$79+ Cheap flights from Ontario to Santa Rosa (ONT - STS)
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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Jul 23 — Jul 301
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to Santa Rosa 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.Cheap flight deals from Ontario to Santa Rosa
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to Santa RosaExplore the most affordable flight options available from Ontario to Santa Rosa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 23, 2026.
Explore the most affordable flight options available from Ontario to Santa Rosa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 23, 2026.
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/264:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Tue 9/292:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Thu 9/102:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/34:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Fri 9/112:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$177
This Delta deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:00 am
ONT
- STS
1 stop4h 39m
Delta
Sat 11/711:25 am
STS
- ONT
1 stop4h 47m
Delta
Deal found 6/18![Delta logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:31 pm
ONT
- STS
Nonstop1h 36m
Alaska Airlines
Wed 11/113:02 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 6/18![Alaska Airlines logo]()
$192
This Delta deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:00 am
ONT
- STS
1 stop4h 39m
Delta
Fri 11/64:55 pm
STS
- ONT
1 stop6h 53m
Delta
Deal found 6/18![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:00 am
ONT
- STS
1 stop4h 39m
Delta
Wed 11/114:55 pm
STS
- ONT
1 stop6h 53m
Delta
Deal found 6/18![Delta logo]()
$202
This CheapOair deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/274:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sun 8/302:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$209
This CheapOair deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/244:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sun 9/272:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$211
This Delta deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:00 am
ONT
- STS
1 stop4h 39m
Delta
Sat 11/711:25 am
STS
- ONT
1 stop4h 47m
Delta
Deal found 6/18![Delta logo]()
$212
This Alaska Airlines deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/154:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Wed 9/162:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:20 am
ONT
- STS
1 stop5h 55m
Southwest
Tue 8/186:00 am
STS
- ONT
2 stops7h 35m
Southwest
Deal found 6/22![Southwest logo]()
$218
Best flights from Ontario to Santa RosaDiscover carefully curated flight deals from Ontario to Santa Rosa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 23, 2026.
Discover carefully curated flight deals from Ontario to Santa Rosa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 23, 2026.
This Alaska Airlines deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/164:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sun 9/202:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$167
This Southwest deal was found by Cheapflights users on 6/22. 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 9/55:40 am
ONT
- STS
1 stop6h 25m
Southwest
Sat 9/122:00 pm
STS
- ONT
1 stop6h 05m
Southwest
Deal found 6/22![Southwest logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/196:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mon 7/274:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Wed 7/294:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/236:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Fri 7/314:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Thu 7/304:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/34:40 pm
ONT
- STS
2 stops6h 55m
Southwest
Thu 8/62:55 pm
STS
- ONT
1 stop4h 30m
Southwest
Deal found 6/22![Southwest logo]()
$303
This Alaska Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/296:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Thu 8/64:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/18![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/315:15 pm
ONT
- STS
2 stops6h 20m
Southwest
Sat 8/86:00 am
STS
- ONT
2 stops8h 15m
Southwest
Deal found 6/19![Southwest logo]()
$317
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/246:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mon 7/274:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/226:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/18![Alaska Airlines logo]()
$407
Last-minute flights from Ontario to Santa RosaDiscover last-minute flight deals from Ontario to Santa Rosa. Data last updated June 23, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Santa Rosa. Data last updated June 23, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/83:30 pm
ONT
- STS
2 stops7h 20m
Southwest
Wed 7/156:00 am
STS
- ONT
2 stops6h 25m
Southwest
Deal found 6/19![Southwest logo]()
$232
This Trip.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/194:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$224
This Southwest deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/204:00 pm
ONT
- STS
2 stops7h 35m
Southwest
Tue 7/216:00 am
STS
- ONT
2 stops6h 25m
Southwest
Deal found 6/22![Southwest logo]()
$202
This Southwest deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:15 am
ONT
- STS
2 stops5h 50m
Southwest
Tue 7/282:15 pm
STS
- ONT
1 stop6h 05m
Southwest
Deal found 6/21![Southwest logo]()
$252
This Southwest deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/234:40 pm
ONT
- STS
2 stops6h 55m
Southwest
Wed 7/292:15 pm
STS
- ONT
1 stop8h 35m
Southwest
Deal found 6/20![Southwest logo]()
$233
This CheapOair deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/236:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/19![Alaska Airlines logo]()
$240
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/246:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sat 7/254:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/251:25 pm
ONT
- STS
2 stops8h 30m
Southwest
Wed 7/292:15 pm
STS
- ONT
1 stop6h 05m
Southwest
Deal found 6/18![Southwest logo]()
$223
One-way flights from Ontario to Santa RosaSearch for one-way flight options from Ontario to Santa Rosa. Find affordable one-way fares based on user searches. Data last updated June 23, 2026.
Search for one-way flight options from Ontario to Santa Rosa. Find affordable one-way fares based on user searches. Data last updated June 23, 2026.
This Delta deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:00 am
ONT
- STS
1 stop4h 39m
Delta
Deal found 6/18![Delta logo]()
$79
This Delta deal was found by Cheapflights users on 6/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/76:00 am
ONT
- STS
1 stop4h 39m
Delta
Deal found 6/23![Delta logo]()
$89
This Delta deal was found by Cheapflights users on 6/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/89:55 am
ONT
- STS
1 stop6h 13m
Delta
Deal found 6/23![Delta logo]()
$99
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:31 pm
ONT
- STS
Nonstop1h 36m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$109
This Trip.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/304:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$114
This Priceline deal was found by Cheapflights users on 6/22. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/234:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$119
This Delta deal was found by Cheapflights users on 6/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:00 am
ONT
- STS
1 stop4h 39m
Delta
Deal found 6/23![Delta logo]()
$124
This Southwest deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/184:00 pm
ONT
- STS
2 stops6h 35m
Southwest
Deal found 6/18![Southwest logo]()
$129
This Alaska Airlines deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$144
This Southwest deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/236:25 am
ONT
- STS
1 stop7h 10m
Southwest
Deal found 6/19![Southwest logo]()
$154
This Southwest deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/153:30 pm
ONT
- STS
2 stops7h 20m
Southwest
Deal found 6/20![Southwest logo]()
$159
Find flight deals from Ontario to Santa Rosa
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Santa Rosa (STS). 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 June 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $157 (Alaska Airlines) |
One-way from | $79 (Delta) |
Popular in | October |
Cheapest in | November |
Average price | $187 |
Good round-trip deal | $227 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Santa Rosa 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 June 23, 2026.
Use the filters below to find and compare flights from Ontario to Santa Rosa that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Wed 9/16
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Sun 9/20
2:09 pm-3:47 pm
Nonstop1h 38m
$167
Quickest round-trip
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sun 7/19
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Mon 7/27
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Mon 7/20
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Wed 7/29
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 7/23
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Fri 7/31
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 7/25
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Thu 7/30
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Wed 7/29
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Thu 8/6
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 7/24
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Mon 7/27
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 9/5
5:40 am-12:05 pm
1 stop6h 25m
Santa Rosa Sonoma County
Sat 9/12
2:00 pm-8:05 pm
1 stop6h 05m
$272
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Mon 8/3
4:40 pm-11:35 pm
2 stops6h 55m
Santa Rosa Sonoma County
Thu 8/6
2:55 pm-7:25 pm
1 stop4h 30m
$303
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 7/31
5:15 pm-11:35 pm
2 stops6h 20m
Santa Rosa Sonoma County
Sat 8/8
6:00 am-2:15 pm
2 stops8h 15m
$317
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Ontario to Santa Rosa
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 Santa Rosa in June.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Santa Rosa flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Santa Rosa flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Santa Rosa flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Santa Rosa 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-Santa Rosa 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 Santa Rosa
Have a flexible travel schedule? Discover the best time to fly to Santa Rosa from Ontario with our price prediction graph.
ONT-STS
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 Santa Rosa
What is the cheapest time of day to fly from ONT to STS?
Find hourly flight availability from Ontario to Santa Rosa. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 23, 2026.
It’s optimal to fly from Ontario to Santa Rosa in the evening. By choosing this option you can save up to 65% on the cost of your flight, compared to a flight at noon.
How much does it cost to fly round-trip from Ontario to Santa Rosa?
Reviews of airlines servicing Santa Rosa
Get insights into the airlines that provide service to Santa Rosa. 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 Santa Rosa. Reviews last updated June 23, 2026.
Read through reviews of airlines operating flights from Ontario to Santa Rosa, such as Alaska Airlines and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Ontario to Santa Rosa. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Santa Rosa?
Book flights to Santa Rosa if you plan to visit one of these locationsFort Bragg
Ukiah
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
Santa Rosa flight routes
Alternative routes for Ontario to Santa Rosa
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Santa Rosa by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Santa Rosa by cabin class
Find flights from Ontario to Santa Rosa, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Santa Rosa flights
Browse other Ontario and Santa Rosa flight options. Last updated on June 23, 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 June 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Santa Rosa
Explore flights to Santa Rosa departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 23, 2026.
Top 2 airlines flying from Ontario to Santa Rosa
Discover the top 2 airlines that operate flights from Ontario to Santa Rosa. 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 June 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$107 | Average$506 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$117 | Average$227 | FlexibilityNo cancel fee | On-time75% |