Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to California from $29

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to California departing on 2/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to California

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:18 pm - 11:29 pm
ONT
-
LAS
1h 11mnonstop
Frontier Logo
12:00 pm - 1:11 pm
LAS
-
ONT
1h 11mnonstop
$59Frontier
Sun, Feb 15 - Tue, Feb 17
Frontier Logo
11:44 am - 12:59 pm
ONT
-
LAS
1h 15mnonstop
Frontier Logo
7:00 am - 8:04 am
LAS
-
ONT
1h 04mnonstop
$60Frontier
Thu, Apr 16 - Mon, Apr 20
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:12 pm - 3:42 pm
STS
-
ONT
1h 30mnonstop
$117Alaska Airlines
Thu, Mar 19 - Wed, Mar 25
Multiple Airlines Logo
2:06 pm - 7:46 pm
ONT
-
RNO
5h 40m
1 stop
Multiple Airlines Logo
11:35 am - 6:15 pm
RNO
-
ONT
6h 40m
1 stop
$126Multiple Airlines
Tue, Mar 3 - Sat, Mar 7
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:18 pm - 3:48 pm
STS
-
ONT
1h 30mnonstop
$127Alaska Airlines
Thu, Mar 19 - Sun, Mar 22
Multiple Airlines Logo
2:06 pm - 7:46 pm
ONT
-
RNO
5h 40m
1 stop
Multiple Airlines Logo
8:41 pm - 1:28 pm
RNO
-
ONT
16h 47m
1 stop
$129Multiple Airlines
Tue, Mar 3 - Tue, Mar 10
United Airlines Logo
6:15 am - 10:59 am
ONT
-
MFR
4h 44m
1 stop
United Airlines Logo
6:22 pm - 10:57 pm
MFR
-
ONT
4h 35m
1 stop
$197United Airlines
Wed, Mar 18 - Wed, Mar 25
Southwest Logo
3:35 pm - 4:55 pm
ONT
-
OAK
1h 20mnonstop
Southwest Logo
7:25 am - 8:45 am
OAK
-
ONT
1h 20mnonstop
$215Southwest
Thu, Apr 23 - Sat, Apr 25
Southwest Logo
5:45 am - 7:10 am
ONT
-
OAK
1h 25mnonstop
Southwest Logo
8:55 pm - 10:15 pm
OAK
-
ONT
1h 20mnonstop
$219Southwest
Wed, Mar 18 - Wed, Mar 18
United Airlines Logo
1:40 pm - 6:00 pm
ONT
-
MRY
4h 20m
1 stop
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
$239United Airlines
Wed, Mar 18 - Sat, Mar 21

Frontier flights from Ontario to California

Our best Frontier deals on Ontario to California flight tickets
Frontier
Feb 15
ONT10:18 pmOntario
1h 11m
LAS11:29 pmLas Vegas Harry Reid Intl
Feb 17
LAS12:00 pmLas Vegas Harry Reid Intl
1h 11m
ONT1:11 pmOntario
$59
Frontier
Apr 16
ONT11:44 amOntario
1h 15m
LAS12:59 pmLas Vegas Harry Reid Intl
Apr 20
LAS7:00 amLas Vegas Harry Reid Intl
1h 04m
ONT8:04 amOntario
$60
Frontier
Feb 22
ONT10:18 pmOntario
1h 11m
LAS11:29 pmLas Vegas Harry Reid Intl
Feb 23
LAS4:39 pmLas Vegas Harry Reid Intl
1h 09m
ONT5:48 pmOntario
$61

American Airlines flights from Ontario to California

Our best American Airlines deals on Ontario to California flight tickets
American Airlines
Feb 25
ONT6:15 amOntario
6h 07m
1 stop
SJC12:22 pmSan Jose
Feb 28
SJC6:00 amSan Jose
5h 36m
1 stop
ONT11:36 amOntario
$229
American Airlines
Mar 14
ONT9:53 amOntario
6h 00m
1 stop
STS3:53 pmSanta Rosa Sonoma County
Mar 17
STS4:23 pmSanta Rosa Sonoma County
5h 44m
1 stop
ONT10:07 pmOntario
$237
American Airlines
Feb 14
ONT9:53 amOntario
5h 54m
1 stop
STS3:47 pmSanta Rosa Sonoma County
Feb 18
STS4:23 pmSanta Rosa Sonoma County
5h 56m
1 stop
ONT10:19 pmOntario
$327

momondo 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, momondo users made 832,500 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 2/15

10:18 pm-11:29 pm

Nonstop1h 11m

Las Vegas Harry Reid Intl

Tue 2/17

12:00 pm-1:11 pm

Nonstop1h 11m

$59

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 4/16

11:44 am-12:59 pm

Nonstop1h 15m

Las Vegas Harry Reid Intl

Mon 4/20

7:00 am-8:04 am

Nonstop1h 04m

$60

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 3/19

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Wed 3/25

2:12 pm-3:42 pm

Nonstop1h 30m

$117

OntarioReno

ONT - RNO

ONTRNO

Ontario

Tue 3/3

2:06 pm-7:46 pm

1 stop5h 40m

Reno

Sat 3/7

11:35 am-6:15 pm

1 stop6h 40m

$126

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 3/19

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 3/22

2:18 pm-3:48 pm

Nonstop1h 30m

$127

OntarioReno

ONT - RNO

ONTRNO

Ontario

Tue 3/3

2:06 pm-7:46 pm

1 stop5h 40m

Reno

Tue 3/10

8:41 pm-1:28 pm

1 stop16h 47m

$129

OntarioMedford

ONT - MFR

ONTMFR

Ontario

Wed 3/18

6:15 am-10:59 am

1 stop4h 44m

Medford

Wed 3/25

6:22 pm-10:57 pm

1 stop4h 35m

$197

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Thu 4/23

3:35 pm-4:55 pm

Nonstop1h 20m

Oakland

Sat 4/25

7:25 am-8:45 am

Nonstop1h 20m

$215

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 3/18

5:45 am-7:10 am

Nonstop1h 25m

Oakland

Wed 3/18

8:55 pm-10:15 pm

Nonstop1h 20m

$219

OntarioMonterey

ONT - MRY

ONTMRY

Ontario

Wed 3/18

1:40 pm-6:00 pm

1 stop4h 20m

Monterey Regional

Sat 3/21

7:00 pm-10:57 pm

1 stop3h 57m

$239

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to California from

How to get the cheapest flight ticket from Ontario to California

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest Ontario to California flight route?

Fly from Ontario to San Francisco for the best Ontario - California flight prices

What cabin class options are available on Ontario to California flights?

There are 4 cabin classes available to choose from on Ontario to California flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to California flights?

You could potentially save up to 37% on your flight if you consider stops on a Ontario to California flight.

Cheap Ontario to California flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to California

Best Price Found

$131

Fastest flight time

1h 05m

Direct flights

Every day

Airports in California

418 airports
The best one-way flight to California from Ontario in the past 72 hours is $131. The best round-trip flight deal from Ontario to California found on momondo in the last 72 hours is $137.
The fastest flight from Ontario to California takes 1h 05m
Direct flights go from Ontario to California every day.
There are 418 airports in California. From Ontario there are direct flights to San Jose (SJC), Las Vegas Harry Reid Intl (LAS).
Search flight deals

  • When did momondo last update prices for flights from Ontario Airport to California?

    Prices for flights from Ontario Airport to California refresh daily.

  • How many operators does momondo search for flights from Ontario Airport to California?

  • How old do you have to be to fly from Ontario Airport to California?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to California.

  • What documentation or ID do you need to fly to California?

    The travel and health documents required for your trip to California can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at California. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Ontario to California?

Best airlines flying from Ontario to California

Compare and see reviews for airlines that fly from Ontario to California with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $31Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
9,235 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $67Free CancellationRating
8.0
11,835 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $97Free CancellationRating
8.0
4,273 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to California?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to California from Ontario.

Can I find flights from Ontario to California with flexible booking policies on momondo?

Flights from Ontario to California with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to California?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to California from Ontario.

I’m not ready to book a flight from Ontario to California right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to California flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your California trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 3/5
Thu 3/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to California

Popular cities in California

Popular flights according to clicks in the last 7 days on momondo
Flights to New Yorkfrom $49
Flights to Los Angelesfrom $46
Flights to Miamifrom $27
Flights to Chicagofrom $49
Flights to Orlandofrom $50
Flights to San Franciscofrom $54
Flights to Las Vegasfrom $49
Flights to Washington, D.C.from $51
Flights to Bostonfrom $51
Flights to Atlantafrom $49
Flights to Dallasfrom $49
Flights to Seattlefrom $83