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$39+ Cheap flights from San Jose 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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheapflights Tip: The best prices from San Jose to Ontario are usually found in August or January, booked 85 days in advance, depart on a Tuesday or Thursday and return on a Saturday

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 July 28, 2025.

Round-trip from

$97
(Southwest)

One-way from

$39
(Southwest)

Popular in

November

Cheapest in

August

Average price

$247

Good round-trip deal

$124 or less

Good one-way deal

$139 or less
From San Jose to Ontario
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One-way flight from San Jose to Ontario
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Highest demand for flights based on searches. 8% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 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 San Jose to Ontario.
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Price to beat on a one-way flight from San Jose to Ontario.
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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 July 28, 2025.

This Southwest deal was found by Cheapflights users on 7/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/208:05 amSJC - ONT
Nonstop1h 15mSouthwest
Sat 8/238:15 amONT - SJC
Nonstop1h 15mSouthwest
Deal found 7/26$97
This FlightHub deal was found by Cheapflights users on 7/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/42:12 pmSJC - ONT
1 stop6h 40mFrontier
Wed 8/65:21 pmONT - SJC
1 stop18h 01mFrontier
Deal found 7/26$175
This American Airlines deal was found by Cheapflights users on 7/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/236:00 amSJC - ONT
1 stop10h 24mAmerican Airlines
Mon 8/254:54 pmONT - SJC
1 stop5h 31mAmerican Airlines
Deal found 7/27$251
This Alaska Airlines deal was found by Cheapflights users on 7/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/99:30 amSJC - ONT
1 stop7h 30mAlaska Airlines
Tue 9/1610:06 amONT - SJC
1 stop12h 53mAlaska Airlines
Deal found 7/26$302

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 July 28, 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 8/20

8:05 am-9:20 am

Nonstop1h 15m

Ontario

Sat 8/23

8:15 am-9:30 am

Nonstop1h 15m

$97

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sun 8/10

7:00 pm-11:53 am

1 stop16h 53m

Ontario

Wed 8/13

5:21 pm-11:22 am

1 stop18h 01m

$175

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 8/23

9:49 am-5:52 pm

1 stop8h 03m

Ontario

Sun 8/24

12:22 pm-6:27 pm

1 stop6h 05m

$251

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 9/9

9:30 am-5:00 pm

1 stop7h 30m

Ontario

Tue 9/16

10:06 am-10:59 pm

1 stop12h 53m

$302

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 8/21

6:30 am-7:55 am

Nonstop1h 25m

$39

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sun 9/7

2:04 pm-7:59 pm

1 stop5h 55m

$87

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 10/28

3:15 pm-9:29 am

1 stop18h 14m

$116

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 9/10

8:00 am-6:47 pm

2 stops10h 47m

$127

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/25

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

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 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 July 25, 2025.

To ensure you get the cheapest price possible for a flight from San Jose to Ontario, you should look to book at least 84 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 San Jose to Ontario?

Currently, August is the cheapest month in which you can book a flight from San Jose to Ontario (average of $246). Flying from San Jose to Ontario in March is currently the most expensive (average of $328). 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 July 28, 2025.

It’s optimal to fly from San Jose to Ontario at noon. By choosing this option you can save up to 25% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from San Jose 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 July 20, 2025.

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

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 July 28, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and American Airlines 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
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

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

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

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
4,237 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

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

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

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
3,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.1

Comfort

7.8

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 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 2 outbound flights from San Jose to Ontario offered by 4 different airlines.

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

    Within the past month, 1 users have taken a look at flights from San Jose to Ontario.

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

    According to our current data, Southwest ($97), Frontier ($175), and American Airlines ($251) offers the cheapest pricing from San Jose to Ontario. Southwest is 60% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $39. However, be on the lookout for offers from Frontier and American Airlines, as they are both options that can get you from San Jose to Ontario for a low price.

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

    Looking at all options, your cheapest flight can be booked for $75. While the most popular route (San Jose - Ontario) can be booked for $97 on average our data indicates $214 when flying from San Jose 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 to Ontario?

    Currently, August is the cheapest month in which you can book a flight from San Jose to Ontario (average of $246). Flying from San Jose to Ontario in March is currently the most expensive (average of $328). 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 4 airlines flying from San Jose to Ontario

Discover the top 4 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 July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$24Average$66FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$106FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$145Average$272FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$196Average$296FlexibilityNo cancel feeOn-time75%

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