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$158+ 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 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Feb 11 — Feb 181
Wed 2/11
Wed 2/18
1 adult, Economy
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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 January 12, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$269
(United Airlines)

One-way from

$158
(United Airlines)

Popular in

April

Cheapest in

October

Average price

$459
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. 2% potential increase in price ($9 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 12, 2026.

This United Airlines deal was found by Cheapflights users on 1/12. 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.
Fri 1/236:30 am
SJO
-
ONT
2 stops18h 23m
United Airlines
Sun 1/256:39 pm
ONT
-
SJO
1 stop11h 53m
United Airlines
Deal found 1/12$269
This United Airlines deal was found by Cheapflights users on 1/12. 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.
Sun 5/178:45 am
SJO
-
ONT
1 stop15h 07m
United Airlines
Thu 5/286:53 pm
ONT
-
SJO
1 stop11h 22m
United Airlines
Deal found 1/12$280
This United Airlines deal was found by Cheapflights users on 1/11. 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 5/17:55 am
SJO
-
ONT
1 stop14h 55m
United Airlines
Fri 5/1511:05 am
ONT
-
SJO
1 stop19h 10m
United Airlines
Deal found 1/11$289
This United Airlines deal was found by Cheapflights users on 1/12. 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.
Sun 2/16:30 am
SJO
-
ONT
1 stop17h 28m
United Airlines
Tue 2/31:53 pm
ONT
-
SJO
2 stops21h 22m
United Airlines
Deal found 1/12$290
This KAYAK deal was found by Cheapflights users on 1/12. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/168:40 am
SJO
-
ONT
1 stop10h 01m
Multiple Airlines
Thu 4/166:49 pm
ONT
-
SJO
1 stop11h 26m
Multiple Airlines
Deal found 1/12$294
This United Airlines deal was found by Cheapflights users on 1/12. 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.
Wed 3/188:40 am
SJO
-
ONT
1 stop15h 17m
United Airlines
Tue 3/2411:59 pm
ONT
-
SJO
1 stop10h 57m
United Airlines
Deal found 1/12$301
This United Airlines deal was found by Cheapflights users on 1/12. 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.
Sat 1/178:45 am
SJO
-
ONT
1 stop15h 13m
United Airlines
Sun 4/196:00 am
ONT
-
SJO
1 stop27h 11m
United Airlines
Deal found 1/12$307
This KAYAK deal was found by Cheapflights users on 1/12. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/188:40 am
SJO
-
ONT
1 stop15h 17m
Multiple Airlines
Tue 3/2411:59 pm
ONT
-
SJO
1 stop10h 57m
Multiple Airlines
Deal found 1/12$314
This United Airlines deal was found by Cheapflights users on 1/11. 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.
Thu 2/2612:35 pm
SJO
-
ONT
1 stop11h 24m
United Airlines
Sat 2/281:53 pm
ONT
-
SJO
1 stop16h 39m
United Airlines
Deal found 1/11$316
This KAYAK deal was found by Cheapflights users on 1/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2612:35 pm
SJO
-
ONT
1 stop11h 24m
Multiple Airlines
Mon 3/26:00 am
ONT
-
SJO
1 stop12h 39m
Multiple Airlines
Deal found 1/11$320
This American Airlines deal was found by Cheapflights users on 1/12. 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.
Sun 8/232:15 pm
SJO
-
ONT
2 stops20h 44m
American Airlines
Sun 8/307:02 pm
ONT
-
SJO
2 stops15h 48m
American Airlines
Deal found 1/12$326

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 January 12, 2026.
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

Wed 1/28

6:30 am-9:58 pm

1 stop17h 28m

Ontario

Mon 3/23

11:59 pm-11:56 am

1 stop10h 57m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 1/29

6:30 am-10:53 pm

2 stops18h 23m

Ontario

Wed 2/4

6:00 am-8:32 am

1 stop24h 32m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 1/23

6:30 am-9:58 pm

1 stop17h 28m

Ontario

Mon 2/2

6:00 am-8:32 am

1 stop24h 32m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 1/22

9:40 am-11:18 am

1 stop27h 38m

Ontario

Mon 1/26

6:00 am-8:32 am

1 stop24h 32m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 1/29

2:20 pm-9:58 pm

1 stop9h 38m

Ontario

Thu 2/5

6:39 pm-8:32 am

1 stop11h 53m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 2/5

2:20 pm-11:18 am

2 stops22h 58m

Ontario

Mon 2/9

1:53 pm-8:32 am

1 stop16h 39m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 1/22

2:05 pm-12:47 pm

2 stops48h 42m

Ontario

Sun 1/25

6:39 pm-12:56 pm

2 stops16h 17m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 1/23

6:30 am-10:53 pm

2 stops18h 23m

Ontario

Thu 1/29

6:00 am-8:32 am

1 stop24h 32m

$269

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 3/17

5:30 am-10:57 pm

2 stops18h 27m

Ontario

Sun 3/22

6:15 am-7:32 am

1 stop24h 17m

$280

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 4/30

7:55 am-9:50 pm

1 stop14h 55m

Ontario

Tue 5/5

6:00 am-7:15 am

1 stop24h 15m

$280

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/10

Showing 1-10 of 19 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 January.
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 January 9, 2026.

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 $147). 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.

How much does it cost to fly round-trip from San José to Ontario?

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 January 12, 2026.
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
9,143 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Entertainment

7.1

Overall

7.4

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
9,143 reviews
United Airlines
7.4
Good
9,143 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

Entertainment

7.1

Overall

7.4

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 17h 28m. 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 37% lower than the current average price of a flight leaving 3 months from now.

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

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $130. Users have also found prices from $162 and $273 on American Airlines and Avianca, respectively.

  • 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 $147). 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 January 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$267Average$388FlexibilityNo cancel feeOn-time69%

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