$50+ 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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJC
Sep 11 — Sep 181
Round-trip
1 adult, Economy
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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 September or August, booked 25 days in advance, depart on a Thursday or Saturday and return on a Thursday
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 August 12, 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 August 12, 2026.
This Southwest deal was found by Cheapflights users on 8/12. 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 9/54:40 pm -
Nonstop1h 20m
Sun 9/67:45 am -
Nonstop1h 15m
Deal found 8/12![Southwest logo]()
$109
This Southwest deal was found by Cheapflights users on 8/9. 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 9/54:40 pm -
Nonstop1h 20m
Wed 9/97:15 am -
Nonstop1h 15m
Deal found 8/9![Southwest logo]()
$152
This Southwest deal was found by Cheapflights users on 8/12. 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 9/94:45 pm -
1 stop3h 25m
Fri 9/116:30 am -
Nonstop1h 20m
Deal found 8/12![Southwest logo]()
$157
This Southwest deal was found by Cheapflights users on 8/12. 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 9/116:00 am -
Nonstop1h 15m
Mon 9/144:45 pm -
Nonstop1h 15m
Deal found 8/12![Southwest logo]()
$158
This Southwest deal was found by Cheapflights users on 8/10. 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 9/68:30 am -
Nonstop1h 15m
Wed 9/912:00 pm -
1 stop5h 35m
Deal found 8/10![Southwest logo]()
$164
This Frontier deal was found by Cheapflights users on 8/11. 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 9/118:00 am -
1 stop4h 43m
Thu 9/2410:47 pm -
1 stop8h 17m
Deal found 8/11![Frontier logo]()
$166
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 August 12, 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 August 12, 2026.
This Southwest deal was found by Cheapflights users on 8/7. 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 9/54:40 pm -
Nonstop1h 20m
Sun 9/67:45 am -
Nonstop1h 15m
Deal found 8/7![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 8/7. 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 9/14:45 pm -
1 stop3h 20m
Wed 9/27:15 am -
Nonstop1h 15m
Deal found 8/7![Southwest logo]()
$157
This Southwest deal was found by Cheapflights users on 8/10. 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 9/215:45 pm -
1 stop4h 40m
Thu 9/246:45 am -
1 stop6h 40m
Deal found 8/10![Southwest logo]()
$224
This Southwest deal was found by Cheapflights users on 8/9. 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 9/64:50 pm -
Nonstop1h 15m
Sun 9/136:30 pm -
1 stop3h 55m
Deal found 8/9![Southwest logo]()
$228
This Southwest deal was found by Cheapflights users on 8/8. 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 9/116:00 am -
Nonstop1h 15m
Sun 9/1312:10 pm -
Nonstop1h 15m
Deal found 8/8![Southwest logo]()
$228
This Southwest deal was found by Cheapflights users on 8/7. 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 9/194:40 pm -
Nonstop1h 20m
Sun 9/209:00 pm -
Nonstop1h 15m
Deal found 8/7![Southwest logo]()
$245
This Southwest deal was found by Cheapflights users on 8/12. 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 9/255:45 pm -
1 stop3h 55m
Mon 9/284:00 pm -
2 stops6h 05m
Deal found 8/12![Southwest logo]()
$258
This Southwest deal was found by Cheapflights users on 8/12. 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 10/165:20 am -
1 stop4h 20m
Fri 10/163:10 pm -
1 stop6h 10m
Deal found 8/12![Southwest logo]()
$281
This Southwest deal was found by Cheapflights users on 8/11. 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 9/255:45 pm -
1 stop3h 55m
Fri 10/24:50 pm -
1 stop4h 30m
Deal found 8/11![Southwest logo]()
$281
This Southwest deal was found by Cheapflights users on 8/7. 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 8/315:15 am -
2 stops6h 40m
Mon 8/312:40 pm -
2 stops6h 00m
Deal found 8/7![Southwest logo]()
$307
Last-minute flights from Ontario to San JoseDiscover last-minute flight deals from Ontario to San Jose. Data last updated August 12, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Jose. Data last updated August 12, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 8/7. 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 8/2911:00 am -
Nonstop1h 10m
Sat 8/295:00 pm -
Nonstop1h 20m
Deal found 8/7![Southwest logo]()
$151
This Southwest deal was found by Cheapflights users on 8/7. 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 9/14:45 pm -
1 stop3h 20m
Wed 9/27:15 am -
Nonstop1h 15m
Deal found 8/7![Southwest logo]()
$157
This Southwest deal was found by Cheapflights users on 8/12. 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 9/54:40 pm -
Nonstop1h 20m
Sun 9/67:45 am -
Nonstop1h 15m
Deal found 8/12![Southwest logo]()
$109
This Southwest deal was found by Cheapflights users on 8/9. 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 9/54:40 pm -
Nonstop1h 20m
Wed 9/97:15 am -
Nonstop1h 15m
Deal found 8/9![Southwest logo]()
$152
This Southwest deal was found by Cheapflights users on 8/12. 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 9/116:00 am -
Nonstop1h 15m
Mon 9/144:45 pm -
Nonstop1h 15m
Deal found 8/12![Southwest logo]()
$158
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 August 12, 2026.
Search for one-way flight options from Ontario to San Jose. Find affordable one-way fares based on user searches. Data last updated August 12, 2026.
This Southwest deal was found by Cheapflights users on 8/11. 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 9/54:40 pm -
Nonstop1h 20m
Deal found 8/11![Southwest logo]()
$50
This Southwest deal was found by Cheapflights users on 8/11. 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 9/61:50 pm -
Nonstop1h 15m
Deal found 8/11![Southwest logo]()
$59
This Southwest deal was found by Cheapflights users on 8/12. 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 9/112:40 pm -
2 stops6h 35m
Deal found 8/12![Southwest logo]()
$65
This Frontier deal was found by Cheapflights users on 8/7. 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 10/18:00 am -
1 stop4h 43m
Deal found 8/7![Frontier logo]()
$71
This Booking.com deal was found by Cheapflights users on 8/7. 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.
Mon 9/218:00 am -
1 stop4h 43m
Deal found 8/7![Frontier logo]()
$76
This Booking.com deal was found by Cheapflights users on 8/7. 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 9/162:30 pm -
1 stop22h 13m
Deal found 8/7![Frontier logo]()
$77
This Booking.com deal was found by Cheapflights users on 8/7. 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.
Fri 9/118:00 am -
1 stop4h 43m
Deal found 8/7![Frontier logo]()
$78
This Trip.com deal was found by Cheapflights users on 8/7. 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 10/152:58 pm -
1 stop22h 31m
Deal found 8/7![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 8/11. 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 9/248:00 am -
1 stop4h 43m
Deal found 8/11![Frontier logo]()
$82
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 August 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $109 (Southwest) |
One-way from | $50 (Southwest) |
Popular in | May |
Cheapest in | September |
Average price | $245 |
Good round-trip deal | $234 or less |
Good one-way deal | $90 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 August 12, 2026.
Use the filters below to find and compare flights from Ontario to San Jose that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Sat 9/5
4:40 pm-6:00 pm
Nonstop1h 20m
San Jose
Sun 9/6
7:45 am-9:00 am
Nonstop1h 15m
$117
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Tue 9/1
4:45 pm-8:05 pm
1 stop3h 20m
San Jose
Wed 9/2
7:15 am-8:30 am
Nonstop1h 15m
$157
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Mon 9/21
5:45 pm-10:25 pm
1 stop4h 40m
San Jose
Thu 9/24
6:45 am-1:25 pm
1 stop6h 40m
$224
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Sun 9/6
4:50 pm-6:05 pm
Nonstop1h 15m
San Jose
Sun 9/13
6:30 pm-10:25 pm
1 stop3h 55m
$228
Quickest round-trip
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Fri 9/11
6:00 am-7:15 am
Nonstop1h 15m
San Jose
Sun 9/13
12:10 pm-1:25 pm
Nonstop1h 15m
$228
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Sat 9/19
4:40 pm-6:00 pm
Nonstop1h 20m
San Jose
Sun 9/20
9:00 pm-10:15 pm
Nonstop1h 15m
$245
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Fri 9/25
5:45 pm-9:40 pm
1 stop3h 55m
San Jose
Mon 9/28
4:00 pm-10:05 pm
2 stops6h 05m
$258
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Fri 10/16
5:20 am-9:40 am
1 stop4h 20m
San Jose
Fri 10/16
3:10 pm-9:20 pm
1 stop6h 10m
$281
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Fri 9/25
5:45 pm-9:40 pm
1 stop3h 55m
San Jose
Fri 10/2
4:50 pm-9:20 pm
1 stop4h 30m
$281
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Mon 8/31
5:15 am-11:55 am
2 stops6h 40m
San Jose
Mon 8/31
2:40 pm-8:40 pm
2 stops6h 00m
$307
Showing 1-10 of 22 resultsSorted by cheapest first
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 August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- 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?
To ensure you get the cheapest price possible for a flight from Ontario to San Jose, California, you should look to book at least 24 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, September is the cheapest month in which you can book a flight from Ontario to San Jose, California (average of $244). Flying from Ontario to San Jose, California in May is currently the most expensive (average of $547). 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 August 12, 2026.
It’s optimal to fly from Ontario to San Jose, California at noon. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight in the evening.
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 August 8, 2026.
Travelers seeking maximum savings on their Ontario to San Jose, California flight should consider departing on Tuesday at noon when fares are most often at their lowest. Monday evenings 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 August 12, 2026.
Peruse reviews from past customers who have flown with Southwest 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.
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
8.0
Boarding
8.1
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
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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 August 12, 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 August 12, 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 August 12, 2026.
Top 2 airlines flying from Ontario to San Jose
Discover the top 2 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 August 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$110 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$138 | Average$336 | FlexibilityNo cancel fee | On-time63% |