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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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJC
May 17 — May 241
Sat 5/17
Sat 5/24
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 76 days in advance, depart on a Saturday or Wednesday 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 May 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$160
(Frontier)

One-way from

$86
(Frontier)

Popular in

January

Cheapest in

August

Average price

$187

Good round-trip deal

$217 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. 21% potential increase in price ($55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
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.
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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 May 12, 2025.

This Frontier deal was found by Cheapflights users on 5/12. 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 6/56:00 amONT - SJC
1 stop7h 45mFrontier
Mon 6/92:30 pmSJC - ONT
1 stop6h 21mFrontier
Deal found 5/12$160
This Southwest deal was found by Cheapflights users on 5/11. 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.
Sun 8/311:10 pmONT - SJC
Nonstop1h 10mSouthwest
Sun 9/76:50 amSJC - ONT
1 stop6h 15mSouthwest
Deal found 5/11$185
This Expedia deal was found by Cheapflights users on 5/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/3012:59 amONT - SJC
1 stop10h 33mMultiple Airlines
Sun 9/79:30 amSJC - ONT
2 stops14h 29mMultiple Airlines
Deal found 5/11$283
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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.
Wed 10/87:10 amONT - SJC
1 stop5h 06mAlaska Airlines
Mon 10/133:00 pmSJC - ONT
1 stop8h 49mAlaska Airlines
Deal found 5/10$342
This American Airlines deal was found by Cheapflights users on 5/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/135:09 pmONT - SJC
1 stop5h 14mAmerican Airlines
Sat 1/312:46 pmSJC - ONT
1 stop5h 08mAmerican Airlines
Deal found 5/11$352
This Delta deal was found by Cheapflights users on 5/12. 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.
Wed 7/23:05 pmONT - SJC
1 stop19h 45mDelta
Thu 7/177:25 amSJC - ONT
1 stop9h 41mDelta
Deal found 5/12$403
This United Airlines deal was found by Cheapflights users on 5/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/116:32 pmONT - SJC
1 stop18h 49mUnited Airlines
Wed 6/187:00 amSJC - ONT
1 stop14h 04mUnited Airlines
Deal found 5/12$547

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 May 12, 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 6/5

6:00 am-1:45 pm

1 stop7h 45m

San Jose

Mon 6/9

2:30 pm-8:51 pm

1 stop6h 21m

$160

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 7/1

4:45 pm-5:55 pm

Nonstop1h 10m

San Jose

Wed 7/16

12:10 pm-1:25 pm

Nonstop1h 15m

$186

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sun 6/15

7:02 pm-10:46 pm

1 stop3h 44m

San Jose

Sat 9/6

6:04 am-11:29 am

1 stop5h 25m

$388

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 7/1

6:58 pm-9:08 am

1 stop14h 10m

San Jose

Sat 7/19

6:17 pm-1:26 pm

1 stop19h 09m

$402

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 7/2

3:05 pm-10:50 am

1 stop19h 45m

San Jose

Sat 7/19

5:55 pm-10:25 am

1 stop16h 30m

$403

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Sat 7/5

12:59 am-11:22 am

1 stop10h 23m

San Jose

Sun 7/20

8:00 am-12:13 am

2 stops16h 13m

$493

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 6/11

6:32 pm-1:21 pm

1 stop18h 49m

San Jose

Wed 6/18

7:00 am-9:04 pm

1 stop14h 04m

$547

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 6/2

6:00 am-1:40 pm

1 stop7h 40m

$86

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 6/11

4:45 pm-5:55 pm

Nonstop1h 10m

$99

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 7/22

4:45 pm-10:59 pm

1 stop6h 14m

$132

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/10

Showing 1-10 of 15 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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 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 May 9, 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 $354). 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 May 12, 2025.

It’s optimal to fly from Ontario to San Jose at noon. By choosing this option you can save up to 20% 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 May 11, 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.

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 May 12, 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
10,000 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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
4,290 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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
2,431 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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
8,724 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Overall

8.0

Comfort

7.9

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 3 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 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 $160, 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 $186 and $388, respectively. Frontier is currently priced 24% 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 $99 and American Airlines from $132 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 $246, our data indicates the cheapest price to be $87. The most popular route (Ontario - San Jose), is priced around $160.

  • 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 $354). 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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Alternative routes for Ontario to San Jose

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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 May 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$30Average$109FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$42Average$109FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$112Average$259FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$117Average$187FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$236Average$370FlexibilityNo cancel feeOn-time75%

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