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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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
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 July 1, 2025.

Round-trip from

$57
(United Airlines)

One-way from

$29
(United Airlines)

Good round-trip deal

$109 or less

Good one-way deal

$69 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 July 1, 2025.

This United Airlines deal was found by Cheapflights users on 6/30. 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.
Tue 7/291:19 pmONT - SFO
Nonstop1h 27mUnited Airlines
Tue 8/54:16 pmSFO - ONT
Nonstop1h 27mUnited Airlines
Deal found 6/30$57
This Frontier deal was found by Cheapflights users on 6/28. 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 8/49:47 pmONT - SFO
Nonstop1h 33mFrontier
Mon 8/1110:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 6/28$58
This Frontier deal was found by Cheapflights users on 6/30. 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 7/125:13 pmONT - LAS
Nonstop1h 14mFrontier
Mon 7/147:45 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 6/30$78
This Southwest deal was found by Cheapflights users on 6/29. 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 9/92:55 pmONT - OAK
Nonstop1h 20mSouthwest
Thu 9/111:10 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 6/29$97
This Southwest deal was found by Cheapflights users on 7/1. 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 8/1410:00 amONT - SJC
Nonstop1h 15mSouthwest
Mon 8/186:30 amSJC - ONT
Nonstop1h 25mSouthwest
Deal found 7/1$97
This Southwest deal was found by Cheapflights users on 6/30. 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.
Mon 8/45:40 amONT - LAS
Nonstop1h 05mSouthwest
Wed 8/68:40 amLAS - ONT
1 stop3h 20mSouthwest
Deal found 6/30$107
This CheapOair deal was found by Cheapflights users on 6/29. 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 7/265:13 pmONT - SJC
1 stop24h 51mFrontier
Mon 7/282:12 pmSJC - ONT
1 stop26h 08mFrontier
Deal found 6/29$122
This Priceline deal was found by Cheapflights users on 7/1. 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 7/2712:59 amONT - RNO
1 stop10h 04mFrontier
Thu 7/3112:43 pmRNO - ONT
1 stop3h 36mFrontier
Deal found 7/1$154
This Mytrip deal was found by Cheapflights users on 6/30. 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.
Sun 9/1410:23 pmONT - SAN
1 stop13h 15mFrontier
Wed 9/178:00 amSAN - ONT
1 stop13h 56mFrontier
Deal found 6/30$163
This Delta deal was found by Cheapflights users on 7/1. 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.
Mon 8/114:50 pmONT - RNO
1 stop6h 38mDelta
Tue 8/125:10 pmRNO - ONT
1 stop6h 30mDelta
Deal found 7/1$197
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Tue 7/296:39 pmONT - RNO
1 stop5h 20mUnited Airlines
Tue 8/56:15 amRNO - ONT
1 stop5h 59mUnited Airlines
Deal found 7/1$198
This Southwest deal was found by Cheapflights users on 6/29. 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 8/15:25 amONT - SMF
Nonstop1h 20mSouthwest
Mon 8/410:15 amSMF - ONT
Nonstop1h 20mSouthwest
Deal found 6/29$198

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 July 1, 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

Tue 7/29

1:19 pm-2:46 pm

Nonstop1h 27m

San Francisco

Tue 8/5

4:16 pm-5:43 pm

Nonstop1h 27m

$57

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 8/4

9:47 pm-11:20 pm

Nonstop1h 33m

San Francisco

Sun 8/10

10:11 pm-11:40 pm

Nonstop1h 29m

$58

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 7/12

5:13 pm-6:27 pm

Nonstop1h 14m

Las Vegas Harry Reid Intl

Mon 7/14

7:45 pm-8:52 pm

Nonstop1h 07m

$78

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 9/9

2:55 pm-4:15 pm

Nonstop1h 20m

Oakland

Thu 9/11

1:10 pm-2:30 pm

Nonstop1h 20m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 8/14

10:00 am-11:15 am

Nonstop1h 15m

San Jose

Mon 8/18

6:30 am-7:55 am

Nonstop1h 25m

$97

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 8/12

9:00 pm-10:10 pm

Nonstop1h 10m

Las Vegas Harry Reid Intl

Fri 8/15

6:50 pm-7:55 pm

Nonstop1h 05m

$100

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Fri 8/22

6:00 am-5:32 pm

1 stop11h 32m

San Jose

Sun 8/31

6:27 pm-8:52 pm

1 stop26h 25m

$125

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 8/18

6:00 am-12:08 pm

1 stop6h 08m

San Diego

Tue 8/19

8:00 am-4:18 pm

1 stop8h 18m

$126

OntarioReno

ONT - RNO

ONTRNO

Ontario

Sun 7/27

12:59 am-11:03 am

1 stop10h 04m

Reno

Thu 7/31

12:43 pm-4:19 pm

1 stop3h 36m

$154

OntarioSacramento

ONT - SMF

ONTSMF

Ontario

Fri 8/15

8:05 am-9:25 am

Nonstop1h 20m

Sacramento Intl

Sun 8/17

9:05 am-10:30 am

Nonstop1h 25m

$195

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 55 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 $326). 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 July 1, 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 July 1, 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. 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
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,273 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,973 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,539 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,858 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 United Airlines, with whom users have recently found tickets for as low as $29. However, be on the lookout for offers from Frontier 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?

    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 $326). 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 July 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$23Average$74FlexibilityNo cancel feeOn-time65%
FrontierCheapest$34Average$97FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$249FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$288FlexibilityNo cancel feeOn-time75%
DeltaCheapest$85Average$197FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$114Average$284FlexibilityNo cancel feeOn-time63%

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