HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$86+ Cheap flights from San Jose 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 August or July, booked 80 days in advance, depart on a Tuesday or Thursday and return on a Saturday

Cheap flight deals from San Jose to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from San Jose (SJC) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$170
(Frontier)

One-way from

$86
(Frontier)

Popular in

November

Cheapest in

August

Average price

$241

Good round-trip deal

$228 or less

Good one-way deal

$87 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. 14% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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

Find 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 April 29, 2025.

This CheapOair deal was found by Cheapflights users on 4/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1912:20 pmSJC - ONT
1 stop11h 39mFrontier
Wed 5/211:08 pmONT - SJC
1 stop24h 35mFrontier
Deal found 4/26$161
This Southwest deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/247:55 pmSJC - ONT
Nonstop1h 15mSouthwest
Mon 5/266:35 amONT - SJC
Nonstop1h 15mSouthwest
Deal found 4/28$186
This Alaska Airlines deal was found by Cheapflights users on 4/27. 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 5/2812:25 pmSJC - ONT
1 stop6h 00mAlaska Airlines
Sat 5/314:45 pmONT - SJC
1 stop5h 53mAlaska Airlines
Deal found 4/27$312
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2111:44 amSJC - ONT
1 stop10h 51mDelta
Thu 5/226:00 amONT - SJC
1 stop11h 28mDelta
Deal found 4/28$343
This American Airlines deal was found by Cheapflights users on 4/27. 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.
Tue 7/226:00 amSJC - ONT
1 stop6h 00mAmerican Airlines
Mon 7/284:45 pmONT - SJC
1 stop6h 14mAmerican Airlines
Deal found 4/27$363
This lastminute.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/226:45 amSJC - ONT
1 stop11h 40mHawaiian Airlines
Sun 5/2510:00 amONT - SJC
1 stop6h 29mHawaiian Airlines
Deal found 4/28$408
This Orbitz deal was found by Cheapflights users on 4/27. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/299:05 amSJC - ONT
1 stop12h 45mMultiple Airlines
Thu 5/110:52 amONT - SJC
1 stop7h 49mMultiple Airlines
Deal found 4/27$530
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Tue 5/208:30 amSJC - ONT
1 stop12h 23mUnited Airlines
Sat 5/246:41 pmONT - SJC
2 stops15h 34mUnited Airlines
Deal found 4/27$553

Cheapflights Fare Finder

Customize your flight search to find flights from San Jose to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 29, 2025.
Use the filters below to find and compare flights from San Jose to Ontario that are best for you.

Fly from

San Jose

Fly to

Ontario

Route

Depart

Return

Price

San JoseOntario

SJC - ONT

SJCONT

San Jose

Mon 5/19

12:20 pm-11:59 pm

1 stop11h 39m

Ontario

Wed 5/21

1:08 pm-1:43 pm

1 stop24h 35m

$161

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 5/24

7:55 pm-9:10 pm

Nonstop1h 15m

Ontario

Mon 5/26

6:35 am-7:50 am

Nonstop1h 15m

$186

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 5/28

12:25 pm-6:25 pm

1 stop6h 00m

Ontario

Sat 5/31

4:45 pm-10:38 pm

1 stop5h 53m

$312

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 5/21

11:44 am-10:35 pm

1 stop10h 51m

Ontario

Thu 5/22

6:00 am-5:28 pm

1 stop11h 28m

$343

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 7/22

6:00 am-12:00 pm

1 stop6h 00m

Ontario

Mon 7/28

4:45 pm-10:59 pm

1 stop6h 14m

$363

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 5/22

6:45 am-6:25 pm

1 stop11h 40m

Ontario

Sun 5/25

10:00 am-4:29 pm

1 stop6h 29m

$408

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 5/20

8:30 am-8:53 pm

1 stop12h 23m

Ontario

Sat 5/24

6:41 pm-10:15 am

2 stops15h 34m

$553

San JoseOntario

SJC - ONT

SJCONT

San Jose

Mon 5/19

12:20 pm-11:59 pm

1 stop11h 39m

$86

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 5/28

6:55 am-8:10 am

Nonstop1h 15m

$88

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 7/19

6:00 am-12:00 pm

1 stop6h 00m

$105

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 13 results
1
2

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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars

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

Use this chart to determine the optimal time to book a round-trip flight from San Jose to Ontario. Price data was last updated on April 25, 2025.

To ensure you get the cheapest price possible for a flight from San Jose to Ontario, you should look to book at least 79 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 San Jose to Ontario?

Currently, August is the cheapest month in which you can book a flight from San Jose to Ontario (average of $246). Flying from San Jose to Ontario in March is currently the most expensive (average of $328). 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?

Find hourly flight availability from San Jose to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 29, 2025.

It’s optimal to fly from San Jose to Ontario at noon. By choosing this option you can save up to 25% on the cost of your flight, compared to a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from San Jose to Ontario. Price data was last updated on March 30, 2025.

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

Rainfall in Ontario by month

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

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.

Temperature in Ontario by month

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

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).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated April 29, 2025.
Read through reviews of airlines operating flights from San Jose to Ontario, such as Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

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

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,292 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

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

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

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

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

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

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.1

Comfort

7.9

Crew

8.5

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 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?

    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 3 outbound flights from San Jose to Ontario offered by 4 different airlines.

  • How popular is this San Jose to Ontario flight route?

    Within the past month, 1 users have taken a look at flights from San Jose to Ontario.

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

    According to our current data, Frontier ($170), Southwest ($175), and American Airlines ($199) offers the cheapest pricing from San Jose to Ontario. Frontier is 25% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $86. However, be on the lookout for offers from Southwest and American Airlines, as they are both options that can get you from San Jose to Ontario for a low price.

  • What are the cheapest flights from San Jose to Ontario?

    Looking at all options, your cheapest flight can be booked for $48. While the most popular route (San Jose - Ontario) can be booked for $186 on average our data indicates $224 when flying from San Jose 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 to Ontario?

    Currently, August is the cheapest month in which you can book a flight from San Jose to Ontario (average of $246). Flying from San Jose to Ontario in March is currently the most expensive (average of $328). 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

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.
San Francisco to Las Vegas flights
Los Angeles to Las Vegas flights
San Francisco to Los Angeles flights
San Jose to Los Angeles flights
San Jose to Las Vegas flights
Los Angeles to San Francisco flights
Burbank to Las Vegas flights
Santa Ana to Las Vegas flights
Los Angeles to San Jose flights
Oakland to Los Angeles flights
Oakland to Las Vegas flights
San Francisco to Ontario flights
Los Angeles to Oakland flights
Oakland to Santa Ana flights
San Francisco to Santa Ana flights
San Francisco to San Diego flights
Ontario to San Francisco flights
San Jose to San Diego flights
Oakland to San Diego flights
Santa Ana to Oakland flights
Oakland to Burbank flights
San Francisco to Burbank flights
Burbank to Oakland flights
San Jose to Santa Ana flights
Ontario to Las Vegas flights
Sacramento to Los Angeles flights
Los Angeles to Sacramento flights
Santa Ana to San Francisco flights
San Diego to San Francisco flights
San Diego to Las Vegas flights
San Francisco to Palm Springs flights
Las Vegas to Los Angeles flights
Sacramento to San Diego flights
Sacramento to Las Vegas flights
Burbank to San Francisco flights
Santa Ana to San Jose flights
San Jose to Burbank flights
Los Angeles to Reno flights
San Diego to Oakland flights
San Diego to San Jose flights
Stockton to Las Vegas flights
Las Vegas to Santa Ana flights
San Diego to Sacramento flights
Santa Ana to Sacramento flights
Burbank to San Jose flights
Sacramento to Burbank flights
Burbank to Sacramento flights
Santa Rosa to Las Vegas flights
Sacramento to Santa Ana flights

Top 4 airlines flying from San Jose to Ontario

Discover the top 4 airlines that operate flights from San Jose to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$34Average$108FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$36Average$107FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$147Average$277FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$178Average$262FlexibilityNo cancel feeOn-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.