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San Jose

$49+ Cheap flights from Ontario to San Jose (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 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJC
Jul 19 — Jul 261
Sat 7/19
Sat 7/26
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to San Jose are usually found in September or May, booked 76 days in advance, depart on a Saturday or Friday and return on a Tuesday

Cheap 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 July 14, 2025.

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

January

Cheapest in

September

Average price

$259

Good round-trip deal

$247 or less

Good one-way deal

$139 or less
From Ontario to San Jose
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One-way flight from Ontario to San Jose
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Highest demand for flights based on searches. 11% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Ontario to San Jose.
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Price to beat on a one-way flight from Ontario to San Jose.
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Find 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 July 14, 2025.

This Southwest deal was found by Cheapflights users on 7/11. 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 8/77:55 pmONT - SJC
Nonstop1h 10mSouthwest
Mon 8/117:10 pmSJC - ONT
Nonstop1h 15mSouthwest
Deal found 7/11$97
This Frontier deal was found by Cheapflights users on 7/11. 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.
Fri 8/16:00 amONT - SJC
1 stop7h 17mFrontier
Mon 8/42:12 pmSJC - ONT
1 stop6h 40mFrontier
Deal found 7/11$132

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 July 14, 2025.
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

Thu 8/7

7:55 pm-9:05 pm

Nonstop1h 10m

San Jose

Mon 8/11

7:10 pm-8:25 pm

Nonstop1h 15m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Fri 8/1

6:00 am-1:17 pm

1 stop7h 17m

San Jose

Mon 8/4

2:12 pm-8:52 pm

1 stop6h 40m

$132

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 9/27

3:45 pm-5:00 pm

Nonstop1h 15m

$49

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Fri 8/1

6:00 am-1:17 pm

1 stop7h 17m

$72

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 11/24

5:01 pm-10:21 pm

1 stop5h 20m

$128

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 8/26

10:06 am-5:36 pm

2 stops7h 30m

$147

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 11/27

6:00 am-4:44 pm

1 stop10h 44m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/14

The best insider tips for Ontario to San Jose 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 Ontario to San Jose trip
Airports
ONT

ONT offers smooth security with quicker lines than LAX, making it ideal for weekday business travelers.

Read more about ONTby Bill Fink
SJC

For quick city access, use rideshare services at SJC, with designated pick-up locations at all terminals.

Read more about SJCby Daniel Scheffler
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

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?

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 July 11, 2025.

Booking 76 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to San Jose. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, September is the cheapest month in which you can book a flight from Ontario to San Jose (average of $255). Flying from Ontario to San Jose in June is currently the most expensive (average of $359). 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 July 14, 2025.

It’s optimal to fly from Ontario to San Jose in the evening. By choosing this option you can save up to 13% 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?

Use this chart to determine the cheapest time to fly round-trip from Ontario to San Jose. Price data was last updated on July 13, 2025.

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

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 July 14, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and American Airlines 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Frontier
5.9
Fair
3,261 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 2 daily flights to San Jose from 5 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 flight route?

    The Ontario to San Jose flight path was viewed by 23 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Currently priced at $97, Southwest will fly you from Ontario to San Jose and back. In addition to Southwest, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Frontier for as low as $132. Southwest is currently priced 58% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Ontario to San Jose one-way?

    One-way options have recently been found by users for as low as $49 on Southwest. Other airlines that offer cheap prices include Frontier from $72 and American Airlines from $128 one-way.

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

    Looking for the cheapest flight from Ontario to San Jose? While on average our users pay $229, our data indicates the cheapest price to be $99. The most popular route (Ontario - San Jose), is priced around $117.

  • 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?

    Currently, September is the cheapest month in which you can book a flight from Ontario to San Jose (average of $255). Flying from Ontario to San Jose in June is currently the most expensive (average of $359). 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.

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Top 5 airlines flying from Ontario to San Jose

Discover the top 5 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 July 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$34Average$110FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$40Average$74FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$89Average$187FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$113Average$259FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$225Average$370FlexibilityNo cancel feeOn-time75%

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