HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
California

$32+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Apr 9 — Apr 161
Wed 4/9
Wed 4/16
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to California with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 4, 2025.

Round-trip from

$52
(Cheapflightsfares)

One-way from

$32
(Flightnetwork)

Good round-trip deal

$117 or less

Good one-way deal

$59 or less
From Ontario to California
Search Deals
One-way flight from Ontario to California
Search Deals
Price to beat on a round-trip flight from Ontario to California.
Search Deals
Price to beat on a one-way flight from Ontario to California.
Search Deals

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 4, 2025.

This Frontier deal was found by Cheapflights users on 4/3. 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 4/162:43 pmONT - LAS
Nonstop1h 10mFrontier
Wed 4/167:15 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 4/3$55
This United Airlines deal was found by Cheapflights users on 4/3. 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.
Thu 5/11:45 pmONT - SFO
Nonstop1h 28mUnited Airlines
Sat 5/3110:45 amSFO - ONT
Nonstop1h 29mUnited Airlines
Deal found 4/3$57
This Cheapflightsfares deal was found by Cheapflights users on 4/3. 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 5/58:24 amONT - SFO
Nonstop1h 38mFrontier
Thu 5/88:34 amSFO - ONT
Nonstop1h 28mFrontier
Deal found 4/3$58
This CheapOair deal was found by Cheapflights users on 4/2. 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 4/252:42 pmONT - RNO
1 stop4h 27mFrontier
Sun 4/278:09 pmRNO - ONT
1 stop17h 05mFrontier
Deal found 4/2$160
This CheapOair deal was found by Cheapflights users on 4/4. 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.
Wed 4/3012:10 pmONT - SJC
1 stop22h 54mFrontier
Thu 5/17:41 pmSJC - ONT
1 stop11h 43mFrontier
Deal found 4/4$160
This Southwest deal was found by Cheapflights users on 4/3. 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 4/306:20 amONT - OAK
Nonstop1h 20mSouthwest
Wed 4/304:45 pmOAK - ONT
Nonstop1h 25mSouthwest
Deal found 4/3$175
This Southwest deal was found by Cheapflights users on 4/3. 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 4/296:10 amONT - SJC
Nonstop1h 15mSouthwest
Tue 5/68:15 pmSJC - ONT
Nonstop1h 15mSouthwest
Deal found 4/3$175
This Southwest deal was found by Cheapflights users on 4/3. 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 5/15:20 amONT - LAS
1 stop3h 50mSouthwest
Mon 5/56:35 pmLAS - ONT
1 stop4h 25mSouthwest
Deal found 4/3$176
This Southwest deal was found by Cheapflights users on 4/3. 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 5/57:35 pmONT - SFO
1 stop3h 50mSouthwest
Thu 5/85:10 amSFO - ONT
1 stop5h 50mSouthwest
Deal found 4/3$184
This American Airlines deal was found by Cheapflights users on 4/2. 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.
Tue 4/86:15 amONT - SFO
1 stop6h 01mAmerican Airlines
Tue 4/83:54 pmSFO - ONT
1 stop6h 04mAmerican Airlines
Deal found 4/2$193
This Southwest deal was found by Cheapflights users on 4/3. 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 4/241:55 pmONT - SMF
Nonstop1h 25mSouthwest
Wed 4/303:55 pmSMF - ONT
1 stop6h 35mSouthwest
Deal found 4/3$196
This Mytrip deal was found by Cheapflights users on 4/4. 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 5/112:59 amONT - SMF
1 stop10h 07mFrontier
Sun 5/411:56 amSMF - ONT
1 stop23h 30mFrontier
Deal found 4/4$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 4, 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

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 5/8

10:52 am-12:04 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Thu 5/8

2:29 pm-3:39 pm

Nonstop1h 10m

$52

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 4/30

3:55 pm-5:38 pm

Nonstop1h 43m

San Francisco

Wed 4/30

6:55 pm-8:21 pm

Nonstop1h 26m

$52

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 5/5

8:24 am-10:02 am

Nonstop1h 38m

San Francisco

Thu 5/8

8:34 am-10:02 am

Nonstop1h 28m

$58

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 4/26

5:50 am-9:10 am

1 stop3h 20m

Las Vegas Harry Reid Intl

Wed 4/30

6:10 am-10:10 am

1 stop4h 00m

$157

OntarioReno

ONT - RNO

ONTRNO

Ontario

Fri 4/25

2:42 pm-7:09 pm

1 stop4h 27m

Reno

Sun 4/27

8:09 pm-1:14 pm

1 stop17h 05m

$160

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 4/30

12:10 pm-11:04 am

1 stop22h 54m

San Jose

Thu 5/1

7:41 pm-7:24 am

1 stop11h 43m

$160

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 4/16

5:30 am-11:50 am

1 stop6h 20m

San Francisco

Sat 4/19

2:55 pm-9:45 pm

1 stop6h 50m

$174

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 4/30

6:20 am-7:40 am

Nonstop1h 20m

Oakland

Wed 4/30

4:45 pm-6:10 pm

Nonstop1h 25m

$175

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 4/29

6:10 am-7:25 am

Nonstop1h 15m

San Jose

Tue 5/6

8:15 pm-9:30 pm

Nonstop1h 15m

$175

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 4/19

6:15 am-12:16 pm

1 stop6h 01m

San Francisco

Sat 4/19

3:54 pm-9:58 pm

1 stop6h 04m

$193

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/3

Showing 1-10 of 60 results
1
2
3
...
6

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 4, 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 4, 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
9,836 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,836 reviews
Alaska Airlines
8.0
Very good
9,836 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,276 reviews
Alaska Airlines
8.0
Very good
9,836 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,897 reviews
Alaska Airlines
8.0
Very good
9,836 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,347 reviews
Alaska Airlines
8.0
Very good
9,836 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,618 reviews
Alaska Airlines
8.0
Very good
9,836 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $32. 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 - Reno 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to California

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Newark flights
Los Angeles to John F Kennedy Intl flights
Los Angeles to Honolulu flights
San Francisco to John F Kennedy Intl flights
San Francisco to Newark flights
Los Angeles to LaGuardia flights
San Jose to Los Angeles flights
Los Angeles to Boston flights
Los Angeles to Seattle flights
Los Angeles to Miami flights
San Francisco to Los Angeles flights
Los Angeles to Las Vegas flights
Los Angeles to Orlando flights
Los Angeles to San Jose flights
Los Angeles to O'Hare Intl flights
Santa Ana to Las Vegas flights
San Francisco to Honolulu flights
Oakland to Los Angeles flights
Los Angeles to Reagan-National flights
San Francisco to Las Vegas flights
San Francisco to LaGuardia flights
San Francisco to Ontario flights
Los Angeles to Dallas/Fort Worth flights
Burbank to Las Vegas flights
San Francisco to Dallas/Fort Worth flights
Los Angeles to San Francisco flights
Los Angeles to Portland flights
Los Angeles to Dulles Intl flights
Los Angeles to Oakland flights
San Francisco to Seattle flights
Los Angeles to Hobby flights
Burbank to Newark flights
San Francisco to O'Hare Intl flights
San Francisco to Santa Ana flights
San Jose to Seattle flights
San Jose to Las Vegas flights
Oakland to Santa Ana flights
Santa Ana to San Francisco flights
Santa Ana to Seattle flights
San Diego to Seattle flights
Los Angeles to Fort Lauderdale flights
Ontario to San Francisco flights
Oakland to Las Vegas flights
Los Angeles to Sky Harbor Intl flights
Ontario to John F Kennedy Intl flights
Los Angeles to Salt Lake City flights
Los Angeles to Atlanta flights
Burbank to Seattle flights
San Francisco to Dulles Intl flights
Ontario to Seattle flights

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 April 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$26Average$87FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$31Average$116FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$67Average$338FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$74Average$344FlexibilityNo cancel feeOn-time69%
Breeze AirwaysCheapest$78Average$136FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$85Average$229FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$116Average$276FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$273Average$488FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.