HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$55+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Jose to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from San Jose to Ontario are usually found in January or August, booked 62 days in advance, depart on a Monday or Thursday and return on a Saturday

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 3, 2025.

This CheapOair deal was found by Cheapflights users on 11/1. 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.
Mon 11/176:19 pmSJC - ONT
1 stop3h 38mFrontier
Thu 11/203:31 pmONT - SJC
1 stop26h 03mFrontier
Deal found 11/1$110
This Southwest deal was found by Cheapflights users on 11/3. 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 12/107:05 amSJC - ONT
Nonstop1h 15mSouthwest
Wed 12/103:15 pmONT - SJC
Nonstop1h 15mSouthwest
Deal found 11/3$169
This CheapOair deal was found by Cheapflights users on 11/3. 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.
Mon 11/1012:27 pmSJC - ONT
1 stop11h 23mFrontier
Thu 11/1312:05 pmONT - SJC
1 stop23h 27mFrontier
Deal found 11/3$190
This Southwest deal was found by Cheapflights users on 11/1. 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.
Thu 12/47:05 amSJC - ONT
Nonstop1h 15mSouthwest
Sun 12/710:35 amONT - SJC
Nonstop1h 15mSouthwest
Deal found 11/1$236
This lastminute.com deal was found by Cheapflights users on 11/3. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/57:50 pmSJC - ONT
1 stop15h 29mHawaiian Airlines
Sun 12/76:00 amONT - SJC
1 stop7h 50mHawaiian Airlines
Deal found 11/3$237
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/253:27 pmSJC - ONT
1 stop5h 50mFrontier
Wed 12/316:45 amONT - SJC
2 stops31h 47mFrontier
Deal found 11/2$255

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 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$110
(CheapOair)

One-way from

$55
(CheapOair)

Popular in

November

Cheapest in

January

Average price

$309

Good round-trip deal

$218 or less

Good one-way deal

$139 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. 10% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 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 3, 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

Wed 12/10

7:00 am-12:10 pm

1 stop5h 10m

Ontario

Wed 12/10

3:10 pm-7:40 pm

1 stop4h 30m

$189

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 1/16

8:55 pm-10:10 pm

Nonstop1h 15m

Ontario

Mon 1/19

6:40 am-7:55 am

Nonstop1h 15m

$236

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 3/19

8:00 pm-9:15 pm

Nonstop1h 15m

Ontario

Tue 3/24

2:15 pm-5:35 pm

1 stop3h 20m

$279

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 12/12

8:00 am-9:15 am

Nonstop1h 15m

Ontario

Fri 12/12

2:20 pm-9:10 pm

1 stop6h 50m

$279

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 12/24

1:00 pm-6:15 pm

2 stops5h 15m

Ontario

Wed 12/31

8:30 am-3:35 pm

1 stop7h 05m

$284

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 12/5

6:35 am-12:00 pm

1 stop5h 25m

Ontario

Sun 12/7

5:25 am-10:35 am

2 stops5h 10m

$284

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 3/12

8:00 pm-9:15 pm

Nonstop1h 15m

Ontario

Sun 3/15

6:15 am-7:35 am

Nonstop1h 20m

$299

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 1/6

8:20 am-9:35 am

Nonstop1h 15m

$85

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 2/25

8:05 am-12:25 pm

1 stop4h 20m

$95

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 1/27

4:10 pm-8:45 pm

1 stop4h 35m

$95

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/1

Showing 1-10 of 17 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 October 31, 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 54 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 3, 2025.

It’s optimal to fly from San Jose, California to Ontario at noon. By choosing this option you can save up to 5% 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 2, 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 3, 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
11,235 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Food

7.1

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
11,235 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Food

7.1

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
4,238 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Food

7.1

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
3,117 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Food

7.1

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 4 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 5h 10m. Southwest provides one of the quickest options available for as low as $189. The distance from San Jose, California to Ontario is about 333 mi.

  • 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 $114, 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 $85. While the most popular route (San Jose - Ontario) can be booked for $236 on average, our data indicates $248 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Jose to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Los Angeles flights
Los Angeles to San Francisco flights
San Francisco to Ontario flights
San Francisco to Las Vegas flights
Ontario to San Francisco flights
San Francisco to Santa Ana flights
Los Angeles to Las Vegas flights
Burbank to Las Vegas flights
San Jose to Los Angeles flights
Santa Ana to San Francisco flights
San Jose to Las Vegas flights
Santa Ana to Las Vegas flights
Los Angeles to San Jose flights
Sacramento to Los Angeles flights
San Francisco to San Diego flights
Ontario to Las Vegas flights
San Diego to San Francisco flights
Sacramento to Las Vegas flights
San Diego to Las Vegas flights
Oakland to Las Vegas flights
San Francisco to Burbank flights
Los Angeles to Sacramento flights
Burbank to San Francisco flights
San Francisco to Palm Springs flights
Las Vegas to Los Angeles flights
Fresno to Las Vegas flights
Reno to Las Vegas flights
Ontario to Sacramento flights
Sacramento to Ontario flights
Las Vegas to Burbank flights
Las Vegas to San Francisco flights
Ontario to San Jose flights
Las Vegas to San Diego flights
Los Angeles to Reno flights
San Diego to San Jose flights
Sacramento to San Diego flights
San Jose to Santa Ana flights
San Jose to San Diego flights
Palm Springs to San Francisco flights
Santa Ana to San Jose flights
Oakland to Los Angeles flights
Santa Ana to Sacramento flights
Stockton to Las Vegas flights
Las Vegas to Santa Ana flights
Sacramento to Santa Ana flights
Reno to Los Angeles flights
San Francisco to Long Beach flights
Long Beach to San Francisco flights
San Jose to Palm Springs flights

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 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$62Average$165FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$116Average$281FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$196Average$262FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.