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San Jose

$86+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJC
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to San Jose are usually found in August or July, booked 6 days in advance, depart on a Saturday or Tuesday 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 April 29, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$170
(Frontier)

One-way from

$86
(Frontier)

Popular in

January

Cheapest in

August

Average price

$193

Good round-trip deal

$178 or less

Good one-way deal

$146 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.
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From Ontario to San Jose
Search Deals
One-way flight from Ontario to San Jose
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 29, 2025.

This Frontier deal was found by Cheapflights users on 4/28. 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.
Sun 5/1112:59 amONT - SJC
1 stop10h 21mFrontier
Mon 5/1912:20 pmSJC - ONT
1 stop11h 39mFrontier
Deal found 4/28$170
This Southwest deal was found by Cheapflights users on 4/28. 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 5/286:10 amONT - SJC
Nonstop1h 15mSouthwest
Wed 6/42:20 pmSJC - ONT
Nonstop1h 15mSouthwest
Deal found 4/28$175
This American Airlines deal was found by Cheapflights users on 4/28. 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 5/316:01 amONT - SJC
1 stop5h 57mAmerican Airlines
Sat 6/76:00 amSJC - ONT
1 stop6h 00mAmerican Airlines
Deal found 4/28$209
This Expedia deal was found by Cheapflights users on 4/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2112:08 amONT - SJC
1 stop11h 13mMultiple Airlines
Tue 5/271:31 pmSJC - ONT
1 stop9h 15mMultiple Airlines
Deal found 4/28$277
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 6/36:00 amONT - SJC
1 stop8h 51mAlaska Airlines
Tue 6/109:23 amSJC - ONT
2 stops13h 23mAlaska Airlines
Deal found 4/28$308
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/226:00 amONT - SJC
1 stop11h 28mDelta
Wed 5/282:10 pmSJC - ONT
1 stop8h 25mDelta
Deal found 4/28$343
This lastminute.com deal was found by Cheapflights users on 4/28. 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.
Thu 5/226:00 amONT - SJC
1 stop6h 36mHawaiian Airlines
Sun 5/259:09 pmSJC - ONT
1 stop13h 48mHawaiian Airlines
Deal found 4/28$358

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 April 29, 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

Sun 5/11

12:59 am-11:20 am

1 stop10h 21m

San Jose

Mon 5/19

12:20 pm-11:59 pm

1 stop11h 39m

$170

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 5/28

6:10 am-7:25 am

Nonstop1h 15m

San Jose

Wed 6/4

2:20 pm-3:35 pm

Nonstop1h 15m

$175

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 5/31

6:01 am-11:58 am

1 stop5h 57m

San Jose

Sat 6/7

6:00 am-12:00 pm

1 stop6h 00m

$209

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 5/21

12:08 am-11:21 am

1 stop11h 13m

San Jose

Tue 5/27

1:31 pm-10:46 pm

1 stop9h 15m

$277

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 6/3

6:00 am-2:51 pm

1 stop8h 51m

San Jose

Tue 6/10

9:23 am-10:46 pm

2 stops13h 23m

$308

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 5/22

6:00 am-5:28 pm

1 stop11h 28m

San Jose

Wed 5/28

2:10 pm-10:35 pm

1 stop8h 25m

$343

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 5/22

6:00 am-12:36 pm

1 stop6h 36m

San Jose

Sun 5/25

9:09 pm-10:57 am

1 stop13h 48m

$358

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 5/20

4:15 pm-10:02 am

1 stop17h 47m

San Jose

Thu 5/22

7:00 am-5:25 pm

1 stop10h 25m

$560

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 5/12

2:28 pm-6:41 pm

1 stop4h 13m

$88

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 5/28

12:45 pm-5:50 pm

1 stop5h 05m

$98

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 14 results
1
2

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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust 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 flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-San Jose flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Ontario-San Jose flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-San Jose flights, Cheapflights users trust CheapOair the most. CheapOair 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 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?

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 April 25, 2025.

Booking 6 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 $357). 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 April 29, 2025.

It’s optimal to fly from Ontario to San Jose in the evening. By choosing this option you can save up to 14% 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 March 30, 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. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Ontario to San Jose

Explore weekly flight availability from Ontario to San Jose. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 29, 2025.

The most flights from ONT to SJC are scheduled on a Monday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 on average).

Rainfall in San Jose by month

Plan your trip to San Jose by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Jose ranges from 0.0 - 3.1 inches per month. January is typically the wettest month, when rainfall can reach 3.1 in. July is typically the driest time to visit San Jose when rainfall is around 0.0 in.

Temperature in San Jose by month

Plan your trip to San Jose by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Jose, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 50.0 F).

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 April 29, 2025.
To help decide which airline to fly from Ontario to San Jose, see what other customers have to say about Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

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
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

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
4,292 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,401 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Entertainment

7.1

Crew

8.5

Overall

8.0

Boarding

8.2

Food

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 4 daily flights to San Jose from 4 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 22 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 $170, Frontier will fly you from Ontario to San Jose and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Southwest and American Airlines - these airlines can fly you to your destination from $175 and $209, respectively. Frontier is currently priced 17% 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 $86 on Frontier. Other airlines that offer cheap prices include Southwest from $88 and American Airlines from $105 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 $253, our data indicates the cheapest price to be $48. The most popular route (Ontario - San Jose), is priced around $168.

  • 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 $357). 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 4 airlines flying from Ontario to San Jose

Discover the top 4 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 April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$26Average$107FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$42Average$111FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$112Average$259FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$236Average$370FlexibilityNo cancel feeOn-time75%

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