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$39+ 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 8/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$52
(United Airlines)

One-way from

$39
(Southwest)

Good round-trip deal

$93 or less

Good one-way deal

$47 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 June 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/16:10 amONT - SFO
Nonstop1h 27mUnited Airlines
Mon 8/49:25 pmSFO - ONT
Nonstop1h 27mUnited Airlines
Deal found 6/10$57
This Frontier deal was found by Cheapflights users on 6/11. 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.
Wed 8/137:00 amONT - LAS
Nonstop1h 11mFrontier
Wed 8/203:07 pmLAS - ONT
Nonstop1h 11mFrontier
Deal found 6/11$77
This Frontier deal was found by Cheapflights users on 6/12. 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.
Fri 8/89:41 pmONT - SFO
Nonstop1h 33mFrontier
Fri 8/1510:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 6/12$89
This Southwest deal was found by Cheapflights users on 6/12. 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 9/98:15 amONT - OAK
Nonstop1h 20mSouthwest
Tue 9/94:15 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 6/12$97
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/115:05 pmONT - LAS
Nonstop1h 10mSouthwest
Mon 8/119:00 pmLAS - ONT
Nonstop1h 00mSouthwest
Deal found 6/10$97
This Southwest deal was found by Cheapflights users on 6/11. 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.
Wed 9/101:55 pmONT - SJC
Nonstop1h 15mSouthwest
Fri 9/126:30 amSJC - ONT
Nonstop1h 25mSouthwest
Deal found 6/11$146
This FlightHub deal was found by Cheapflights users on 6/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/186:00 amONT - SAN
1 stop12h 10mFrontier
Tue 8/268:00 amSAN - ONT
1 stop8h 18mFrontier
Deal found 6/11$163
This Frontier deal was found by Cheapflights users on 6/12. 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 8/76:00 amONT - SJC
1 stop12h 04mFrontier
Mon 8/112:12 pmSJC - ONT
1 stop6h 40mFrontier
Deal found 6/12$165
This CheapOair deal was found by Cheapflights users on 6/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/189:15 amONT - RNO
1 stop9h 19mFrontier
Sun 9/217:19 pmRNO - ONT
1 stop12h 18mFrontier
Deal found 6/9$176
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/204:50 pmONT - SFO
1 stop5h 41mAmerican Airlines
Tue 6/249:15 amSFO - ONT
1 stop6h 58mAmerican Airlines
Deal found 6/11$187
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/136:05 amONT - RNO
1 stop6h 17mDelta
Wed 8/205:10 pmRNO - ONT
1 stop6h 30mDelta
Deal found 6/11$197
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/106:00 amONT - SMF
1 stop5h 25mDelta
Fri 7/115:30 amSMF - ONT
1 stop6h 44mDelta
Deal found 6/10$197

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 June 12, 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 7/15

6:39 pm-8:06 pm

Nonstop1h 27m

San Francisco

Tue 7/15

9:25 pm-10:52 pm

Nonstop1h 27m

$52

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 8/13

7:00 am-8:11 am

Nonstop1h 11m

Las Vegas Harry Reid Intl

Tue 8/19

3:07 pm-4:18 pm

Nonstop1h 11m

$77

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 8/8

9:41 pm-11:14 pm

Nonstop1h 33m

San Francisco

Fri 8/15

10:11 pm-11:40 pm

Nonstop1h 29m

$89

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 9/9

8:15 am-9:35 am

Nonstop1h 20m

Oakland

Tue 9/9

4:15 pm-5:35 pm

Nonstop1h 20m

$97

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 8/11

5:05 pm-6:15 pm

Nonstop1h 10m

Las Vegas Harry Reid Intl

Mon 8/11

9:00 pm-10:00 pm

Nonstop1h 00m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 9/10

1:55 pm-3:10 pm

Nonstop1h 15m

San Jose

Fri 9/12

6:30 am-7:55 am

Nonstop1h 25m

$146

OntarioSan Diego

ONT - SAN

ONTSAN

Ontario

Mon 8/18

6:00 am-6:10 pm

1 stop12h 10m

San Diego

Tue 8/26

8:00 am-4:18 pm

1 stop8h 18m

$163

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 8/7

6:00 am-6:04 pm

1 stop12h 04m

San Jose

Mon 8/11

2:12 pm-8:52 pm

1 stop6h 40m

$165

OntarioReno

ONT - RNO

ONTRNO

Ontario

Thu 9/18

9:15 am-6:34 pm

1 stop9h 19m

Reno

Sun 9/21

7:19 pm-7:37 am

1 stop12h 18m

$176

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 7/8

7:05 pm-11:42 pm

1 stop4h 37m

San Francisco

Sat 7/12

8:00 am-12:00 pm

1 stop4h 00m

$188

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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 $327). 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 June 12, 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 June 12, 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
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

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

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

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
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

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
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

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 Southwest, with whom users have recently found tickets for as low as $39. 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 $327). 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$30Average$91FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$36Average$88FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$250FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$343FlexibilityNo cancel feeOn-time75%
DeltaCheapest$85Average$212FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$113Average$285FlexibilityNo cancel feeOn-time63%

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