$94+ Cheap flights from Santa Rosa to Ontario (STS - ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Dec 10 — Dec 171
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Santa Rosa Sonoma County to Ontario are usually found in April or October, booked 42 days in advance, depart on a Thursday or Tuesday and return on a Wednesday
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 November 10, 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 November 10, 2026.
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/54:50 pm -
1 stop5h 39m
Sat 12/126:00 am -
1 stop4h 42m
Deal found 11/9![Delta logo]()
$187
This American Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/57:10 am -
1 stop5h 28m
Sat 12/121:23 pm -
1 stop6h 07m
Deal found 11/9![American Airlines logo]()
$189
This Southwest deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1212:55 pm -
1 stop5h 50m
Sat 12/193:00 pm -
2 stops8h 10m
Deal found 11/7![Southwest logo]()
$192
This Delta deal was found by Cheapflights users on 11/5. 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.
Thu 12/34:50 pm -
1 stop7h 07m
Tue 12/86:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 11/5. 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.
Thu 12/34:50 pm -
1 stop7h 07m
Fri 12/46:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$207
This Delta deal was found by Cheapflights users on 11/5. 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 12/24:50 pm -
1 stop7h 07m
Sat 12/56:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$227
This American Airlines deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/51:24 pm -
1 stop5h 03m
Tue 12/89:35 am -
1 stop6h 21m
Deal found 11/7![American Airlines logo]()
$228
This Delta deal was found by Cheapflights users on 11/5. 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 12/14:50 pm -
1 stop7h 07m
Sun 12/66:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$237
This American Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/127:10 am -
1 stop5h 28m
Mon 12/149:35 am -
1 stop6h 21m
Deal found 11/9![American Airlines logo]()
$254
This Delta deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:50 pm -
1 stop7h 07m
Wed 12/96:00 am -
1 stop4h 42m
Deal found 11/8![Delta logo]()
$256
This Delta deal was found by Cheapflights users on 11/5. 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.
Thu 11/2611:29 am -
1 stop7h 01m
Tue 12/16:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$267
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 November 10, 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 November 10, 2026.
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/67:00 am -
1 stop5h 12m
Tue 1/125:07 pm -
1 stop4h 56m
Deal found 11/9![Delta logo]()
$187
This Southwest deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/93:00 pm -
1 stop5h 40m
Sat 12/121:10 pm -
2 stops7h 15m
Deal found 11/7![Southwest logo]()
$266
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/54:50 pm -
1 stop5h 39m
Sat 12/126:00 am -
1 stop4h 42m
Deal found 11/9![Delta logo]()
$187
This Delta deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/124:50 pm -
1 stop5h 39m
Mon 12/146:00 am -
1 stop4h 42m
Deal found 11/7![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/164:50 pm -
1 stop7h 07m
Thu 12/176:00 am -
1 stop4h 42m
Deal found 11/9![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 11/5. 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 12/84:50 pm -
1 stop7h 07m
Fri 12/116:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/37:35 am -
2 stops5h 50m
Sun 2/72:25 pm -
2 stops7h 05m
Deal found 11/7![Southwest logo]()
$271
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/124:50 pm -
1 stop5h 39m
Sun 12/136:00 am -
1 stop4h 42m
Deal found 11/9![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/174:50 pm -
1 stop7h 07m
Sun 12/206:00 am -
1 stop4h 45m
Deal found 11/9![Delta logo]()
$207
This Delta deal was found by Cheapflights users on 11/6. 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 12/114:50 pm -
1 stop7h 07m
Sun 12/136:00 am -
1 stop4h 42m
Deal found 11/6![Delta logo]()
$207
This Delta deal was found by Cheapflights users on 11/6. 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 12/64:50 pm -
1 stop7h 07m
Sun 12/136:00 am -
1 stop4h 42m
Deal found 11/6![Delta logo]()
$207
Last-minute flights from Santa Rosa to OntarioDiscover last-minute flight deals from Santa Rosa to Ontario. Data last updated November 10, 2026 and is based on user searches.
Discover last-minute flight deals from Santa Rosa to Ontario. Data last updated November 10, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 11/5. 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.
Thu 11/2611:29 am -
1 stop7h 01m
Wed 12/26:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$267
This Delta deal was found by Cheapflights users on 11/5. 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 12/14:50 pm -
1 stop7h 07m
Sun 12/66:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$237
This Delta deal was found by Cheapflights users on 11/5. 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 12/24:50 pm -
1 stop7h 07m
Sat 12/56:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$227
This Delta deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:50 pm -
1 stop7h 07m
Wed 12/96:00 am -
1 stop4h 42m
Deal found 11/8![Delta logo]()
$256
This Delta deal was found by Cheapflights users on 11/5. 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.
Thu 12/34:50 pm -
1 stop7h 07m
Tue 12/86:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 11/5. 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.
Thu 12/34:50 pm -
1 stop7h 07m
Mon 12/76:00 am -
1 stop4h 42m
Deal found 11/5![Delta logo]()
$207
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/54:50 pm -
1 stop5h 39m
Sat 12/126:00 am -
1 stop4h 42m
Deal found 11/9![Delta logo]()
$187
This American Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/57:10 am -
1 stop5h 28m
Sat 12/121:23 pm -
1 stop6h 07m
Deal found 11/9![American Airlines logo]()
$189
This American Airlines deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/51:24 pm -
1 stop5h 03m
Tue 12/89:35 am -
1 stop6h 21m
Deal found 11/7![American Airlines logo]()
$228
This Southwest deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1212:55 pm -
1 stop5h 50m
Sat 12/193:00 pm -
2 stops8h 10m
Deal found 11/7![Southwest logo]()
$192
This American Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/127:10 am -
1 stop5h 28m
Mon 12/149:35 am -
1 stop6h 21m
Deal found 11/9![American Airlines logo]()
$254
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 November 10, 2026.
Search for one-way flight options from Santa Rosa to Ontario. Find affordable one-way fares based on user searches. Data last updated November 10, 2026.
This Delta deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/54:50 pm -
1 stop5h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![Delta logo]()
$94
This American Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:10 am -
1 stop5h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![American Airlines logo]()
$103
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/44:50 pm -
1 stop7h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Delta logo]()
$104
This Southwest deal was found by Cheapflights users on 11/5. 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 1/77:35 am -
2 stops5h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Southwest logo]()
$109
This Delta deal was found by Cheapflights users on 11/5. 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 12/14:50 pm -
1 stop7h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Delta logo]()
$134
This Southwest deal was found by Cheapflights users on 11/5. 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 12/13:00 pm -
2 stops6h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Southwest logo]()
$173
This Southwest deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/43:00 pm -
2 stops6h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![Southwest logo]()
$193
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/811:27 am -
1 stop4h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Delta logo]()
$210
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/147:00 am -
1 stop5h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Delta logo]()
$230
This Delta deal was found by Cheapflights users on 11/5. 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 1/177:00 am -
1 stop5h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Delta logo]()
$245
This Alaska Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/128:00 am -
2 stops8h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Alaska Airlines logo]()
$257
This Booking.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/158:00 am -
2 stops27h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Alaska Airlines logo]()
$263
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 November 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $187 (Delta) |
One-way from | $94 (Delta) |
Popular in | December |
Cheapest in | April |
Average price | $281 |
Good round-trip deal | $297 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 7,457,451 searches. Data last updated November 10, 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
Quickest round-trip
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 12/8
11:27 am-4:22 pm
1 stop4h 55m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 12/5
4:50 pm-10:29 pm
1 stop5h 39m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Fri 12/11
4:50 pm-11:57 pm
1 stop7h 07m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$104
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 12/1
3:00 pm-9:25 pm
2 stops6h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$173
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Wed 1/6
7:00 am-12:12 pm
1 stop5h 12m
Ontario
Tue 1/12
5:07 pm-10:03 pm
1 stop4h 56m
$187
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 12/5
4:50 pm-10:29 pm
1 stop5h 39m
Ontario
Sat 12/12
6:00 am-10:42 am
1 stop4h 42m
$187
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Fri 12/4
3:00 pm-9:25 pm
2 stops6h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$193
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 12/12
4:50 pm-10:29 pm
1 stop5h 39m
Ontario
Mon 12/14
6:00 am-10:42 am
1 stop4h 42m
$197
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Wed 12/16
4:50 pm-11:57 pm
1 stop7h 07m
Ontario
Thu 12/17
6:00 am-10:42 am
1 stop4h 42m
$197
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 12/8
4:50 pm-11:57 pm
1 stop7h 07m
Ontario
Fri 12/11
6:00 am-10:42 am
1 stop4h 42m
$197
Showing 1-10 of 23 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 November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | 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
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 41 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 December is currently the most expensive (average of $582). 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 November 10, 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 November 10, 2026.
Read reviews from past customers who have flown Alaska 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.
Boarding
8.1
Overall
7.9
Crew
8.5
Entertainment
7.0
Food
7.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Overall
7.9
Crew
8.5
Entertainment
7.0
Food
7.0
Comfort
7.8
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.
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
Ontario flight routes
Other flight options
Other flights from Santa Rosa
Popular flights
Alternative routes for Santa Rosa to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
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 November 10, 2026.
Santa Rosa and Ontario flights
Browse other Santa Rosa and Ontario flight options. Last updated on November 10, 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 November 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top airline flying from Santa Rosa to Ontario
Discover the top airline 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 7,457,451 searches. Data last updated November 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$117 | Average$239 | FlexibilityNo cancel fee | On-time75% |