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$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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
ene. 3 — ene. 101
sáb. 1/3
sáb. 1/10
1 adult, Economy
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Cheap 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 diciembre 4, 2025.

This FlightHub deal was found by Cheapflights users on 12/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/116:15 amONT - LAS
Nonstop1h 07mFrontier
vie. 12/1212:02 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 12/1$58
This Super.com deal was found by Cheapflights users on 12/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/146:15 amONT - LAS
Nonstop1h 07mFrontier
lun. 12/158:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/2$59
This Super.com deal was found by Cheapflights users on 12/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/106:15 amONT - LAS
Nonstop1h 07mFrontier
sáb. 12/138:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/2$60
This CheapOair deal was found by Cheapflights users on 12/2. 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.
lun. 12/86:15 amONT - LAS
Nonstop1h 07mFrontier
lun. 12/88:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/2$61
This Frontier deal was found by Cheapflights users on 12/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/156:15 amONT - LAS
Nonstop1h 07mFrontier
vie. 12/198:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/2$62
This CheapOair deal was found by Cheapflights users on 12/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/146:15 amONT - LAS
Nonstop1h 07mFrontier
vie. 12/194:01 pmLAS - ONT
Nonstop1h 08mFrontier
Deal found 12/3$63
This Super.com deal was found by Cheapflights users on 12/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/176:15 amONT - LAS
Nonstop1h 07mFrontier
mié. 12/244:06 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/4$70
This Frontier deal was found by Cheapflights users on 12/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/256:07 pmONT - LAS
Nonstop1h 11mFrontier
mar. 1/62:00 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 12/2$72
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:00 amONT - LAS
Nonstop1h 07mFrontier
mié. 1/78:45 amLAS - ONT
Nonstop1h 05mFrontier
Deal found 12/2$78
This Super.com deal was found by Cheapflights users on 12/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/136:15 amONT - LAS
Nonstop1h 07mFrontier
lun. 12/158:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/2$79
This Frontier deal was found by Cheapflights users on 12/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/136:15 amONT - LAS
Nonstop1h 07mFrontier
sáb. 12/138:13 pmLAS - ONT
Nonstop1h 04mFrontier
Deal found 12/2$80
This Super.com deal was found by Cheapflights users on 12/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/810:12 pmONT - SFO
Nonstop1h 40mFrontier
vie. 12/1210:20 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/2$98

Find flight deals from Ontario to California

Keep the following information in mind while searching for Ontario to California flight deals. Data was last updated diciembre 4, 2025.

Round-trip from

$49
(CheapOair)

One-way from

$32
(Mytrip)

Good round-trip deal

$147 or less

Good one-way deal

$87 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

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 diciembre 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

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mié. 1/7

10:00 am-11:30 am

Nonstop1h 30m

Oakland

mié. 1/7

1:00 pm-2:20 pm

Nonstop1h 20m

$125

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mié. 1/28

10:00 am-11:30 am

Nonstop1h 30m

Oakland

mié. 1/28

12:30 pm-5:10 pm

1 stop4h 40m

$135

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

mié. 3/18

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

sáb. 3/21

3:45 pm-5:12 pm

Nonstop1h 27m

$137

OntarioFresno

ONT - FAT

ONTFAT

Ontario

mié. 12/17

6:15 am-1:39 pm

1 stop7h 24m

Fresno Airterminal

jue. 12/18

9:40 am-5:22 pm

1 stop7h 42m

$147

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

mié. 5/20

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

mar. 5/26

3:45 pm-5:12 pm

Nonstop1h 27m

$157

OntarioRedding

ONT - RDD

ONTRDD

Ontario

mié. 1/28

4:03 pm-2:35 pm

1 stop22h 32m

Redding

sáb. 1/31

3:15 pm-10:59 am

1 stop19h 44m

$162

OntarioRedding

ONT - RDD

ONTRDD

Ontario

mié. 1/28

11:53 am-2:35 pm

1 stop26h 42m

Redding

mar. 2/3

3:15 pm-3:08 pm

1 stop23h 53m

$162

OntarioSacramento

ONT - SMF

ONTSMF

Ontario

mié. 1/14

5:35 pm-7:05 pm

Nonstop1h 30m

Sacramento Intl

jue. 1/15

5:05 am-10:20 am

1 stop5h 15m

$165

OntarioFresno

ONT - FAT

ONTFAT

Ontario

lun. 12/29

6:00 pm-7:45 am

1 stop13h 45m

Fresno Airterminal

lun. 1/5

6:31 pm-3:09 pm

1 stop20h 38m

$171

OntarioOakland

ONT - OAK

ONTOAK

Ontario

lun. 2/9

10:15 am-11:40 am

Nonstop1h 25m

Oakland

mié. 2/11

6:25 am-12:15 pm

2 stops5h 50m

$173

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/4

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, December is the cheapest month in which you can book a flight from Ontario to California (average of $17). Flying from Ontario to California in October is currently the most expensive (average of $58). 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 diciembre 4, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 57% on flights from Ontario to California by exploring options for tickets in the evening.

What is the cheapest day to fly from Ontario to California?

Use this chart to determine the cheapest time to fly round-trip from Ontario to California. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to California flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 diciembre 4, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and United Airlines 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
11,400 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,400 reviews
Alaska Airlines
8.0
Very good
11,400 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,252 reviews
Alaska Airlines
8.0
Very good
11,400 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
9,066 reviews
Alaska Airlines
8.0
Very good
11,400 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
11,044 reviews
Alaska Airlines
8.0
Very good
11,400 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,092 reviews
Alaska Airlines
8.0
Very good
11,400 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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.

  • How long is the flight from Ontario to California?

    Southwest, Alaska Airlines, and United Airlines can get you from Ontario to California in just under 1h 30m. Your travel time can differ by up to 5h 29m. The distance between Ontario and California is about 361 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $19. However, be on the lookout for offers from Avelo Airlines and United Airlines, 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, December is the cheapest month in which you can book a flight from Ontario to California (average of $17). Flying from Ontario to California in October is currently the most expensive (average of $58). 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 5 airlines flying from Ontario to California

Discover the top 5 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 diciembre 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$30Average$118FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$48Average$74FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$59Average$184FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$187FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$283FlexibilityNo cancel feeOn-time63%

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