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$38+ 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 6/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Round-trip from

$57
(United Airlines)

One-way from

$40
(Frontier)

Good round-trip deal

$80 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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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 May 1, 2025.

This United Airlines deal was found by Cheapflights users on 4/30. 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.
Thu 5/291:36 pmONT - SFO
Nonstop1h 27mUnited Airlines
Thu 6/54:12 pmSFO - ONT
Nonstop1h 27mUnited Airlines
Deal found 4/30$57
This Cheapflightsfares deal was found by Cheapflights users on 4/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/259:41 pmONT - SFO
Nonstop1h 33mFrontier
Sun 7/2710:11 pmSFO - ONT
Nonstop1h 29mFrontier
Deal found 4/30$67
This Cheapflightsfares deal was found by Cheapflights users on 4/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/92:28 pmONT - LAS
Nonstop1h 11mFrontier
Tue 5/1311:00 amLAS - ONT
Nonstop1h 08mFrontier
Deal found 4/30$71
This Southwest deal was found by Cheapflights users on 4/30. 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.
Wed 5/73:40 pmONT - SFO
2 stops7h 00mSouthwest
Thu 5/85:10 amSFO - ONT
1 stop5h 50mSouthwest
Deal found 4/30$164
This Frontier deal was found by Cheapflights users on 4/30. 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.
Tue 5/1312:59 amONT - RNO
1 stop10h 17mFrontier
Wed 5/2112:06 pmRNO - ONT
1 stop11h 02mFrontier
Deal found 4/30$170
This Southwest deal was found by Cheapflights users on 4/30. 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.
Sat 5/247:00 amONT - OAK
Nonstop1h 20mSouthwest
Tue 5/278:30 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 4/30$175
This Travelocity deal was found by Cheapflights users on 4/30. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2111:51 amONT - SFO
1 stop8h 19mMultiple Airlines
Sat 5/2410:11 pmSFO - ONT
Nonstop1h 25mMultiple Airlines
Deal found 4/30$175
This Southwest deal was found by Cheapflights users on 4/29. 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.
Wed 5/217:00 pmONT - SJC
Nonstop1h 10mSouthwest
Sun 5/259:15 amSJC - ONT
Nonstop1h 15mSouthwest
Deal found 4/29$175
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1411:58 pmONT - SJC
1 stop11h 06mFrontier
Sun 5/1812:20 pmSJC - ONT
1 stop11h 39mFrontier
Deal found 4/29$180
This CheapOair deal was found by Cheapflights users on 4/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1510:15 pmONT - SMF
1 stop14h 13mFrontier
Sun 5/1810:33 amSMF - ONT
1 stop20h 51mFrontier
Deal found 4/30$190
This American Airlines deal was found by Cheapflights users on 4/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/96:01 amONT - SFO
1 stop6h 54mAmerican Airlines
Fri 5/93:50 pmSFO - ONT
1 stop6h 07mAmerican Airlines
Deal found 4/30$193
This Delta deal was found by Cheapflights users on 4/28. 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.
Wed 5/2110:01 amONT - SMF
1 stop6h 19mDelta
Thu 5/225:15 pmSMF - ONT
1 stop6h 27mDelta
Deal found 4/28$196

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 May 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

Thu 5/29

1:36 pm-3:03 pm

Nonstop1h 27m

San Francisco

Thu 6/5

4:12 pm-5:39 pm

Nonstop1h 27m

$57

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 7/25

9:41 pm-11:14 pm

Nonstop1h 33m

San Francisco

Sun 7/27

10:11 pm-11:40 pm

Nonstop1h 29m

$67

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 5/23

6:00 am-7:16 am

Nonstop1h 16m

Las Vegas Harry Reid Intl

Fri 5/23

10:35 am-11:43 am

Nonstop1h 08m

$71

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 5/7

3:40 pm-10:40 pm

2 stops7h 00m

San Francisco

Thu 5/8

5:10 am-11:00 am

1 stop5h 50m

$164

OntarioReno

ONT - RNO

ONTRNO

Ontario

Tue 5/13

12:59 am-11:16 am

1 stop10h 17m

Reno

Wed 5/21

12:06 pm-11:08 pm

1 stop11h 02m

$170

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 5/28

7:55 am-9:00 am

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 6/4

10:40 am-3:35 pm

2 stops4h 55m

$172

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 5/21

11:51 am-8:10 pm

1 stop8h 19m

San Francisco

Sat 5/24

10:11 pm-11:36 pm

Nonstop1h 25m

$175

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sat 5/24

7:00 am-8:20 am

Nonstop1h 20m

Oakland

Tue 5/27

8:30 pm-9:50 pm

Nonstop1h 20m

$175

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 5/24

6:35 pm-7:50 pm

Nonstop1h 15m

San Jose

Sun 5/25

9:15 am-10:30 am

Nonstop1h 15m

$175

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 5/15

10:52 am-6:41 pm

1 stop7h 49m

San Jose

Sun 5/18

12:20 pm-11:59 pm

1 stop11h 39m

$180

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/1

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 May 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.

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 May 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. 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
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

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
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

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
4,294 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

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
7,934 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

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
2,409 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

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 Frontier, with whom users have recently found tickets for as low as $40. 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 - 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 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 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$30Average$90FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$31Average$111FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$60Average$348FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$359FlexibilityNo 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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