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

Within the past month, 30 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 1h 15m. Your travel time will be generally consistent. Ontario and San Jose, California are separated by a distance of 333 mi. All flights are typically nonstop.

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

Frontier, at $39, 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 84% cheaper than the other options available to this destination.

In terms of precipitation, rainfall in San Jose, California 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, California when rainfall is around 0.0 in.

If weather is an important factor for your trip to San Jose, California, 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).

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 $295, our data indicates the cheapest price to be $48. The most popular route (Ontario - San Jose), is priced around $179.

What are the most popular airlines that fly from Ontario to San Jose, California?

When booking a flight from Ontario to San Jose, California, you may want to consider flying on Southwest, Frontier or United Airlines as they are the most popular for this route.

Most accurate provider : When it comes to deals on Ontario-San Jose, California 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, California flight deals on Cheapflights vs. CheapOair >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 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, California flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 is 1 daily flight to San Jose from 3 different airlines. 1h 15m is how long a flight from Ontario to San Jose will take if you book a nonstop flight.

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.

$55+ Cheap Flights from Ontario to San Jose, CA

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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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to San Jose are usually found in May or April, booked 25 days in advance, depart on a Saturday or Tuesday and return on a Monday

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 November 2, 2025.

Thu 11/137:44 pmONT - SJC

1 stop21h 50mFrontier

Mon 11/176:19 pmSJC - ONT

1 stop3h 38mFrontier

Deal found 10/30

$110

Fri 12/126:15 amONT - SJC

1 stop12h 58mFrontier

Sun 12/143:27 pmSJC - ONT

1 stop22h 37mFrontier

Deal found 10/31

$142

Mon 12/228:30 pmONT - SJC

Nonstop1h 20mSouthwest

Mon 1/56:30 amSJC - ONT

1 stop3h 50mSouthwest

Deal found 10/30

$179

Mon 12/156:50 pmONT - SJC

Nonstop1h 15mSouthwest

Wed 12/177:05 amSJC - ONT

Nonstop1h 15mSouthwest

Deal found 11/1

$181

Thu 11/67:44 pmONT - SJC

1 stop21h 50mFrontier

Mon 11/1012:27 pmSJC - ONT

1 stop11h 23mFrontier

Deal found 10/31

$190

Fri 12/56:15 amONT - SJC

1 stop12h 58mFrontier

Sun 12/73:27 pmSJC - ONT

1 stop5h 50mFrontier

Deal found 11/2

$210

Best flights from Ontario to San Jose
Discover carefully curated flight deals from Ontario to San Jose that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 2, 2025.

Wed 12/103:15 pmONT - SJC

Nonstop1h 15mSouthwest

Sat 12/137:05 amSJC - ONT

Nonstop1h 15mSouthwest

Deal found 11/1

$181

Mon 12/156:50 pmONT - SJC

Nonstop1h 15mSouthwest

Wed 12/177:05 amSJC - ONT

Nonstop1h 15mSouthwest

Deal found 11/1

$181

Mon 12/228:30 pmONT - SJC

Nonstop1h 20mSouthwest

Mon 1/54:50 pmSJC - ONT

2 stops6h 25mSouthwest

Deal found 10/30

$184

Thu 1/111:10 amONT - SJC

Nonstop1h 15mSouthwest

Sat 1/243:40 pmSJC - ONT

Nonstop1h 20mSouthwest

Deal found 11/1

$236

Last-minute flights from Ontario to San Jose
Discover last-minute flight deals from Ontario to San Jose. Data last updated November 2, 2025 and is based on user searches.

Thu 11/67:44 pmONT - SJC

1 stop21h 50mFrontier

Mon 11/1012:27 pmSJC - ONT

1 stop11h 23mFrontier

Deal found 10/31

$190

Thu 11/137:44 pmONT - SJC

1 stop21h 50mFrontier

Mon 11/176:19 pmSJC - ONT

1 stop3h 38mFrontier

Deal found 10/30

$110

Fri 11/146:00 amONT - SJC

1 stop11h 34mFrontier

Mon 11/176:19 pmSJC - ONT

1 stop3h 38mFrontier

Deal found 10/31

$300

Sun 11/164:05 pmONT - SJC

1 stop19h 27mFrontier

Mon 11/176:19 pmSJC - ONT

1 stop3h 38mFrontier

Deal found 11/2

$302

Sat 11/227:20 pmONT - SJC

Nonstop1h 15mSouthwest

Sun 11/237:35 pmSJC - ONT

Nonstop1h 15mSouthwest

Deal found 10/30

$299

Sat 11/225:40 amONT - SJC

2 stops7h 40mSouthwest

Mon 11/241:50 pmSJC - ONT

2 stops6h 45mSouthwest

Deal found 11/1

$309

Wed 11/2611:30 amONT - SJC

Nonstop1h 20mSouthwest

Sat 11/297:35 amSJC - ONT

Nonstop1h 15mSouthwest

Deal found 11/1

$319

One-way flights from Ontario to San Jose
Search for one-way flight options from Ontario to San Jose. Find affordable one-way fares based on user searches. Data last updated November 2, 2025.

Thu 1/226:30 amONT - SJC

1 stop4h 26mFrontier

Deal found 11/2

$55

Thu 11/203:31 pmONT - SJC

1 stop26h 03mFrontier

Deal found 11/1

$61

Mon 1/126:30 amONT - SJC

1 stop11h 25mFrontier

Deal found 10/31

$65

Sun 1/256:30 amONT - SJC

1 stop4h 26mFrontier

Deal found 10/31

$73

Sat 1/318:30 amONT - SJC

1 stop26h 26mFrontier

Deal found 11/1

$74

Wed 1/218:30 amONT - SJC

1 stop26h 26mFrontier

Deal found 10/31

$75

Thu 1/86:30 amONT - SJC

1 stop11h 25mFrontier

Deal found 11/1

$81

Tue 1/134:40 pmONT - SJC

Nonstop1h 20mSouthwest

Deal found 11/2

$85

Sat 1/312:55 pmONT - SJC

Nonstop1h 15mSouthwest

Deal found 11/1

$97

Sun 1/113:26 pmONT - SJC

1 stop26h 29mFrontier

Deal found 11/2

$98

Wed 12/316:45 amONT - SJC

2 stops31h 47mFrontier

Deal found 11/2

$100

Cheap flight deals from Ontario to San Jose

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$110 (Mytrip)
One-way from	$55 (CheapOair)
Popular in	November
Cheapest in	May
Average price	$287
Good round-trip deal	$272 or less
Good one-way deal	$159 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. 8% potential increase in price ($23 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 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.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 12/10

3:15 pm-4:30 pm

Nonstop1h 15m

San Jose

Sat 12/13

7:05 am-8:20 am

Nonstop1h 15m

$181

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 12/15

6:50 pm-8:05 pm

Nonstop1h 15m

San Jose

Wed 12/17

7:05 am-8:20 am

Nonstop1h 15m

$181

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 12/22

8:30 pm-9:50 pm

Nonstop1h 20m

San Jose

Mon 1/5

4:50 pm-11:15 pm

2 stops6h 25m

$184

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 1/1

11:10 am-12:25 pm

Nonstop1h 15m

San Jose

Sat 1/24

3:40 pm-5:00 pm

Nonstop1h 20m

$236

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 1/13

8:30 am-9:45 am

Nonstop1h 15m

$85

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 1/6

4:40 pm-6:00 pm

Nonstop1h 20m

$85

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 1/21

12:10 pm-1:30 pm

Nonstop1h 20m

$85

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 12/16

11:10 am-12:25 pm

Nonstop1h 15m

$85

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 1/20

8:30 am-9:45 am

Nonstop1h 15m

$85

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 1/7

6:05 am-12:35 pm

1 stop6h 30m

$95

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/31

Showing 1-10 of 15 results

Compare providers for flights from Ontario to San Jose

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 November.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
CheapOair	Price Accuracy3 stars	Trust 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-San Jose, California flight deals on Cheapflights vs. CheapOair >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 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, 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?

To ensure you get the cheapest price possible for a flight from Ontario to San Jose, California, you should look to book at least 25 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, December is the cheapest month in which you can book a flight from Ontario to San Jose, California (average of $17). Flying from Ontario to San Jose, California in August is currently the most expensive (average of $57). 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?

It’s optimal to fly from Ontario to San Jose, California 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, California?

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

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.

SJC

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

Our travel experts

Bill Fink

Expert on ONT

Daniel Scheffler

Expert on SJC

Reviews of airlines servicing San Jose

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

4,241 reviews

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

4,241 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

United Airlines

7.4

Good

8,993 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,119 reviews

Southwest

8.0

Very good

4,241 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Related info for your journey

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 is 1 daily flight to San Jose from 3 different airlines. 1h 15m 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, 30 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 1h 15m. Your travel time will be generally consistent. Ontario and San Jose, California are separated by a distance of 333 mi. All flights are typically nonstop.
What are the cheapest airlines flying from Ontario to San Jose, California round-trip?
Frontier, at $39, 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 84% 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 $295, our data indicates the cheapest price to be $48. The most popular route (Ontario - San Jose), is priced around $179.
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, December is the cheapest month in which you can book a flight from Ontario to San Jose, California (average of $17). Flying from Ontario to San Jose, California in August is currently the most expensive (average of $57). 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

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from Ontario to San Jose

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$39	Average$126	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$89	Average$187	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$97	Average$259	FlexibilityNo cancel fee	On-time63%

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$55+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to San Jose with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Ontario to San Jose are usually found in May or April, booked 25 days in advance, depart on a Saturday or Tuesday and return on a Monday

Find flight deals from Ontario to San Jose

Cheapest flights from Ontario to San JoseExplore 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 November 2, 2025.

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 November 2, 2025.

Cheap flight deals from Ontario to San Jose

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to San Jose that are best for you.

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 November.

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.

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?

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

What is the cheapest time of day to fly from ONT to SJC?

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

The best insider tips for Ontario to San Jose flights

Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to San Jose trip

Airports

ONT

SJC

Our travel experts

Reviews of airlines servicing San Jose

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.

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?

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

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

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

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to San Jose

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Ontario to San Jose

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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 November 2, 2025.