HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Oct 31 — Nov 71
Fri 10/31
Fri 11/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San José to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 October 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$267
(United Airlines)

One-way from

$152
(Cheapflightsfares)

Popular in

November

Cheapest in

May

Average price

$625
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. 20% potential increase in price ($128 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 1, 2025.

This United Airlines deal was found by Cheapflights users on 10/1. 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 10/248:37 amSJO - ONT
1 stop15h 15mUnited Airlines
Fri 10/311:29 pmONT - SJO
2 stops19h 56mUnited Airlines
Deal found 10/1$267
This American Airlines deal was found by Cheapflights users on 9/30. 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.
Sat 11/152:59 pmSJO - ONT
1 stop20h 58mAmerican Airlines
Sat 12/610:34 pmONT - SJO
1 stop13h 28mAmerican Airlines
Deal found 9/30$281
This Cheapflightsfares deal was found by Cheapflights users on 10/1. 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.
Thu 10/99:35 amSJO - ONT
1 stop13h 20mAvianca
Thu 10/1611:25 pmONT - SJO
1 stop10h 50mAvianca
Deal found 10/1$323
This United Airlines deal was found by Cheapflights users on 9/30. 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.
Wed 12/178:45 amSJO - ONT
2 stops16h 04mUnited Airlines
Thu 1/86:39 pmONT - SJO
1 stop11h 53mUnited Airlines
Deal found 9/30$327
This United Airlines deal was found by Cheapflights users on 10/1. 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 12/178:45 amSJO - ONT
2 stops16h 04mUnited Airlines
Wed 12/3111:59 pmONT - SJO
1 stop10h 57mUnited Airlines
Deal found 10/1$328
This American Airlines deal was found by Cheapflights users on 9/30. 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.
Sat 11/12:40 pmSJO - ONT
2 stops20h 16mAmerican Airlines
Tue 11/1110:34 pmONT - SJO
1 stop11h 45mAmerican Airlines
Deal found 9/30$333
This American Airlines deal was found by Cheapflights users on 9/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/137:00 amSJO - ONT
2 stops16h 11mAmerican Airlines
Wed 11/193:08 pmONT - SJO
2 stops19h 03mAmerican Airlines
Deal found 9/29$347
This United Airlines deal was found by Cheapflights users on 10/1. 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 10/157:55 amSJO - ONT
2 stops15h 57mUnited Airlines
Fri 10/249:36 amONT - SJO
1 stop20h 39mUnited Airlines
Deal found 10/1$356
This American Airlines deal was found by Cheapflights users on 9/30. 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.
Thu 12/42:40 pmSJO - ONT
1 stop11h 15mAmerican Airlines
Sun 12/1410:34 pmONT - SJO
1 stop11h 18mAmerican Airlines
Deal found 9/30$371
This Delta deal was found by Cheapflights users on 9/30. 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 10/101:23 pmSJO - ONT
2 stops20h 42mDelta
Tue 11/186:00 amONT - SJO
2 stops14h 07mDelta
Deal found 9/30$375

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 October 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

Fri 10/24

1:30 pm-12:13 pm

2 stops23h 43m

Ontario

Fri 10/31

6:05 am-10:25 am

1 stop27h 20m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 10/31

1:20 pm-12:30 pm

2 stops24h 10m

Ontario

Tue 11/4

1:40 pm-8:32 am

1 stop16h 52m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 2/24

2:20 pm-9:59 pm

1 stop9h 39m

Ontario

Tue 3/3

6:00 am-8:39 pm

2 stops36h 39m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Fri 10/24

1:30 pm-12:13 pm

2 stops23h 43m

Ontario

Sat 11/1

5:05 am-11:25 am

2 stops29h 20m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 12/17

8:45 am-10:49 pm

2 stops16h 04m

Ontario

Sun 2/1

6:00 am-6:16 pm

1 stop10h 16m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 1/21

6:30 am-9:58 pm

1 stop17h 28m

Ontario

Wed 1/28

6:00 am-8:32 am

1 stop24h 32m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 2/24

2:20 pm-12:43 pm

2 stops24h 23m

Ontario

Sat 2/28

6:37 pm-8:32 am

1 stop11h 55m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 1/27

9:40 am-10:53 pm

1 stop15h 13m

Ontario

Tue 2/3

1:53 pm-6:16 pm

2 stops26h 23m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 2/24

2:20 pm-9:59 pm

1 stop9h 39m

Ontario

Mon 3/2

1:00 pm-1:15 pm

2 stops22h 15m

$267

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 12/17

8:45 am-10:49 pm

2 stops16h 04m

Ontario

Thu 1/29

6:39 pm-8:32 am

1 stop11h 53m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/30

Showing 1-10 of 23 results
1
2
3

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 October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
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, 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 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, 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 September 26, 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 $327). 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 October 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.

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 October 1, 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
8,929 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

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
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

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, San José Province to Ontario?

    United Airlines can get you from San José, San José Province to Ontario in just under 23h 43m. Your travel time can differ by up to . Airlines will cover a distance of 2685 mi.

  • 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 35% 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 $327). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San José to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
San José to Los Angeles flights
San José to Las Vegas flights
San José to San Francisco flights
San José to San Diego flights
Liberia to Los Angeles flights
San José to Oakland flights
San José to Sacramento flights
San José to San Jose flights
San José to Santa Ana flights
San José to Burbank flights
San José to Reno flights
Liberia to Ontario flights
Liberia to Las Vegas flights
Liberia to San Francisco flights
Liberia to Santa Ana flights
Liberia to San Jose flights
San José to Tijuana flights
San José to Long Beach flights
San José to Medford flights
Liberia to Sacramento flights
San José to Santa Rosa flights
Liberia to Reno flights
Liberia to San Diego flights
San José to Redding flights

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 October 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$324Average$420FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.