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$34+ 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 3/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Feb 2 — Feb 91
Sun 2/2
Sun 2/9
1 adult, Economy
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Cheap flight deals from Ontario to California

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to California (USCA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 28, 2025.

Round-trip from

$37
(Kiwi.com)

One-way from

$34
(Cheapflightsfares)

Good round-trip deal

$81 or less

Good one-way deal

$57 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 January 28, 2025.

This Frontier deal was found by Cheapflights users on 1/27. 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 3/219:35 pmONT - LAS
Nonstop1h 13mFrontier
Sun 3/236:20 amLAS - ONT
Nonstop1h 06mFrontier
Deal found 1/27$55
This Cheapflightsfares deal was found by Cheapflights users on 1/27. 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 2/248:26 amONT - SFO
Nonstop1h 36mFrontier
Mon 3/38:06 amSFO - ONT
Nonstop1h 28mFrontier
Deal found 1/27$55
This United Airlines deal was found by Cheapflights users on 1/27. 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.
Mon 2/247:40 pmONT - SFO
Nonstop1h 33mUnited Airlines
Tue 2/257:10 pmSFO - ONT
Nonstop1h 30mUnited Airlines
Deal found 1/27$57
This Frontier deal was found by Cheapflights users on 1/27. 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 3/2410:44 amONT - RNO
1 stop7h 53mFrontier
Wed 3/2612:27 pmRNO - ONT
1 stop11h 42mFrontier
Deal found 1/27$100
This Frontier deal was found by Cheapflights users on 1/27. 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 2/2010:24 amONT - SJC
1 stop6h 22mFrontier
Mon 2/244:03 pmSJC - ONT
1 stop7h 56mFrontier
Deal found 1/27$100
This Frontier deal was found by Cheapflights users on 1/27. 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 3/512:59 amONT - SMF
1 stop11h 28mFrontier
Thu 3/131:27 pmSMF - ONT
1 stop10h 42mFrontier
Deal found 1/27$109
This Southwest deal was found by Cheapflights users on 1/27. 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 2/258:30 amONT - LAS
1 stop3h 45mSouthwest
Tue 3/44:40 pmLAS - ONT
1 stop3h 40mSouthwest
Deal found 1/27$157
This Southwest deal was found by Cheapflights users on 1/26. 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 2/256:35 pmONT - SJC
1 stop3h 35mSouthwest
Tue 3/412:50 pmSJC - ONT
1 stop4h 55mSouthwest
Deal found 1/26$157
This Southwest deal was found by Cheapflights users on 1/27. 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 2/266:45 amONT - SFO
1 stop4h 40mSouthwest
Wed 2/263:15 pmSFO - ONT
1 stop6h 30mSouthwest
Deal found 1/27$188
This Southwest deal was found by Cheapflights users on 1/26. 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 2/2511:50 amONT - OAK
Nonstop1h 20mSouthwest
Tue 3/49:05 amOAK - ONT
Nonstop1h 25mSouthwest
Deal found 1/26$197
This Delta deal was found by Cheapflights users on 1/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/275:10 pmONT - RNO
1 stop6h 27mDelta
Mon 3/35:35 pmRNO - ONT
1 stop6h 16mDelta
Deal found 1/28$198
This American Airlines deal was found by Cheapflights users on 1/27. 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 1/316:10 amONT - SFO
1 stop6h 20mAmerican Airlines
Sat 2/15:55 amSFO - ONT
1 stop6h 03mAmerican Airlines
Deal found 1/27$199

Find flights from Ontario to California within your budget

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 January 28, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 2/12

2:43 pm-3:58 pm

Nonstop1h 15m

Las Vegas Harry Reid Intl

Fri 2/14

2:10 pm-3:19 pm

Nonstop1h 09m

$53

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 3/6

8:26 am-10:02 am

Nonstop1h 36m

San Francisco

Mon 3/10

8:16 am-9:44 am

Nonstop1h 28m

$54

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 2/24

7:40 pm-9:13 pm

Nonstop1h 33m

San Francisco

Tue 2/25

7:10 pm-8:40 pm

Nonstop1h 30m

$57

OntarioReno

ONT - RNO

ONTRNO

Ontario

Mon 3/24

10:44 am-6:37 pm

1 stop7h 53m

Reno

Wed 3/26

12:27 pm-12:09 am

1 stop11h 42m

$100

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 2/20

10:24 am-4:46 pm

1 stop6h 22m

San Jose

Mon 2/24

4:03 pm-11:59 pm

1 stop7h 56m

$100

OntarioSacramento

ONT - SMF

ONTSMF

Ontario

Wed 3/5

12:59 am-12:27 pm

1 stop11h 28m

Sacramento Intl

Thu 3/13

1:27 pm-12:09 am

1 stop10h 42m

$109

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 2/25

9:00 am-10:05 am

Nonstop1h 05m

Las Vegas Harry Reid Intl

Tue 3/4

8:40 pm-9:45 pm

Nonstop1h 05m

$137

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 2/25

6:35 pm-10:10 pm

1 stop3h 35m

San Jose

Tue 3/4

12:50 pm-5:45 pm

1 stop4h 55m

$157

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 2/26

6:45 am-11:25 am

1 stop4h 40m

San Francisco

Wed 2/26

3:15 pm-9:45 pm

1 stop6h 30m

$188

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 2/25

11:50 am-1:10 pm

Nonstop1h 20m

Oakland

Tue 3/4

9:05 am-10:30 am

Nonstop1h 25m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

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.

Travel insights for flights from Ontario to California

Get recent, data-driven insights about flights from Ontario to California including ideal travel times, pricing trends, and more.

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 $344). 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 January 28, 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 January 28, 2025.
Get a feel of what it's like to fly with Frontier, United Airlines and American Airlines 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.
Southwest
8.1
Very good
4,608 reviews

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
4,608 reviews
Southwest
8.1
Very good
4,608 reviews

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,689 reviews
Southwest
8.1
Very good
4,608 reviews

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,468 reviews
Southwest
8.1
Very good
4,608 reviews

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Hawaiian Airlines
7.9
Good
2,325 reviews
Southwest
8.1
Very good
4,608 reviews

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

JetBlue
7.4
Good
3,166 reviews
Southwest
8.1
Very good
4,608 reviews

Food

7.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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 $34. 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?

    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 $344). 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 8 airlines flying from Ontario to California

Discover the top 8 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 January 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$26Average$88FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$31Average$117FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$45Average$319FlexibilityNo cancel feeOn-time75%
DeltaCheapest$50Average$251FlexibilityNo cancel feeOn-timeN/A
Breeze AirwaysCheapest$73Average$138FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$109Average$313FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$180Average$271FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$273Average$486FlexibilityNo cancel feeOn-time71%
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