$69+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
SJC — ONT
May 27 — Jun 31
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 August or June, booked 12 days in advance, depart on a Monday or Thursday and return on a Saturday
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 April 27, 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 April 27, 2026.
This Southwest deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:20 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Wed 6/108:55 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 4/26![Southwest logo]()
$137
This CheapOair deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/182:12 pm
SJC
- ONT
1 stop25h 32m
Frontier
Wed 5/204:39 pm
ONT
- SJC
1 stop20h 38m
Frontier
Deal found 4/26![Frontier logo]()
$140
This CheapOair deal was found by Cheapflights users on 4/22. 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.
Mon 5/112:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Thu 5/144:04 pm
ONT
- SJC
1 stop21h 13m
Frontier
Deal found 4/22![Frontier logo]()
$160
This Trip.com deal was found by Cheapflights users on 4/23. 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.
Mon 5/112:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Wed 5/134:39 pm
ONT
- SJC
1 stop20h 38m
Frontier
Deal found 4/23![Frontier logo]()
$176
This Southwest deal was found by Cheapflights users on 4/23. 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 5/166:50 am
SJC
- ONT
Nonstop1h 15m
Southwest
Sat 5/165:50 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 4/23![Southwest logo]()
$177
This Frontier deal was found by Cheapflights users on 4/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/72:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Fri 5/88:44 am
ONT
- SJC
1 stop4h 33m
Frontier
Deal found 4/22![Frontier logo]()
$180
This CheapOair deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/62:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Wed 6/103:34 pm
ONT
- SJC
1 stop21h 43m
Frontier
Deal found 4/26![Frontier logo]()
$185
This Southwest deal was found by Cheapflights users on 4/23. 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 5/234:25 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Sat 5/302:50 pm
ONT
- SJC
1 stop6h 00m
Southwest
Deal found 4/23![Southwest logo]()
$187
This Trip.com deal was found by Cheapflights users on 4/22. 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 5/72:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Sun 5/1011:36 am
ONT
- SJC
1 stop25h 41m
Frontier
Deal found 4/22![Frontier logo]()
$194
This Trip.com deal was found by Cheapflights users on 4/24. 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 6/42:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Wed 6/171:33 pm
ONT
- SJC
1 stop23h 44m
Frontier
Deal found 4/24![Frontier logo]()
$195
This Southwest deal was found by Cheapflights users on 4/24. 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 5/236:45 am
SJC
- ONT
1 stop4h 20m
Southwest
Sat 5/233:35 pm
ONT
- SJC
1 stop5h 40m
Southwest
Deal found 4/24![Southwest logo]()
$197
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 April 27, 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 April 27, 2026.
This Southwest deal was found by Cheapflights users on 4/24. 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 6/46:35 am
SJC
- ONT
Nonstop1h 20m
Southwest
Wed 6/175:30 am
ONT
- SJC
1 stop3h 30m
Southwest
Deal found 4/24![Southwest logo]()
$273
This United Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/282:32 pm
SJC
- ONT
1 stop6h 10m
United Airlines
Sat 5/305:00 am
ONT
- SJC
1 stop8h 24m
United Airlines
Deal found 4/26![United Airlines logo]()
$328
This Alaska Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/278:00 am
SJC
- ONT
1 stop7h 09m
Alaska Airlines
Wed 5/277:48 pm
ONT
- SJC
1 stop15h 05m
Alaska Airlines
Deal found 4/25![Alaska Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:20 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Tue 5/195:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 4/25![Southwest logo]()
$288
This Southwest deal was found by Cheapflights users on 4/22. 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 6/67:30 pm
SJC
- ONT
1 stop3h 20m
Southwest
Sat 6/139:50 am
ONT
- SJC
2 stops8h 05m
Southwest
Deal found 4/22![Southwest logo]()
$291
This Southwest deal was found by Cheapflights users on 4/22. 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 6/137:30 pm
SJC
- ONT
1 stop3h 20m
Southwest
Wed 6/174:35 pm
ONT
- SJC
1 stop6h 50m
Southwest
Deal found 4/22![Southwest logo]()
$309
This Southwest deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/189:45 am
SJC
- ONT
1 stop5h 20m
Southwest
Sun 9/206:10 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 4/25![Southwest logo]()
$319
This Southwest deal was found by Cheapflights users on 4/24. 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 6/198:15 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Sun 6/219:30 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 4/24![Southwest logo]()
$319
This Southwest deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/146:05 am
SJC
- ONT
1 stop5h 35m
Southwest
Sun 6/144:50 pm
ONT
- SJC
1 stop7h 00m
Southwest
Deal found 4/26![Southwest logo]()
$319
This Southwest deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/62:15 pm
SJC
- ONT
2 stops7h 45m
Southwest
Sun 6/74:50 pm
ONT
- SJC
2 stops7h 05m
Southwest
Deal found 4/25![Southwest logo]()
$329
Last-minute flights from San Jose to OntarioDiscover last-minute flight deals from San Jose to Ontario. Data last updated April 27, 2026 and is based on user searches.
Discover last-minute flight deals from San Jose to Ontario. Data last updated April 27, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/38:19 pm
SJC
- ONT
1 stop11h 45m
Frontier
Wed 5/64:39 pm
ONT
- SJC
1 stop20h 38m
Frontier
Deal found 4/26![Frontier logo]()
$239
This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/38:19 pm
SJC
- ONT
1 stop11h 45m
Frontier
Mon 5/412:22 pm
ONT
- SJC
1 stop5h 22m
Frontier
Deal found 4/26![Frontier logo]()
$315
This Trip.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/48:22 pm
SJC
- ONT
1 stop19h 22m
Frontier
Thu 5/74:04 pm
ONT
- SJC
1 stop21h 13m
Frontier
Deal found 4/25![Frontier logo]()
$247
This Frontier deal was found by Cheapflights users on 4/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/72:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Fri 5/88:44 am
ONT
- SJC
1 stop4h 33m
Frontier
Deal found 4/22![Frontier logo]()
$180
This Trip.com deal was found by Cheapflights users on 4/22. 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 5/72:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Sun 5/1011:36 am
ONT
- SJC
1 stop25h 41m
Frontier
Deal found 4/22![Frontier logo]()
$194
This Frontier deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/72:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Mon 5/118:44 am
ONT
- SJC
1 stop4h 33m
Frontier
Deal found 4/27![Frontier logo]()
$201
This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/72:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Thu 5/144:04 pm
ONT
- SJC
1 stop21h 13m
Frontier
Deal found 4/26![Frontier logo]()
$219
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 April 27, 2026.
Search for one-way flight options from San Jose to Ontario. Find affordable one-way fares based on user searches. Data last updated April 27, 2026.
This Southwest deal was found by Cheapflights users on 4/24. 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 5/196:25 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 4/24![Southwest logo]()
$69
This Super.com deal was found by Cheapflights users on 4/24. 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 5/182:12 pm
SJC
- ONT
1 stop25h 32m
Frontier
Deal found 4/24![Frontier logo]()
$75
This Southwest deal was found by Cheapflights users on 4/24. 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 5/266:10 pm
SJC
- ONT
1 stop4h 05m
Southwest
Deal found 4/24![Southwest logo]()
$79
This Southwest deal was found by Cheapflights users on 4/23. 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 5/2510:40 am
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 4/23![Southwest logo]()
$89
This CheapOair deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/102:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Deal found 4/26![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 4/22. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/302:12 pm
SJC
- ONT
1 stop17h 52m
Frontier
Deal found 4/22![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2512:57 pm
SJC
- ONT
2 stops43h 07m
Frontier
Deal found 4/25![Frontier logo]()
$96
This Southwest deal was found by Cheapflights users on 4/23. 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 6/106:20 pm
SJC
- ONT
1 stop4h 40m
Southwest
Deal found 4/23![Southwest logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/272:12 pm
SJC
- ONT
1 stop5h 39m
Frontier
Deal found 4/27![Frontier logo]()
$105
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 April 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Southwest) |
One-way from | $69 (Southwest) |
Popular in | January |
Cheapest in | August |
Average price | $288 |
Good round-trip deal | $282 or less |
Good one-way deal | $149 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 April 27, 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 - ONT
SJCONT
San Jose
Thu 6/4
6:35 am-7:55 am
Nonstop1h 20m
Ontario
Wed 6/17
5:30 am-9:00 am
1 stop3h 30m
$273
San JoseOntario
SJC - ONT
SJCONT
San Jose
Thu 5/14
8:20 pm-9:35 pm
Nonstop1h 15m
Ontario
Tue 5/19
5:45 am-7:00 am
Nonstop1h 15m
$288
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 6/6
7:30 pm-10:50 pm
1 stop3h 20m
Ontario
Sat 6/13
9:50 am-5:55 pm
2 stops8h 05m
$291
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 6/13
7:30 pm-10:50 pm
1 stop3h 20m
Ontario
Wed 6/17
4:35 pm-11:25 pm
1 stop6h 50m
$309
San JoseOntario
SJC - ONT
SJCONT
San Jose
Fri 9/18
9:45 am-3:05 pm
1 stop5h 20m
Ontario
Sun 9/20
6:10 am-7:25 am
Nonstop1h 15m
$319
Quickest round-trip
San JoseOntario
SJC - ONT
SJCONT
San Jose
Fri 6/19
8:15 pm-9:30 pm
Nonstop1h 15m
Ontario
Sun 6/21
9:30 pm-10:40 pm
Nonstop1h 10m
$319
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sun 6/14
6:05 am-11:40 am
1 stop5h 35m
Ontario
Sun 6/14
4:50 pm-11:50 pm
1 stop7h 00m
$319
San JoseOntario
SJC - ONT
SJCONT
San Jose
Thu 5/28
2:32 pm-8:42 pm
1 stop6h 10m
Ontario
Sat 5/30
5:00 am-1:24 pm
1 stop8h 24m
$328
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 6/6
2:15 pm-10:00 pm
2 stops7h 45m
Ontario
Sun 6/7
4:50 pm-11:55 pm
2 stops7h 05m
$329
San JoseOntario
SJC - ONT
SJCONT
San Jose
Wed 5/27
8:00 am-3:09 pm
1 stop7h 09m
Ontario
Wed 5/27
7:48 pm-10:53 am
1 stop15h 05m
$388
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 April.
| 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, August is the cheapest month in which you can book a flight from San Jose, California to Ontario (average of $244). Flying from San Jose, California to Ontario in January is currently the most expensive (average of $353). 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 April 27, 2026.
It’s optimal to fly from San Jose, California to Ontario in the afternoon. By choosing this option you can save up to 22% 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 April 25, 2026.
Travelers seeking maximum savings on their San Jose, California to Ontario flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday at noon 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
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
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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 April 27, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited Airlines 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
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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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Alternative routes for San Jose to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from San Jose to Ontario by cabin class
Find flights from San Jose to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on April 27, 2026.
San Jose and Ontario flights
Browse other San Jose and Ontario flight options. Last updated on April 27, 2026.
Other flights from San Jose
Browse through other flights departing from San Jose. Flights are based on user searches made on Cheapflights and were last updated on April 27, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 4 airlines flying from San Jose to Ontario
Discover the top 4 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 April 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$66 | Average$177 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$73 | Average$205 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$287 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$151 | Average$285 | FlexibilityNo cancel fee | On-time63% |