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$159+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$318
(CheapOair)

One-way from

$159
(CheapOair)

Popular in

February

Cheapest in

September

Average price

$387
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 ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 1, 2025.

This CheapOair deal was found by Cheapflights users on 4/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/203:31 pmSJO - ONT
1 stop8h 42mMultiple Airlines
Mon 5/261:09 amONT - SJO
1 stop21h 05mMultiple Airlines
Deal found 4/30$318
This United Airlines deal was found by Cheapflights users on 4/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/87:55 amSJO - ONT
2 stops29h 29mUnited Airlines
Tue 5/131:45 pmONT - SJO
2 stops28h 52mUnited Airlines
Deal found 4/30$321
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/241:13 pmSJO - ONT
1 stop10h 28mDelta
Sat 10/2510:59 pmONT - SJO
1 stop11h 49mDelta
Deal found 4/30$332
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 8/132:35 pmSJO - ONT
2 stops20h 24mAmerican Airlines
Sat 8/166:10 amONT - SJO
2 stops13h 04mAmerican Airlines
Deal found 4/30$338
This Avianca deal was found by Cheapflights users on 4/30. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/229:35 amSJO - ONT
1 stop13h 20mAvianca
Tue 6/2411:25 pmONT - SJO
1 stop18h 20mAvianca
Deal found 4/30$417

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 May 1, 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 5/20

3:31 pm-11:13 pm

1 stop8h 42m

Ontario

Mon 5/26

1:09 am-11:14 pm

1 stop21h 05m

$318

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 5/21

1:30 pm-12:31 pm

2 stops24h 01m

Ontario

Sat 5/24

6:00 am-10:11 am

1 stop27h 11m

$321

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 10/24

1:13 pm-10:41 pm

1 stop10h 28m

Ontario

Sat 10/25

10:59 pm-11:48 am

1 stop11h 49m

$332

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 8/13

2:35 pm-9:59 am

2 stops20h 24m

Ontario

Sat 8/16

6:10 am-8:14 pm

2 stops13h 04m

$338

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 5/22

9:35 am-9:55 pm

1 stop13h 20m

Ontario

Tue 6/24

11:25 pm-6:45 pm

1 stop18h 20m

$417

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 5/20

3:31 pm-11:13 pm

1 stop8h 42m

$159

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 5/13

7:55 am-10:00 pm

1 stop15h 05m

$184

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 5/8

1:50 pm-11:50 am

1 stop23h 00m

$192

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Sun 6/1

3:05 pm-9:55 pm

1 stop7h 50m

$280

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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 May.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*2 stars
ExpediaPrice Accuracy1 starTrust 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, San José Province-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, San José Province-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San José, San José Province-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San José, San José Province-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, San José Province-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, 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 April 25, 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 May 1, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 May 1, 2025.
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

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
7,934 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

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
8,696 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

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
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

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
2,317 reviews
Delta
8.0
Very good
7,934 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

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 $321, 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 Avianca and American Airlines - these airlines can fly you to your destination from $417 and $496, respectively. United Airlines is priced at 36% 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?

    $184 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 $192 and $280, 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.

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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 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$328Average$439FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$408Average$596FlexibilityNo cancel feeOn-time71%

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