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$49+ 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 5/22. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
Apr 1 — Apr 81
Tue 4/1
Tue 4/8
1 adult, Economy
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Cheapflights Tip: The best prices from San Jose to Ontario are usually found in May or August, booked 19 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

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 March 27, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

November

Cheapest in

May

Average price

$225

Good round-trip deal

$193 or less

Good one-way deal

$73 or less
Provider with most accurate pricing for San Jose-Ontario flight deals.
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Provider most trusted by Cheapflights users for San Jose-Ontario flights.
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From San Jose to Ontario
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One-way flight from San Jose to Ontario
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($65 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from San Jose to Ontario.
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Price to beat on a one-way flight from San Jose to Ontario.
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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 March 27, 2025.

This Southwest deal was found by Cheapflights users on 3/25. 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.
Tue 4/226:55 amSJC - ONT
Nonstop1h 15mSouthwest
Tue 4/222:35 pmONT - SJC
Nonstop1h 15mSouthwest
Deal found 3/25$97
This Frontier deal was found by Cheapflights users on 3/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/94:03 pmSJC - ONT
1 stop7h 56mFrontier
Thu 4/103:02 pmONT - SJC
1 stop5h 07mFrontier
Deal found 3/26$169
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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.
Tue 4/229:30 amSJC - ONT
1 stop14h 28mAlaska Airlines
Tue 4/297:00 amONT - SJC
1 stop9h 49mAlaska Airlines
Deal found 3/25$263
This Travelocity deal was found by Cheapflights users on 3/25. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/46:45 amSJC - ONT
1 stop9h 05mMultiple Airlines
Sat 6/712:59 amONT - SJC
1 stop10h 19mMultiple Airlines
Deal found 3/25$277
This Delta deal was found by Cheapflights users on 3/25. 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 6/42:25 pmSJC - ONT
1 stop8h 10mDelta
Thu 6/57:05 pmONT - SJC
1 stop15h 59mDelta
Deal found 3/25$333
This KAYAK deal was found by Cheapflights users on 3/25. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/136:00 amSJC - ONT
1 stop5h 59mAmerican Airlines
Tue 4/154:35 pmONT - SJC
1 stop6h 12mAmerican Airlines
Deal found 3/25$369
This lastminute.com deal was found by Cheapflights users on 3/26. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/155:00 pmSJC - ONT
1 stop16h 28mHawaiian Airlines
Wed 4/165:44 pmONT - SJC
1 stop14h 10mHawaiian Airlines
Deal found 3/26$389

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 March 27, 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 5/5

12:50 pm-2:10 pm

Nonstop1h 20m

Ontario

Thu 5/8

6:35 am-7:50 am

Nonstop1h 15m

$97

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 6/14

12:18 pm-11:50 pm

1 stop11h 32m

Ontario

Fri 6/20

12:59 am-11:18 am

1 stop10h 19m

$160

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 5/14

7:00 am-11:58 pm

1 stop16h 58m

Ontario

Tue 5/20

6:00 am-12:36 pm

1 stop6h 36m

$283

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 6/14

5:00 pm-11:59 pm

2 stops6h 59m

Ontario

Fri 6/20

12:59 am-11:18 am

1 stop10h 19m

$307

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 5/14

7:20 am-2:15 pm

1 stop6h 55m

Ontario

Mon 5/19

7:05 pm-11:04 am

1 stop15h 59m

$313

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 4/15

5:00 pm-9:28 am

1 stop16h 28m

Ontario

Wed 4/16

5:44 pm-7:54 am

1 stop14h 10m

$389

San JoseOntario

SJC - ONT

SJCONT

San Jose

Wed 4/23

9:47 am-3:59 pm

1 stop6h 12m

Ontario

Sun 4/27

12:50 pm-10:47 pm

1 stop9h 57m

$468

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 5/22

7:00 am-8:15 am

Nonstop1h 15m

$49

San JoseOntario

SJC - ONT

SJCONT

San Jose

Sat 4/12

2:40 pm-11:59 pm

1 stop9h 19m

$86

San JoseOntario

SJC - ONT

SJCONT

San Jose

Tue 5/20

9:23 am-6:25 pm

2 stops9h 02m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust 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 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 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 March 21, 2025.

To ensure you get the cheapest price possible for a flight from San Jose to Ontario, you should look to book at least 19 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 $326). 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 March 27, 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 23, 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 March 27, 2025.
Read through reviews of airlines operating flights from San Jose to Ontario, such as Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Alaska Airlines
8.0
Very good
9,795 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,895 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Hawaiian Airlines
7.9
Good
2,334 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 2 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, Southwest ($97), Frontier ($160), and Alaska Airlines ($263) offers the cheapest pricing from San Jose to Ontario. Southwest is 52% 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 Southwest, with whom users have recently found tickets for as low as $49. However, be on the lookout for offers from Frontier and Alaska 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 $97 on average our data indicates $212 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 $326). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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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 March 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$36Average$107FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$100FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$138Average$250FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$150Average$276FlexibilityNo cancel feeOn-time63%
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