:55 pmONT - LAS
1 stop4h 25mSouthwest
Mon 6/25:20 amLAS - ONT
1 stop3h 50mSouthwest
Deal found 4/23$145
This Southwest deal was found by Cheapflights users on 4/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/63:40 pmONT - SFO
2 stops7h 00mSouthwest
Wed 5/75:15 amSFO - ONT
1 stop7h 05mSouthwest
Deal found 4/23$159
This Frontier deal was found by Cheapflights users on 4/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1512:59 amONT - RNO
1 stop10h 37mFrontier
Mon 5/1912:26 pmRNO - ONT
1 stop11h 33mFrontier
Deal found 4/23$160
This CheapOair deal was found by Cheapflights users on 4/22. 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 5/171:15 pmONT - SJC
1 stop18h 26mFrontier
Sun 5/1812:20 pmSJC - ONT
1 stop22h 55mFrontier
Deal found 4/22$160
This American Airlines deal was found by Cheapflights users on 4/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/306:15 amONT - SFO
1 stop6h 01mAmerican Airlines
Wed 4/303:54 pmSFO - ONT
1 stop6h 04mAmerican Airlines
Deal found 4/23$193
This Southwest deal was found by Cheapflights users on 4/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3110:55 amONT - SMF
Nonstop1h 20mSouthwest
Tue 6/38:15 pmSMF - ONT
Nonstop1h 25mSouthwest
Deal found 4/23$196
This Delta deal was found by Cheapflights users on 4/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/244:57 pmONT - RNO
1 stop4h 05mDelta
Wed 5/286:00 amRNO - ONT
1 stop6h 15mDelta
Deal found 4/23$199

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 April 24, 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

Fri 5/30

9:41 pm-11:11 pm

Nonstop1h 30m

San Francisco

Mon 6/2

10:11 pm-11:39 pm

Nonstop1h 28m

$56

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 5/8

10:15 pm-11:25 pm

Nonstop1h 10m

Las Vegas Harry Reid Intl

Sat 5/10

6:20 am-7:24 am

Nonstop1h 04m

$66

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Thu 5/22

6:20 pm-7:40 pm

Nonstop1h 20m

Oakland

Thu 5/29

1:10 pm-2:30 pm

Nonstop1h 20m

$77

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 5/22

7:35 pm-10:55 pm

1 stop3h 20m

San Jose

Tue 5/27

8:05 am-12:20 pm

1 stop4h 15m

$97

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 5/10

3:10 pm-4:53 pm

Nonstop1h 43m

San Francisco

Sat 5/10

7:05 pm-8:34 pm

Nonstop1h 29m

$112

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 5/14

7:55 am-9:00 am

Nonstop1h 05m

Las Vegas Harry Reid Intl

Sat 5/17

10:10 am-5:25 pm

2 stops7h 15m

$129

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 5/6

3:40 pm-10:40 pm

2 stops7h 00m

San Francisco

Wed 5/7

5:15 am-12:20 pm

1 stop7h 05m

$159

OntarioReno

ONT - RNO

ONTRNO

Ontario

Thu 5/15

12:59 am-11:36 am

1 stop10h 37m

Reno

Mon 5/19

12:26 pm-11:59 pm

1 stop11h 33m

$160

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 5/17

1:15 pm-7:41 am

1 stop18h 26m

San Jose

Sun 5/18

12:20 pm-11:15 am

1 stop22h 55m

$160

OntarioSacramento

ONT - SMF

ONTSMF

Ontario

Sat 5/31

10:55 am-12:15 pm

Nonstop1h 20m

Sacramento Intl

Tue 6/3

8:15 pm-9:40 pm

Nonstop1h 25m

$196

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

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 June is currently the most expensive (average of $328). 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 April 24, 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.

Rainfall in California by month

Plan your trip to California by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in California ranges from 0.0 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. July is typically the driest time to visit California when rainfall is around 0.0 in.

Temperature in California by month

Plan your trip to California by taking into account the average temperature totals by month.

If weather is an important factor for your trip to California, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 57.2 F).

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 April 24, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Ontario to California by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,918 reviews

Crew

8.5

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,918 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Crew

8.5

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,286 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Crew

8.5

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,920 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Crew

8.5

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Hawaiian Airlines
7.9
Good
2,393 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Crew

8.5

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,685 reviews
Alaska Airlines
8.0
Very good
9,918 reviews

Crew

8.5

Comfort

7.9

Boarding

8.2

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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.

  • 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 $38. 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 - Sacramento Intl 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 June is currently the most expensive (average of $328). 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 7 airlines flying from Ontario to California

Discover the top 7 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 April 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$26Average$89FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$31Average$111FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$64Average$347FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$403FlexibilityNo cancel feeOn-time75%
Breeze AirwaysCheapest$78Average$136FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$85Average$235FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$112Average$275FlexibilityNo cancel feeOn-time63%

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