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$152+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from San José Juan Santamaria Intl to Ontario are usually found in May or September, booked 89 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 agosto 14, 2025.

Round-trip from

$265
(Avianca)

One-way from

$152
(Cheapflightsfares)

Popular in

October

Cheapest in

May

Average price

$394
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. 7% potential increase in price ($40 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 14, 2025.

This Avianca deal was found by Cheapflights users on 8/14. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/289:35 amSJO - ONT
1 stop13h 20mAvianca
sáb. 9/1311:25 pmONT - SJO
1 stop18h 20mAvianca
Deal found 8/14$265
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.
mié. 10/226:44 amSJO - ONT
1 stop13h 19mAmerican Airlines
mié. 11/53:08 pmONT - SJO
2 stops19h 14mAmerican Airlines
Deal found 8/13$281
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.
mar. 10/216:44 amSJO - ONT
1 stop28h 23mAmerican Airlines
mar. 11/410:34 pmONT - SJO
1 stop11h 45mAmerican Airlines
Deal found 8/13$282
This American Airlines deal was found by Cheapflights users on 8/14. 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.
sáb. 9/131:45 pmSJO - ONT
2 stops21h 20mAmerican Airlines
mar. 9/2310:35 pmONT - SJO
2 stops20h 07mAmerican Airlines
Deal found 8/14$287
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/113:05 pmSJO - ONT
1 stop7h 50mAvianca
jue. 9/1811:25 pmONT - SJO
1 stop13h 05mAvianca
Deal found 8/14$310
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.
vie. 8/151:00 pmSJO - ONT
2 stops21h 58mAmerican Airlines
lun. 8/2511:59 pmONT - SJO
2 stops10h 56mAmerican Airlines
Deal found 8/13$341
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.
mié. 8/137:25 amSJO - ONT
1 stop27h 34mAmerican Airlines
vie. 8/2211:59 pmONT - SJO
2 stops19h 16mAmerican Airlines
Deal found 8/13$348
This Delta deal was found by Cheapflights users on 8/14. 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.
mar. 11/112:17 pmSJO - ONT
1 stop10h 24mDelta
jue. 11/277:00 amONT - SJO
1 stop13h 15mDelta
Deal found 8/14$354
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/29:35 amSJO - ONT
1 stop13h 20mAvianca
mar. 9/911:25 pmONT - SJO
1 stop10h 50mAvianca
Deal found 8/14$358
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/303:05 pmSJO - ONT
1 stop7h 50mAvianca
sáb. 9/1311:25 pmONT - SJO
1 stop10h 50mAvianca
Deal found 8/13$362

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 agosto 14, 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

jue. 8/28

9:35 am-9:55 pm

1 stop13h 20m

Ontario

sáb. 9/13

11:25 pm-6:45 pm

1 stop18h 20m

$265

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

mié. 10/22

6:44 am-7:03 pm

1 stop13h 19m

Ontario

mié. 11/5

3:08 pm-12:22 pm

2 stops19h 14m

$281

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

mar. 10/21

6:44 am-10:07 am

1 stop28h 23m

Ontario

mar. 11/4

10:34 pm-12:19 pm

1 stop11h 45m

$282

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

sáb. 9/13

1:45 pm-10:05 am

2 stops21h 20m

Ontario

mar. 9/23

10:35 pm-7:42 pm

2 stops20h 07m

$287

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

jue. 9/11

3:05 pm-9:55 pm

1 stop7h 50m

Ontario

jue. 9/18

11:25 pm-1:30 pm

1 stop13h 05m

$310

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

jue. 8/28

3:05 pm-9:55 pm

1 stop7h 50m

Ontario

sáb. 9/13

1:37 pm-11:14 am

2 stops20h 37m

$341

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

mié. 9/17

6:00 am-9:24 pm

2 stops16h 24m

Ontario

mié. 9/24

10:35 pm-7:42 pm

2 stops20h 07m

$341

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

jue. 9/25

9:35 am-9:55 pm

1 stop13h 20m

$152

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

mar. 9/23

7:27 am-10:33 pm

1 stop16h 06m

$162

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

mar. 10/21

6:44 am-10:07 am

1 stop28h 23m

$165

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 14 results
1
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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, San José Province 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 August 8, 2025.

To ensure you get the cheapest price possible for a flight from San José, San José Province to Ontario, you should look to book at least 89 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 José, San José Province to Ontario?

Currently, August is the cheapest month in which you can book a flight from San José, San José Province to Ontario (average of $246). Flying from San José, San José Province 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 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 agosto 14, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 59% on flights from San José, San José Province 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 agosto 14, 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
8,916 reviews

Crew

8.1

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
United Airlines
7.4
Good
8,916 reviews
United Airlines
7.4
Good
8,916 reviews

Crew

8.1

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.

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.

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

    Currently priced at $324, United Airlines will fly you from San José, San José Province to Ontario and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. United Airlines is priced at 34% 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, San José Province to Ontario?

    Currently, August is the cheapest month in which you can book a flight from San José, San José Province to Ontario (average of $246). Flying from San José, San José Province 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

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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 agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$324Average$439FlexibilityNo cancel feeOn-time69%

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