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

As of November 2025, there are 113 flights per week flying from California to Ontario. The most common day of the week flights depart is Tue, with 27% of flights taking off on this day.

What airlines fly to Ontario?

Frontier, Southwest and United Airlines are the top three most popular airlines that fly to Ontario from California according to our data. Frontier is the first choice among our users, with 34% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 10 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

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

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 1h 03m on average, while flying from San Jose to Los Angeles is 1h 20m on average. Los Angeles is the most popular airport in Ontario.

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

16 flights are operational daily from California to Ontario as of November 2025. The most popular departure time for this route is 4:00PM, with 37% of flights per day taking off in the afternoon.

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 November 2025, there are 8 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.

$32 Cheap Flights from California to Ontario in 2025/26

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7:05 pm - 8:13 pmLAS-ONT

1h 08mnonstop

6:30 am - 7:37 amONT-LAS

1h 07mnonstop

$58Frontier

Find Deal

Tue, Jan 6 - Thu, Jan 8

8:13 pm - 9:17 pmLAS-ONT

1h 04mnonstop

6:15 am - 7:22 amONT-LAS

1h 07mnonstop

$60Frontier

Find Deal

Wed, Dec 3 - Sat, Dec 6

11:15 am - 12:37 pmSFO-ONT

1h 22mnonstop

1:40 pm - 3:04 pmONT-SFO

1h 24mnonstop

$132United Airlines

Find Deal

Tue, Nov 18 - Tue, Nov 18

10:55 am - 12:17 pmSFO-ONT

1h 22mnonstop

6:00 am - 7:24 amONT-SFO

1h 24mnonstop

$137United Airlines

Find Deal

Wed, Dec 3 - Sun, Dec 7

7:05 am - 8:20 amSJC-ONT

1h 15mnonstop

3:15 pm - 4:30 pmONT-SJC

1h 15mnonstop

$169Southwest

Find Deal

Wed, Dec 10 - Wed, Dec 10

4:45 pm - 6:05 pmOAK-ONT

1h 20mnonstop

6:15 pm - 7:40 pmONT-OAK

1h 25mnonstop

$171Southwest

Find Deal

Sat, Dec 13 - Mon, Dec 15

5:25 am - 12:34 pmSMF-ONT

7h 09m1 stop

6:00 am - 12:01 pmONT-SMF

6h 01m1 stop

$179Delta

Find Deal

Wed, Dec 10 - Wed, Jan 7

5:25 am - 12:34 pmSMF-ONT

7h 09m1 stop

5:03 pm - 11:15 pmONT-SMF

6h 12m1 stop

$191Delta

Find Deal

Thu, Dec 11 - Tue, Jan 6

10:58 am - 4:05 pmSJC-ONT

5h 07m1 stop

6:27 am - 12:01 pmONT-SJC

5h 34m1 stop

$229American Airlines

Find Deal

Fri, Feb 6 - Mon, Feb 9

4:23 pm - 10:13 pmSTS-ONT

5h 50m1 stop

6:22 am - 12:25 pmONT-STS

6h 03m1 stop

$237American Airlines

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Fri, Jan 9 - Sun, Jan 11

Frontier flights from California to Ontario

Our best Frontier deals on California to Ontario flight tickets

Frontier

Jan 6

LAS7:05 pmLas Vegas Harry Reid Intl

1h 08m

ONT8:13 pmOntario

Jan 8

ONT6:30 amOntario

1h 07m

LAS7:37 amLas Vegas Harry Reid Intl

$58

Find similar

Frontier

Dec 3

LAS8:13 pmLas Vegas Harry Reid Intl

1h 04m

ONT9:17 pmOntario

Dec 6

ONT6:15 amOntario

1h 07m

LAS7:22 amLas Vegas Harry Reid Intl

$60

Find similar

Frontier

Dec 12

LAS8:13 pmLas Vegas Harry Reid Intl

1h 04m

ONT9:17 pmOntario

Dec 14

ONT5:18 pmOntario

1h 09m

LAS6:27 pmLas Vegas Harry Reid Intl

$62

Find similar

United Airlines flights from California to Ontario

Our best United Airlines deals on California to Ontario flight tickets

United Airlines

Nov 18

SFO11:15 amSan Francisco

1h 22m

ONT12:37 pmOntario

Nov 18

ONT1:40 pmOntario

1h 24m

SFO3:04 pmSan Francisco

$132

Find similar

United Airlines

Dec 3

SFO10:55 amSan Francisco

1h 22m

ONT12:17 pmOntario

Dec 7

ONT6:00 amOntario

1h 24m

SFO7:24 amSan Francisco

$137

Find similar

United Airlines

Feb 15

SMF4:41 pmSacramento Intl

6h 16m

1 stop

ONT10:57 pmOntario

Feb 25

ONT6:00 amOntario

4h 08m

1 stop

SMF10:08 amSacramento Intl

$193

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Tue 1/6

7:05 pm-8:13 pm

Nonstop1h 08m

Ontario

Thu 1/8

6:30 am-7:37 am

Nonstop1h 07m

$58

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Wed 12/3

8:13 pm-9:17 pm

Nonstop1h 04m

Ontario

Sat 12/6

6:15 am-7:22 am

Nonstop1h 07m

$60

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 11/18

11:15 am-12:37 pm

Nonstop1h 22m

Ontario

Tue 11/18

1:40 pm-3:04 pm

Nonstop1h 24m

$132

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 12/3

10:55 am-12:17 pm

Nonstop1h 22m

Ontario

Sun 12/7

6:00 am-7:24 am

Nonstop1h 24m

$137

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 12/10

7:05 am-8:20 am

Nonstop1h 15m

Ontario

Wed 12/10

3:15 pm-4:30 pm

Nonstop1h 15m

$169

OaklandOntario

OAK - ONT

OAKONT

Oakland

Sat 12/13

4:45 pm-6:05 pm

Nonstop1h 20m

Ontario

Mon 12/15

6:15 pm-7:40 pm

Nonstop1h 25m

$171

SacramentoOntario

SMF - ONT

SMFONT

Sacramento Intl

Wed 12/10

5:25 am-12:34 pm

1 stop7h 09m

Ontario

Wed 1/7

6:00 am-12:01 pm

1 stop6h 01m

$179

SacramentoOntario

SMF - ONT

SMFONT

Sacramento Intl

Thu 12/11

5:25 am-12:34 pm

1 stop7h 09m

Ontario

Tue 1/6

5:03 pm-11:15 pm

1 stop6h 12m

$191

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 2/6

10:58 am-4:05 pm

1 stop5h 07m

Ontario

Mon 2/9

6:27 am-12:01 pm

1 stop5h 34m

$229

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 1/9

4:23 pm-10:13 pm

1 stop5h 50m

Ontario

Sun 1/11

6:22 am-12:25 pm

1 stop6h 03m

$237

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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	$74
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 $74. The best round-trip flight deal from California to Ontario found on momondo in the last 72 hours is $128.

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

Direct flights go from California to Ontario every day.

There is 1 airport near Ontario: 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 November 2025, there are 8 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 16.01% of all bookings. The subsequent popular models are Airbus A320neo at 12.93%, Embraer 175 at 12.34%, and Boeing 737-800 at 12.28%.

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 $24	Free Cancellation	Rating 5.8 3,116 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $46	Free Cancellation	Rating 6.3 8,112 reviews	Search Spirit Airlines flights
United Airlines	PriceFrom $58	Free Cancellation	Rating 7.4 8,998 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $59	Free Cancellation	Rating 8.0 11,237 reviews	Search Alaska Airlines flights
Delta	PriceFrom $98	Free Cancellation	Rating 7.9 8,002 reviews	Search Delta flights
Southwest	PriceFrom $114	Free Cancellation	Rating 8.0 4,237 reviews	Search Southwest flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.2 11,038 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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Airports servicing California

Popular cities in the United States

Flights to New Yorkfrom $49

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Cheap flights from California to Los Angeles from $32

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 2/27. 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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Find the cheapest flights from California to Los Angeles

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Frontier flights from California to Ontario

Our best Frontier deals on California to Ontario flight tickets

United Airlines flights from California to Ontario

Our best United Airlines deals on California to Ontario flight tickets

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Use the filters below to find and compare flights from California to Ontario that are best for you.

See travel insights to Los Angeles from

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

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.

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

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

What airlines fly to Ontario?

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

16 flights are operational daily from California to Ontario as of November 2025. The most popular departure time for this route is 4:00PM, with 37% of flights per day taking off in the afternoon.

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

As of November 2025, there are 113 flights per week flying from California to Ontario. The most common day of the week flights depart is Tue, with 27% of flights taking off on this day.

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 1h 03m on average, while flying from San Jose to Los Angeles is 1h 20m on average. Los Angeles is the most popular airport in 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

Fastest flight time

Direct flights

Airports in Ontario

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

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

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

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

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

Best airlines flying from California to Ontario

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

Why use momondo?

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

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

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

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

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

Airports servicing California