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$147+ Cheap flights from San José (SJO) to Ontario (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 11/20. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Cheapflights Tip: The best prices from San José Juan Santamaria Intl to Ontario are usually found in October or May, booked 3 days in advance, depart on a Tuesday or Friday and return on a Monday

Cheap flight deals from San José to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from San José (SJO) 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 November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$267
(United Airlines)

One-way from

$147
(Cheapflightsfares)

Popular in

February

Cheapest in

October

Average price

$472
Provider with most accurate pricing for San José Juan Santamaria Intl-Ontario flight deals.
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Provider most trusted by Cheapflights users for San José Juan Santamaria Intl-Ontario flights.
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From San José Juan Santamaria Intl to Ontario
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One-way flight from San José Juan Santamaria Intl to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($52 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from San José to Ontario

Cheapest flights from San José to Ontario
Explore the most affordable flight options available from San José to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 13, 2025.

This United Airlines deal was found by Cheapflights users on 11/12. 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 12/168:45 amSJO - ONT
2 stops29h 32mUnited Airlines
Sun 2/16:00 amONT - SJO
1 stop12h 39mUnited Airlines
Deal found 11/12$267
This American Airlines deal was found by Cheapflights users on 11/12. 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.
Fri 12/122:56 pmSJO - ONT
1 stop24h 59mAmerican Airlines
Wed 4/226:43 amONT - SJO
1 stop14h 12mAmerican Airlines
Deal found 11/12$282
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Fri 12/58:45 amSJO - ONT
2 stops29h 47mUnited Airlines
Sat 4/41:33 pmONT - SJO
2 stops21h 48mUnited Airlines
Deal found 11/11$305
This Kissandfly.com deal was found by Cheapflights users on 11/13. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/229:40 amSJO - ONT
1 stop15h 11mLufthansa
Fri 11/286:09 amONT - SJO
1 stop12h 30mLufthansa
Deal found 11/13$316
This United Airlines deal was found by Cheapflights users on 11/12. 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.
Mon 12/159:40 amSJO - ONT
1 stop28h 37mUnited Airlines
Fri 2/66:00 amONT - SJO
1 stop12h 39mUnited Airlines
Deal found 11/12$321
This American Airlines deal was found by Cheapflights users on 11/11. 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.
Sat 11/156:22 amSJO - ONT
1 stop18h 07mAmerican Airlines
Sat 12/63:04 pmONT - SJO
2 stops20h 35mAmerican Airlines
Deal found 11/11$325
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Sat 11/152:20 pmSJO - ONT
1 stop9h 29mUnited Airlines
Mon 11/176:38 pmONT - SJO
1 stop11h 54mUnited Airlines
Deal found 11/11$343

Cheapflights Fare Finder

 
Customize your flight search to find flights from San José 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 November 13, 2025.
Use the filters below to find and compare flights from San José to Ontario that are best for you.

Fly from

San José

Fly to

Ontario

Route

Depart

Return

Price

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 1/22

9:40 am-10:53 pm

1 stop15h 13m

Ontario

Sun 2/1

6:00 am-8:32 am

1 stop24h 32m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 12/16

2:20 pm-9:49 pm

1 stop9h 29m

Ontario

Tue 2/3

6:00 am-8:32 am

1 stop24h 32m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 12/16

2:20 pm-12:17 pm

2 stops23h 57m

Ontario

Sat 2/7

1:53 pm-8:32 am

1 stop16h 39m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 2/4

8:45 am-10:53 pm

2 stops16h 08m

Ontario

Tue 2/10

6:00 am-8:32 am

1 stop24h 32m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 4/21

8:45 am-9:55 am

1 stop26h 10m

Ontario

Wed 4/29

1:33 pm-12:26 pm

2 stops21h 53m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Sat 1/24

6:30 am-9:58 pm

1 stop17h 28m

Ontario

Sat 1/31

6:00 am-6:16 pm

1 stop10h 16m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 1/22

6:30 am-8:58 pm

2 stops16h 28m

Ontario

Tue 1/27

1:53 pm-6:16 pm

2 stops26h 23m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Mon 2/2

9:40 am-5:43 pm

1 stop10h 03m

Ontario

Fri 2/20

6:00 am-8:39 pm

1 stop12h 39m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Sat 12/6

8:45 am-12:32 pm

2 stops29h 47m

Ontario

Mon 3/30

6:00 am-7:15 am

1 stop24h 15m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 11/20

8:45 am-10:51 pm

2 stops16h 06m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/13

Showing 1-10 of 20 results
1
2

Compare providers for flights from San José 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 José to Ontario in November.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 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 José-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San José-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San José-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San José-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 José-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 José to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from San José 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 José to Ontario

How far ahead should I book a flight from San José to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from San José to Ontario. Price data was last updated on November 7, 2025.

The best time to book flights from San José to Ontario is 3 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, February is the cheapest month in which you can book a flight from San José to Ontario (average of $175). Flying from San José to Ontario in June is currently the most expensive (average of $252). 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 SJO to ONT?

Find hourly flight availability from San José 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 November 13, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 58% on flights from San José to Ontario by exploring options for tickets in the afternoon.

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 November 13, 2025.
Peruse reviews from past customers who have flown with United Airlines from San José to Ontario to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,017 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,017 reviews
United Airlines
7.4
Good
9,017 reviews

Crew

8.1

Comfort

7.3

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

Find useful and relevant information for your journey from San José to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from San José to Ontario?

    Airlines like United Airlines fly from San José to Ontario in about 15h 13m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 2685 mi.

  • What is the cheapest airline to fly from San José to Ontario round-trip?

    Cheapflights users have booked flights from San José to Ontario round-trip from $267. United Airlines is priced at 40% lower than the current average price of a flight leaving 3 months from now.

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

    Yes. In addition to deals on San José to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San José to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San José to Ontario.

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

    Yes. Cheapflights offers flight deals from San José 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 José to Ontario?

    Currently, February is the cheapest month in which you can book a flight from San José to Ontario (average of $175). Flying from San José to Ontario in June is currently the most expensive (average of $252). 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

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Alternative routes for San José to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from San José to Ontario

Discover the top airline that operate flights from San José 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$267Average$420FlexibilityNo cancel feeOn-time69%

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