How popular is this Ontario to San Jose flight route?

The Ontario to San Jose flight path was viewed by 20 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. Search Cheapflights for deals from Frontier and American Airlines - these airlines can fly you to your destination from $180 and $316, respectively. Southwest is currently priced 50% 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 $90 and Alaska 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 $209, our data indicates the cheapest price to be $58. The most popular route (Ontario - San Jose), is priced around $97.

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

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

What is the cheapest day to fly round-trip from Ontario to San Jose?

Sunday flights are found to be more expensive to fly from Ontario to San Jose. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to San Jose.

How far in advance should I book a flight from Ontario to San Jose?

To save up to 114% on this flight, we recommend booking at least 53 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to San Jose from $96 1-2 weeks out and tickets from $173 for flights departing within the next 72 hours.

What is the cheapest month to fly from Ontario to San Jose?

Our data shows that September tends to be the cheapest month to fly to San Jose from Ontario. Users have commonly found prices around $124 for the month, but tickets can be as low as $34. Due to multiple factors, prepare for potentially higher prices in April.

Most accurate provider : When it comes to deals on Ontario-San Jose flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Jose flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

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.

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.

$49+ Flights from Ontario to San Jose

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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 July or August, booked 6 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

Cheap flight deals from Ontario to San Jose

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$97 (Southwest)
One-way from	$49 (Southwest)
Popular in	January
Cheapest in	July
Average price	$233
Good round-trip deal	$183 or less
Good one-way deal	$73 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. 26% potential increase in price ($69 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 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

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 March 25, 2025.

Mon 5/58:15 pmONT - SJC

Nonstop1h 10mSouthwest

Thu 5/84:30 pmSJC - ONT

Nonstop1h 20mSouthwest

Deal found 3/24

$97

Tue 4/82:43 pmONT - SJC

1 stop3h 55mFrontier

Sat 4/122:40 pmSJC - ONT

1 stop9h 19mFrontier

Deal found 3/24

$180

Thu 5/112:50 pmONT - SJC

1 stop5h 53mAmerican Airlines

Fri 5/27:20 pmSJC - ONT

1 stop16h 39mAmerican Airlines

Deal found 3/24

$316

Tue 4/228:59 pmONT - SJC

1 stop17h 51mAlaska Airlines

Tue 4/299:30 amSJC - ONT

2 stops10h 59mAlaska Airlines

Deal found 3/24

$318

Fri 5/2312:59 amONT - SJC

1 stop10h 22mMultiple Airlines

Mon 5/266:45 amSJC - ONT

2 stops17h 12mMultiple Airlines

Deal found 3/24

$403

Wed 6/115:45 pmONT - SJC

1 stop17h 03mDelta

Mon 6/167:20 amSJC - ONT

2 stops16h 24mDelta

Deal found 3/24

$469

Wed 4/236:00 amONT - SJC

2 stops15h 25mUnited Airlines

Wed 4/308:30 amSJC - ONT

1 stop12h 12mUnited Airlines

Deal found 3/24

$511

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 March 25, 2025.

Mon 5/58:15 pmONT - SJC

Nonstop1h 10mSouthwest

Thu 5/84:30 pmSJC - ONT

Nonstop1h 20mSouthwest

Deal found 3/24

$97

Tue 4/82:43 pmONT - SJC

1 stop3h 55mFrontier

Sat 4/122:40 pmSJC - ONT

1 stop9h 19mFrontier

Deal found 3/24

$180

Thu 5/112:50 pmONT - SJC

1 stop5h 53mAmerican Airlines

Fri 5/27:20 pmSJC - ONT

1 stop16h 39mAmerican Airlines

Deal found 3/24

$316

Tue 4/228:59 pmONT - SJC

1 stop17h 51mAlaska Airlines

Tue 4/299:30 amSJC - ONT

2 stops10h 59mAlaska Airlines

Deal found 3/24

$318

Fri 5/2312:59 amONT - SJC

1 stop10h 22mMultiple Airlines

Mon 5/266:45 amSJC - ONT

2 stops17h 12mMultiple Airlines

Deal found 3/24

$403

Wed 6/115:45 pmONT - SJC

1 stop17h 03mDelta

Mon 6/167:20 amSJC - ONT

2 stops16h 24mDelta

Deal found 3/24

$469

Wed 4/236:00 amONT - SJC

2 stops15h 25mUnited Airlines

Wed 4/308:30 amSJC - ONT

1 stop12h 12mUnited Airlines

Deal found 3/24

$511

Last-minute flights from Ontario to San Jose
Discover last-minute flight deals from Ontario to San Jose. Data last updated March 25, 2025 and is based on user searches.

Sun 3/306:00 amONT - SJC

2 stops10h 31mDelta

Sat 4/57:00 amSJC - ONT

2 stops9h 33mDelta

Deal found 3/24

$1,411

Tue 4/12:43 pmONT - SJC

1 stop3h 45mFrontier

Wed 4/25:34 pmSJC - ONT

1 stop13h 51mFrontier

Deal found 3/24

$182

Thu 4/35:40 amONT - SJC

1 stop3h 20mSouthwest

Thu 4/34:55 pmSJC - ONT

1 stop4h 15mSouthwest

Deal found 3/23

$490

Thu 4/33:55 pmONT - SJC

2 stops18h 07mMultiple Airlines

Sun 4/68:45 pmSJC - ONT

2 stops14h 20mMultiple Airlines

Deal found 3/24

$1,138

Fri 4/45:00 amONT - SJC

1 stop16h 25mUnited Airlines

Wed 4/96:27 pmSJC - ONT

2 stops16h 38mUnited Airlines

Deal found 3/24

$730

Fri 4/46:55 amONT - SJC

2 stops9h 45mAlaska Airlines

Wed 4/96:15 amSJC - ONT

2 stops12h 08mAlaska Airlines

Deal found 3/24

$740

Tue 4/82:43 pmONT - SJC

1 stop3h 55mFrontier

Sat 4/122:40 pmSJC - ONT

1 stop9h 19mFrontier

Deal found 3/24

$180

Fri 4/183:55 pmONT - SJC

2 stops18h 07mMultiple Airlines

Sun 4/206:15 amSJC - ONT

2 stops14h 06mMultiple Airlines

Deal found 3/24

$963

Tue 4/227:00 pmONT - SJC

Nonstop1h 10mSouthwest

Tue 4/292:20 pmSJC - ONT

Nonstop1h 15mSouthwest

Deal found 3/23

$97

Tue 4/224:35 pmONT - SJC

1 stop6h 12mAmerican Airlines

Tue 4/2912:50 pmSJC - ONT

1 stop5h 37mAmerican Airlines

Deal found 3/24

$269

Tue 4/228:59 pmONT - SJC

1 stop17h 51mAlaska Airlines

Tue 4/299:30 amSJC - ONT

2 stops10h 59mAlaska Airlines

Deal found 3/24

$318

Wed 4/236:00 amONT - SJC

2 stops15h 25mUnited Airlines

Wed 4/308:30 amSJC - ONT

1 stop12h 12mUnited Airlines

Deal found 3/24

$511

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 March 25, 2025.

Tue 5/132:35 pmONT - SJC

Nonstop1h 15mSouthwest

Deal found 3/25

$49

Tue 4/12:43 pmONT - SJC

1 stop3h 45mFrontier

Deal found 3/24

$90

Tue 5/205:55 pmONT - SJC

1 stop5h 01mAlaska Airlines

Deal found 3/25

$132

Tue 4/222:35 pmONT - SJC

1 stop7h 35mDelta

Deal found 3/25

$152

Thu 5/226:01 amONT - SJC

1 stop5h 57mAmerican Airlines

Deal found 3/25

$160

Sat 5/246:41 pmONT - SJC

2 stops15h 34mUnited Airlines

Deal found 3/24

$273

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Mon 5/5

8:15 pm-9:25 pm

Nonstop1h 10m

San Jose

Thu 5/8

4:30 pm-5:50 pm

Nonstop1h 20m

$97

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 4/8

2:43 pm-6:38 pm

1 stop3h 55m

San Jose

Sat 4/12

2:40 pm-11:59 pm

1 stop9h 19m

$180

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Thu 5/1

12:50 pm-6:43 pm

1 stop5h 53m

San Jose

Fri 5/2

7:20 pm-11:59 am

1 stop16h 39m

$316

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 4/22

8:59 pm-2:50 pm

1 stop17h 51m

San Jose

Tue 4/29

9:30 am-8:29 pm

2 stops10h 59m

$318

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Fri 5/23

12:59 am-11:21 am

1 stop10h 22m

San Jose

Mon 5/26

6:45 am-11:57 pm

2 stops17h 12m

$403

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 6/11

5:45 pm-10:48 am

1 stop17h 03m

San Jose

Mon 6/16

7:20 am-11:44 pm

2 stops16h 24m

$469

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Wed 4/23

6:00 am-9:25 pm

2 stops15h 25m

San Jose

Wed 4/30

8:30 am-8:42 pm

1 stop12h 12m

$511

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 5/13

2:35 pm-3:50 pm

Nonstop1h 15m

$49

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 4/1

2:43 pm-6:28 pm

1 stop3h 45m

$90

OntarioSan Jose

ONT - SJC

ONTSJC

Ontario

Tue 5/20

5:55 pm-10:56 pm

1 stop5h 01m

$132

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 13 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 March.

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

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 $366). 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 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?

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

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 (1 on average).

Rainfall in San Jose 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

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

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

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Alaska Airlines

8.0

Very good

9,782 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Southwest

8.0

Very good

4,272 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Delta

8.0

Very good

7,890 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

United Airlines

7.4

Good

8,605 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,782 reviews

Reviews

1 / 20

10.0

Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

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 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 20 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. Search Cheapflights for deals from Frontier and American Airlines - these airlines can fly you to your destination from $180 and $316, respectively. Southwest is currently priced 50% 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 $90 and Alaska 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 $209, our data indicates the cheapest price to be $58. The most popular route (Ontario - San Jose), is priced around $97.
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 $366). 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

Alternative routes for Ontario to San Jose

Los Angeles to Las Vegas flights

San Francisco to Los Angeles flights

San Francisco to Las Vegas flights

San Jose to Los Angeles flights

Los Angeles to San Francisco flights

Burbank to Las Vegas flights

Oakland to Los Angeles flights

Santa Ana to Las Vegas flights

Los Angeles to San Jose flights

Oakland to Las Vegas flights

Los Angeles to Oakland flights

San Francisco to Ontario flights

San Francisco to Santa Ana flights

San Jose to Las Vegas flights

Oakland to Santa Ana flights

Sacramento to Los Angeles flights

San Francisco to San Diego flights

Oakland to San Diego flights

Ontario to San Francisco flights

Ontario to Las Vegas flights

Santa Ana to San Francisco flights

San Francisco to Burbank flights

Santa Ana to Oakland flights

Oakland to Burbank flights

Los Angeles to Sacramento flights

San Diego to Las Vegas flights

San Jose to San Diego flights

Sacramento to Las Vegas flights

Sacramento to San Diego flights

San Jose to Santa Ana flights

Burbank to San Francisco flights

Burbank to Oakland flights

Las Vegas to Los Angeles flights

San Diego to San Francisco flights

San Jose to Ontario flights

San Francisco to Palm Springs flights

Santa Ana to San Jose flights

Fresno to Las Vegas flights

San Diego to San Jose flights

Sacramento to Burbank flights

Long Beach to Las Vegas flights

Sacramento to Santa Ana flights

Los Angeles to Reno flights

Santa Ana to Sacramento flights

Las Vegas to Burbank flights

San Francisco to Long Beach flights

San Diego to Sacramento flights

Burbank to Sacramento flights

Stockton to Las Vegas flights

San Diego to Oakland flights

Complete your trip

San Jose car rentals

San Jose Airport car rentals

San Francisco Airport car rentals

Oakland Airport car rentals

Monterey Regional Airport car rentals

Stockton Airport car rentals

Los Angeles car rentals

San Francisco car rentals

San Diego car rentals

Fresno car rentals

Ontario car rentals

Sacramento car rentals

Other flights to San Jose

Top 5 airlines flying from Ontario to San Jose

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$26	Average$101	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$42	Average$127	FlexibilityNo cancel fee	On-time65%
Southwest	Cheapest$131	Average$259	FlexibilityNo cancel fee	On-time63%
Alaska Airlines	Cheapest$236	Average$370	FlexibilityNo cancel fee	On-time75%
American Airlines	Cheapest$273	Average$486	FlexibilityNo cancel fee	On-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$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 5/13. 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 July or August, booked 6 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

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

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 March 25, 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 March 25, 2025.

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 March.

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?

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 March 21, 2025.

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

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 March 25, 2025.

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 23, 2025.

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 March 25, 2025.

Rainfall in San Jose by month

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

Temperature in San Jose by month

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

Reviews of airlines servicing San Jose

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 flight route?

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

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

What are the cheapest flights from Ontario to San Jose?

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?

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 5 airlines flying from Ontario to San Jose

100% Free

Book with Flexibility

Travel Smart

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 March 25, 2025.