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$186+ 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 7/29. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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Cheapflights Tip: The best prices from San José Juan Santamaria Intl to Ontario are usually found in September or May, 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 June 30, 2025.

Round-trip from

$324
(United Airlines)

One-way from

$186
(United Airlines)

Popular in

February

Cheapest in

September

Average price

$499
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. 5% potential increase in price ($29 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 30, 2025.

This United Airlines deal was found by Cheapflights users on 6/29. 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 11/49:40 amSJO - ONT
1 stop9h 54mUnited Airlines
Tue 11/111:40 pmONT - SJO
1 stop16h 52mUnited Airlines
Deal found 6/29$318
This American Airlines deal was found by Cheapflights users on 6/30. 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 7/1511:59 pmSJO - ONT
1 stop12h 57mAmerican Airlines
Thu 7/2412:59 amONT - SJO
1 stop20h 06mAmerican Airlines
Deal found 6/30$341
This Delta deal was found by Cheapflights users on 6/29. 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.
Fri 9/261:35 pmSJO - ONT
1 stop9h 48mDelta
Sat 10/49:50 amONT - SJO
2 stops25h 18mDelta
Deal found 6/29$354
This Kissandfly.com deal was found by Cheapflights users on 6/28. 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.
Thu 8/148:45 amSJO - ONT
1 stop9h 58mLufthansa
Fri 8/221:42 pmONT - SJO
1 stop16h 33mLufthansa
Deal found 6/28$361
This CheapOair deal was found by Cheapflights users on 6/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/224:13 pmSJO - ONT
1 stop8h 59mMultiple Airlines
Sun 12/281:02 amONT - SJO
1 stop20h 51mMultiple Airlines
Deal found 6/28$392
This Cheapflightsfares deal was found by Cheapflights users on 6/30. 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.
Sun 8/243:05 pmSJO - ONT
1 stop7h 50mAvianca
Sat 8/3011:25 pmONT - SJO
1 stop13h 05mAvianca
Deal found 6/30$453

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 June 30, 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

Tue 9/23

7:55 am-8:43 pm

2 stops13h 48m

Ontario

Mon 10/6

6:36 pm-7:15 am

1 stop11h 39m

$324

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 7/23

11:59 pm-11:54 pm

1 stop24h 55m

Ontario

Mon 8/18

11:59 pm-6:15 pm

1 stop17h 16m

$339

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 9/26

1:35 pm-12:17 pm

2 stops23h 42m

Ontario

Tue 10/7

10:59 pm-11:48 am

1 stop11h 49m

$354

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 8/14

8:45 am-5:43 pm

1 stop9h 58m

Ontario

Fri 8/22

1:42 pm-7:15 am

1 stop16h 33m

$361

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Sun 8/24

3:05 pm-9:55 pm

1 stop7h 50m

Ontario

Sat 8/30

11:25 pm-1:30 pm

1 stop13h 05m

$453

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 7/29

7:55 am-10:52 pm

2 stops15h 57m

$186

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 8/6

1:55 pm-9:59 am

2 stops21h 04m

$200

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 8/5

11:24 am-11:50 pm

3 stops37h 26m

$246

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 9/2

3:05 pm-9:55 pm

1 stop7h 50m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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 June 27, 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 June 30, 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.

How much does it cost to fly round-trip from San José, San José Province 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 June 30, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American 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.
Delta
8.0
Very good
7,973 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,973 reviews
Delta
8.0
Very good
7,973 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,852 reviews
Delta
8.0
Very good
7,973 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,973 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Lufthansa
6.8
Okay
7,200 reviews
Delta
8.0
Very good
7,973 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Avianca
6.7
Okay
2,359 reviews
Delta
8.0
Very good
7,973 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 are the cheapest airlines flying 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. Search Cheapflights for deals from American Airlines and Delta - these airlines can fly you to your destination from $343 and $354, respectively. United Airlines is priced at 33% lower than the current average price of a flight leaving 3 months from now.

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

    $186 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on American Airlines and Avianca, with prices starting from $200 and $249, 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, 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$324Average$465FlexibilityNo cancel feeOn-time69%

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