HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$174+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
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.

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 February 13, 2026.

This United Airlines deal was found by Cheapflights users on 2/10. 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 3/1111:35 am
SJO
-
ONT
1 stop12h 01m
United Airlines
Sat 4/111:27 pm
ONT
-
SJO
1 stop16h 48m
United Airlines
Deal found 2/10$300
This United Airlines deal was found by Cheapflights users on 2/11. 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 2/268:45 am
SJO
-
ONT
1 stop15h 14m
United Airlines
Mon 3/26:37 pm
ONT
-
SJO
1 stop11h 55m
United Airlines
Deal found 2/11$309
This United Airlines deal was found by Cheapflights users on 2/12. 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 5/17:55 am
SJO
-
ONT
2 stops26h 46m
United Airlines
Fri 5/295:55 am
ONT
-
SJO
1 stop15h 44m
United Airlines
Deal found 2/12$312
This United Airlines deal was found by Cheapflights users on 2/11. 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 5/18:45 am
SJO
-
ONT
1 stop15h 14m
United Airlines
Fri 5/1510:37 am
ONT
-
SJO
1 stop19h 38m
United Airlines
Deal found 2/11$321
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/58:45 am
SJO
-
ONT
1 stop15h 51m
United Airlines
Mon 3/166:37 pm
ONT
-
SJO
1 stop11h 55m
United Airlines
Deal found 2/11$323
This United Airlines deal was found by Cheapflights users on 2/12. 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 3/115:30 am
SJO
-
ONT
2 stops13h 11m
United Airlines
Fri 4/101:43 pm
ONT
-
SJO
2 stops19h 28m
United Airlines
Deal found 2/12$328
This Kissandfly.com deal was found by Cheapflights users on 2/10. 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 2/2612:35 pm
SJO
-
ONT
1 stop11h 24m
Lufthansa
Mon 3/21:50 pm
ONT
-
SJO
1 stop16h 42m
Lufthansa
Deal found 2/10$332
This United Airlines deal was found by Cheapflights users on 2/9. 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 2/268:45 am
SJO
-
ONT
1 stop15h 14m
United Airlines
Sat 2/281:53 pm
ONT
-
SJO
1 stop16h 39m
United Airlines
Deal found 2/9$337
This United Airlines deal was found by Cheapflights users on 2/10. 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 5/78:45 am
SJO
-
ONT
1 stop10h 07m
United Airlines
Sun 5/106:00 am
ONT
-
SJO
1 stop24h 15m
United Airlines
Deal found 2/10$339

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 February 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$300
(United Airlines)

One-way from

$174
(United Airlines)

Popular in

April

Cheapest in

January

Average price

$405
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. 11% potential increase in price ($53 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 13, 2026.
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

Wed 3/11

5:30 am-10:36 pm

1 stop18h 06m

Ontario

Fri 4/10

1:43 pm-10:11 am

2 stops19h 28m

$300

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Mon 3/9

8:40 am-12:18 pm

1 stop28h 38m

Ontario

Thu 4/9

1:34 pm-12:21 pm

2 stops21h 47m

$300

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 3/11

5:30 am-10:36 pm

1 stop18h 06m

Ontario

Fri 4/24

1:43 pm-12:21 pm

2 stops21h 38m

$300

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 3/12

8:40 am-10:57 pm

1 stop15h 17m

Ontario

Thu 4/9

6:49 pm-7:15 am

1 stop11h 26m

$312

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 3/18

5:30 am-10:36 pm

1 stop18h 06m

Ontario

Tue 4/7

1:27 pm-12:21 pm

2 stops21h 54m

$312

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Thu 4/30

7:55 am-9:58 pm

1 stop15h 03m

Ontario

Thu 5/28

1:33 pm-7:15 am

1 stop16h 42m

$312

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 5/19

8:45 am-5:52 pm

1 stop10h 07m

Ontario

Tue 6/2

1:33 pm-7:15 am

1 stop16h 42m

$312

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Sun 7/26

12:30 am-10:34 pm

2 stops23h 04m

Ontario

Thu 7/30

1:33 pm-10:11 am

2 stops19h 38m

$312

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Tue 4/28

8:45 am-6:02 pm

1 stop10h 17m

Ontario

Fri 5/29

5:55 am-10:39 pm

1 stop15h 44m

$312

San JoséOntario

SJO - ONT

SJOONT

San José Juan Santamaria Intl

Wed 3/18

8:40 am-10:57 pm

1 stop15h 17m

Ontario

Fri 4/24

6:45 pm-7:15 am

1 stop11h 30m

$312

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Showing 1-10 of 19 results
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 February.
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?

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 February 6, 2026.

The best time to book flights from San José to Ontario is 6 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, February is the cheapest month in which you can book a flight from San José to Ontario (average of $167). Flying from San José to Ontario in June is currently the most expensive (average of $257). 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?

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 February 13, 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
9,285 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

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
9,285 reviews
United Airlines
7.4
Good
9,285 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

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
2,495 reviews
United Airlines
7.4
Good
9,285 reviews

Boarding

7.7

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

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 18h 06m. 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 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 to Ontario?

    Currently, February is the cheapest month in which you can book a flight from San José to Ontario (average of $167). Flying from San José to Ontario in June is currently the most expensive (average of $257). 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.

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 February 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$267Average$388FlexibilityNo cancel feeOn-time69%
AviancaCheapest$361Average$430FlexibilityNo cancel feeOn-time71%

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.
Site
Cookie settings©2026 Cheapflights