What is the cheapest airline that flies from Ontario to California?

United Airlines, Southwest, and Frontier are the most popular carriers operating from Ontario to California

How many flights depart from Ontario to California on average per week?

165 flights are operational weekly from Ontario to California as of September 2026. The most popular departure day for this route is Sun, with 24% of flights per week taking off on this day.

How many flights depart from Ontario to California on average per day?

The number of flights available between Ontario and California is 23 per day as of September 2026. The most frequent departure time is 6:00AM, with 42% of daily flights leaving at noon.

What airlines fly to California?

Southwest, Frontier and United Airlines are the top three most popular airlines that fly to California from Ontario according to our data. Southwest is the first choice among our users, with 32% of people opting to fly with this airline when traveling to California. Keep in mind that there are 10 different airlines that fly to California on a routine basis, so you have a few additional options to choose from.

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?

As of September 2026, there are 6 operators available to choose from 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.

$40 Cheap Flights from Ontario to California in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to California

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:26 pm - 9:01 pmONT Ontario-SFO San Francisco

1h 35mnonstop

7:41 am - 9:10 amSFO San Francisco-ONT Ontario

1h 29mnonstop

$60Frontier

Tue, Dec 15 - Thu, Dec 17

12:01 pm - 1:32 pmONT Ontario-SFO San Francisco

1h 31mnonstop

6:02 pm - 7:40 pmSFO San Francisco-ONT Ontario

1h 38mnonstop

$61Frontier

Mon, Oct 19 - Mon, Oct 26

1:35 pm - 3:05 pmONT Ontario-SFO San Francisco

1h 30mnonstop

11:00 am - 12:29 pmSFO San Francisco-ONT Ontario

1h 29mnonstop

$117United Airlines

Tue, Oct 27 - Wed, Nov 4

1:52 pm - 3:21 pmONT Ontario-SFO San Francisco

1h 29mnonstop

9:25 pm - 10:51 pmSFO San Francisco-ONT Ontario

1h 26mnonstop

$117United Airlines

Sat, Oct 24 - Sat, Oct 24

6:00 am - 7:15 amONT Ontario-SJC San Jose

1h 15mnonstop

6:45 am - 8:05 amSJC San Jose-ONT Ontario

1h 20mnonstop

$117Southwest

Thu, Oct 15 - Thu, Oct 22

10:25 am - 11:40 amONT Ontario-SJC San Jose

1h 15mnonstop

8:30 am - 9:45 amSJC San Jose-ONT Ontario

1h 15mnonstop

$117Southwest

Mon, Nov 16 - Wed, Nov 18

5:45 pm - 7:25 pmONT Ontario-STS Santa Rosa Sonoma County

1h 40mnonstop

3:32 pm - 5:05 pmSTS Santa Rosa Sonoma County-ONT Ontario

1h 33mnonstop

$157Alaska Airlines

Fri, Oct 30 - Sat, Oct 31

5:45 pm - 7:25 pmONT Ontario-STS Santa Rosa Sonoma County

1h 40mnonstop

3:32 pm - 5:05 pmSTS Santa Rosa Sonoma County-ONT Ontario

1h 33mnonstop

$157Alaska Airlines

Mon, Oct 12 - Sat, Oct 17

6:00 am - 10:41 amONT Ontario-STS Santa Rosa Sonoma County

4h 41m1 stop Salt Lake City

4:49 pm - 11:55 pmSTS Santa Rosa Sonoma County-ONT Ontario

7h 06m1 stop Salt Lake City

$177Delta

Sat, Oct 17 - Mon, Oct 19

6:00 am - 10:41 amONT Ontario-STS Santa Rosa Sonoma County

4h 41m1 stop Salt Lake City

4:49 pm - 11:55 pmSTS Santa Rosa Sonoma County-ONT Ontario

7h 06m1 stop Salt Lake City

$177Delta

Fri, Oct 16 - Mon, Oct 19

Cheap last minute flights

Enter your travel dates to find the best prices.

12:07 pm - 1:43 pmONT Ontario-SFO San Francisco

1h 36mnonstop

6:02 pm - 7:40 pmSFO San Francisco-ONT Ontario

1h 38mnonstop

$123Frontier

Thu, Sep 24 - Thu, Oct 15

12:07 pm - 1:43 pmONT Ontario-SFO San Francisco

1h 36mnonstop

6:02 pm - 7:40 pmSFO San Francisco-ONT Ontario

1h 38mnonstop

$137Frontier

Sun, Sep 27 - Mon, Oct 12

1:52 pm - 3:21 pmONT Ontario-SFO San Francisco

1h 29mnonstop

9:20 pm - 10:48 pmSFO San Francisco-ONT Ontario

1h 28mnonstop

$187United Airlines

Sat, Sep 26 - Mon, Oct 26

1:56 pm - 3:25 pmONT Ontario-SFO San Francisco

1h 29mnonstop

4:15 pm - 5:46 pmSFO San Francisco-ONT Ontario

1h 31mnonstop

$187United Airlines

Tue, Sep 22 - Sat, Oct 10

8:35 am - 1:15 pmONT Ontario-SFO San Francisco

4h 40m1 stop Phoenix Sky Harbor Intl

5:00 am - 8:45 amSFO San Francisco-ONT Ontario

3h 45m1 stop Las Vegas Harry Reid Intl

$214Southwest

Tue, Sep 22 - Sat, Oct 10

5:40 am - 11:35 amONT Ontario-SFO San Francisco

5h 55m1 stop Las Vegas Harry Reid Intl

10:45 pm - 7:50 amSFO San Francisco-ONT Ontario

9h 05m1 stop Las Vegas Harry Reid Intl

$219Southwest

Sat, Sep 26 - Mon, Oct 26

1:05 pm - 7:11 pmONT Ontario-SFO San Francisco

6h 06m1 stop Phoenix Sky Harbor Intl

3:58 pm - 10:43 pmSFO San Francisco-ONT Ontario

6h 45m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Sat, Sep 26 - Sun, Sep 27

1:05 pm - 7:11 pmONT Ontario-SFO San Francisco

6h 06m1 stop Phoenix Sky Harbor Intl

8:00 am - 12:06 pmSFO San Francisco-ONT Ontario

4h 06m1 stop Phoenix Sky Harbor Intl

$277American Airlines

Sat, Sep 26 - Sun, Sep 27

4:27 pm - 6:07 pmONT Ontario-STS Santa Rosa Sonoma County

1h 40mnonstop

3:32 pm - 5:05 pmSTS Santa Rosa Sonoma County-ONT Ontario

1h 33mnonstop

$357Alaska Airlines

Thu, Sep 24 - Thu, Oct 8

4:27 pm - 6:07 pmONT Ontario-STS Santa Rosa Sonoma County

1h 40mnonstop

3:32 pm - 5:05 pmSTS Santa Rosa Sonoma County-ONT Ontario

1h 33mnonstop

$437Alaska Airlines

Sun, Sep 27 - Sun, Oct 4

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Frontier flights from Ontario to California

Our best Frontier deals on Ontario to California flight tickets

Frontier

Dec 15

ONT7:26 pmOntario

1h 35m

SFO9:01 pmSan Francisco

Dec 17

SFO7:41 amSan Francisco

1h 29m

ONT9:10 amOntario

$60

Frontier

Oct 19

ONT12:01 pmOntario

1h 31m

SFO1:32 pmSan Francisco

Oct 26

SFO6:02 pmSan Francisco

1h 38m

ONT7:40 pmOntario

$61

Frontier

Dec 2

ONT7:26 pmOntario

1h 34m

SFO9:00 pmSan Francisco

Dec 8

SFO9:56 pmSan Francisco

1h 27m

ONT11:23 pmOntario

$62

United Airlines flights from Ontario to California

Our best United Airlines deals on Ontario to California flight tickets

United Airlines

Oct 17

ONT1:52 pmOntario

1h 29m

SFO3:21 pmSan Francisco

Oct 17

SFO9:25 pmSan Francisco

1h 26m

ONT10:51 pmOntario

$117

United Airlines

Oct 14

ONT1:52 pmOntario

4h 28m

1 stop

MRY6:20 pmMonterey Regional

Oct 17

MRY11:59 amMonterey Regional

5h 47m

1 stop

ONT5:46 pmOntario

$309

United Airlines

Sep 30

ONT1:52 pmOntario

4h 28m

1 stop

MRY6:20 pmMonterey Regional

Oct 3

MRY2:27 pmMonterey Regional

3h 19m

1 stop

ONT5:46 pmOntario

$349

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 12/15

7:26 pm-9:01 pm

Nonstop1h 35m

San Francisco

Thu 12/17

7:41 am-9:10 am

Nonstop1h 29m

$60

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Mon 10/19

12:01 pm-1:32 pm

Nonstop1h 31m

San Francisco

Mon 10/26

6:02 pm-7:40 pm

Nonstop1h 38m

$61

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Tue 10/27

1:35 pm-3:05 pm

Nonstop1h 30m

San Francisco

Wed 11/4

11:00 am-12:29 pm

Nonstop1h 29m

$117

OntarioSan Francisco

ONT Ontario - SFO San Francisco

ONTSFO

Ontario

Sat 10/24

1:52 pm-3:21 pm

Nonstop1h 29m

San Francisco

Sat 10/24

9:25 pm-10:51 pm

Nonstop1h 26m

$117

OntarioSan Jose

ONT Ontario - SJC San Jose

ONTSJC

Ontario

Thu 10/15

6:00 am-7:15 am

Nonstop1h 15m

San Jose

Thu 10/22

6:45 am-8:05 am

Nonstop1h 20m

$117

Quickest round-trip

OntarioSan Jose

ONT Ontario - SJC San Jose

ONTSJC

Ontario

Mon 11/16

10:25 am-11:40 am

Nonstop1h 15m

San Jose

Wed 11/18

8:30 am-9:45 am

Nonstop1h 15m

$117

OntarioSanta Rosa

ONT Ontario - STS Santa Rosa Sonoma County

ONTSTS

Ontario

Fri 10/30

5:45 pm-7:25 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Sat 10/31

3:32 pm-5:05 pm

Nonstop1h 33m

$157

OntarioSanta Rosa

ONT Ontario - STS Santa Rosa Sonoma County

ONTSTS

Ontario

Mon 10/12

5:45 pm-7:25 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Sat 10/17

3:32 pm-5:05 pm

Nonstop1h 33m

$157

OntarioSanta Rosa

ONT Ontario - STS Santa Rosa Sonoma County

ONTSTS

Ontario

Sat 10/17

6:00 am-10:41 am

1 stop4h 41m

Santa Rosa Sonoma County

Mon 10/19

4:49 pm-11:55 pm

1 stop7h 06m

$177

OntarioSanta Rosa

ONT Ontario - STS Santa Rosa Sonoma County

ONTSTS

Ontario

Fri 10/16

6:00 am-10:41 am

1 stop4h 41m

Santa Rosa Sonoma County

Mon 10/19

4:49 pm-11:55 pm

1 stop7h 06m

$177

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

What is the cheapest month to fly to California?

The month of November is another great option to travel to California, with average flight prices from Ontario averaging around $231.

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?

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	$40
Fastest flight time	1h 04m
Direct flights	Every day
Airports in California	418 airports

The best one-way flight to California from Ontario in the past 72 hours is $40. The best round-trip flight deal from Ontario to California found on momondo in the last 72 hours is $60.

The fastest flight from Ontario to California takes 1h 04m

Direct flights go from Ontario to California every day.

There are 418 airports in California. From Ontario there are direct flights to Las Vegas Harry Reid Intl (LAS).

Search flight deals

Frequently asked questions about flying from Ontario to California

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?
As of September 2026, there are 6 operators available to choose from 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?
Based on momondo bookings for flights between Ontario and California, the leading plane model is Boeing 737-800 Passenger/BBJ2 (winglets), making up 14.04% of the total bookings. Other popular models include Airbus A320neo with 13.30%, Boeing 737 MAX 9 with 11.45%, and Boeing 737 MAX 8 with 10.20%.

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
Frontier	PriceFrom $29	Free Cancellation	Rating 5.6 2,586 reviews	Search Frontier flights
Alaska Airlines	PriceFrom $91	Free Cancellation	Rating 7.9 12,954 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $106	Free Cancellation	Rating 7.4 10,223 reviews	Search United Airlines flights
JetBlue	PriceFrom $120	Free Cancellation	Rating 7.1 3,033 reviews	Search JetBlue flights
Southwest	PriceFrom $137	Free Cancellation	Rating 8.0 4,194 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.