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Ontario

$274+ 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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Sep 14 — Sep 211
Mon 9/14
Mon 9/21
1 adult, Economy
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Cheap 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 August 15, 2026.

This United Airlines deal was found by Cheapflights users on 8/11. 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 10/17:55 am -
2 stops15h 56m
Wed 10/78:03 am -
2 stops27h 18m
Deal found 8/11$489
This United Airlines deal was found by Cheapflights users on 8/11. 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 9/38:45 am -
1 stop12h 16m
Wed 9/161:56 pm -
1 stop16h 19m
Deal found 8/11$500
This American Airlines deal was found by Cheapflights users on 8/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:00 am -
2 stops17h 53m
Tue 10/131:05 pm -
2 stops21h 55m
Deal found 8/13$502
This American Airlines deal was found by Cheapflights users on 8/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/201:00 pm -
1 stop11h 52m
Sat 11/142:22 pm -
1 stop21h 24m
Deal found 8/13$509
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/227:55 am -
1 stop15h 04m
Mon 11/161:35 pm -
2 stops21h 47m
Deal found 8/13$510
This American Airlines deal was found by Cheapflights users on 8/11. 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.
Thu 9/242:57 pm -
2 stops19h 32m
Mon 9/2810:25 am -
2 stops25h 34m
Deal found 8/11$511
This United Airlines deal was found by Cheapflights users on 8/11. 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 9/48:45 am -
1 stop31h 56m
Thu 9/246:06 am -
1 stop24h 09m
Deal found 8/11$512
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/71:25 pm -
1 stop9h 34m
Tue 10/136:00 am -
1 stop12h 37m
Deal found 8/13$519
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:45 am -
1 stop26h 38m
Mon 9/281:52 pm -
2 stops21h 29m
Deal found 8/13$521
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/278:40 am -
1 stop12h 35m
Fri 10/306:00 am -
1 stop12h 39m
Deal found 8/13$530
This United Airlines deal was found by Cheapflights users on 8/11. 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 10/38:45 am -
1 stop10h 01m
Thu 10/86:00 am -
1 stop12h 37m
Deal found 8/11$533

Find 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 August 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$489
(United Airlines)

One-way from

$274
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$396
Provider with most accurate pricing for San José Juan Santamaria Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for San José Juan Santamaria Intl-Ontario flights.
Search Deals
From San José Juan Santamaria Intl to Ontario
Search Deals
One-way flight from San José Juan Santamaria Intl to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($63 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

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 August 15, 2026.
Use the filters below to find and compare flights from San José to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Fri 10/9

8:45 am-10:23 am

1 stop26h 38m

Ontario

Sun 10/18

6:07 am-7:15 am

1 stop24h 08m

$489

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Fri 10/2

8:45 am-10:23 am

1 stop26h 38m

Ontario

Sun 10/11

9:25 am-7:15 am

1 stop20h 50m

$489

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Wed 10/7

7:55 am-9:59 pm

1 stop15h 04m

Ontario

Wed 10/28

1:35 pm-7:32 am

1 stop16h 57m

$489

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Fri 12/4

8:45 am-9:57 am

2 stops27h 12m

Ontario

Mon 12/7

1:33 pm-1:15 pm

2 stops21h 42m

$489
Quickest round-trip

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Tue 1/19

1:15 am-12:20 pm

2 stops13h 05m

Ontario

Sat 5/1

6:53 pm-12:21 pm

2 stops16h 28m

$500

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Mon 9/21

7:55 am-12:50 pm

2 stops29h 55m

Ontario

Sun 9/27

11:10 am-7:15 am

1 stop19h 05m

$521

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Sun 11/1

8:45 am-10:48 pm

2 stops16h 03m

Ontario

Sat 11/7

4:17 pm-8:32 am

1 stop14h 15m

$533

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Mon 10/5

7:55 am-10:51 pm

2 stops15h 56m

Ontario

Sat 10/17

11:10 am-12:21 pm

2 stops24h 11m

$533

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Sat 9/19

1:25 pm-6:11 pm

2 stops29h 46m

Ontario

Sun 10/4

11:10 am-12:21 pm

2 stops24h 11m

$533

San JoséOntario

SJO San José Juan Santamaria Intl - ONT Ontario

SJOONT

San José Juan Santamaria Intl

Wed 11/18

8:45 am-8:15 pm

2 stops13h 30m

Ontario

Thu 12/3

1:33 pm-1:15 pm

2 stops21h 42m

$533

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/10

Showing 1-10 of 20 resultsSorted by cheapest first
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 August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San José-Ontario flight deals on Cheapflights vs. FlightHub >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 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 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?

The best time to book flights from San José to Ontario is 5 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, January is the cheapest month in which you can book a flight from San José to Ontario (average of $327). Flying from San José to Ontario in June is currently the most expensive (average of $617). 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?

Airfare is above average for this route at the moment.

San José to Ontario flights typically cost between $286 and $396 in October.
The cheapest round-trip price found within the last 5 days was $489 on United Airlines (Oct 1-Oct 4).

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 August 15, 2026.
Peruse reviews from past customers who have flown with United Airlines and Avianca 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
10,105 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.7

Crew

8.1

Entertainment

7.1

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
10,105 reviews
United Airlines
7.4
Good
10,105 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Avianca
6.5
Okay
2,539 reviews
United Airlines
7.4
Good
10,105 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.7

Crew

8.1

Entertainment

7.1

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 26h 38m. 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 are the cheapest airlines flying from San José to Ontario round-trip?

    Cheapflights users have booked flights from San José to Ontario round-trip from $267. Another airline that can offer you cheap pricing is Avianca. United Airlines is priced at 41% 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 $158. Users have also found prices from $162 and $240 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, January is the cheapest month in which you can book a flight from San José to Ontario (average of $327). Flying from San José to Ontario in June is currently the most expensive (average of $617). 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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Top 2 airlines flying from San José to Ontario

Discover the top 2 airlines 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 August 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$267Average$388FlexibilityNo cancel feeOn-time69%
AviancaCheapest$361Average$430FlexibilityNo cancel feeOn-time71%

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