What are the cheapest airlines to fly from California to Ontario one-way?

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $48. Users have also found prices from $95 and $104 on Delta and American Airlines, respectively.

Currently, October is the cheapest month in which you can book a flight from California to Ontario (average of $237). Flying from California to Ontario in June is currently the most expensive (average of $341). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How recently were the California to Ontario flight deals updated?

The California to Ontario flight deals you see on this page were last updated on 5/5.

What are the most popular routes from California to Ontario?

When deciding which route to take from California to Ontario consider San Francisco - Ontario, San Jose - Ontario or Sacramento Intl - Ontario as they are the most popular.

Can I find flights from California to Ontario for under $100 on Cheapflights?

Yes, there are multiple flights from California to Ontario for under $100. The cheapest flight booked recently is on Frontier for just $70, but on average you can expect to pay $77.

Are there nonstop flights from California to Ontario for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from California to Ontario under $100. A good price for a nonstop flight from California to Ontario is less than $49.

Are there last-minute flights available from California to Ontario for under $100?

There are currently 20+ open flights from California to Ontario within the next 7 days for less than $100.

What airport do you fly into for flights to Ontario from California?

Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from California.

What does LAX to ONT mean?

Los Angeles Airport is LAX and Ontario Airport is ONT. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service. San Francisco Airport (SFO), San Diego Airport (SAN), Santa Ana J. Wayne/Orange Cnty Airport (SNA), San Jose Airport (SJC), Sacramento Intl Airport (SMF) are some additional IATA codes for airports related to your trip.

Can I find deals for flights from California to Ontario that include extra baggage allowance?

The amount of baggage you can bring on your California to Ontario flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

Can I find deals on flights from California to Ontario with specific airlines?

Yes, Cheapflights allows you to browse and filter California to Ontario flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

Can I find deals for flights from California to Ontario that include hotel bookings?

Yes. In addition to deals on California to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from California to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to Ontario.

Can I find deals for business class flights from California to Ontario?

Yes. Cheapflights offers flight deals from California to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Can I find deals for flights from California to Ontario that allow pets onboard?

Many airlines flying from California to Ontario offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

Can I find deals on last-minute flights from California to Ontario?

Yes, you can often find last-minute deals on California to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

Flights from California (CA) to Ontario, CA from $38

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When is the cheapest time to fly from California to Ontario (CA - ONT)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from California to Ontario as you normally would.

Cheap Frontier flights from California to Ontario

Consider these cheap Frontier flights we've found departing from California to Ontario. Be sure to come back soon if the deals available don't appeal to you at this time.

Sat 6/85:45 amSFO - ONT

Nonstop1h 23mFrontier

Mon 8/57:36 amONT - SFO

Nonstop1h 26mFrontier

Deal found 5/4$70

Sun 5/1210:10 amSFO - ONT

Nonstop1h 29mFrontier

Tue 5/147:53 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/4$71

Fri 5/175:15 amSFO - ONT

Nonstop1h 24mFrontier

Sun 5/197:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$72

Fri 8/98:28 amSMF - ONT

Nonstop1h 21mFrontier

Tue 8/1310:39 amONT - SMF

Nonstop1h 23mFrontier

Deal found 5/4$73

Thu 6/65:45 amSFO - ONT

Nonstop1h 23mFrontier

Fri 6/148:16 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$74

Sat 5/185:15 amSFO - ONT

Nonstop1h 24mFrontier

Sun 5/197:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$75

Tue 7/168:28 amSMF - ONT

Nonstop1h 21mFrontier

Tue 7/2310:39 amONT - SMF

Nonstop1h 23mFrontier

Deal found 5/4$76

Mon 6/175:45 amSFO - ONT

Nonstop1h 23mFrontier

Sun 6/307:59 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/4$77

Mon 9/238:28 amSMF - ONT

Nonstop1h 21mFrontier

Fri 9/2710:39 amONT - SMF

Nonstop1h 23mFrontier

Deal found 5/4$78

Cheap Southwest flights from California to Ontario

To aid your search, here are some of the cheapest Southwest flights we've found from California to Ontario. Ensure the flight price, dates, time, and airline match your criteria before you book.

Tue 6/188:05 amSJC - ONT

Nonstop1h 20mSouthwest

Thu 6/203:40 pmONT - SJC

Nonstop1h 10mSouthwest

Deal found 5/5$185

Tue 6/184:45 pmSJC - ONT

Nonstop1h 15mSouthwest

Thu 6/206:10 pmONT - SJC

1 stop4h 10mSouthwest

Deal found 5/5$186

Tue 6/184:45 pmSJC - ONT

Nonstop1h 15mSouthwest

Thu 6/205:15 amONT - SJC

2 stops9h 15mSouthwest

Deal found 5/5$191

Tue 6/186:15 amOAK - ONT

1 stop5h 10mSouthwest

Thu 6/204:20 pmONT - OAK

1 stop3h 35mSouthwest

Deal found 5/3$195

Cheap California to Ontario flights in May & June 2024

These are some of the most attractive deals on flights from California to Ontario in 2024. If these deals don't appeal to you, be sure to come back soon for more options.

Wed 5/810:15 amSFO - ONT

Nonstop1h 29mFrontier

Wed 5/157:58 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/5$84

Sun 5/195:15 amSFO - ONT

Nonstop1h 24mFrontier

Mon 5/207:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$86

Tue 5/215:15 amSFO - ONT

Nonstop1h 24mFrontier

Thu 5/237:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$87

Thu 5/910:15 amSFO - ONT

Nonstop1h 29mFrontier

Thu 5/167:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$89

Sat 5/118:27 pmSFO - ONT

Nonstop1h 30mFrontier

Sun 5/127:53 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/4$90

Sun 5/195:15 amSFO - ONT

Nonstop1h 24mFrontier

Thu 5/237:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$92

Sun 5/195:15 amSFO - ONT

Nonstop1h 24mFrontier

Thu 5/237:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$93

Sat 5/185:15 amSFO - ONT

Nonstop1h 24mFrontier

Mon 5/207:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$95

Fri 5/175:15 amSFO - ONT

Nonstop1h 24mFrontier

Mon 5/207:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$96

California to Ontario 2024 flight deals

These are some of the most attractive deals on flights from California to Ontario in 2024. If these deals don't appeal to you, be sure to come back soon for more options.

Sat 5/185:15 amSFO - ONT

Nonstop1h 24mFrontier

Sun 5/197:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$75

Tue 7/168:28 amSMF - ONT

Nonstop1h 21mFrontier

Tue 7/2310:39 amONT - SMF

Nonstop1h 23mFrontier

Deal found 5/4$76

Fri 5/175:15 amSFO - ONT

Nonstop1h 24mFrontier

Sun 5/197:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$76

Mon 6/175:45 amSFO - ONT

Nonstop1h 23mFrontier

Sun 6/307:59 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/4$77

Mon 9/238:28 amSMF - ONT

Nonstop1h 21mFrontier

Fri 9/2710:39 amONT - SMF

Nonstop1h 23mFrontier

Deal found 5/4$78

Fri 5/175:15 amSFO - ONT

Nonstop1h 24mFrontier

Mon 5/207:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$78

Tue 5/215:15 amSFO - ONT

Nonstop1h 24mFrontier

Sat 5/257:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$79

Thu 7/115:15 amSFO - ONT

Nonstop1h 21mFrontier

Mon 7/157:36 amONT - SFO

Nonstop1h 26mFrontier

Deal found 5/4$80

Thu 7/45:45 amSFO - ONT

Nonstop1h 23mFrontier

Sat 7/67:36 amONT - SFO

Nonstop1h 26mFrontier

Deal found 5/3$81

Non-stop flights to Ontario from California

To help reduce your travel time, choose from one of these non-stop flights from California to Ontario. Those looking to potentially save on 1 or 2-stop flights from California to Ontario should utilize the search form at the the top of the page.

Wed 5/225:15 amSFO - ONT

Nonstop1h 24mFrontier

Tue 5/287:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$38

Tue 6/115:45 amSFO - ONT

Nonstop1h 23mFrontier

Sat 6/157:59 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/4$39

Tue 5/215:15 amSFO - ONT

Nonstop1h 24mFrontier

Wed 5/227:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$40

Tue 5/215:15 amSFO - ONT

Nonstop1h 24mFrontier

Tue 5/287:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$41

Tue 5/215:15 amSFO - ONT

Nonstop1h 24mFrontier

Wed 5/227:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$42

Thu 5/165:15 amSFO - ONT

Nonstop1h 24mFrontier

Wed 5/297:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/5$43

Sun 5/195:15 amSFO - ONT

Nonstop1h 24mFrontier

Tue 5/217:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/3$47

Wed 5/295:15 amSFO - ONT

Nonstop1h 24mFrontier

Sun 6/27:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$48

Sat 6/15:15 amSFO - ONT

Nonstop1h 24mFrontier

Mon 6/37:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$49

California to Ontario flights leaving soon

Consider one of these great deals we found on last-minute flights from California to Ontario. Users should be sure to double check the price, date, and time of their last-minute flight.

Tue 5/1410:10 amSFO - ONT

Nonstop1h 29mFrontier

Sat 5/1811:17 pmONT - SFO

1 stop8h 26mFrontier

Deal found 5/4$99

Sat 5/118:27 pmSFO - ONT

Nonstop1h 30mFrontier

Sun 5/127:53 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/4$100

Sat 5/118:27 pmSFO - ONT

Nonstop1h 30mFrontier

Sat 5/187:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$102

Wed 5/1510:15 amSFO - ONT

Nonstop1h 29mFrontier

Sat 5/1812:59 amONT - SFO

1 stop7h 11mFrontier

Deal found 5/5$103

Sun 5/1210:10 amSFO - ONT

Nonstop1h 29mFrontier

Mon 5/1310:59 pmONT - SFO

1 stop8h 44mFrontier

Deal found 5/3$109

Tue 5/1410:10 amSFO - ONT

Nonstop1h 29mFrontier

Fri 5/1712:59 amONT - SFO

1 stop7h 22mFrontier

Deal found 5/4$113

Sun 5/1210:10 amSFO - ONT

Nonstop1h 29mFrontier

Mon 5/1311:07 pmONT - SFO

2 stops12h 16mFrontier

Deal found 5/3$114

Tue 5/1412:23 pmSFO - ONT

2 stops7h 24mFrontier

Sat 5/187:39 amONT - SFO

Nonstop1h 28mFrontier

Deal found 5/4$117

Sun 5/1210:10 amSFO - ONT

Nonstop1h 29mFrontier

Mon 5/137:53 amONT - SFO

Nonstop1h 27mFrontier

Deal found 5/3$123

One-way flights to Ontario from California

Take a look at some of the best available options we've come across on one-way flights from California to Ontario. Users needing a return flight from California to Ontario should utilize the search form above.

Mon 6/175:45 amSFO - ONT

Nonstop1h 23mFrontier

Deal found 5/4$48

Fri 5/245:15 amSFO - ONT

Nonstop1h 24mFrontier

Deal found 5/4$50

Sat 8/38:28 amSMF - ONT

Nonstop1h 21mFrontier

Deal found 5/4$54

Sat 8/38:28 amSMF - ONT

Nonstop1h 21mFrontier

Deal found 5/3$59

Sat 5/118:27 pmSFO - ONT

Nonstop1h 30mFrontier

Deal found 5/5$65

Sat 5/118:27 pmSFO - ONT

Nonstop1h 30mFrontier

Deal found 5/4$66

Mon 8/58:28 amSMF - ONT

Nonstop1h 21mFrontier

Deal found 5/5$69

Mon 9/165:15 amSFO - ONT

Nonstop1h 21mFrontier

Deal found 5/4$73

Sun 9/18:28 amSMF - ONT

Nonstop1h 21mFrontier

Deal found 5/3$74

Find flights from California to Ontario within your budget

Fly from

Fly to

Budget

$70 - $208

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 6/8

Nonstop1h 23m

Ontario

Mon 8/5

Nonstop1h 26m

$70

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sun 5/12

Nonstop1h 29m

Ontario

Tue 5/14

Nonstop1h 27m

$71

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 5/17

Nonstop1h 24m

Ontario

Sun 5/19

Nonstop1h 28m

$72

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 6/14

Nonstop1h 23m

Ontario

Sun 6/16

Nonstop1h 27m

$73

Sacramento IntlOntario

SMF - ONT

SMFONT

Sacramento Intl

Fri 8/9

Nonstop1h 21m

Ontario

Tue 8/13

Nonstop1h 23m

$73

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 6/6

Nonstop1h 23m

Ontario

Fri 6/14

Nonstop1h 28m

$74

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 6/18

Nonstop1h 20m

Ontario

Thu 6/20

Nonstop1h 10m

$185

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 6/11

2 stops15h 58m

Ontario

Sun 6/16

Nonstop1h 27m

$197

RenoOntario

RNO - ONT

RNOONT

Reno

Tue 6/4

1 stop6h 13m

Ontario

Tue 6/11

1 stop6h 26m

$208

Flights are sorted by cheapest first

Deals found on 5/4

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Ontario

To help decide which airline to fly from California to Ontario, see what other customers have to say about Frontier, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.2

Very good

6,092 reviews

Check prices

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Southwest

8.2

Very good

6,092 reviews

Southwest

8.2

Very good

6,092 reviews

Check prices

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Alaska Airlines

8.1

Very good

9,134 reviews

Southwest

8.2

Very good

6,092 reviews

Check prices

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Delta

8.1

Very good

10,826 reviews

Southwest

8.2

Very good

6,092 reviews

Check prices

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Hawaiian Airlines

8.0

Very good

2,322 reviews

Southwest

8.2

Very good

6,092 reviews

Check prices

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

WestJet

7.6

Good

2,966 reviews

Southwest

8.2

Very good

6,092 reviews

Check prices

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Related info for your journey

What airport do you fly into for flights to Ontario from California?
Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from California.
Can I find flights from California to Ontario for under $100 on Cheapflights?
Yes, there are multiple flights from California to Ontario for under $100. The cheapest flight booked recently is on Frontier for just $70, but on average you can expect to pay $77.
Are there nonstop flights from California to Ontario for under $100 on Cheapflights?
Cheapflights has at least 20 direct flights from California to Ontario under $100. A good price for a nonstop flight from California to Ontario is less than $49.
Are there last-minute flights available from California to Ontario for under $100?
There are currently 20+ open flights from California to Ontario within the next 7 days for less than $100.
What are the cheapest airlines to fly from California to Ontario one-way?
For one-way options, check prices for Frontier. According to our data, you can fly for as low as $48. Users have also found prices from $95 and $104 on Delta and American Airlines, respectively.
What are the most popular routes from California to Ontario?
When deciding which route to take from California to Ontario consider San Francisco - Ontario, San Jose - Ontario or Sacramento Intl - Ontario as they are the most popular.
What does LAX to ONT mean?
Los Angeles Airport is LAX and Ontario Airport is ONT. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service. San Francisco Airport (SFO), San Diego Airport (SAN), Santa Ana J. Wayne/Orange Cnty Airport (SNA), San Jose Airport (SJC), Sacramento Intl Airport (SMF) are some additional IATA codes for airports related to your trip.
Can I find deals for flights from California to Ontario that include extra baggage allowance?
The amount of baggage you can bring on your California to Ontario flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.
Can I find deals on flights from California to Ontario with specific airlines?
Yes, Cheapflights allows you to browse and filter California to Ontario flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.
Can I find deals for flights from California to Ontario that include hotel bookings?
Yes. In addition to deals on California to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from California to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to Ontario.
Can I find deals for business class flights from California to Ontario?
Yes. Cheapflights offers flight deals from California to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
Can I find deals for flights from California to Ontario that allow pets onboard?
Many airlines flying from California to Ontario offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.
Can I find deals on last-minute flights from California to Ontario?
Yes, you can often find last-minute deals on California to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.
How recently were the California to Ontario flight deals updated?
The California to Ontario flight deals you see on this page were last updated on 5/5.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for California to Ontario
See prices for flight routes from nearby airports that may be better suited for you.

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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.

Ontario car rentals

Los Angeles Airport car rentals

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Burbank Bob Hope Airport car rentals

Long Beach Municipal Airport car rentals

Los Angeles car rentals

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Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 5, 2024.

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California to Ontario flights
Consider these flights traveling from California to Ontario.

San Jose to Ontario flights

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Santa Rosa to Ontario flights

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Los Angeles to Ontario flights

Top 8 airlines flying from California to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$34	Average$117	FlexibilityNo cancel fee	On-time65%	Search Spirit Airlines flights
Frontier	Cheapest$38	Average$113	FlexibilityNo cancel fee	On-time62%	Search Frontier flights
JetBlue	Cheapest$45	Average$108	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
Delta	Cheapest$45	Average$192	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Alaska Airlines	Cheapest$54	Average$299	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights
Breeze Airways	Cheapest$59	Average$124	FlexibilityNo cancel fee	On-timeN/A	Search Breeze Airways flights
United Airlines	Cheapest$100	Average$339	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
American Airlines	Cheapest$179	Average$421	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

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Search flights from California to Ontario by cabin class

Hourly flight availability from California to Ontario

14%of flight departures	Early morningMidnight to 6 am
31%of flight departures	Morning6 am to noon
27%of flight departures	AfternoonNoon to 6 pm
28%of flight departures	Evening6 pm to midnight

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Fly with Cheapflights

How does Cheapflights help users find flights from California to Ontario?

When you search for this flight from California to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from California to Ontario?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ontario from California.

Can Cheapflights find flights from California to Ontario with no change fees?

Certainly. Search results for flights to Ontario from California shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from California to Ontario become cheaper?

Yes! Start tracking prices for California to Ontario flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from California to Ontario (ONT) from $38

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/22. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.

When is the cheapest time to fly from California to Ontario (CA - ONT)?

Cheap Frontier flights from California to Ontario

Consider these cheap Frontier flights we've found departing from California to Ontario. Be sure to come back soon if the deals available don't appeal to you at this time.

Cheap Southwest flights from California to Ontario

To aid your search, here are some of the cheapest Southwest flights we've found from California to Ontario. Ensure the flight price, dates, time, and airline match your criteria before you book.

Cheap California to Ontario flights in May & June 2024

Find cheap flight options from California to Ontario specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,719,943 searches. Prices were last updated on May 5, 2024.

These are some of the most attractive deals on flights from California to Ontario in 2024. If these deals don't appeal to you, be sure to come back soon for more options.

California to Ontario 2024 flight deals

Discover exclusive flight deals for travel between California and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,719,943 searches. Data last updated May 5, 2024.

These are some of the most attractive deals on flights from California to Ontario in 2024. If these deals don't appeal to you, be sure to come back soon for more options.

Non-stop flights to Ontario from California

To help reduce your travel time, choose from one of these non-stop flights from California to Ontario. Those looking to potentially save on 1 or 2-stop flights from California to Ontario should utilize the search form at the the top of the page.

California to Ontario flights leaving soon

Consider one of these great deals we found on last-minute flights from California to Ontario. Users should be sure to double check the price, date, and time of their last-minute flight.

One-way flights to Ontario from California

Take a look at some of the best available options we've come across on one-way flights from California to Ontario. Users needing a return flight from California to Ontario should utilize the search form above.

Find flights from California to Ontario within your budget

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated May 5, 2024.

To help decide which airline to fly from California to Ontario, see what other customers have to say about Frontier, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from California to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to Ontario from California?

Can I find flights from California to Ontario for under $100 on Cheapflights?

Are there nonstop flights from California to Ontario for under $100 on Cheapflights?

Are there last-minute flights available from California to Ontario for under $100?

What are the cheapest airlines to fly from California to Ontario one-way?

What are the most popular routes from California to Ontario?

What does LAX to ONT mean?

Can I find deals for flights from California to Ontario that include extra baggage allowance?

Can I find deals on flights from California to Ontario with specific airlines?

Can I find deals for flights from California to Ontario that include hotel bookings?

How can I find direct flights from California to Ontario?

Can I find deals for business class flights from California to Ontario?

Can I find deals for flights from California to Ontario that allow pets onboard?

Can I find deals on last-minute flights from California to Ontario?

How recently were the California to Ontario flight deals updated?

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Alternative routes for California to OntarioSee prices for flight routes from nearby airports that may be better suited for you.

See prices for flight routes from nearby airports that may be better suited for you.

Top 8 airlines flying from California to Ontario

Popular flight searches

Check out other popular destinations found by fellow travelers in 2024

Search flights from California to Ontario by cabin class

Find flights from California to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Hourly flight availability from California to Ontario

Find hourly flight availability from California to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 5, 2024.

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How does Cheapflights help users find flights from California to Ontario?

Why should you use Cheapflights to find cheap flight tickets from California to Ontario?

Can Cheapflights find flights from California to Ontario with no change fees?

Can Cheapflights notify me if prices for flights from California to Ontario become cheaper?

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Alternative routes for California to Ontario
See prices for flight routes from nearby airports that may be better suited for you.