$59+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
Oct 22 — Oct 291
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 October, booked 12 days in advance, depart on a Thursday or Sunday 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 September 22, 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 September 22, 2026.
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.
Mon 10/195:15 pm -
1 stop5h 00m
Sat 10/2411:30 am -
Nonstop1h 10m
Deal found 9/22![Southwest logo]()
$127
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:02 pm -
1 stop14h 14m
Thu 10/228:35 pm -
1 stop16h 45m
Deal found 9/22![Frontier logo]()
$128
This Super.com deal was found by Cheapflights users on 9/20. 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 10/269:02 pm -
1 stop12h 38m
Thu 10/298:35 pm -
1 stop17h 11m
Deal found 9/20![Frontier logo]()
$130
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.
Wed 10/217:30 pm -
Nonstop1h 25m
Wed 10/286:10 am -
2 stops8h 10m
Deal found 9/22![Southwest logo]()
$132
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/22:41 pm -
1 stop18h 59m
Thu 11/58:35 pm -
1 stop17h 11m
Deal found 9/22![Frontier logo]()
$133
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:35 am -
1 stop3h 45m
Mon 11/26:50 pm -
1 stop5h 05m
Deal found 9/21![Southwest logo]()
$137
This Southwest deal was found by Cheapflights users on 9/17. 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 10/168:25 pm -
Nonstop1h 20m
Mon 10/197:05 pm -
Nonstop1h 10m
Deal found 9/17![Southwest logo]()
$144
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/192:41 pm -
1 stop24h 10m
Mon 11/2310:55 am -
1 stop4h 35m
Deal found 9/21![Frontier logo]()
$148
This Southwest deal was found by Cheapflights users on 9/17. 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 10/96:45 am -
Nonstop1h 20m
Mon 10/129:30 pm -
1 stop9h 50m
Deal found 9/17![Southwest logo]()
$160
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 September 22, 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 September 22, 2026.
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.
Mon 10/196:55 pm -
1 stop3h 20m
Sat 10/245:30 am -
1 stop6h 20m
Deal found 9/22![Southwest logo]()
$137
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.
Wed 10/216:00 am -
1 stop4h 45m
Wed 10/286:10 am -
2 stops8h 10m
Deal found 9/22![Southwest logo]()
$142
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:15 pm -
1 stop5h 35m
Sat 10/2411:30 am -
Nonstop1h 10m
Deal found 9/21![Southwest logo]()
$154
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/198:55 am -
2 stops7h 05m
Mon 2/226:45 am -
Nonstop1h 15m
Deal found 9/21![Southwest logo]()
$206
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.
Sat 11/216:30 am -
Nonstop1h 15m
Sun 11/225:55 am -
Nonstop1h 15m
Deal found 9/22![Southwest logo]()
$248
This Southwest deal was found by Cheapflights users on 9/19. 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 2/1110:35 am -
Nonstop1h 15m
Sun 2/142:00 pm -
Nonstop1h 20m
Deal found 9/19![Southwest logo]()
$248
This Southwest deal was found by Cheapflights users on 9/19. 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 11/66:30 am -
Nonstop1h 15m
Sun 11/85:00 am -
1 stop3h 55m
Deal found 9/19![Southwest logo]()
$275
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 10/236:45 am -
Nonstop1h 20m
Sun 10/256:10 am -
1 stop5h 05m
Deal found 9/22![Southwest logo]()
$275
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.
Thu 12/249:05 am -
1 stop7h 05m
Wed 12/309:50 am -
2 stops7h 10m
Deal found 9/22![Southwest logo]()
$290
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1012:25 pm -
Nonstop1h 20m
Mon 10/129:30 pm -
1 stop9h 50m
Deal found 9/21![Southwest logo]()
$304
This Southwest deal was found by Cheapflights users on 9/18. 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
Mon 11/309:15 pm -
Nonstop1h 20m
Deal found 9/18![Southwest logo]()
$305
Last-minute flights from San Jose to OntarioDiscover last-minute flight deals from San Jose to Ontario. Data last updated September 22, 2026 and is based on user searches.
Discover last-minute flight deals from San Jose to Ontario. Data last updated September 22, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 9/18. 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 10/128:25 pm -
Nonstop1h 20m
Thu 10/159:30 pm -
1 stop9h 35m
Deal found 9/18![Southwest logo]()
$133
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:02 pm -
1 stop14h 14m
Thu 10/228:35 pm -
1 stop16h 45m
Deal found 9/22![Frontier logo]()
$128
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 10/168:25 pm -
Nonstop1h 20m
Mon 10/193:55 pm -
Nonstop1h 10m
Deal found 9/22![Southwest logo]()
$144
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.
Mon 10/195:15 pm -
1 stop5h 00m
Sat 10/2411:30 am -
Nonstop1h 10m
Deal found 9/22![Southwest logo]()
$127
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.
Wed 10/217:30 pm -
Nonstop1h 25m
Wed 10/286:10 am -
2 stops8h 10m
Deal found 9/22![Southwest logo]()
$132
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:45 am -
Nonstop1h 20m
Fri 10/237:05 pm -
Nonstop1h 10m
Deal found 9/21![Southwest logo]()
$171
This Super.com deal was found by Cheapflights users on 9/20. 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 10/269:02 pm -
1 stop12h 38m
Thu 10/298:35 pm -
1 stop17h 11m
Deal found 9/20![Frontier logo]()
$130
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:35 am -
1 stop3h 45m
Mon 11/26:50 pm -
1 stop5h 05m
Deal found 9/21![Southwest logo]()
$137
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 September 22, 2026.
Search for one-way flight options from San Jose to Ontario. Find affordable one-way fares based on user searches. Data last updated September 22, 2026.
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.
Thu 10/156:45 am -
Nonstop1h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Southwest logo]()
$59
This Super.com deal was found by Cheapflights users on 9/19. 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 10/129:02 pm -
1 stop19h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 9/19. 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 10/229:02 pm -
1 stop10h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$65
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/192:41 pm -
1 stop24h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$67
This FlightHub deal was found by Cheapflights users on 9/18. 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 11/264:15 pm -
1 stop22h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$68
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.
Tue 10/139:10 am -
1 stop3h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Southwest logo]()
$69
This CheapOair deal was found by Cheapflights users on 9/20. 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 11/22:41 pm -
1 stop18h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$70
This Southwest deal was found by Cheapflights users on 9/18. 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 10/316:30 am -
2 stops10h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Southwest logo]()
$74
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/199:02 pm -
1 stop13h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Frontier logo]()
$75
This Frontier deal was found by Cheapflights users on 9/18. 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.
Sat 11/214:15 pm -
1 stop3h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 9/19. 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.
Fri 10/239:02 pm -
1 stop19h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 9/19. 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.
Fri 10/169:02 pm -
1 stop19h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![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 September 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $127 (Southwest) |
One-way from | $59 (Southwest) |
Popular in | January |
Cheapest in | September |
Average price | $193 |
Good round-trip deal | $134 or less |
Good one-way deal | $58 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 September 22, 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
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Tue 10/20
7:30 pm-8:55 pm
Nonstop1h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$59
Quickest round-trip
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Wed 10/21
3:05 pm-4:20 pm
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
Wed 10/14
6:00 pm-9:25 pm
1 stop3h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$69
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Fri 10/23
6:15 pm-11:50 pm
1 stop5h 35m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$96
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Thu 11/26
2:00 pm-3:15 pm
Nonstop1h 15m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$133
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Mon 10/19
6:55 pm-10:15 pm
1 stop3h 20m
Ontario
Sat 10/24
5:30 am-11:50 am
1 stop6h 20m
$137
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Wed 10/21
6:00 am-10:45 am
1 stop4h 45m
Ontario
Wed 10/28
6:10 am-2:20 pm
2 stops8h 10m
$142
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Thu 10/15
5:15 pm-11:50 pm
2 stops6h 35m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$148
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Fri 10/23
6:15 pm-11:50 pm
1 stop5h 35m
Ontario
Sat 10/24
11:30 am-12:40 pm
Nonstop1h 10m
$154
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Wed 3/17
6:45 pm-9:50 pm
1 stop3h 05m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$175
Showing 1-10 of 22 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 September.
| 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 $193). 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 September 22, 2026.
It’s optimal to fly from San Jose, California to Ontario in the afternoon. By choosing this option you can save up to 47% on the cost of your flight, compared to a flight at noon.
The best insider tips for San Jose to Ontario flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your San Jose to Ontario trip
Our travel experts
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 22, 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.
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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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 7,457,451 searches. Data last updated September 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$40 | Average$207 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$66 | Average$188 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$118 | Average$300 | FlexibilityNo cancel fee | On-time63% |