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Ontario

$72+ Cheap flights from San Jose, CA to Ontario (SJC - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/8. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
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Cheapflights Tip: The best prices from San Jose to Ontario are usually found in January or August, booked 27 days in advance, depart on a Monday or Thursday and return on a Tuesday

Find flight deals from San Jose to Ontario

Cheapest flights from San Jose to Ontario
Explore the most affordable flight options available from San Jose to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 26, 2025.

This Southwest deal was found by Cheapflights users on 11/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:05 amSJC - ONT
Nonstop1h 15mSouthwest
Thu 1/13:15 pmONT - SJC
Nonstop1h 15mSouthwest
Deal found 11/25$181
This CheapOair deal was found by Cheapflights users on 11/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/183:27 pmSJC - ONT
1 stop5h 50mFrontier
Wed 12/246:00 pmONT - SJC
1 stop24h 48mFrontier
Deal found 11/26$214
This Southwest deal was found by Cheapflights users on 11/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:05 amSJC - ONT
Nonstop1h 15mSouthwest
Sat 1/36:20 amONT - SJC
Nonstop1h 15mSouthwest
Deal found 11/24$244
This Southwest deal was found by Cheapflights users on 11/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:35 amSJC - ONT
Nonstop1h 20mSouthwest
Tue 12/236:30 amONT - SJC
Nonstop1h 15mSouthwest
Deal found 11/25$246
This Southwest deal was found by Cheapflights users on 11/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:05 amSJC - ONT
Nonstop1h 15mSouthwest
Fri 1/29:10 pmONT - SJC
1 stop10h 25mSouthwest
Deal found 11/25$250
This Southwest deal was found by Cheapflights users on 11/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1512:10 pmSJC - ONT
1 stop3h 10mSouthwest
Mon 1/54:00 pmONT - SJC
Nonstop1h 15mSouthwest
Deal found 11/25$282
This Alaska Airlines deal was found by Cheapflights users on 11/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:18 amSJC - ONT
1 stop12h 15mAlaska Airlines
Wed 12/176:00 amONT - SJC
1 stop14h 00mAlaska Airlines
Deal found 11/25$283
This Southwest deal was found by Cheapflights users on 11/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:30 amSJC - ONT
2 stops8h 20mSouthwest
Wed 12/313:15 pmONT - SJC
Nonstop1h 15mSouthwest
Deal found 11/25$284

Cheap flight deals from San Jose to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from San Jose (SJC) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$181
(Southwest)

One-way from

$72
(Kiwi.com)

Popular in

November

Cheapest in

January

Average price

$339

Good round-trip deal

$279 or less

Good one-way deal

$149 or less
Provider with most accurate pricing for San Jose-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Jose-Ontario flights.
Search Deals
From San Jose to Ontario
Search Deals
One-way flight from San Jose to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from San Jose to Ontario.
Search Deals
Price to beat on a one-way flight from San Jose to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Jose to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 26, 2025.
Use the filters below to find and compare flights from San Jose to Ontario that are best for you.

Fly from

San Jose

Fly to

Ontario

Route

Depart

Return

Price

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 1/13

7:45 am-4:12 pm

2 stops8h 27m

Ontario

Sat 1/17

7:30 am-5:40 pm

1 stop10h 10m

$230

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 1/22

11:00 am-11:56 pm

1 stop12h 56m

Ontario

Tue 1/27

4:03 pm-9:48 am

1 stop17h 45m

$264

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 1/9

6:02 pm-11:56 pm

1 stop5h 54m

Ontario

Tue 1/13

5:59 pm-1:00 pm

2 stops19h 01m

$269

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 1/31

11:00 am-8:36 pm

1 stop9h 36m

Ontario

Mon 2/2

5:59 pm-9:48 am

2 stops15h 49m

$270

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 1/20

9:53 am-8:36 pm

2 stops10h 43m

Ontario

Wed 2/18

7:00 am-5:09 pm

2 stops10h 09m

$278

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 1/23

6:15 am-11:56 pm

1 stop17h 41m

Ontario

Sun 1/25

6:00 am-5:08 pm

1 stop11h 08m

$279

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 12/19

6:40 am-12:50 pm

1 stop6h 10m

Ontario

Tue 12/23

6:30 am-7:45 am

Nonstop1h 15m

$280

San JoseOntario

SJC - ONT

SJCONT

San Jose

Mon 12/15

12:10 pm-3:20 pm

1 stop3h 10m

Ontario

Mon 1/5

4:00 pm-5:15 pm

Nonstop1h 15m

$282

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 1/20

9:05 am-3:08 pm

1 stop6h 03m

Ontario

Tue 2/17

6:14 am-1:42 pm

1 stop7h 28m

$283

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 1/21

11:00 am-8:36 pm

1 stop9h 36m

Ontario

Wed 2/18

6:14 am-1:42 pm

1 stop7h 28m

$283

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/25

Showing 1-10 of 20 results
1
2

Compare providers for flights from San Jose to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Jose to Ontario in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Jose, California-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Jose, California-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Jose, California-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Jose, California-Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Jose, California-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Jose to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from San Jose with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Jose to Ontario

How far ahead should I book a flight from San Jose, California to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from San Jose to Ontario. Price data was last updated on November 21, 2025.

The price you pay for your flight from San Jose, California to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 27 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from San Jose, California to Ontario?

Currently, February is the cheapest month in which you can book a flight from San Jose, California to Ontario (average of $19). Flying from San Jose, California to Ontario in September is currently the most expensive (average of $60). 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.

What is the cheapest time of day to fly from SJC to ONT?

Find hourly flight availability from San Jose 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 November 26, 2025.

It’s optimal to fly from San Jose, California to Ontario at noon. By choosing this option you can save up to 7% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from San Jose, California to Ontario?

Use this chart to determine the cheapest time to fly round-trip from San Jose to Ontario. Price data was last updated on November 25, 2025.

Travelers seeking maximum savings on their San Jose, California to Ontario flight should consider departing on Monday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for San Jose to Ontario flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your San Jose to Ontario trip
Airports
SJC

SJC offers free Wi-Fi throughout the airport, making it easy to stay connected while waiting for your flight.

Read more about SJCby Daniel Scheffler
ONT

Consider renting a car at ONT for quick access to I-10, ideal for exploring Southern California.

Read more about ONTby Bill Fink
Our travel experts
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Daniel Scheffler

Daniel Scheffler

Expert on SJC

Daniel Scheffler

Daniel Scheffler

Daniel Scheffler is a travel writer, podcaster, and producer. Born in Africa, bred in Europe and now living in America he has traveled to 140 countries (and all 50 U.S. states). Plus he has stayed at over 2500 hotels across the globe. His original shows Everywhere and Without Maps (available on Spotify) showcase his beliefs, travel is about humanity and sharing that beauty. And thus it reminds you that you shouldn’t believe everything you think.

Read more

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 November 26, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Frontier from San Jose to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,363 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,254 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,101 reviews
Alaska Airlines
8.0
Very good
11,363 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

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

  • What airports do I use to fly from San Jose to Ontario?

    To fly from San Jose to Ontario, you need to book a flight from San Jose (SJC) to Ontario (ONT). Nonstop flights to Ontario from San Jose take 1h 15m on average. When it comes time to book airfare, you have a few options: there are 3 outbound flights from San Jose to Ontario offered by 3 different airlines.

  • How popular is this San Jose, California to Ontario flight route?

    The San Jose to Ontario flight path was viewed by 5 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from San Jose, California to Ontario?

    A quick flight from San Jose, California to Ontario can take about 8h 27m. Delta provides one of the quickest options available for as low as $230. The distance from San Jose, California to Ontario is about 333 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from San Jose, California to Ontario round-trip?

    Cheapflights users have booked flights from San Jose, California to Ontario round-trip from $62. Other airlines that can offer you cheap pricing are Southwest, from $113, and Alaska Airlines, from $196. Users have found that Frontier is 76% cheaper than the other options available to this destination.

  • What are the cheapest flights from San Jose, California to Ontario?

    Looking at all options, your cheapest flight can be booked for $96. While the most popular route (San Jose - Ontario) can be booked for $195 on average, our data indicates $284 when flying from San Jose, California to Ontario.

  • Can I find deals for flights from San Jose to Ontario that include hotel bookings?

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

  • How can I find direct flights from San Jose to Ontario?

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

  • Can I find deals for business class flights from San Jose to Ontario?

    Yes. Cheapflights offers flight deals from San Jose 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.

  • What is the cheapest month to book a flight from San Jose, California to Ontario?

    Currently, February is the cheapest month in which you can book a flight from San Jose, California to Ontario (average of $19). Flying from San Jose, California to Ontario in September is currently the most expensive (average of $60). 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.

See more FAQs

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Top 3 airlines flying from San Jose to Ontario

Discover the top 3 airlines that operate flights from San Jose to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$62Average$180FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$113Average$274FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$196Average$262FlexibilityNo cancel feeOn-time75%

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