$67+ Cheap flights from Ontario to San Jose, CA (ONT - SJC)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJC
Mar 5 — Mar 121
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to San Jose 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 Ontario to San Jose are usually found in May or April, booked 76 days in advance, depart on a Tuesday or Saturday and return on a Monday
Cheap flight deals from Ontario to San Jose
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to San JoseExplore the most affordable flight options available from Ontario to San Jose. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
Explore the most affordable flight options available from Ontario to San Jose. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Thu 2/267:22 pm
ONT
- SJC
1 stop12h 33m
Frontier
Mon 3/29:35 am
SJC
- ONT
1 stop8h 13m
Frontier
Deal found 2/2![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Thu 2/267:22 pm
ONT
- SJC
1 stop12h 33m
Frontier
Sun 3/18:57 pm
SJC
- ONT
1 stop16h 14m
Frontier
Deal found 2/2![Frontier logo]()
$131
This Mytrip deal was found by Cheapflights users on 2/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/197:22 pm
ONT
- SJC
1 stop12h 33m
Frontier
Mon 2/239:35 am
SJC
- ONT
1 stop3h 36m
Frontier
Deal found 2/1![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1110:03 pm
ONT
- SJC
1 stop20h 04m
Frontier
Sun 3/158:20 pm
SJC
- ONT
1 stop11h 46m
Frontier
Deal found 2/1![Frontier logo]()
$166
This Mytrip deal was found by Cheapflights users on 2/2. 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 2/263:24 pm
ONT
- SJC
1 stop16h 31m
Frontier
Thu 3/510:34 am
SJC
- ONT
1 stop7h 53m
Frontier
Deal found 2/2![Frontier logo]()
$185
This Mytrip deal was found by Cheapflights users on 2/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/253:22 pm
ONT
- SJC
1 stop26h 32m
Frontier
Sun 3/18:57 pm
SJC
- ONT
1 stop16h 14m
Frontier
Deal found 2/1![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:22 pm
ONT
- SJC
1 stop22h 45m
Frontier
Sun 3/88:20 pm
SJC
- ONT
1 stop11h 46m
Frontier
Deal found 2/1![Frontier logo]()
$199
This CheapOair deal was found by Cheapflights users on 2/2. 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 4/2311:44 am
ONT
- SJC
1 stop6h 18m
Frontier
Sun 4/268:20 pm
SJC
- ONT
1 stop11h 44m
Frontier
Deal found 2/2![Frontier logo]()
$206
This Gotogate deal was found by Cheapflights users on 2/2. 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.
Thu 3/57:22 pm
ONT
- SJC
1 stop22h 45m
Frontier
Mon 3/98:20 pm
SJC
- ONT
1 stop17h 08m
Frontier
Deal found 2/2![Frontier logo]()
$208
Best flights from Ontario to San JoseDiscover carefully curated flight deals from Ontario to San Jose that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
Discover carefully curated flight deals from Ontario to San Jose that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
This Southwest deal was found by Cheapflights users on 2/1. 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 4/163:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Fri 4/174:50 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 2/1![Southwest logo]()
$247
This Southwest deal was found by Cheapflights users on 1/31. 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.
Sun 4/2610:30 am
ONT
- SJC
Nonstop1h 15m
Southwest
Thu 4/305:50 pm
SJC
- ONT
2 stops5h 15m
Southwest
Deal found 1/31![Southwest logo]()
$262
This Southwest deal was found by Cheapflights users on 2/3. 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 3/206:25 am
ONT
- SJC
Nonstop1h 20m
Southwest
Mon 3/2311:05 am
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 2/3![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 2/2. 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 3/2010:35 am
ONT
- SJC
Nonstop1h 15m
Southwest
Sun 3/229:10 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 2/2![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 1/31. 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.
Tue 3/102:00 pm
ONT
- SJC
Nonstop1h 20m
Southwest
Thu 3/126:20 am
SJC
- ONT
1 stop4h 05m
Southwest
Deal found 1/31![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 2/2. 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 4/23:05 pm
ONT
- SJC
Nonstop1h 20m
Southwest
Sun 4/59:10 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 2/2![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 2/1. 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.
Fri 3/135:25 pm
ONT
- SJC
1 stop6h 05m
Southwest
Mon 3/166:05 am
SJC
- ONT
1 stop6h 35m
Southwest
Deal found 2/1![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 2/1. 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 3/117:00 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Sun 3/156:20 am
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 2/1![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 1/31. 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.
Wed 3/186:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 3/257:50 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 1/31![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 2/2. 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 3/76:10 pm
ONT
- SJC
1 stop4h 10m
Southwest
Sun 3/87:10 pm
SJC
- ONT
1 stop4h 30m
Southwest
Deal found 2/2![Southwest logo]()
$279
Last-minute flights from Ontario to San JoseDiscover last-minute flight deals from Ontario to San Jose. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Jose. Data last updated February 3, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 2/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/197:22 pm
ONT
- SJC
1 stop12h 33m
Frontier
Mon 2/239:35 am
SJC
- ONT
1 stop3h 36m
Frontier
Deal found 2/1![Frontier logo]()
$160
This Mytrip deal was found by Cheapflights users on 2/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/253:22 pm
ONT
- SJC
1 stop26h 32m
Frontier
Sun 3/18:57 pm
SJC
- ONT
1 stop16h 14m
Frontier
Deal found 2/1![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Thu 2/267:22 pm
ONT
- SJC
1 stop12h 33m
Frontier
Mon 3/29:35 am
SJC
- ONT
1 stop8h 13m
Frontier
Deal found 2/2![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Thu 2/267:22 pm
ONT
- SJC
1 stop12h 33m
Frontier
Sun 3/18:57 pm
SJC
- ONT
1 stop16h 14m
Frontier
Deal found 2/2![Frontier logo]()
$131
This Mytrip deal was found by Cheapflights users on 2/2. 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 2/263:24 pm
ONT
- SJC
1 stop16h 31m
Frontier
Thu 3/510:34 am
SJC
- ONT
1 stop7h 53m
Frontier
Deal found 2/2![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:22 pm
ONT
- SJC
1 stop22h 45m
Frontier
Sun 3/88:20 pm
SJC
- ONT
1 stop11h 46m
Frontier
Deal found 2/1![Frontier logo]()
$199
This Flightnetwork deal was found by Cheapflights users on 2/2. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:22 pm
ONT
- SJC
1 stop22h 45m
Frontier
Mon 3/98:20 pm
SJC
- ONT
1 stop17h 08m
Frontier
Deal found 2/2![Frontier logo]()
$208
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1110:03 pm
ONT
- SJC
1 stop20h 04m
Frontier
Sun 3/158:20 pm
SJC
- ONT
1 stop11h 46m
Frontier
Deal found 2/1![Frontier logo]()
$166
One-way flights from Ontario to San JoseSearch for one-way flight options from Ontario to San Jose. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
Search for one-way flight options from Ontario to San Jose. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Wed 3/47:17 pm
ONT
- SJC
1 stop22h 27m
Frontier
Deal found 2/2![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Wed 2/257:17 pm
ONT
- SJC
1 stop22h 37m
Frontier
Deal found 2/2![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Wed 4/292:44 pm
ONT
- SJC
1 stop27h 18m
Frontier
Deal found 2/3![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 2/2. 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 4/1611:44 am
ONT
- SJC
1 stop6h 18m
Frontier
Deal found 2/2![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 2/2. 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 5/411:44 am
ONT
- SJC
1 stop6h 18m
Frontier
Deal found 2/2![Frontier logo]()
$80
This American Airlines deal was found by Cheapflights users on 2/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2812:26 pm
ONT
- SJC
1 stop6h 19m
American Airlines
Deal found 2/1![American Airlines logo]()
$81
This Super.com deal was found by Cheapflights users on 2/2. 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 2/193:24 pm
ONT
- SJC
1 stop16h 31m
Frontier
Deal found 2/2![Frontier logo]()
$85
This Booking.com deal was found by Cheapflights users on 2/2. 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.
Wed 3/1810:03 pm
ONT
- SJC
1 stop20h 04m
Frontier
Deal found 2/2![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/3011:17 am
ONT
- SJC
1 stop6h 50m
Frontier
Deal found 2/3![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/172:06 pm
ONT
- SJC
2 stops43h 33m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$95
This Southwest deal was found by Cheapflights users on 2/2. 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 4/14:35 pm
ONT
- SJC
2 stops6h 35m
Southwest
Deal found 2/2![Southwest logo]()
$100
Find flight deals from Ontario to San Jose
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Jose (SJC). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $128 (Kiwi.com) |
One-way from | $67 (Kiwi.com) |
Popular in | January |
Cheapest in | May |
Average price | $259 |
Good round-trip deal | $286 or less |
Good one-way deal | $137 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to San Jose that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Ontario to San Jose that are best for you.
Fly from
Ontario
Fly to
San Jose
Route
Depart
Return
Price
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Thu 4/16
3:55 pm-5:10 pm
Nonstop1h 15m
San Jose
Fri 4/17
4:50 pm-6:10 pm
Nonstop1h 20m
$247
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Sun 4/26
10:30 am-11:45 am
Nonstop1h 15m
San Jose
Thu 4/30
5:50 pm-11:05 pm
2 stops5h 15m
$262
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Fri 3/20
6:25 am-7:45 am
Nonstop1h 20m
San Jose
Mon 3/23
11:05 am-12:25 pm
Nonstop1h 20m
$279
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Fri 3/20
10:35 am-11:50 am
Nonstop1h 15m
San Jose
Sun 3/22
9:10 pm-10:25 pm
Nonstop1h 15m
$279
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Tue 3/10
2:00 pm-3:20 pm
Nonstop1h 20m
San Jose
Thu 3/12
6:20 am-10:25 am
1 stop4h 05m
$279
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Thu 4/2
3:05 pm-4:25 pm
Nonstop1h 20m
San Jose
Sun 4/5
9:10 pm-10:25 pm
Nonstop1h 15m
$279
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Fri 3/13
5:25 pm-11:30 pm
1 stop6h 05m
San Jose
Mon 3/16
6:05 am-12:40 pm
1 stop6h 35m
$279
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 3/11
7:00 pm-8:15 pm
Nonstop1h 15m
San Jose
Sun 3/15
6:20 am-7:40 am
Nonstop1h 20m
$279
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 3/18
6:45 am-8:00 am
Nonstop1h 15m
San Jose
Wed 3/25
7:50 pm-9:05 pm
Nonstop1h 15m
$279
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Sat 3/7
6:10 pm-10:20 pm
1 stop4h 10m
San Jose
Sun 3/8
7:10 pm-11:40 pm
1 stop4h 30m
$279
Showing 1-10 of 18 results
Compare providers for flights from Ontario to San Jose
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 Ontario to San Jose in February.
| 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 Ontario-San Jose, California flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Jose, California flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-San Jose, California flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-San Jose, California 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 Ontario-San Jose, California 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 Ontario to San Jose
Have a flexible travel schedule? Discover the best time to fly to San Jose from Ontario with our price prediction graph.
ONT-SJC
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 Ontario to San Jose
How far ahead should I book a flight from Ontario to San Jose, California?
Use this chart to determine the optimal time to book a round-trip flight from Ontario to San Jose. Price data was last updated on January 30, 2026.
To ensure you get the cheapest price possible for a flight from Ontario to San Jose, California, you should look to book at least 76 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Ontario to San Jose, California?
Currently, February is the cheapest month in which you can book a flight from Ontario to San Jose, California (average of $19). Flying from Ontario to San Jose, California in November is currently the most expensive (average of $62). 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 ONT to SJC?
Find hourly flight availability from Ontario to San Jose. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 3, 2026.
It’s optimal to fly from Ontario to San Jose, California at noon. By choosing this option you can save up to 34% on the cost of your flight, compared to a flight in the morning.
What is the cheapest day to fly from Ontario to San Jose, California?
Use this chart to determine the cheapest time to fly round-trip from Ontario to San Jose. Price data was last updated on January 31, 2026.
Travelers seeking maximum savings on their Ontario to San Jose, California flight should consider departing on Wednesday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for Ontario to San Jose 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 Ontario to San Jose trip
Our travel experts
Reviews of airlines servicing San Jose
Get insights into the airlines that provide service to San Jose. 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 San Jose. Reviews last updated February 3, 2026.
Peruse reviews from past customers who have flown with Southwest, United Airlines, and Frontier from Ontario to San Jose to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Related info for your journey
Find useful and relevant information for your journey from Ontario to San Jose. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Ontario
Popular flights
San Jose flight routes
Alternative routes for Ontario to San Jose
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Jose by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to San Jose by cabin class
Find flights from Ontario to San Jose, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and San Jose flights
Browse other Ontario and San Jose flight options. Last updated on February 3, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on February 3, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Jose
Explore flights to San Jose departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 3, 2026.
Top 3 airlines flying from Ontario to San Jose
Discover the top 3 airlines that operate flights from Ontario to San Jose. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$34 | Average$114 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$89 | Average$187 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$97 | Average$261 | FlexibilityNo cancel fee | On-time63% |