What airlines fly to Ontario?

Southwest, Frontier and Alaska 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 29% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 12 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?

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

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

As of May 2026, there are 138 flights per week flying from California to Ontario. The most common day of the week flights depart is Fri, with 24% 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 01m on average, while flying from San Francisco to Los Angeles is 1h 26m on average. Los Angeles is the most popular airport in Ontario.

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

19 flights are operational daily from California to Ontario as of May 2026. The most popular departure time for this route is 10:00AM, with 52% of flights per day taking off at noon.

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 May 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.

$43 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.

6:46 pm - 7:53 pm

LAS

ONT

1h 07mnonstop

1:28 pm - 2:39 pm

ONT

LAS

1h 11mnonstop

$48Frontier

Wed, Jul 15 - Tue, Jul 21

1:55 pm - 3:08 pm

LAS

ONT

1h 13mnonstop

3:40 pm - 4:51 pm

ONT

LAS

1h 11mnonstop

$49Frontier

Tue, Jun 30 - Wed, Jul 22

9:30 am - 10:50 am

SJC

ONT

1h 20mnonstop

6:10 am - 7:25 am

ONT

SJC

1h 15mnonstop

$117Southwest

Tue, Jun 9 - Tue, Jun 16

5:05 pm - 6:25 pm

SJC

ONT

1h 20mnonstop

4:45 pm - 8:05 pm

ONT

SJC

3h 20m

1 stop

$123Southwest

Tue, Sep 15 - Tue, Sep 29

5:44 pm - 7:08 pm

STS

ONT

1h 24mnonstop

3:35 pm - 5:04 pm

ONT

STS

1h 29mnonstop

$130Alaska Airlines

Sat, Jun 6 - Tue, Jun 9

5:44 pm - 7:08 pm

STS

ONT

1h 24mnonstop

3:35 pm - 5:04 pm

ONT

STS

1h 29mnonstop

$131Alaska Airlines

Tue, Jun 2 - Sat, Jun 6

8:00 am - 12:12 pm

MRY

ONT

4h 12m

1 stop

6:39 pm - 11:47 pm

ONT

MRY

5h 08m

1 stop

$329United Airlines

Fri, May 29 - Tue, Jun 2

2:07 pm - 8:01 pm

MFR

ONT

5h 54m

1 stop

1:56 pm - 6:08 pm

ONT

MFR

4h 12m

1 stop

$329United Airlines

Wed, Aug 19 - Sat, Aug 22

5:29 pm - 10:45 pm

MFR

ONT

5h 16m

1 stop

6:01 pm - 11:15 pm

ONT

MFR

5h 14m

1 stop

$333Delta

Wed, Aug 5 - Sun, Aug 9

5:29 pm - 10:45 pm

MFR

ONT

5h 16m

1 stop

6:20 am - 1:01 pm

ONT

MFR

6h 41m

1 stop

$335Delta

Thu, Aug 6 - Sun, Aug 9

Frontier flights from California to Ontario

Our best Frontier deals on California to Ontario flight tickets

Frontier

Jul 15

LAS6:46 pmLas Vegas Harry Reid Intl

1h 07m

ONT7:53 pmOntario

Jul 21

ONT1:28 pmOntario

1h 11m

LAS2:39 pmLas Vegas Harry Reid Intl

$48

Frontier

Jun 30

LAS1:55 pmLas Vegas Harry Reid Intl

1h 13m

ONT3:08 pmOntario

Jul 22

ONT3:40 pmOntario

1h 11m

LAS4:51 pmLas Vegas Harry Reid Intl

$49

Frontier

Jun 4

LAS1:59 pmLas Vegas Harry Reid Intl

1h 10m

ONT3:09 pmOntario

Jun 6

ONT3:30 pmOntario

1h 13m

LAS4:43 pmLas Vegas Harry Reid Intl

$53

Southwest flights from California to Ontario

Our best Southwest deals on California to Ontario flight tickets

Southwest

Jun 9

SJC9:30 amSan Jose

1h 20m

ONT10:50 amOntario

Jun 16

ONT6:10 amOntario

1h 15m

SJC7:25 amSan Jose

$117

Southwest

Sep 15

SJC5:05 pmSan Jose

1h 20m

ONT6:25 pmOntario

Sep 29

ONT4:45 pmOntario

3h 20m

1 stop

SJC8:05 pmSan Jose

$123

Southwest

Jul 1

SJC6:30 amSan Jose

1h 20m

ONT7:50 amOntario

Jul 8

ONT5:30 amOntario

7h 25m

2 stops

SJC12:55 pmSan Jose

$132

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 7/15

6:46 pm-7:53 pm

Nonstop1h 07m

Ontario

Tue 7/21

1:28 pm-2:39 pm

Nonstop1h 11m

$48

Las VegasOntario

LAS - ONT

LASONT

Las Vegas Harry Reid Intl

Tue 6/30

1:55 pm-3:08 pm

Nonstop1h 13m

Ontario

Wed 7/22

3:40 pm-4:51 pm

Nonstop1h 11m

$49

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 6/9

9:30 am-10:50 am

Nonstop1h 20m

Ontario

Tue 6/16

6:10 am-7:25 am

Nonstop1h 15m

$117

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 9/15

5:05 pm-6:25 pm

Nonstop1h 20m

Ontario

Tue 9/29

4:45 pm-8:05 pm

1 stop3h 20m

$123

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 6/6

5:44 pm-7:08 pm

Nonstop1h 24m

Ontario

Tue 6/9

3:35 pm-5:04 pm

Nonstop1h 29m

$130

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 6/2

5:44 pm-7:08 pm

Nonstop1h 24m

Ontario

Sat 6/6

3:35 pm-5:04 pm

Nonstop1h 29m

$131

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 5/29

8:00 am-12:12 pm

1 stop4h 12m

Ontario

Tue 6/2

6:39 pm-11:47 pm

1 stop5h 08m

$329

MedfordOntario

MFR - ONT

MFRONT

Medford

Wed 8/19

2:07 pm-8:01 pm

1 stop5h 54m

Ontario

Sat 8/22

1:56 pm-6:08 pm

1 stop4h 12m

$329

MedfordOntario

MFR - ONT

MFRONT

Medford

Wed 8/5

5:29 pm-10:45 pm

1 stop5h 16m

Ontario

Sun 8/9

6:01 pm-11:15 pm

1 stop5h 14m

$333

MedfordOntario

MFR - ONT

MFRONT

Medford

Thu 8/6

5:29 pm-10:45 pm

1 stop5h 16m

Ontario

Sun 8/9

6:20 am-1:01 pm

1 stop6h 41m

$335

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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 month to fly to Ontario?

In general, January is the cheapest month to fly from California to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $19. If you aren’t able to travel during the month of January, then book flights to Ontario from California during July instead. Flights to Ontario in July, while not as cheap as those in January, still average around $29.

What is the cheapest California to Ontario flight route?

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

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	$69
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 $69. The best round-trip flight deal from California to Ontario found on momondo in the last 72 hours is $127.

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

Frequently asked questions about flying from California to Ontario

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 May 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 17.33% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 15.10%, Boeing 737 MAX 9 at 9.48%, and Airbus A320neo at 9.20%.

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 $39	Free Cancellation	Rating 5.6 2,951 reviews	Search Frontier flights
Delta	PriceFrom $66	Free Cancellation	Rating 7.9 8,455 reviews	Search Delta flights
United Airlines	PriceFrom $68	Free Cancellation	Rating 7.4 9,727 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $107	Free Cancellation	Rating 7.9 12,371 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $124	Free Cancellation	Rating 8.0 4,298 reviews	Search Southwest flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.1 11,662 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 $43

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 6/8. 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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Frontier flights from California to Ontario

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Our best Southwest 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 month to fly to Ontario?

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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

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Frequently asked questions about flying 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?

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

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