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Cheap flights from Ontario to California from $26

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 8/14. 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

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Find the cheapest flights from Ontario to California

Cheap round-trip flights

Frontier Logo
10:28 pm - 11:44 pmONT-LAS
1h 16mnonstop
Frontier Logo
7:45 pm - 8:56 pmLAS-ONT
1h 11mnonstop
$45Frontier
Find Deal
vie., sep. 26 - lun., sep. 29
Frontier Logo
10:13 pm - 11:27 pmONT-LAS
1h 14mnonstop
Frontier Logo
6:30 am - 7:33 amLAS-ONT
1h 03mnonstop
$46Frontier
Find Deal
vie., ago. 29 - dom., ago. 31
United Airlines Logo
1:42 pm - 3:01 pmONT-SFO
1h 19mnonstop
United Airlines Logo
7:10 pm - 8:33 pmSFO-ONT
1h 23mnonstop
$97United Airlines
Find Deal
mar., ago. 19 - mié., ago. 20
Southwest Logo
8:15 am - 9:35 amONT-OAK
1h 20mnonstop
Southwest Logo
9:55 am - 11:15 amOAK-ONT
1h 20mnonstop
$97Southwest
Find Deal
mar., ago. 19 - mié., ago. 20
Southwest Logo
5:45 am - 6:50 amONT-LAS
1h 05mnonstop
Southwest Logo
8:50 am - 9:55 amLAS-ONT
1h 05mnonstop
$97Southwest
Find Deal
mié., ago. 27 - sáb., ago. 30
United Airlines Logo
6:50 pm - 8:09 pmONT-SFO
1h 19mnonstop
United Airlines Logo
4:17 pm - 5:37 pmSFO-ONT
1h 20mnonstop
$128United Airlines
Find Deal
dom., ago. 31 - mar., sep. 2
American Airlines Logo
6:17 am - 6:27 pmONT-SJC
12h 10m1 stop
American Airlines Logo
6:00 am - 4:05 pmSJC-ONT
10h 05m1 stop
$203American Airlines
Find Deal
mié., ago. 27 - mié., sep. 3
American Airlines Logo
6:10 am - 12:03 pmONT-RNO
5h 53m1 stop
American Airlines Logo
6:00 am - 12:01 pmRNO-ONT
6h 01m1 stop
$219American Airlines
Find Deal
sáb., oct. 4 - mié., oct. 8
Alaska Airlines Logo
6:10 pm - 10:55 pmONT-MFR
4h 45m1 stop
Alaska Airlines Logo
5:45 am - 10:44 amMFR-ONT
4h 59m1 stop
$238Alaska Airlines
Find Deal
mar., ago. 19 - mié., ago. 20
Alaska Airlines Logo
11:39 am - 5:06 pmONT-MFR
5h 27m1 stop
Alaska Airlines Logo
1:32 pm - 6:47 pmMFR-ONT
5h 15m1 stop
$240Alaska Airlines
Find Deal
lun., sep. 15 - mar., sep. 16

United Airlines flights from Ontario to California

Our best United Airlines deals on Ontario to California flight tickets
United Airlines
Aug 19
ONT1:42 pmOntario
1h 19m
SFO3:01 pmSan Francisco
Aug 20
SFO7:10 pmSan Francisco
1h 23m
ONT8:33 pmOntario
$97
Find similar
United Airlines
Aug 31
ONT6:50 pmOntario
1h 19m
SFO8:09 pmSan Francisco
Sep 2
SFO4:17 pmSan Francisco
1h 20m
ONT5:37 pmOntario
$128
Find similar
United Airlines
Aug 8
ONT6:10 amOntario
1h 27m
SFO7:37 amSan Francisco
Aug 11
SFO9:25 pmSan Francisco
1h 27m
ONT10:52 pmOntario
$157
Find similar

Frontier flights from Ontario to California

Our best Frontier deals on Ontario to California flight tickets
Frontier
Sep 26
ONT10:28 pmOntario
1h 16m
LAS11:44 pmLas Vegas Harry Reid Intl
Sep 29
LAS7:45 pmLas Vegas Harry Reid Intl
1h 11m
ONT8:56 pmOntario
$45
Find similar
Frontier
Aug 29
ONT10:13 pmOntario
1h 14m
LAS11:27 pmLas Vegas Harry Reid Intl
Aug 31
LAS6:30 amLas Vegas Harry Reid Intl
1h 03m
ONT7:33 amOntario
$46
Find similar
Frontier
Sep 4
ONT6:00 amOntario
1h 11m
LAS7:11 amLas Vegas Harry Reid Intl
Sep 4
LAS10:22 amLas Vegas Harry Reid Intl
1h 16m
ONT11:38 amOntario
$53
Find similar

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 julio 31, 2025.
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

vie. 9/26

10:28 pm-11:44 pm

Nonstop1h 16m

Las Vegas Harry Reid Intl

lun. 9/29

7:45 pm-8:56 pm

Nonstop1h 11m

$45

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

vie. 8/29

10:13 pm-11:27 pm

Nonstop1h 14m

Las Vegas Harry Reid Intl

dom. 8/31

6:30 am-7:33 am

Nonstop1h 03m

$46

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mar. 8/19

1:42 pm-3:01 pm

Nonstop1h 19m

San Francisco

mié. 8/20

7:10 pm-8:33 pm

Nonstop1h 23m

$97

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mar. 8/19

8:15 am-9:35 am

Nonstop1h 20m

Oakland

mié. 8/20

9:55 am-11:15 am

Nonstop1h 20m

$97

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

mié. 8/27

5:45 am-6:50 am

Nonstop1h 05m

Las Vegas Harry Reid Intl

sáb. 8/30

8:50 am-9:55 am

Nonstop1h 05m

$97

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

dom. 8/31

6:50 pm-8:09 pm

Nonstop1h 19m

San Francisco

mar. 9/2

4:17 pm-5:37 pm

Nonstop1h 20m

$128

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

mié. 8/27

6:17 am-6:27 pm

1 stop12h 10m

San Jose

mié. 9/3

6:00 am-4:05 pm

1 stop10h 05m

$203

OntarioReno

ONT - RNO

ONTRNO

Ontario

sáb. 10/4

6:10 am-12:03 pm

1 stop5h 53m

Reno

mié. 10/8

6:00 am-12:01 pm

1 stop6h 01m

$219

OntarioMedford

ONT - MFR

ONTMFR

Ontario

mar. 8/19

6:10 pm-10:55 pm

1 stop4h 45m

Medford

mié. 8/20

5:45 am-10:44 am

1 stop4h 59m

$238

OntarioMedford

ONT - MFR

ONTMFR

Ontario

lun. 9/15

11:39 am-5:06 pm

1 stop5h 27m

Medford

mar. 9/16

1:32 pm-6:47 pm

1 stop5h 15m

$240

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 Jose 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?

No. A direct flight is the cheapest option for a flight between Ontario to California.

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

$26

Fastest flight time

1h 05m

Direct flights

Every day

Airports in California

4 airports
The best one-way flight to California from Ontario in the past 72 hours is $26. The best round-trip flight deal from Ontario to California found on momondo in the last 72 hours is $45.
The fastest flight from Ontario to California takes 1h 05m
Direct flights go from Ontario to California every day.
There are 4 airports near California: Oakland (OAK), San Francisco (SFO), 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 $34Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $37Free CancellationRating
6.3
8,048 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $67Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
DeltaPriceFrom $85Free CancellationRating
8.0
7,981 reviews
Search Delta flights
SouthwestPriceFrom $114Free CancellationRating
8.0
4,246 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.

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