$79+ Cheap flights from Santa Rosa to Ontario (STS - 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 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Aug 28 — Sep 41
Round-trip
1 adult, Economy
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Find cheap flights from Santa Rosa 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
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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 Santa Rosa Sonoma County to Ontario are usually found in April or June, booked 43 days in advance, depart on a Thursday or Tuesday and return on a Tuesday
Cheap flight deals from Santa Rosa to Ontario
Cheapest
Best
Last-minute
One-way
Cheapest flights from Santa Rosa to OntarioExplore the most affordable flight options available from Santa Rosa to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.
Explore the most affordable flight options available from Santa Rosa to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.
This CheapTickets deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/22:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Wed 9/234:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$150
This CheapTickets deal was found by Cheapflights users on 7/26. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/22:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Tue 9/224:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/26![Alaska Airlines logo]()
$151
This Alaska Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Sat 8/224:32 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:40 pm
STS
- ONT
2 stops6h 30m
Southwest
Wed 9/163:00 pm
ONT
- STS
2 stops6h 30m
Southwest
Deal found 7/28![Southwest logo]()
$161
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:00 am
STS
- ONT
2 stops7h 35m
Southwest
Tue 9/227:45 am
ONT
- STS
1 stop3h 35m
Southwest
Deal found 7/28![Southwest logo]()
$162
This Booking.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/12:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Sun 10/45:45 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/29![Alaska Airlines logo]()
$164
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/21:40 pm
STS
- ONT
2 stops6h 25m
Southwest
Wed 9/233:00 pm
ONT
- STS
2 stops6h 30m
Southwest
Deal found 7/28![Southwest logo]()
$167
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:05 am
STS
- ONT
2 stops7h 20m
Southwest
Tue 9/157:45 am
ONT
- STS
1 stop3h 35m
Southwest
Deal found 7/28![Southwest logo]()
$169
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/211:05 pm
STS
- ONT
1 stop6h 15m
Southwest
Mon 8/243:40 pm
ONT
- STS
2 stops6h 55m
Southwest
Deal found 7/28![Southwest logo]()
$172
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/114:47 pm
STS
- ONT
1 stop7h 11m
Delta
Sat 11/146:00 am
ONT
- STS
1 stop4h 43m
Delta
Deal found 7/28![Delta logo]()
$177
This Booking.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/63:02 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Sun 11/86:31 pm
ONT
- STS
Nonstop1h 36m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$181
Best flights from Santa Rosa to OntarioDiscover carefully curated flight deals from Santa Rosa to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
Discover carefully curated flight deals from Santa Rosa to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
This Alaska Airlines deal was found by Cheapflights users on 7/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/22:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Wed 9/234:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/26![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/21:40 pm
STS
- ONT
1 stop7h 15m
Southwest
Wed 9/237:45 am
ONT
- STS
1 stop3h 35m
Southwest
Deal found 7/27![Southwest logo]()
$162
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/64:50 pm
STS
- ONT
1 stop7h 05m
Delta
Tue 10/139:45 am
ONT
- STS
1 stop6h 20m
Delta
Deal found 7/27![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 7/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/122:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Thu 9/174:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/26![Alaska Airlines logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/192:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Mon 9/214:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/114:47 pm
STS
- ONT
1 stop7h 11m
Delta
Sun 11/156:00 am
ONT
- STS
1 stop4h 43m
Delta
Deal found 7/27![Delta logo]()
$177
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:55 pm
STS
- ONT
2 stops6h 20m
Southwest
Mon 8/243:40 pm
ONT
- STS
2 stops6h 55m
Southwest
Deal found 7/28![Southwest logo]()
$177
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/54:47 pm
STS
- ONT
1 stop5h 21m
Delta
Sun 12/66:00 am
ONT
- STS
1 stop4h 43m
Delta
Deal found 7/28![Delta logo]()
$177
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:05 pm
STS
- ONT
1 stop6h 15m
Southwest
Tue 9/157:45 am
ONT
- STS
1 stop3h 35m
Southwest
Deal found 7/28![Southwest logo]()
$219
This Alaska Airlines deal was found by Cheapflights users on 7/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/252:51 pm
STS
- ONT
Nonstop1h 31m
Alaska Airlines
Sun 12/276:37 pm
ONT
- STS
Nonstop1h 34m
Alaska Airlines
Deal found 7/26![Alaska Airlines logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 7/24. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/267:03 am
STS
- ONT
1 stop7h 13m
Alaska Airlines
Mon 9/284:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/24![Alaska Airlines logo]()
$285
Last-minute flights from Santa Rosa to OntarioDiscover last-minute flight deals from Santa Rosa to Ontario. Data last updated July 29, 2026 and is based on user searches.
Discover last-minute flight deals from Santa Rosa to Ontario. Data last updated July 29, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/172:55 pm
STS
- ONT
1 stop6h 50m
Southwest
Wed 8/197:45 am
ONT
- STS
1 stop3h 35m
Southwest
Deal found 7/27![Southwest logo]()
$207
This Southwest deal was found by Cheapflights users on 7/26. 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.
Mon 8/172:55 pm
STS
- ONT
1 stop4h 30m
Southwest
Fri 8/214:00 pm
ONT
- STS
2 stops6h 35m
Southwest
Deal found 7/26![Southwest logo]()
$222
This Alaska Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/184:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Sat 8/224:32 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$197
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 am
STS
- ONT
2 stops7h 35m
Southwest
Thu 8/208:30 am
ONT
- STS
1 stop5h 50m
Southwest
Deal found 7/27![Southwest logo]()
$162
This CheapTickets deal was found by Cheapflights users on 7/24. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Sat 8/224:32 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/24![Alaska Airlines logo]()
$150
This Southwest deal was found by Cheapflights users on 7/25. 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 8/202:55 pm
STS
- ONT
2 stops7h 15m
Southwest
Mon 8/244:00 pm
ONT
- STS
2 stops6h 35m
Southwest
Deal found 7/25![Southwest logo]()
$167
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/211:05 pm
STS
- ONT
1 stop6h 15m
Southwest
Mon 8/243:40 pm
ONT
- STS
2 stops6h 55m
Southwest
Deal found 7/28![Southwest logo]()
$172
This Southwest deal was found by Cheapflights users on 7/24. 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.
Mon 8/242:55 pm
STS
- ONT
2 stops7h 15m
Southwest
Thu 8/275:40 am
ONT
- STS
1 stop8h 40m
Southwest
Deal found 7/24![Southwest logo]()
$218
This Alaska Airlines deal was found by Cheapflights users on 7/25. 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.
Mon 8/312:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Wed 9/24:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/25![Alaska Airlines logo]()
$217
One-way flights from Santa Rosa to OntarioSearch for one-way flight options from Santa Rosa to Ontario. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
Search for one-way flight options from Santa Rosa to Ontario. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
This Southwest deal was found by Cheapflights users on 7/24. 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.
Mon 9/142:55 pm
STS
- ONT
1 stop6h 55m
Southwest
Deal found 7/24![Southwest logo]()
$79
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2512:58 pm
STS
- ONT
1 stop5h 17m
American Airlines
Deal found 7/27![American Airlines logo]()
$80
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/251:40 pm
STS
- ONT
2 stops7h 15m
Southwest
Deal found 7/28![Southwest logo]()
$84
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/211:05 pm
STS
- ONT
1 stop6h 15m
Southwest
Deal found 7/27![Southwest logo]()
$89
This Kissandfly.com deal was found by Cheapflights users on 7/25. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/82:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/25![Alaska Airlines logo]()
$107
This Trip.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/52:14 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$108
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/13:02 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$119
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2212:58 pm
STS
- ONT
1 stop5h 17m
American Airlines
Deal found 7/27![American Airlines logo]()
$129
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:00 am
STS
- ONT
2 stops7h 35m
Southwest
Deal found 7/27![Southwest logo]()
$134
This SmartFares deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/192:51 pm
STS
- ONT
Nonstop1h 31m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$136
Find flight deals from Santa Rosa to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Santa Rosa (STS) 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 July 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $150 (CheapTickets) |
One-way from | $79 (Southwest) |
Popular in | October |
Cheapest in | April |
Average price | $317 |
Good round-trip deal | $227 or less |
Good one-way deal | $143 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Santa Rosa 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 July 29, 2026.
Use the filters below to find and compare flights from Santa Rosa to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 9/2
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Wed 9/23
4:27 pm-6:07 pm
Nonstop1h 40m
$157
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Sat 9/12
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Thu 9/17
4:27 pm-6:07 pm
Nonstop1h 40m
$157
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Sat 9/19
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Mon 9/21
4:27 pm-6:07 pm
Nonstop1h 40m
$157
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 9/2
1:40 pm-8:55 pm
1 stop7h 15m
Ontario
Wed 9/23
7:45 am-11:20 am
1 stop3h 35m
$162
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Tue 10/6
4:50 pm-11:55 pm
1 stop7h 05m
Ontario
Tue 10/13
9:45 am-4:05 pm
1 stop6h 20m
$177
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 11/11
4:47 pm-11:58 pm
1 stop7h 11m
Ontario
Sun 11/15
6:00 am-10:43 am
1 stop4h 43m
$177
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Fri 8/21
2:55 pm-9:15 pm
2 stops6h 20m
Ontario
Mon 8/24
3:40 pm-10:35 pm
2 stops6h 55m
$177
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Sat 12/5
4:47 pm-10:08 pm
1 stop5h 21m
Ontario
Sun 12/6
6:00 am-10:43 am
1 stop4h 43m
$177
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Fri 9/11
1:05 pm-7:20 pm
1 stop6h 15m
Ontario
Tue 9/15
7:45 am-11:20 am
1 stop3h 35m
$219
Quickest round-trip
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Fri 12/25
2:51 pm-4:22 pm
Nonstop1h 31m
Ontario
Sun 12/27
6:37 pm-8:11 pm
Nonstop1h 34m
$237
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Santa Rosa 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 Santa Rosa to Ontario in July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Santa Rosa-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Santa Rosa-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Santa Rosa-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Santa Rosa-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 Santa Rosa-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 Santa Rosa to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Santa Rosa with our price prediction graph.
STS-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 Santa Rosa to Ontario
Prices
Airlines
How far ahead should I book a flight from Santa Rosa to Ontario?
The best time to book flights from Santa Rosa to Ontario is 32 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Santa Rosa to Ontario?
Currently, April is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $197). Flying from Santa Rosa to Ontario in October is currently the most expensive (average of $756). 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 STS to ONT?
Find hourly flight availability from Santa Rosa 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 July 29, 2026.
When flying from Santa Rosa to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
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 July 29, 2026.
Read reviews from past customers who have flown Alaska Airlines and American Airlines from Santa Rosa to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Overall
7.9
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Overall
7.9
Crew
8.5
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Related info for your journey
Find useful and relevant information for your journey from Santa Rosa 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 Santa Rosa 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 Santa Rosa to Ontario by cabin class
Find flights from Santa Rosa 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 July 29, 2026.
Santa Rosa and Ontario flights
Browse other Santa Rosa and Ontario flight options. Last updated on July 29, 2026.
Other flights from Santa Rosa
Browse through other flights departing from Santa Rosa. Flights are based on user searches made on Cheapflights and were last updated on July 29, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Santa Rosa to Ontario
Discover the top 2 airlines that operate flights from Santa Rosa 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 July 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$117 | Average$239 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$236 | Average$326 | FlexibilityNo cancel fee | On-time71% |