$58+ Cheap flights from San Jose, CA to Ontario (SJC - 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 12/22. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
Nov 29 — Dec 61
Round-trip
1 adult, Economy
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Find cheap flights from San Jose 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 Jose to Ontario are usually found in October or September, booked 12 days in advance, depart on a Thursday or Saturday and return on a Thursday
Cheap flight deals from San Jose to Ontario
Cheapest
Best
Last-minute
One-way
Cheapest flights from San Jose to OntarioExplore the most affordable flight options available from San Jose to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
Explore the most affordable flight options available from San Jose to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:30 am -
Nonstop1h 15m
Sat 11/216:00 am -
Nonstop1h 15m
Deal found 10/29![Southwest logo]()
$117
This Frontier deal was found by Cheapflights users on 10/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/225:59 pm -
1 stop3h 54m
Mon 1/1112:26 pm -
1 stop8h 38m
Deal found 10/27![Frontier logo]()
$118
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/215:59 pm -
1 stop14h 02m
Tue 12/2210:48 pm -
1 stop18h 16m
Deal found 10/29![Frontier logo]()
$125
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/162:41 pm -
1 stop18h 59m
Thu 11/198:35 pm -
1 stop18h 55m
Deal found 10/27![Frontier logo]()
$126
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:30 am -
Nonstop1h 15m
Mon 11/236:50 pm -
1 stop4h 00m
Deal found 10/28![Southwest logo]()
$127
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/264:15 pm -
1 stop15h 05m
Thu 12/38:00 am -
1 stop7h 07m
Deal found 10/27![Frontier logo]()
$128
This Mytrip deal was found by Cheapflights users on 10/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/33:52 pm -
1 stop21h 08m
Mon 12/78:44 am -
1 stop6h 19m
Deal found 10/29![Frontier logo]()
$129
This CheapOair deal was found by Cheapflights users on 10/28. 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.
Thu 12/175:59 pm -
1 stop3h 36m
Sat 1/93:33 pm -
1 stop20h 39m
Deal found 10/28![Frontier logo]()
$130
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:30 pm -
Nonstop1h 25m
Tue 12/13:50 pm -
2 stops6h 30m
Deal found 10/29![Southwest logo]()
$132
This Southwest deal was found by Cheapflights users on 10/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:10 am -
Nonstop1h 20m
Wed 11/259:35 pm -
1 stop10h 05m
Deal found 10/25![Southwest logo]()
$133
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/143:48 pm -
1 stop20h 03m
Wed 12/162:53 pm -
1 stop26h 11m
Deal found 10/29![Frontier logo]()
$134
Best flights from San Jose to OntarioDiscover carefully curated flight deals from San Jose to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
Discover carefully curated flight deals from San Jose to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
This Southwest deal was found by Cheapflights users on 10/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/199:25 pm -
Nonstop1h 15m
Mon 12/219:30 am -
Nonstop1h 20m
Deal found 10/27![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1911:55 am -
Nonstop1h 20m
Mon 11/2310:35 am -
Nonstop1h 15m
Deal found 10/28![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:40 pm -
Nonstop1h 25m
Mon 12/75:55 am -
1 stop4h 05m
Deal found 10/29![Southwest logo]()
$127
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/82:15 pm -
Nonstop1h 20m
Sun 1/106:00 pm -
Nonstop1h 15m
Deal found 10/28![Southwest logo]()
$201
This Southwest deal was found by Cheapflights users on 10/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/156:30 am -
Nonstop1h 20m
Sun 1/178:25 am -
Nonstop1h 15m
Deal found 10/27![Southwest logo]()
$201
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/18:30 am -
Nonstop1h 15m
Sun 1/39:15 pm -
Nonstop1h 20m
Deal found 10/29![Southwest logo]()
$288
This Southwest deal was found by Cheapflights users on 10/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/197:15 am -
2 stops8h 05m
Tue 12/225:00 pm -
2 stops6h 35m
Deal found 10/25![Southwest logo]()
$373
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/188:15 am -
2 stops8h 05m
Sun 12/202:00 pm -
1 stop6h 25m
Deal found 10/28![Southwest logo]()
$377
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:00 pm -
2 stops5h 00m
Sun 11/299:40 pm -
Nonstop1h 15m
Deal found 10/29![Southwest logo]()
$382
Last-minute flights from San Jose to OntarioDiscover last-minute flight deals from San Jose to Ontario. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from San Jose to Ontario. Data last updated October 30, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 10/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/152:41 pm -
1 stop20h 35m
Fri 11/202:01 pm -
1 stop25h 29m
Deal found 10/26![Frontier logo]()
$136
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/162:41 pm -
1 stop18h 59m
Thu 11/198:35 pm -
1 stop18h 55m
Deal found 10/27![Frontier logo]()
$126
This Southwest deal was found by Cheapflights users on 10/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/189:05 am -
1 stop7h 05m
Mon 11/236:50 pm -
1 stop4h 00m
Deal found 10/25![Southwest logo]()
$137
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:30 am -
1 stop3h 15m
Wed 11/1812:50 pm -
2 stops7h 00m
Deal found 10/28![Southwest logo]()
$142
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:30 am -
Nonstop1h 15m
Sat 11/216:00 am -
Nonstop1h 15m
Deal found 10/29![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:30 am -
Nonstop1h 15m
Mon 11/236:50 pm -
1 stop4h 00m
Deal found 10/28![Southwest logo]()
$127
This Frontier deal was found by Cheapflights users on 10/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/192:41 pm -
1 stop5h 42m
Mon 11/238:15 am -
1 stop7h 15m
Deal found 10/25![Frontier logo]()
$143
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:15 pm -
1 stop3h 21m
Mon 11/238:15 am -
1 stop7h 15m
Deal found 10/27![Frontier logo]()
$141
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:30 pm -
Nonstop1h 25m
Tue 12/13:50 pm -
2 stops6h 30m
Deal found 10/29![Southwest logo]()
$132
This Southwest deal was found by Cheapflights users on 10/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:10 am -
Nonstop1h 20m
Wed 11/259:35 pm -
1 stop10h 05m
Deal found 10/25![Southwest logo]()
$133
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/264:15 pm -
1 stop15h 05m
Thu 12/38:00 am -
1 stop7h 07m
Deal found 10/27![Frontier logo]()
$128
One-way flights from San Jose to OntarioSearch for one-way flight options from San Jose to Ontario. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
Search for one-way flight options from San Jose to Ontario. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/225:59 pm -
1 stop3h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$58
This Southwest deal was found by Cheapflights users on 10/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/262:00 pm -
Nonstop1h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Southwest logo]()
$59
This Jetabroad deal was found by Cheapflights users on 10/27. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/214:15 pm -
1 stop3h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$60
This CheapOair deal was found by Cheapflights users on 10/28. 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 12/215:59 pm -
1 stop14h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$63
This Southwest deal was found by Cheapflights users on 10/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/187:35 am -
1 stop3h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Southwest logo]()
$64
This CheapOair deal was found by Cheapflights users on 10/28. 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.
Thu 12/33:52 pm -
1 stop26h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$65
This FlightHub deal was found by Cheapflights users on 10/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/245:59 pm -
1 stop3h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Frontier logo]()
$66
This CheapOair deal was found by Cheapflights users on 10/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/1212:58 pm -
1 stop4h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Frontier logo]()
$67
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/103:48 pm -
1 stop20h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$68
This Southwest deal was found by Cheapflights users on 10/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/114:45 pm -
1 stop6h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Southwest logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/152:41 pm -
1 stop20h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/112:40 pm -
2 stops27h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$71
Find flight deals from San Jose to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from San Jose (SJC) 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 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $117 (Southwest) |
One-way from | $58 (CheapOair) |
Popular in | August |
Cheapest in | October |
Average price | $196 |
Good round-trip deal | $218 or less |
Good one-way deal | $82 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from San Jose 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 October 30, 2026.
Use the filters below to find and compare flights from San Jose to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Wed 12/16
8:30 am-9:45 am
Nonstop1h 15m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$59
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Fri 1/15
6:30 am-7:50 am
Nonstop1h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$59
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Sat 12/19
9:25 pm-10:40 pm
Nonstop1h 15m
Ontario
Mon 12/21
9:30 am-10:50 am
Nonstop1h 20m
$117
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Thu 11/19
11:55 am-1:15 pm
Nonstop1h 20m
Ontario
Mon 11/23
10:35 am-11:50 am
Nonstop1h 15m
$117
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Thu 12/3
7:40 pm-9:05 pm
Nonstop1h 25m
Ontario
Mon 12/7
5:55 am-10:00 am
1 stop4h 05m
$127
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Fri 11/20
6:30 am-7:45 am
Nonstop1h 15m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$143
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Fri 1/8
2:15 pm-3:35 pm
Nonstop1h 20m
Ontario
Sun 1/10
6:00 pm-7:15 pm
Nonstop1h 15m
$201
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Fri 1/15
6:30 am-7:50 am
Nonstop1h 20m
Ontario
Sun 1/17
8:25 am-9:40 am
Nonstop1h 15m
$201
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Sun 12/20
8:15 am-4:20 pm
2 stops8h 05m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$205
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Tue 12/15
8:00 am-4:05 pm
1 stop8h 05m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$212
Showing 1-10 of 19 resultsSorted by cheapest first
Compare providers for flights from San Jose 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 Jose to Ontario in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on San Jose, California-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Jose, California-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Jose, California-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on San Jose, California-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 Jose, California-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 Jose to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from San Jose with our price prediction graph.
SJC-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 Jose to Ontario
How far ahead should I book a flight from San Jose, California to Ontario?
The price you pay for your flight from San Jose, California to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 11 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from San Jose, California to Ontario?
Currently, October is the cheapest month in which you can book a flight from San Jose, California to Ontario (average of $196). Flying from San Jose, California to Ontario in August is currently the most expensive (average of $329). 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 SJC to ONT?
Find hourly flight availability from San Jose 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 30, 2026.
It’s optimal to fly from San Jose, California to Ontario in the morning. By choosing this option you can save up to 43% on the cost of your flight, compared to a flight at noon.
The best insider tips for San Jose to Ontario flights
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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 30, 2026.
Get a feel of what it's like to fly with Southwest and Frontier from San Jose to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Entertainment
7.4
Crew
8.6
Overall
7.9
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Entertainment
7.4
Crew
8.6
Overall
7.9
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Entertainment
7.4
Crew
8.6
Overall
7.9
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from San Jose 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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Top 2 airlines flying from San Jose to Ontario
Discover the top 2 airlines that operate flights from San Jose 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 October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$33 | Average$141 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$117 | Average$304 | FlexibilityNo cancel fee | On-time63% |