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San Jose

$69+ Cheap flights from Ontario to San Jose, CA (ONT - SJC)

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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJC
Feb 19 — Feb 261
Thu 2/19
Thu 2/26
1 adult, Economy
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Find cheap flights from Ontario to San Jose 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

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Cheapflights Tip: The best prices from Ontario to San Jose are usually found in May or April, booked 76 days in advance, depart on a Tuesday or Saturday and return on a Monday

Cheap flight deals from Ontario to San Jose

Cheapest flights from Ontario to San Jose
Explore the most affordable flight options available from Ontario to San Jose. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 20, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
Wed 3/47:17 pm
ONT
-
SJC
1 stop22h 27m
Frontier
Mon 3/98:20 pm
SJC
-
ONT
1 stop19h 34m
Frontier
Deal found 1/19$133
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 3/57:22 pm
ONT
-
SJC
1 stop22h 45m
Frontier
Sun 3/88:20 pm
SJC
-
ONT
1 stop11h 46m
Frontier
Deal found 1/19$145
This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
Wed 2/117:17 pm
ONT
-
SJC
1 stop22h 37m
Frontier
Mon 2/169:35 am
SJC
-
ONT
1 stop8h 13m
Frontier
Deal found 1/19$147
This CheapOair deal was found by Cheapflights users on 1/18. 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 4/910:50 am
ONT
-
SJC
1 stop8h 12m
Frontier
Mon 4/1310:29 am
SJC
-
ONT
1 stop9h 38m
Frontier
Deal found 1/18$161
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Fri 3/610:57 am
ONT
-
SJC
1 stop7h 10m
Frontier
Sun 3/88:20 pm
SJC
-
ONT
1 stop11h 46m
Frontier
Deal found 1/20$165
This Booking.com deal was found by Cheapflights users on 1/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/313:04 pm
ONT
-
SJC
1 stop18h 06m
Frontier
Mon 2/210:37 am
SJC
-
ONT
1 stop4h 04m
Frontier
Deal found 1/18$167
This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
Tue 2/103:22 pm
ONT
-
SJC
2 stops42h 17m
Multiple Airlines
Mon 2/169:35 am
SJC
-
ONT
1 stop8h 13m
Multiple Airlines
Deal found 1/19$176
This CheapOair deal was found by Cheapflights users on 1/19. 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.
Wed 2/117:17 pm
ONT
-
SJC
1 stop22h 37m
Frontier
Sun 2/228:57 pm
SJC
-
ONT
1 stop20h 51m
Frontier
Deal found 1/19$180
This Frontier deal was found by Cheapflights users on 1/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2911:04 am
ONT
-
SJC
1 stop4h 07m
Frontier
Mon 2/210:37 am
SJC
-
ONT
1 stop8h 33m
Frontier
Deal found 1/18$181
This Southwest deal was found by Cheapflights users on 1/20. 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 4/2210:55 am
ONT
-
SJC
1 stop4h 25m
Southwest
Wed 4/226:10 pm
SJC
-
ONT
1 stop4h 00m
Southwest
Deal found 1/20$189
This CheapOair deal was found by Cheapflights users on 1/18. 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 2/123:24 pm
ONT
-
SJC
1 stop16h 31m
Frontier
Mon 2/169:35 am
SJC
-
ONT
1 stop8h 13m
Frontier
Deal found 1/18$190

Find flight deals from Ontario to San Jose

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Jose (SJC). 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 January 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$133
(Kiwi.com)

One-way from

$69
(Kiwi.com)

Popular in

January

Cheapest in

May

Average price

$409

Good round-trip deal

$284 or less

Good one-way deal

$189 or less
Provider with most accurate pricing for Ontario-San Jose flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-San Jose flights.
Search Deals
From Ontario to San Jose
Search Deals
One-way flight from Ontario to San Jose
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($70 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Ontario to San Jose.
Search Deals
Price to beat on a one-way flight from Ontario to San Jose.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to San Jose 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 January 20, 2026.
Use the filters below to find and compare flights from Ontario to San Jose that are best for you.

Fly from

Ontario

Fly to

San Jose

Route

Depart

Return

Price

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 4/22

10:55 am-3:20 pm

1 stop4h 25m

San Jose

Wed 4/22

6:10 pm-10:10 pm

1 stop4h 00m

$189

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 2/11

3:15 pm-9:15 pm

1 stop6h 00m

San Jose

Mon 2/16

7:00 am-8:15 am

Nonstop1h 15m

$202

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 3/4

12:10 pm-1:30 pm

Nonstop1h 20m

San Jose

Sat 3/7

6:30 am-7:50 am

Nonstop1h 20m

$215

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 2/10

12:10 pm-1:30 pm

Nonstop1h 20m

San Jose

Mon 2/16

7:00 am-8:15 am

Nonstop1h 15m

$215

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sun 3/29

6:10 am-7:30 am

Nonstop1h 20m

San Jose

Tue 3/31

3:50 pm-10:35 pm

2 stops6h 45m

$240

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 3/21

5:15 am-10:00 am

1 stop4h 45m

San Jose

Tue 3/31

7:50 pm-9:05 pm

Nonstop1h 15m

$247

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 2/9

4:40 pm-6:00 pm

Nonstop1h 20m

San Jose

Fri 2/27

8:45 pm-10:00 pm

Nonstop1h 15m

$247

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 3/19

5:25 pm-11:30 pm

1 stop6h 05m

San Jose

Tue 3/31

7:50 pm-9:05 pm

Nonstop1h 15m

$247

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 2/21

8:00 am-9:15 am

Nonstop1h 15m

San Jose

Sat 2/21

11:40 am-12:55 pm

Nonstop1h 15m

$247

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 2/23

9:55 am-4:20 pm

2 stops6h 25m

San Jose

Mon 2/23

8:55 pm-10:10 pm

Nonstop1h 15m

$253

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/18

Showing 1-10 of 22 results
1
2
3

Compare providers for flights from Ontario to San Jose

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 Ontario to San Jose in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
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 Ontario-San Jose, California flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Jose, California flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-San Jose, California flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-San Jose, California flights, Cheapflights users trust Expedia the most. Expedia 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 Ontario-San Jose, California 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 Ontario to San Jose

Have a flexible travel schedule? Discover the best time to fly to San Jose from Ontario 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 Ontario to San Jose

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to San Jose. Price data was last updated on January 16, 2026.

To ensure you get the cheapest price possible for a flight from Ontario to San Jose, California, you should look to book at least 76 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, February is the cheapest month in which you can book a flight from Ontario to San Jose, California (average of $19). Flying from Ontario to San Jose, California in November is currently the most expensive (average of $62). 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 ONT to SJC?

Find hourly flight availability from Ontario to San Jose. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 20, 2026.

It’s optimal to fly from Ontario to San Jose, California at noon. By choosing this option you can save up to 33% on the cost of your flight, compared to a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Jose. Price data was last updated on January 17, 2026.

Travelers seeking maximum savings on their Ontario to San Jose, California flight should consider departing on Wednesday at noon 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 Ontario to San Jose flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to San Jose trip
Our travel experts
Bill Fink

Bill Fink

Expert on ONT

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 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 San Jose

Get insights into the airlines that provide service to San Jose. 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 San Jose. Reviews last updated January 20, 2026.
Peruse reviews from past customers who have flown with Southwest, United Airlines, and Frontier from Ontario to San Jose to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,266 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,189 reviews
Southwest
8.0
Very good
4,266 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,266 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Jose. 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 Ontario to San Jose?

    San Jose is the airport most travelers will use when flying to San Jose from Ontario. Booking flights from Ontario (ONT) to San Jose (SJC) should be relatively easy as there are 3 daily flights to San Jose from 3 different airlines. 1h 10m is how long a flight from Ontario to San Jose will take if you book a nonstop flight.

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

    Within the past month, 26 users have taken a look at flights from Ontario to San Jose.

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

    Southwest can get you from Ontario to San Jose, California in just under 4h 25m. Your travel time can differ by up to . Ontario and San Jose, California are separated by a distance of 333 mi.

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

    Frontier, at $29, was found to be the cheapest airline from Ontario to San Jose, California.Alternate airlines to your destination round-trip include United Airlines and Southwest. Users have found that Frontier is 88% cheaper than the other options available to this destination.

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

    Looking for the cheapest flight from Ontario to San Jose, California? While on average our users pay $320, our data indicates the cheapest price to be $83. The most popular route (Ontario - San Jose), is priced around $161.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to San Jose 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 Ontario to San Jose, California?

    Currently, February is the cheapest month in which you can book a flight from Ontario to San Jose, California (average of $19). Flying from Ontario to San Jose, California in November is currently the most expensive (average of $62). 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 Ontario to San Jose

Discover the top 3 airlines that operate flights from Ontario to San Jose. 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 January 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$29Average$114FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$89Average$187FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$97Average$260FlexibilityNo cancel feeOn-time63%

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