$59+ Cheap flights from San Jose, CA to Ontario (SJC - 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
Aug 31 — Sep 71
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 September or November, booked 12 days in advance, depart on a Thursday or Wednesday 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 August 1, 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 August 1, 2026.
This Southwest deal was found by Cheapflights users on 7/29. 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 8/2710:55 am
SJC
- ONT
Nonstop1h 15m
Southwest
Sat 8/2911:00 am
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 7/29![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 7/27. 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 9/1110:55 am
SJC
- ONT
Nonstop1h 15m
Southwest
Mon 9/143:40 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 7/27![Southwest logo]()
$122
This Southwest deal was found by Cheapflights users on 7/27. 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 8/299:05 am
SJC
- ONT
Nonstop1h 15m
Southwest
Tue 9/224:45 pm
ONT
- SJC
1 stop3h 20m
Southwest
Deal found 7/27![Southwest logo]()
$123
This Super.com deal was found by Cheapflights users on 7/30. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/312:17 pm
SJC
- ONT
1 stop7h 10m
Frontier
Wed 9/23:40 pm
ONT
- SJC
1 stop20h 27m
Frontier
Deal found 7/30![Frontier logo]()
$131
This Southwest deal was found by Cheapflights users on 7/29. 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.
Sat 8/225:00 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Mon 8/242:40 pm
ONT
- SJC
2 stops6h 55m
Southwest
Deal found 7/29![Southwest logo]()
$132
This Southwest deal was found by Cheapflights users on 7/31. 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 8/299:05 am
SJC
- ONT
Nonstop1h 15m
Southwest
Sat 9/54:40 pm
ONT
- SJC
Nonstop1h 20m
Southwest
Deal found 7/31![Southwest logo]()
$134
This Frontier deal was found by Cheapflights users on 7/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2410:47 pm
SJC
- ONT
1 stop8h 17m
Frontier
Mon 9/288:00 am
ONT
- SJC
1 stop4h 43m
Frontier
Deal found 7/30![Frontier logo]()
$135
This Southwest deal was found by Cheapflights users on 7/30. 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 8/276:45 am
SJC
- ONT
1 stop6h 40m
Southwest
Thu 9/32:40 pm
ONT
- SJC
1 stop6h 50m
Southwest
Deal found 7/30![Southwest logo]()
$137
This Southwest deal was found by Cheapflights users on 7/30. 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.
Sat 9/191:45 pm
SJC
- ONT
2 stops6h 20m
Southwest
Tue 9/224:45 pm
ONT
- SJC
1 stop3h 20m
Southwest
Deal found 7/30![Southwest logo]()
$138
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 August 1, 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 August 1, 2026.
This Southwest deal was found by Cheapflights users on 7/30. 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.
Wed 9/25:05 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Thu 9/1010:55 am
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 7/30![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 7/27. 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 8/291:00 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Mon 9/212:40 pm
ONT
- SJC
2 stops7h 00m
Southwest
Deal found 7/27![Southwest logo]()
$132
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:51 pm
SJC
- ONT
1 stop8h 02m
United Airlines
Sat 9/55:00 am
ONT
- SJC
1 stop8h 08m
United Airlines
Deal found 7/28![United Airlines logo]()
$283
This Southwest deal was found by Cheapflights users on 7/27. 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 9/1110:55 am
SJC
- ONT
Nonstop1h 15m
Southwest
Mon 9/142:40 pm
ONT
- SJC
2 stops6h 35m
Southwest
Deal found 7/27![Southwest logo]()
$137
This Southwest deal was found by Cheapflights users on 7/31. 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 8/293:25 pm
SJC
- ONT
1 stop4h 40m
Southwest
Sat 9/55:50 am
ONT
- SJC
2 stops6h 05m
Southwest
Deal found 7/31![Southwest logo]()
$159
This Southwest deal was found by Cheapflights users on 7/29. 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 8/286:15 am
SJC
- ONT
1 stop3h 40m
Southwest
Sat 8/295:50 am
ONT
- SJC
2 stops6h 50m
Southwest
Deal found 7/29![Southwest logo]()
$201
This Southwest deal was found by Cheapflights users on 7/30. 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.
Sat 10/173:45 pm
SJC
- ONT
2 stops4h 55m
Southwest
Mon 10/196:55 pm
ONT
- SJC
1 stop5h 00m
Southwest
Deal found 7/30![Southwest logo]()
$201
This Southwest deal was found by Cheapflights users on 7/27. 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.
Wed 8/268:40 am
SJC
- ONT
2 stops8h 55m
Southwest
Fri 8/288:00 am
ONT
- SJC
2 stops5h 55m
Southwest
Deal found 7/27![Southwest logo]()
$206
This Southwest deal was found by Cheapflights users on 7/29. 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.
Sat 9/55:00 pm
SJC
- ONT
Nonstop1h 25m
Southwest
Mon 9/76:00 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 7/29![Southwest logo]()
$228
This Southwest deal was found by Cheapflights users on 7/27. 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 8/286:30 am
SJC
- ONT
Nonstop1h 20m
Southwest
Fri 8/282:40 pm
ONT
- SJC
2 stops6h 55m
Southwest
Deal found 7/27![Southwest logo]()
$250
Last-minute flights from San Jose to OntarioDiscover last-minute flight deals from San Jose to Ontario. Data last updated August 1, 2026 and is based on user searches.
Discover last-minute flight deals from San Jose to Ontario. Data last updated August 1, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 7/28. 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 8/1910:55 am
SJC
- ONT
2 stops6h 40m
Southwest
Thu 8/202:40 pm
ONT
- SJC
2 stops6h 30m
Southwest
Deal found 7/28![Southwest logo]()
$147
This Southwest deal was found by Cheapflights users on 7/29. 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.
Sat 8/225:00 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Mon 8/242:40 pm
ONT
- SJC
2 stops6h 55m
Southwest
Deal found 7/29![Southwest logo]()
$132
This Southwest deal was found by Cheapflights users on 8/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/265:05 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Sat 9/124:40 pm
ONT
- SJC
Nonstop1h 20m
Southwest
Deal found 8/1![Southwest logo]()
$151
This Southwest deal was found by Cheapflights users on 7/29. 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 8/2710:55 am
SJC
- ONT
Nonstop1h 15m
Southwest
Sat 8/2911:00 am
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 7/29![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 7/30. 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 8/276:45 am
SJC
- ONT
1 stop6h 40m
Southwest
Thu 9/32:40 pm
ONT
- SJC
1 stop6h 50m
Southwest
Deal found 7/30![Southwest logo]()
$137
This Southwest deal was found by Cheapflights users on 7/27. 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 8/299:05 am
SJC
- ONT
Nonstop1h 15m
Southwest
Tue 9/224:45 pm
ONT
- SJC
1 stop3h 20m
Southwest
Deal found 7/27![Southwest logo]()
$123
This Southwest deal was found by Cheapflights users on 7/31. 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 8/299:05 am
SJC
- ONT
Nonstop1h 15m
Southwest
Sat 9/54:40 pm
ONT
- SJC
Nonstop1h 20m
Southwest
Deal found 7/31![Southwest logo]()
$134
This Super.com deal was found by Cheapflights users on 7/30. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/312:17 pm
SJC
- ONT
1 stop7h 10m
Frontier
Wed 9/23:40 pm
ONT
- SJC
1 stop20h 27m
Frontier
Deal found 7/30![Frontier logo]()
$131
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 August 1, 2026.
Search for one-way flight options from San Jose to Ontario. Find affordable one-way fares based on user searches. Data last updated August 1, 2026.
This Southwest deal was found by Cheapflights users on 7/30. 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.
Sat 8/295:00 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 7/30![Southwest logo]()
$59
This Super.com deal was found by Cheapflights users on 7/30. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/101:38 pm
SJC
- ONT
1 stop17h 26m
Frontier
Deal found 7/30![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 7/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/312:17 pm
SJC
- ONT
1 stop7h 10m
Frontier
Deal found 7/30![Frontier logo]()
$65
This CheapOair deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/51:38 pm
SJC
- ONT
1 stop19h 31m
Frontier
Deal found 7/30![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 8/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/192:24 pm
SJC
- ONT
1 stop5h 35m
Frontier
Deal found 8/1![Frontier logo]()
$71
This Southwest deal was found by Cheapflights users on 7/30. 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.
Mon 8/244:00 pm
SJC
- ONT
2 stops6h 05m
Southwest
Deal found 7/30![Southwest logo]()
$74
This Super.com deal was found by Cheapflights users on 7/31. 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 11/162:24 pm
SJC
- ONT
1 stop6h 24m
Frontier
Deal found 7/31![Frontier logo]()
$75
This Southwest deal was found by Cheapflights users on 8/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:40 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 8/1![Southwest logo]()
$76
This Frontier deal was found by Cheapflights users on 8/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/110:47 pm
SJC
- ONT
1 stop8h 17m
Frontier
Deal found 8/1![Frontier logo]()
$77
This Frontier deal was found by Cheapflights users on 7/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/162:24 pm
SJC
- ONT
1 stop5h 35m
Frontier
Deal found 7/30![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 7/31. 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.
Thu 10/82:24 pm
SJC
- ONT
1 stop19h 57m
Frontier
Deal found 7/31![Frontier logo]()
$81
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 August 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $117 (Southwest) |
One-way from | $59 (Frontier) |
Popular in | January |
Cheapest in | September |
Average price | $309 |
Good round-trip deal | $255 or less |
Good one-way deal | $164 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 2,558,603 searches. Data last updated August 1, 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 - ONT
SJCONT
San Jose
Wed 9/2
5:05 pm-6:25 pm
Nonstop1h 20m
Ontario
Thu 9/10
10:55 am-12:05 pm
Nonstop1h 10m
$117
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 8/29
1:00 pm-2:15 pm
Nonstop1h 15m
Ontario
Mon 9/21
2:40 pm-9:40 pm
2 stops7h 00m
$132
San JoseOntario
SJC - ONT
SJCONT
San Jose
Fri 9/11
10:55 am-12:10 pm
Nonstop1h 15m
Ontario
Mon 9/14
2:40 pm-9:15 pm
2 stops6h 35m
$137
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 8/29
3:25 pm-8:05 pm
1 stop4h 40m
Ontario
Sat 9/5
5:50 am-11:55 am
2 stops6h 05m
$159
San JoseOntario
SJC - ONT
SJCONT
San Jose
Fri 8/28
6:15 am-9:55 am
1 stop3h 40m
Ontario
Sat 8/29
5:50 am-12:40 pm
2 stops6h 50m
$201
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 10/17
3:45 pm-8:40 pm
2 stops4h 55m
Ontario
Mon 10/19
6:55 pm-11:55 pm
1 stop5h 00m
$201
San JoseOntario
SJC - ONT
SJCONT
San Jose
Wed 8/26
8:40 am-5:35 pm
2 stops8h 55m
Ontario
Fri 8/28
8:00 am-1:55 pm
2 stops5h 55m
$206
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 9/5
5:00 pm-6:25 pm
Nonstop1h 25m
Ontario
Mon 9/7
6:00 am-7:15 am
Nonstop1h 15m
$228
San JoseOntario
SJC - ONT
SJCONT
San Jose
Fri 8/28
6:30 am-7:50 am
Nonstop1h 20m
Ontario
Fri 8/28
2:40 pm-9:35 pm
2 stops6h 55m
$250
San JoseOntario
SJC - ONT
SJCONT
San Jose
Tue 9/1
12:51 pm-8:53 pm
1 stop8h 02m
Ontario
Sat 9/5
5:00 am-1:08 pm
1 stop8h 08m
$283
Showing 1-10 of 21 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 August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 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, September is the cheapest month in which you can book a flight from San Jose, California to Ontario (average of $259). Flying from San Jose, California to Ontario in January is currently the most expensive (average of $379). 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 August 1, 2026.
It’s optimal to fly from San Jose, California to Ontario in the afternoon. By choosing this option you can save up to 21% on the cost of your flight, compared to a flight at noon.
What is the cheapest day to fly from San Jose, California to Ontario?
Use this chart to determine the cheapest time to fly round-trip from San Jose to Ontario. Price data was last updated on July 25, 2026.
Travelers seeking maximum savings on their San Jose, California to Ontario flight should consider departing on Monday afternoons when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for San Jose to Ontario flights
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Cheapflights partnered with top experts to bring you the best recommendations for your San Jose to Ontario trip
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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 August 1, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andFrontier 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.
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
8.0
Crew
8.6
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 3 airlines flying from San Jose to Ontario
Discover the top 3 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 2,558,603 searches. Data last updated August 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$40 | Average$163 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$66 | Average$169 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$154 | Average$302 | FlexibilityNo cancel fee | On-time63% |