$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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Sep 21 — Sep 281
Round-trip
1 adult, Economy
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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
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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.Cheap flight deals from Ontario to Santa Rosa
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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 August 22, 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 August 22, 2026.
This Trip.com deal was found by Cheapflights users on 8/22. 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.
Sat 9/124:27 pm -
Nonstop1h 40m
Mon 9/142:09 pm -
Nonstop1h 38m
Deal found 8/22![Alaska Airlines logo]()
$151
This Trip.com deal was found by Cheapflights users on 8/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/35:45 pm -
Nonstop1h 40m
Sat 10/103:32 pm -
Nonstop1h 33m
Deal found 8/19![Alaska Airlines logo]()
$152
This Alaska Airlines deal was found by Cheapflights users on 8/21. 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 10/145:45 pm -
Nonstop1h 40m
Wed 10/213:32 pm -
Nonstop1h 33m
Deal found 8/21![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 8/18. 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.
Tue 11/35:45 am -
1 stop6h 30m
Tue 11/106:45 am -
2 stops9h 25m
Deal found 8/18![Southwest logo]()
$162
This Alaska Airlines deal was found by Cheapflights users on 8/20. 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 9/104:27 pm -
Nonstop1h 40m
Sat 9/122:09 pm -
Nonstop1h 38m
Deal found 8/20![Alaska Airlines logo]()
$167
This Delta deal was found by Cheapflights users on 8/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:00 am -
1 stop4h 41m
Sat 10/174:49 pm -
1 stop5h 22m
Deal found 8/21![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 8/21. 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.
Thu 10/155:45 pm -
Nonstop1h 40m
Thu 10/223:32 pm -
Nonstop1h 33m
Deal found 8/21![Alaska Airlines logo]()
$207
This Trip.com deal was found by Cheapflights users on 8/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/284:27 pm -
Nonstop1h 40m
Wed 9/302:09 pm -
Nonstop1h 38m
Deal found 8/19![Alaska Airlines logo]()
$210
This Southwest deal was found by Cheapflights users on 8/20. 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.
Tue 9/155:45 am -
1 stop5h 35m
Wed 9/161:40 pm -
2 stops6h 30m
Deal found 8/20![Southwest logo]()
$212
This Alaska Airlines deal was found by Cheapflights users on 8/17. 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 9/294:27 pm -
Nonstop1h 40m
Thu 10/12:09 pm -
Nonstop1h 38m
Deal found 8/17![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 8/21. 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.
Sat 9/195:40 am -
1 stop6h 25m
Mon 9/212:55 pm -
1 stop4h 30m
Deal found 8/21![Southwest logo]()
$224
This Alaska Airlines deal was found by Cheapflights users on 8/20. 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 9/144:27 pm -
Nonstop1h 40m
Fri 9/182:09 pm -
Nonstop1h 38m
Deal found 8/20![Alaska Airlines logo]()
$227
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 August 22, 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 August 22, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/245:45 pm -
Nonstop1h 40m
Wed 10/283:32 pm -
Nonstop1h 33m
Deal found 8/19![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 8/18. 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.
Wed 10/286:00 am -
1 stop4h 41m
Tue 11/34:49 pm -
1 stop5h 22m
Deal found 8/18![Delta logo]()
$177
This Southwest deal was found by Cheapflights users on 8/19. 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.
Mon 9/144:00 pm -
2 stops6h 40m
Thu 9/176:05 am -
2 stops7h 20m
Deal found 8/19![Southwest logo]()
$282
This Alaska Airlines deal was found by Cheapflights users on 8/20. 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 9/144:27 pm -
Nonstop1h 40m
Thu 9/172:09 pm -
Nonstop1h 38m
Deal found 8/20![Alaska Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 8/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:00 am -
1 stop4h 41m
Tue 10/204:49 pm -
1 stop7h 06m
Deal found 8/21![Delta logo]()
$237
This Delta deal was found by Cheapflights users on 8/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/306:00 am -
1 stop4h 41m
Sun 11/14:49 pm -
1 stop5h 22m
Deal found 8/20![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 8/20. 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.
Fri 9/253:40 pm -
2 stops7h 00m
Mon 9/282:55 pm -
1 stop6h 55m
Deal found 8/20![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 9/64:27 pm -
Nonstop1h 40m
Wed 9/92:09 pm -
Nonstop1h 38m
Deal found 8/18![Alaska Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 8/22. 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.
Fri 9/183:40 pm -
2 stops7h 00m
Thu 9/242:55 pm -
2 stops6h 25m
Deal found 8/22![Southwest logo]()
$312
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 9/64:27 pm -
Nonstop1h 40m
Tue 9/82:09 pm -
Nonstop1h 38m
Deal found 8/18![Alaska Airlines logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 10/285:45 pm -
Nonstop1h 40m
Tue 11/33:09 pm -
Nonstop1h 30m
Deal found 8/18![Alaska Airlines logo]()
$307
Last-minute flights from Ontario to Santa RosaDiscover last-minute flight deals from Ontario to Santa Rosa. Data last updated August 22, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Santa Rosa. Data last updated August 22, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 8/20. 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 9/104:27 pm -
Nonstop1h 40m
Sat 9/122:09 pm -
Nonstop1h 38m
Deal found 8/20![Alaska Airlines logo]()
$167
This Southwest deal was found by Cheapflights users on 8/19. 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 9/118:30 am -
1 stop5h 50m
Mon 9/142:55 pm -
1 stop6h 55m
Deal found 8/19![Southwest logo]()
$257
This Trip.com deal was found by Cheapflights users on 8/22. 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.
Sat 9/124:27 pm -
Nonstop1h 40m
Mon 9/142:09 pm -
Nonstop1h 38m
Deal found 8/22![Alaska Airlines logo]()
$151
This Alaska Airlines deal was found by Cheapflights users on 8/20. 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 9/144:27 pm -
Nonstop1h 40m
Fri 9/182:09 pm -
Nonstop1h 38m
Deal found 8/20![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 8/20. 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.
Tue 9/155:45 am -
1 stop5h 35m
Wed 9/161:40 pm -
2 stops6h 30m
Deal found 8/20![Southwest logo]()
$212
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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.
Thu 9/174:27 pm -
Nonstop1h 40m
Sun 9/202:09 pm -
Nonstop1h 38m
Deal found 8/18![Alaska Airlines logo]()
$262
This Alaska Airlines deal was found by Cheapflights users on 8/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/184:27 pm -
Nonstop1h 40m
Sat 9/192:09 pm -
Nonstop1h 38m
Deal found 8/19![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 8/21. 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.
Sat 9/195:40 am -
1 stop6h 25m
Mon 9/212:55 pm -
1 stop4h 30m
Deal found 8/21![Southwest logo]()
$224
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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.
Fri 9/254:27 pm -
Nonstop1h 40m
Sun 9/272:09 pm -
Nonstop1h 38m
Deal found 8/18![Alaska Airlines logo]()
$207
This Trip.com deal was found by Cheapflights users on 8/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/284:27 pm -
Nonstop1h 40m
Wed 9/302:09 pm -
Nonstop1h 38m
Deal found 8/19![Alaska Airlines logo]()
$210
This Alaska Airlines deal was found by Cheapflights users on 8/17. 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 9/294:27 pm -
Nonstop1h 40m
Thu 10/12:09 pm -
Nonstop1h 38m
Deal found 8/17![Alaska Airlines logo]()
$217
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 August 22, 2026.
Search for one-way flight options from Ontario to Santa Rosa. Find affordable one-way fares based on user searches. Data last updated August 22, 2026.
This Southwest deal was found by Cheapflights users on 8/20. 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.
Tue 9/227:45 am -
1 stop3h 35m
Deal found 8/20![Southwest logo]()
$79
This American Airlines deal was found by Cheapflights users on 8/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/266:30 am -
1 stop6h 24m
Deal found 8/22![American Airlines logo]()
$80
This Southwest deal was found by Cheapflights users on 8/17. 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 9/1211:00 am -
2 stops8h 55m
Deal found 8/17![Southwest logo]()
$84
This Southwest deal was found by Cheapflights users on 8/18. 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 9/118:30 am -
1 stop5h 50m
Deal found 8/18![Southwest logo]()
$89
This Booking.com deal was found by Cheapflights users on 8/17. 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 9/184:27 pm -
Nonstop1h 40m
Deal found 8/17![Alaska Airlines logo]()
$109
This Booking.com deal was found by Cheapflights users on 8/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/45:45 pm -
Nonstop1h 40m
Deal found 8/21![Alaska Airlines logo]()
$113
This Delta deal was found by Cheapflights users on 8/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:00 am -
1 stop4h 41m
Deal found 8/21![Delta logo]()
$119
This KAYAK deal was found by Cheapflights users on 8/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/156:00 am -
1 stop4h 43m
Deal found 8/19![Delta logo]()
$131
This Southwest deal was found by Cheapflights users on 8/21. 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.
Sat 10/311:30 am -
2 stops8h 25m
Deal found 8/21![Southwest logo]()
$134
This KAYAK deal was found by Cheapflights users on 8/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/156:44 pm -
Nonstop1h 36m
Deal found 8/19![Alaska Airlines logo]()
$136
This Booking.com deal was found by Cheapflights users on 8/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/204:27 pm -
Nonstop1h 40m
Deal found 8/21![Alaska Airlines logo]()
$142
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 August 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $151 (Trip.com) |
One-way from | $79 (Southwest) |
Popular in | October |
Cheapest in | November |
Average price | $257 |
Good round-trip deal | $217 or less |
Good one-way deal | $128 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 7,457,451 searches. Data last updated August 22, 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 Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Sat 10/24
5:45 pm-7:25 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Wed 10/28
3:32 pm-5:05 pm
Nonstop1h 33m
$157
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Wed 10/28
6:00 am-10:41 am
1 stop4h 41m
Santa Rosa Sonoma County
Tue 11/3
4:49 pm-10:11 pm
1 stop5h 22m
$177
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Mon 9/14
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Thu 9/17
2:09 pm-3:47 pm
Nonstop1h 38m
$217
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Sun 10/18
6:00 am-10:41 am
1 stop4h 41m
Santa Rosa Sonoma County
Tue 10/20
4:49 pm-11:55 pm
1 stop7h 06m
$237
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Fri 10/30
6:00 am-10:41 am
1 stop4h 41m
Santa Rosa Sonoma County
Sun 11/1
4:49 pm-10:11 pm
1 stop5h 22m
$257
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Mon 9/14
4:00 pm-10:40 pm
2 stops6h 40m
Santa Rosa Sonoma County
Thu 9/17
6:05 am-1:25 pm
2 stops7h 20m
$282
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Fri 9/25
3:40 pm-10:40 pm
2 stops7h 00m
Santa Rosa Sonoma County
Mon 9/28
2:55 pm-9:50 pm
1 stop6h 55m
$287
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Sun 9/6
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Wed 9/9
2:09 pm-3:47 pm
Nonstop1h 38m
$297
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Sun 9/6
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Tue 9/8
2:09 pm-3:47 pm
Nonstop1h 38m
$297
Quickest round-trip
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Wed 10/28
5:45 pm-7:25 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Tue 11/3
3:09 pm-4:39 pm
Nonstop1h 30m
$307
Showing 1-10 of 19 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 August.
| 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 August 22, 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 in the afternoon.
How much does it cost to fly round-trip from Ontario to Santa Rosa?
Airfare is below average for this route at the moment.
Ontario to Santa Rosa flights typically cost between $237 and $316 in September.The cheapest round-trip price found within the last 5 days was $151 on Alaska Airlines (Sep 12-Sep 14).
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 August 22, 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.
Boarding
8.1
Overall
7.9
Comfort
7.8
Food
7.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Overall
7.9
Comfort
7.8
Food
7.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Overall
7.9
Comfort
7.8
Food
7.0
Crew
8.5
Entertainment
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 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
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Ontario and Santa Rosa flights
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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 7,457,451 searches. Data last updated August 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$117 | Average$242 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$236 | Average$526 | FlexibilityNo cancel fee | On-time71% |