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

22 flights are operational daily from California to Ontario as of April 2026. The most popular departure time for this route is 6:00AM, with 43% of flights per day taking off at noon.

What airlines fly to Ontario?

Southwest, Frontier and United Airlines are the top three most popular airlines that fly to Ontario from California 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 Ontario. Keep in mind that there are 11 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to Ontario?

Average flight duration from California to Ontario depends on which airport you fly into and out of. Flying from San Diego to Los Angeles is 57m on average, while flying from San Jose to Los Angeles is 1h 15m on average. Los Angeles is the most popular airport in Ontario.

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

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

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

As of April 2026, there are 154 flights per week flying from California to Ontario. The most common day of the week flights depart is Wed, with 20% of flights taking off on this day.

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

Prices for flights from California to Ontario Airport refresh daily.

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

As of April 2026, there are 6 operators available to choose from for flights from California to Ontario Airport.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from California to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents required for your trip to Ontario Airport 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 Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$33 Cheap Flights from California to Ontario in 2026

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Find the cheapest flights from California to Los Angeles

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:30 am - 10:44 am

LAS

ONT

1h 14mnonstop

7:44 pm - 8:54 pm

ONT

LAS

1h 10mnonstop

$55Frontier

Wed, Apr 22 - Wed, Apr 22

9:30 am - 10:44 am

LAS

ONT

1h 14mnonstop

7:44 pm - 8:54 pm

ONT

LAS

1h 10mnonstop

$56Frontier

Wed, Apr 22 - Wed, Apr 22

10:41 am - 12:08 pm

STS

ONT

1h 27mnonstop

12:48 pm - 2:20 pm

ONT

STS

1h 32mnonstop

$110Alaska Airlines

Sat, May 2 - Sat, May 9

10:41 am - 12:08 pm

STS

ONT

1h 27mnonstop

12:48 pm - 2:20 pm

ONT

STS

1h 32mnonstop

$117Alaska Airlines

Tue, May 5 - Sat, May 9

1:00 pm - 9:20 pm

STS

ONT

8h 20m

1 stop

5:30 am - 11:25 am

ONT

STS

5h 55m

1 stop

$151Southwest

Sat, Apr 25 - Sat, May 2

4:35 pm - 10:15 pm

STS

ONT

5h 40m

1 stop

5:40 am - 1:30 pm

ONT

STS

7h 50m

1 stop

$156Southwest

Tue, Jun 2 - Sat, Jun 6

5:10 am - 12:14 pm

MFR

ONT

7h 04m

1 stop

4:57 pm - 11:42 pm

ONT

MFR

6h 45m

1 stop

$320Delta

Tue, May 5 - Mon, May 11

6:15 am - 12:35 pm

MFR

ONT

6h 20m

1 stop

4:57 pm - 11:42 pm

ONT

MFR

6h 45m

1 stop

$321Delta

Wed, May 27 - Mon, Jun 1

12:05 pm - 5:52 pm

MRY

ONT

5h 47m

1 stop

1:30 pm - 6:08 pm

ONT

MRY

4h 38m

1 stop

$369United Airlines

Tue, May 5 - Sat, May 9

8:05 am - 12:20 pm

MRY

ONT

4h 15m

1 stop

6:00 am - 11:27 am

ONT

MRY

5h 27m

1 stop

$379United Airlines

Tue, Apr 14 - Sat, Apr 18

Frontier flights from California to Ontario

Our best Frontier deals on California to Ontario flight tickets

Frontier

Apr 22

LAS9:30 amLas Vegas Harry Reid Intl

1h 14m

ONT10:44 amOntario

Apr 22

ONT7:44 pmOntario

1h 10m

LAS8:54 pmLas Vegas Harry Reid Intl

$55

Frontier

Apr 22

LAS9:30 amLas Vegas Harry Reid Intl

1h 14m

ONT10:44 amOntario

Apr 22

ONT7:44 pmOntario

1h 10m

LAS8:54 pmLas Vegas Harry Reid Intl

$56

Frontier

Apr 18

LAS5:41 pmLas Vegas Harry Reid Intl

1h 08m

ONT6:49 pmOntario

Apr 22

ONT11:44 amOntario

1h 15m

LAS12:59 pmLas Vegas Harry Reid Intl

$61

Delta flights from California to Ontario

Our best Delta deals on California to Ontario flight tickets

Delta

May 23

SMF5:00 pmSacramento Intl

5h 45m

1 stop

ONT10:45 pmOntario

May 26

ONT9:50 amOntario

6h 17m

1 stop

SMF4:07 pmSacramento Intl

$188

Delta

Apr 28

SMF5:14 pmSacramento Intl

6h 30m

1 stop

ONT11:44 pmOntario

May 9

ONT5:55 pmOntario

4h 28m

1 stop

SMF10:23 pmSacramento Intl

$239

Delta

Apr 28

RNO6:00 amReno

6h 14m

1 stop

ONT12:14 pmOntario

May 6

ONT5:05 pmOntario

6h 23m

1 stop

RNO11:28 pmReno

$259

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Wed 4/22

9:30 am-10:44 am

Nonstop1h 14m

Ontario

Wed 4/22

7:44 pm-8:54 pm

Nonstop1h 10m

$55

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Wed 4/22

9:30 am-10:44 am

Nonstop1h 14m

Ontario

Wed 4/22

7:44 pm-8:54 pm

Nonstop1h 10m

$56

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 5/2

10:41 am-12:08 pm

Nonstop1h 27m

Ontario

Sat 5/9

12:48 pm-2:20 pm

Nonstop1h 32m

$110

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 5/5

10:41 am-12:08 pm

Nonstop1h 27m

Ontario

Sat 5/9

12:48 pm-2:20 pm

Nonstop1h 32m

$117

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 4/25

1:00 pm-9:20 pm

1 stop8h 20m

Ontario

Sat 5/2

5:30 am-11:25 am

1 stop5h 55m

$151

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 6/2

4:35 pm-10:15 pm

1 stop5h 40m

Ontario

Sat 6/6

5:40 am-1:30 pm

1 stop7h 50m

$156

MedfordOntario

MFR - ONT

MFRONT

Medford

Tue 5/5

5:10 am-12:14 pm

1 stop7h 04m

Ontario

Mon 5/11

4:57 pm-11:42 pm

1 stop6h 45m

$320

MedfordOntario

MFR - ONT

MFRONT

Medford

Wed 5/27

6:15 am-12:35 pm

1 stop6h 20m

Ontario

Mon 6/1

4:57 pm-11:42 pm

1 stop6h 45m

$321

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Tue 5/5

12:05 pm-5:52 pm

1 stop5h 47m

Ontario

Sat 5/9

1:30 pm-6:08 pm

1 stop4h 38m

$369

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Tue 4/14

8:05 am-12:20 pm

1 stop4h 15m

Ontario

Sat 4/18

6:00 am-11:27 am

1 stop5h 27m

$379

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from California to Ontario

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 California to Ontario flight route?

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

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

There are 4 cabin classes available to choose from on California to Ontario 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 California to Ontario flights?

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

Cheap California to Ontario flight deals and tips

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

Best Price Found	$78
Fastest flight time	1h 00m
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from California in the past 72 hours is $78. The best round-trip flight deal from California to Ontario found on momondo in the last 72 hours is $177.

The fastest flight from California to Ontario takes 1h 00m

Direct flights go from California to Ontario every day.

There is 1 airport in Ontario. From California there are direct flights to Ontario (ONT).

Search flight deals

When did momondo last update prices for flights from California to Ontario Airport?
Prices for flights from California to Ontario Airport refresh daily.
How many operators does momondo search for flights from California to Ontario Airport?
As of April 2026, there are 6 operators available to choose from for flights from California to Ontario Airport.
How old do you have to be to fly from California to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from California to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport 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 Ontario Airport. 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 California to Ontario?
momondo data reveals that the most frequently booked plane model on the route from California to Ontario is Boeing 737 MAX 8, representing 18.94% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 13.37%, Boeing 737 MAX 9 at 9.84%, and Airbus A319 at 7.56%.

Best airlines flying from California to Ontario

Compare and see reviews for airlines that fly from California to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $27	Free Cancellation	Rating 5.7 3,008 reviews	Search Frontier flights
Delta	PriceFrom $66	Free Cancellation	Rating 7.9 8,366 reviews	Search Delta flights
United Airlines	PriceFrom $68	Free Cancellation	Rating 7.4 9,530 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $107	Free Cancellation	Rating 7.9 12,143 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $115	Free Cancellation	Rating 8.0 4,335 reviews	Search Southwest flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.1 11,545 reviews	Search American Airlines flights

Why use momondo?

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

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 Ontario from California.

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

All flight searches from California to Ontario on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search for California to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to Ontario from California. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Ontario 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.

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Cheap flights from California to Los Angeles from $33

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from California to Los Angeles departing on 4/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Our best Frontier deals on California to Ontario flight tickets

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Our best Delta deals on California to Ontario flight tickets

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How to get the cheapest flight ticket from California to Ontario

What is the cheapest California to Ontario flight route?

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

Can stopping save me money on California to Ontario flights?

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

What airlines fly to Ontario?

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

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

How long does it take to fly to Ontario?

Cheap California to Ontario flight deals and tips

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

Best Price Found

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Best airlines flying from California to Ontario

Compare and see reviews for airlines that fly from California to Ontario with momondo

Why use momondo?

An easier way to manage your Ontario 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

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Fly your favorite airline to Los Angeles

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

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