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

The San Jose to Ontario flight path was viewed by 4 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

A quick flight from San Jose, California to Ontario can take about 6h 15m. Southwest provides one of the quickest options available for as low as $194. The distance from San Jose, California to Ontario is about 333 mi.

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

Cheapflights users have booked flights from San Jose, California to Ontario round-trip from $40. Other airlines that can offer you cheap pricing are United Airlines, from $68, and Southwest, from $113. Users have found that Frontier is 84% cheaper than the other options available to this destination.

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

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $19. However, be on the lookout for offers from Southwest and United Airlines, as they are both options that can get you from San Jose, California to Ontario for a low price.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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

Looking at all options, your cheapest flight can be booked for $96. While the most popular route (San Jose - Ontario) can be booked for $169 on average, our data indicates $356 when flying from San Jose, California to Ontario.

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

Before booking your flight from San Jose, California to Ontario check out the most popular airlines for this route: Southwest, Frontier or Alaska Airlines.

Most accurate provider : When it comes to deals on San Jose, California-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Jose, California-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Jose, California-Ontario flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on San Jose, California-Ontario flights, Cheapflights users trust eDreams the most. eDreams 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 San Jose, California-Ontario 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 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.

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.

$80+ Flights from San Jose, CA to Ontario

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

Find cheap flights from San Jose to Ontario 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 San Jose to Ontario are usually found in January or December, booked 27 days in advance, depart on a Thursday or Friday and return on a Tuesday

Cheap 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 December 30, 2025.

Sun 12/286:10 amSJC - ONT

1 stop5h 43mAmerican Airlines

Wed 12/316:20 amONT - SJC

1 stop6h 06mAmerican Airlines

Deal found 12/28

$539

Mon 12/292:29 pmSJC - ONT

1 stop6h 38mUnited Airlines

Wed 12/315:05 amONT - SJC

1 stop8h 28mUnited Airlines

Deal found 12/28

$571

Wed 12/312:29 pmSJC - ONT

1 stop6h 38mUnited Airlines

Tue 1/65:05 amONT - SJC

1 stop8h 34mUnited Airlines

Deal found 12/28

$593

Tue 12/309:56 amSJC - ONT

1 stop6h 11mAmerican Airlines

Wed 12/316:20 amONT - SJC

1 stop6h 06mAmerican Airlines

Deal found 12/28

$605

Wed 12/3112:10 pmSJC - ONT

1 stop3h 10mSouthwest

Thu 1/111:10 amONT - SJC

Nonstop1h 15mSouthwest

Deal found 12/29

$699

Mon 12/299:55 pmSJC - ONT

Nonstop1h 15mSouthwest

Wed 12/313:15 pmONT - SJC

Nonstop1h 15mSouthwest

Deal found 12/29

$703

Sun 12/282:29 pmSJC - ONT

1 stop6h 38mUnited Airlines

Tue 12/301:40 pmONT - SJC

1 stop7h 36mUnited Airlines

Deal found 12/27

$705

Tue 12/304:30 pmSJC - ONT

2 stops7h 25mSouthwest

Sat 1/35:10 amONT - SJC

2 stops5h 50mSouthwest

Deal found 12/28

$713

Sun 12/287:48 pmSJC - ONT

2 stops21h 27mFrontier

Tue 12/306:00 amONT - SJC

1 stop11h 42mFrontier

Deal found 12/27

$742

Best flights from San Jose to Ontario
Discover carefully curated flight deals from San Jose to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 30, 2025.

Tue 1/2710:55 amSJC - ONT

2 stops6h 15mSouthwest

Tue 2/35:55 amONT - SJC

1 stop4h 20mSouthwest

Deal found 12/29

$194

Sat 1/319:05 amSJC - ONT

1 stop6h 03mAlaska Airlines

Tue 2/311:53 amONT - SJC

1 stop8h 11mAlaska Airlines

Deal found 12/27

$264

Tue 2/247:35 amSJC - ONT

1 stop6h 15mSouthwest

Tue 3/35:55 amONT - SJC

2 stops6h 40mSouthwest

Deal found 12/28

$194

Wed 2/47:05 pmSJC - ONT

Nonstop1h 15mSouthwest

Sun 2/83:25 pmONT - SJC

2 stops6h 30mSouthwest

Deal found 12/28

$229

Wed 1/2811:00 amSJC - ONT

1 stop9h 36mAlaska Airlines

Sat 1/314:03 pmONT - SJC

1 stop17h 45mAlaska Airlines

Deal found 12/27

$264

Thu 2/58:00 amSJC - ONT

Nonstop1h 20mSouthwest

Mon 2/93:35 pmONT - SJC

2 stops5h 35mSouthwest

Deal found 12/28

$230

Thu 2/1211:35 amSJC - ONT

Nonstop1h 15mSouthwest

Fri 2/135:45 amONT - SJC

Nonstop1h 15mSouthwest

Deal found 12/29

$247

Fri 1/238:20 amSJC - ONT

Nonstop1h 15mSouthwest

Mon 1/264:40 pmONT - SJC

Nonstop1h 20mSouthwest

Deal found 12/28

$257

Fri 2/274:25 pmSJC - ONT

1 stop5h 00mSouthwest

Sun 3/15:25 pmONT - SJC

Nonstop1h 20mSouthwest

Deal found 12/28

$279

Last-minute flights from San Jose to Ontario
Discover last-minute flight deals from San Jose to Ontario. Data last updated December 30, 2025 and is based on user searches.

Mon 1/1911:14 amSJC - ONT

1 stop26h 23mMultiple Airlines

Sat 1/247:35 pmONT - SJC

2 stops16h 34mMultiple Airlines

Deal found 12/29

$190

Mon 1/1911:14 amSJC - ONT

1 stop6h 30mFrontier

Thu 1/2211:04 amONT - SJC

1 stop4h 07mFrontier

Deal found 12/29

$200

Mon 1/1911:14 amSJC - ONT

1 stop26h 23mFrontier

Sat 1/243:04 pmONT - SJC

1 stop18h 06mFrontier

Deal found 12/29

$204

Sun 1/251:04 pmSJC - ONT

1 stop23h 06mFrontier

Sun 2/15:21 pmONT - SJC

1 stop16h 21mFrontier

Deal found 12/28

$177

Sun 1/251:04 pmSJC - ONT

1 stop6h 28mFrontier

Thu 1/2911:04 amONT - SJC

1 stop4h 07mFrontier

Deal found 12/30

$211

Mon 1/2610:37 amSJC - ONT

1 stop4h 04mFrontier

Thu 1/2911:04 amONT - SJC

1 stop4h 07mFrontier

Deal found 12/28

$199

Tue 1/277:05 pmSJC - ONT

Nonstop1h 15mSouthwest

Tue 2/38:30 amONT - SJC

Nonstop1h 15mSouthwest

Deal found 12/29

$169

Thu 1/2912:34 pmSJC - ONT

1 stop24h 58mFrontier

Sun 2/18:27 pmONT - SJC

1 stop13h 15mFrontier

Deal found 12/28

$201

One-way flights from San Jose to Ontario
Search for one-way flight options from San Jose to Ontario. Find affordable one-way fares based on user searches. Data last updated December 30, 2025.

Mon 1/1911:14 amSJC - ONT

1 stop26h 23mFrontier

Deal found 12/29

$80

Sat 1/106:00 amSJC - ONT

1 stop6h 03mAmerican Airlines

Deal found 12/30

$81

Sun 1/251:04 pmSJC - ONT

1 stop23h 06mFrontier

Deal found 12/28

$82

Sun 1/1811:14 amSJC - ONT

1 stop4h 25mFrontier

Deal found 12/28

$83

Tue 1/277:05 pmSJC - ONT

Nonstop1h 15mSouthwest

Deal found 12/28

$85

Mon 1/197:31 pmSJC - ONT

2 stops18h 06mMultiple Airlines

Deal found 12/30

$95

Mon 1/2610:37 amSJC - ONT

1 stop4h 04mFrontier

Deal found 12/30

$99

Thu 1/2912:34 pmSJC - ONT

1 stop7h 19mFrontier

Deal found 12/30

$102

Find flight deals from San Jose to Ontario

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$154 (Kiwi.com)
One-way from	$80 (Kiwi.com)
Popular in	October
Cheapest in	January
Average price	$242
Good round-trip deal	$359 or less
Good one-way deal	$174 or less

Provider with most accurate pricing for San Jose-Ontario flight deals.

Search Deals

Provider most trusted by Cheapflights users for San Jose-Ontario flights.

Search Deals

From San Jose to Ontario

Search Deals

One-way flight from San Jose to Ontario

Search Deals

Highest demand for flights based on searches. 5% potential increase in price ($14 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 December 2025

Search Deals

Price to beat on a round-trip flight from San Jose to Ontario.

Search Deals

Price to beat on a one-way flight from San Jose to Ontario.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 1/27

10:55 am-5:10 pm

2 stops6h 15m

Ontario

Tue 2/3

5:55 am-10:15 am

1 stop4h 20m

$194

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 2/24

7:35 am-1:50 pm

1 stop6h 15m

Ontario

Tue 3/3

5:55 am-12:35 pm

2 stops6h 40m

$194

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 2/4

7:05 pm-8:20 pm

Nonstop1h 15m

Ontario

Sun 2/8

3:25 pm-9:55 pm

2 stops6h 30m

$229

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 2/5

8:00 am-9:20 am

Nonstop1h 20m

Ontario

Mon 2/9

3:35 pm-9:10 pm

2 stops5h 35m

$230

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 2/12

11:35 am-12:50 pm

Nonstop1h 15m

Ontario

Fri 2/13

5:45 am-7:00 am

Nonstop1h 15m

$247

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 1/23

8:20 am-9:35 am

Nonstop1h 15m

Ontario

Mon 1/26

4:40 pm-6:00 pm

Nonstop1h 20m

$257

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 1/31

9:05 am-3:08 pm

1 stop6h 03m

Ontario

Tue 2/3

11:53 am-8:04 pm

1 stop8h 11m

$264

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 1/28

11:00 am-8:36 pm

1 stop9h 36m

Ontario

Sat 1/31

4:03 pm-9:48 am

1 stop17h 45m

$264

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 2/27

4:25 pm-9:25 pm

1 stop5h 00m

Ontario

Sun 3/1

5:25 pm-6:45 pm

Nonstop1h 20m

$279

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 2/24

5:30 pm-8:45 pm

1 stop3h 15m

$95

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

Showing 1-10 of 20 results

Compare providers for flights from San Jose to Ontario

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Jose to Ontario in December.

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

*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 San Jose, California-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Jose, California-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Jose, California-Ontario flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on San Jose, California-Ontario flights, Cheapflights users trust eDreams the most. eDreams 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 San Jose, California-Ontario 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 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, California to Ontario?

The price you pay for your flight from San Jose, California to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 27 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, February is the cheapest month in which you can book a flight from San Jose, California to Ontario (average of $19). Flying from San Jose, California to Ontario in September is currently the most expensive (average of $60). 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?

It’s optimal to fly from San Jose, California to Ontario at noon. By choosing this option you can save up to 9% on the cost of your flight, compared to a flight in the morning.

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

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

The best insider tips for San Jose to Ontario flights

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.

ONT

Consider renting a car at ONT for quick access to I-10, ideal for exploring Southern California.

Our travel experts

Bill Fink

Expert on ONT

Daniel Scheffler

Expert on SJC

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Alaska Airlines, Southwest, and United 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

11,575 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Alaska Airlines

8.0

Very good

11,575 reviews

Alaska Airlines

8.0

Very good

11,575 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Southwest

8.0

Very good

4,251 reviews

Alaska Airlines

8.0

Very good

11,575 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

United Airlines

7.4

Good

9,124 reviews

Alaska Airlines

8.0

Very good

11,575 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Frontier

5.7

Fair

3,067 reviews

Alaska Airlines

8.0

Very good

11,575 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

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, California to Ontario flight route?
The San Jose to Ontario flight path was viewed by 4 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
How long is the flight from San Jose, California to Ontario?
A quick flight from San Jose, California to Ontario can take about 6h 15m. Southwest provides one of the quickest options available for as low as $194. The distance from San Jose, California to Ontario is about 333 mi.
What are the cheapest airlines flying from San Jose, California to Ontario round-trip?
Cheapflights users have booked flights from San Jose, California to Ontario round-trip from $40. Other airlines that can offer you cheap pricing are United Airlines, from $68, and Southwest, from $113. Users have found that Frontier is 84% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from San Jose, California to Ontario one-way?
The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $19. However, be on the lookout for offers from Southwest and United Airlines, as they are both options that can get you from San Jose, California to Ontario for a low price.
What are the cheapest flights from San Jose, California to Ontario?
Looking at all options, your cheapest flight can be booked for $96. While the most popular route (San Jose - Ontario) can be booked for $169 on average, our data indicates $356 when flying from San Jose, California 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, California to Ontario?
Currently, February is the cheapest month in which you can book a flight from San Jose, California to Ontario (average of $19). Flying from San Jose, California to Ontario in September is currently the most expensive (average of $60). 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 San Jose to Ontario

San Francisco to Las Vegas flights

Los Angeles to Las Vegas flights

Burbank to Las Vegas flights

Santa Ana to Las Vegas flights

San Francisco to Los Angeles flights

Los Angeles to San Francisco flights

San Francisco to Ontario flights

San Jose to Los Angeles flights

Ontario to San Francisco flights

San Jose to Las Vegas flights

San Francisco to Santa Ana flights

Santa Ana to San Francisco flights

Sacramento to Las Vegas flights

San Francisco to Palm Springs flights

San Francisco to San Diego flights

Ontario to Las Vegas flights

Los Angeles to San Jose flights

Oakland to Las Vegas flights

San Diego to Las Vegas flights

San Diego to San Francisco flights

Burbank to San Francisco flights

Los Angeles to Reno flights

San Francisco to Burbank flights

Los Angeles to Sacramento flights

Sacramento to Los Angeles flights

Las Vegas to Los Angeles flights

San Jose to Santa Ana flights

Sacramento to Ontario flights

Fresno to Las Vegas flights

Santa Rosa to Las Vegas flights

Las Vegas to San Francisco flights

Stockton to Las Vegas flights

Las Vegas to Burbank flights

Las Vegas to Santa Ana flights

Sacramento to San Diego flights

San Diego to San Jose flights

Sacramento to Santa Ana flights

Burbank to Reno flights

Santa Ana to San Jose flights

San Francisco to Long Beach flights

San Jose to San Diego flights

Long Beach to Las Vegas flights

Ontario to San Jose flights

Oakland to San Diego flights

Reno to Las Vegas flights

Santa Ana to Reno flights

San Jose to Palm Springs flights

Reno to Los Angeles flights

Ontario to Reno flights

Complete your trip

Ontario car rentals

Los Angeles Airport car rentals

Ontario Airport car rentals

Burbank Bob Hope Airport car rentals

Long Beach Municipal Airport car rentals

Los Angeles car rentals

San Diego car rentals

San Francisco car rentals

San Jose car rentals

Sacramento car rentals

Fresno car rentals

Burbank car rentals

Other flights to Ontario

Top 4 airlines flying from San Jose to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$59	Average$151	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$68	Average$287	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$113	Average$278	FlexibilityNo cancel fee	On-time63%
Alaska Airlines	Cheapest$204	Average$262	FlexibilityNo cancel fee	On-time75%

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.

$80+ Cheap flights from San Jose, CA 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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from San Jose to Ontario 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 San Jose to Ontario are usually found in January or December, booked 27 days in advance, depart on a Thursday or Friday and return on a Tuesday

Cheap flight deals from San Jose to Ontario

Cheapest flights from San Jose to OntarioExplore 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 December 30, 2025.

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 December 30, 2025.

Find flight deals from San Jose to Ontario

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 San Jose to Ontario that are best for you.

Compare providers for flights from San Jose to Ontario

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 San Jose to Ontario in December.

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.

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, California to Ontario?

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

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

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

The best insider tips for San Jose to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.

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

Airports

SJC

ONT

Our travel experts

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Alaska Airlines, Southwest, and United 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.

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?

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

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

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

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

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

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

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

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

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

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 San Jose to Ontario

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

Top 4 airlines flying from San Jose to Ontario

100% Free

Book with Flexibility

Travel Smart

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 December 30, 2025.