$308+ Cheap flights from San José (SJO) to Ontario (ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
SJO — ONT
Oct 27 — Nov 31
Round-trip
1 adult, Economy
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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
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Cheapest flights from San José to OntarioExplore 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 September 27, 2026.
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 September 27, 2026.
This American Airlines deal was found by Cheapflights users on 9/27. 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.
Fri 10/233:01 pm -
2 stops19h 09m
Tue 11/32:22 pm -
2 stops20h 39m
Deal found 9/27![American Airlines logo]()
$449
This Avianca deal was found by Cheapflights users on 9/25. 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.
Sat 10/179:40 am -
1 stop13h 05m
Sat 10/2411:35 pm -
1 stop8h 15m
Deal found 9/25![Avianca logo]()
$529
This Avianca deal was found by Cheapflights users on 9/22. 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.
Sat 10/33:10 pm -
1 stop7h 35m
Sat 10/1011:35 pm -
1 stop8h 10m
Deal found 9/22![Avianca logo]()
$530
This Avianca deal was found by Cheapflights users on 9/23. 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.
Tue 10/139:40 am -
1 stop13h 05m
Tue 10/2711:45 pm -
1 stop10h 40m
Deal found 9/23![Avianca logo]()
$531
This Avianca deal was found by Cheapflights users on 9/26. 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.
Sat 10/243:10 pm -
1 stop7h 35m
Sat 10/3111:45 pm -
1 stop8h 05m
Deal found 9/26![Avianca logo]()
$532
This United Airlines deal was found by Cheapflights users on 9/22. 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 12/248:45 am -
1 stop15h 26m
Sun 1/106:00 am -
1 stop24h 32m
Deal found 9/22![United Airlines logo]()
$533
This Avianca deal was found by Cheapflights users on 9/23. 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 12/243:10 pm -
1 stop7h 40m
Thu 1/710:45 pm -
1 stop8h 05m
Deal found 9/23![Avianca logo]()
$537
This Avianca deal was found by Cheapflights users on 9/23. 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.
Tue 10/65:05 am -
1 stop17h 40m
Tue 10/1311:35 pm -
1 stop10h 55m
Deal found 9/23![Avianca logo]()
$540
This Southwest deal was found by Cheapflights users on 9/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/62:10 pm -
2 stops20h 40m
Mon 11/165:00 pm -
2 stops17h 20m
Deal found 9/22![Southwest logo]()
$542
This Avianca deal was found by Cheapflights users on 9/22. 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 11/263:10 pm -
1 stop7h 40m
Tue 12/110:45 pm -
1 stop8h 05m
Deal found 9/22![Avianca logo]()
$544
This Super.com deal was found by Cheapflights users on 9/26. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/97:45 pm -
1 stop27h 05m
Thu 11/1210:45 pm -
1 stop10h 40m
Deal found 9/26![Avianca logo]()
$548
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/62:25 pm -
1 stop9h 15m
Wed 11/186:00 am -
1 stop12h 39m
Deal found 9/23![United Airlines logo]()
$554
Best flights from San José to OntarioDiscover carefully curated flight deals from San José to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 27, 2026.
Discover carefully curated flight deals from San José to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 27, 2026.
This United Airlines deal was found by Cheapflights users on 9/22. 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.
Sat 12/52:25 pm -
2 stops21h 48m
Sun 2/281:33 pm -
2 stops21h 49m
Deal found 9/22![United Airlines logo]()
$554
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/59:40 am -
1 stop10h 16m
Wed 11/186:00 am -
1 stop12h 39m
Deal found 9/23![United Airlines logo]()
$554
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Mon 10/2611:35 am -
2 stops25h 54m
Sat 10/311:35 pm -
2 stops20h 50m
Deal found 9/23![United Airlines logo]()
$575
This United Airlines deal was found by Cheapflights users on 9/24. 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 10/18:45 am -
1 stop28h 33m
Sun 10/46:07 am -
1 stop24h 08m
Deal found 9/24![United Airlines logo]()
$575
This United Airlines deal was found by Cheapflights users on 9/24. 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 10/298:40 am -
1 stop15h 08m
Wed 11/46:00 am -
1 stop27h 25m
Deal found 9/24![United Airlines logo]()
$575
This United Airlines deal was found by Cheapflights users on 9/22. 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 10/18:45 am -
1 stop15h 06m
Sun 10/116:07 am -
1 stop24h 08m
Deal found 9/22![United Airlines logo]()
$575
This United Airlines deal was found by Cheapflights users on 9/21. 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 10/227:55 am -
2 stops29h 23m
Sun 10/255:00 am -
2 stops28h 25m
Deal found 9/21![United Airlines logo]()
$589
This United Airlines deal was found by Cheapflights users on 9/26. 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 11/1912:35 pm -
1 stop11h 05m
Wed 11/256:00 am -
1 stop12h 39m
Deal found 9/26![United Airlines logo]()
$633
This United Airlines deal was found by Cheapflights users on 9/24. 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 11/49:40 am -
1 stop12h 35m
Tue 11/174:17 pm -
2 stops26h 22m
Deal found 9/24![United Airlines logo]()
$633
This United Airlines deal was found by Cheapflights users on 9/26. 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 11/188:45 am -
2 stops13h 30m
Tue 11/241:29 pm -
2 stops29h 10m
Deal found 9/26![United Airlines logo]()
$633
This United Airlines deal was found by Cheapflights users on 9/26. 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 11/1912:35 pm -
2 stops25h 54m
Tue 11/241:35 pm -
1 stop16h 57m
Deal found 9/26![United Airlines logo]()
$647
Last-minute flights from San José to OntarioDiscover last-minute flight deals from San José to Ontario. Data last updated September 27, 2026 and is based on user searches.
Discover last-minute flight deals from San José to Ontario. Data last updated September 27, 2026 and is based on user searches.
This Avianca deal was found by Cheapflights users on 9/25. 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.
Sat 9/263:10 pm -
1 stop7h 35m
Sat 10/311:35 pm -
1 stop8h 10m
Deal found 9/25![Avianca logo]()
$544
This Gotogate deal was found by Cheapflights users on 9/26. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:45 pm -
1 stop27h 00m
Sat 10/1011:35 pm -
1 stop8h 10m
Deal found 9/26![Avianca logo]()
$560
This Mytrip deal was found by Cheapflights users on 9/22. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:45 pm -
1 stop27h 00m
Sat 10/1011:35 pm -
1 stop8h 10m
Deal found 9/22![Avianca logo]()
$563
This United Airlines deal was found by Cheapflights users on 9/24. 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 10/17:55 am -
2 stops29h 51m
Sun 10/41:52 pm -
1 stop16h 23m
Deal found 9/24![United Airlines logo]()
$575
This Justfly.com deal was found by Cheapflights users on 9/24. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/27:45 pm -
1 stop27h 00m
Thu 10/811:35 pm -
1 stop10h 55m
Deal found 9/24![Avianca logo]()
$573
This Avianca deal was found by Cheapflights users on 9/22. 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.
Sat 10/33:10 pm -
1 stop7h 35m
Sat 10/1011:35 pm -
1 stop8h 10m
Deal found 9/22![Avianca logo]()
$530
This Justfly.com deal was found by Cheapflights users on 9/24. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/33:10 pm -
1 stop7h 35m
Tue 10/611:35 pm -
1 stop10h 55m
Deal found 9/24![Avianca logo]()
$556
This Avianca deal was found by Cheapflights users on 9/23. 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.
Tue 10/65:05 am -
1 stop17h 40m
Tue 10/1311:35 pm -
1 stop10h 55m
Deal found 9/23![Avianca logo]()
$540
This Avianca deal was found by Cheapflights users on 9/24. 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.
Tue 10/63:10 pm -
1 stop7h 35m
Thu 10/811:35 pm -
1 stop10h 55m
Deal found 9/24![Avianca logo]()
$581
This Avianca deal was found by Cheapflights users on 9/23. 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.
Tue 10/139:40 am -
1 stop13h 05m
Tue 10/2711:45 pm -
1 stop10h 40m
Deal found 9/23![Avianca logo]()
$531
This Avianca deal was found by Cheapflights users on 9/25. 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.
Sat 10/179:40 am -
1 stop13h 05m
Sat 10/2411:35 pm -
1 stop8h 15m
Deal found 9/25![Avianca logo]()
$529
This Avianca deal was found by Cheapflights users on 9/26. 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.
Sat 10/243:10 pm -
1 stop7h 35m
Sat 10/3111:45 pm -
1 stop8h 05m
Deal found 9/26![Avianca logo]()
$532
One-way flights from San José to OntarioSearch for one-way flight options from San José to Ontario. Find affordable one-way fares based on user searches. Data last updated September 27, 2026.
Search for one-way flight options from San José to Ontario. Find affordable one-way fares based on user searches. Data last updated September 27, 2026.
This Booking.com deal was found by Cheapflights users on 9/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/104:15 pm -
1 stop9h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Multiple Airlines logo]()
$308
This Southwest deal was found by Cheapflights users on 9/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/52:10 pm -
2 stops19h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Southwest logo]()
$309
This Southwest deal was found by Cheapflights users on 9/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/209:00 am -
2 stops13h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Southwest logo]()
$311
This United Airlines deal was found by Cheapflights users on 9/22. 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 11/128:45 am -
2 stops16h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![United Airlines logo]()
$323
This United Airlines deal was found by Cheapflights users on 9/25. 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.
Mon 12/211:15 am -
2 stops23h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![United Airlines logo]()
$328
This Southwest deal was found by Cheapflights users on 9/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:30 pm -
2 stops11h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Southwest logo]()
$338
This Cheapflightsfares deal was found by Cheapflights users on 9/23. 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.
Tue 12/294:15 pm -
1 stop9h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Multiple Airlines logo]()
$340
This Delta deal was found by Cheapflights users on 9/25. 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.
Thu 12/37:00 am -
1 stop16h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Delta logo]()
$355
This United Airlines deal was found by Cheapflights users on 9/23. 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 10/277:45 am -
2 stops14h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![United Airlines logo]()
$361
This American Airlines deal was found by Cheapflights users on 9/22. 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 10/206:00 am -
2 stops13h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![American Airlines logo]()
$363
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 September 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $529 (Avianca) |
One-way from | $308 (Booking.com) |
Popular in | August |
Cheapest in | May |
Average price | $566 |
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 7,457,451 searches. Data last updated September 27, 2026.
Use the filters below to find and compare flights from San José to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Fri 11/20
9:40 am-10:48 pm
1 stop15h 08m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$323
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Thu 12/3
2:25 pm-9:38 am
2 stops21h 13m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$323
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Fri 11/13
8:45 am-8:15 pm
2 stops13h 30m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$323
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Fri 1/29
9:40 am-9:47 am
1 stop26h 07m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$323
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Thu 11/12
7:00 am-9:57 pm
1 stop16h 57m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$361
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Thu 11/5
8:45 am-8:15 pm
2 stops13h 30m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$361
Quickest round-trip
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Tue 10/27
8:40 am-8:15 pm
1 stop12h 35m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$361
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Thu 10/22
7:55 am-12:46 pm
2 stops29h 51m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$361
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Sat 12/5
2:25 pm-10:13 am
2 stops21h 48m
Ontario
Sun 2/28
1:33 pm-1:22 pm
2 stops21h 49m
$554
San JoséOntario
SJO San José Juan Santamaria Intl - ONT Ontario
SJOONT
San José Juan Santamaria Intl
Thu 11/5
9:40 am-5:56 pm
1 stop10h 16m
Ontario
Wed 11/18
6:00 am-8:39 pm
1 stop12h 39m
$554
Showing 1-10 of 19 resultsSorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- 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.
SJO-ONT
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?
The best time to book flights from San José to Ontario is 76 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, May is the cheapest month in which you can book a flight from San José to Ontario (average of $383). Flying from San José to Ontario in August is currently the most expensive (average of $894). 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?
Airfare is typical for this route at the moment.
San José to Ontario flights typically cost between $409 and $594 in October.The cheapest round-trip price found within the last 5 days was $449 on American Airlines (Oct 23-Nov 3).
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 September 27, 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.
Boarding
7.7
Comfort
7.3
Overall
7.4
Food
6.7
Crew
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Boarding
7.7
Comfort
7.3
Overall
7.4
Food
6.7
Crew
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
Boarding
7.7
Comfort
7.3
Overall
7.4
Food
6.7
Crew
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Sep 2025
FRA - SFO
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.
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Alternative routes for San José to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
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Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 27, 2026.
San José and Ontario flights
Browse other San José and Ontario flight options. Last updated on September 27, 2026.
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Browse through other flights departing from San José. Flights are based on user searches made on Cheapflights and were last updated on September 27, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated September 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$267 | Average$448 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$387 | Average$503 | FlexibilityNo cancel fee | On-time71% |