$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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Oct 30 — Nov 61
Round-trip
1 adult, Economy
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Find cheap flights from Santa Rosa to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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 October or April, 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 September 30, 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 September 30, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/233:32 pm -
Nonstop1h 33m
Mon 10/265:45 pm -
Nonstop1h 40m
Deal found 9/29![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/174:49 pm -
1 stop5h 22m
Thu 10/226:00 am -
1 stop4h 41m
Deal found 9/25![Delta logo]()
$177
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:00 am -
2 stops7h 15m
Mon 10/264:25 pm -
2 stops6h 55m
Deal found 9/28![Southwest logo]()
$187
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/234:49 pm -
1 stop7h 06m
Mon 10/266:00 am -
1 stop4h 41m
Deal found 9/29![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:49 pm -
1 stop7h 06m
Mon 10/266:00 am -
1 stop4h 41m
Deal found 9/25![Delta logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/193:32 pm -
Nonstop1h 33m
Tue 10/205:45 pm -
Nonstop1h 40m
Deal found 9/28![Alaska Airlines logo]()
$217
This American Airlines deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/117:25 am -
1 stop5h 13m
Sat 11/141:23 pm -
1 stop6h 08m
Deal found 9/27![American Airlines logo]()
$218
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3011:21 am -
1 stop5h 02m
Sun 11/16:00 am -
1 stop4h 41m
Deal found 9/29![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:30 pm -
2 stops8h 45m
Sun 11/16:30 am -
1 stop7h 10m
Deal found 9/25![Southwest logo]()
$242
This Alaska Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/173:32 pm -
Nonstop1h 33m
Sun 10/185:45 pm -
Nonstop1h 40m
Deal found 9/26![Alaska Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:10 pm -
1 stop7h 05m
Fri 11/64:00 pm -
2 stops6h 45m
Deal found 9/26![Southwest logo]()
$248
This Southwest deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/64:10 pm -
2 stops6h 50m
Sun 11/86:30 am -
1 stop7h 10m
Deal found 9/29![Southwest logo]()
$252
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 September 30, 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 September 30, 2026.
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/174:49 pm -
1 stop5h 22m
Sun 10/256:00 am -
1 stop4h 41m
Deal found 9/25![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/273:32 pm -
Nonstop1h 33m
Fri 10/305:45 pm -
Nonstop1h 40m
Deal found 9/28![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/163:10 pm -
2 stops6h 35m
Mon 10/194:25 pm -
2 stops6h 55m
Deal found 9/28![Southwest logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/203:32 pm -
Nonstop1h 33m
Thu 10/225:45 pm -
Nonstop1h 40m
Deal found 9/25![Alaska Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:49 pm -
1 stop7h 06m
Thu 10/226:00 am -
1 stop4h 41m
Deal found 9/25![Delta logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/213:32 pm -
Nonstop1h 33m
Fri 10/235:45 pm -
Nonstop1h 40m
Deal found 9/25![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:30 pm -
2 stops8h 45m
Sun 11/14:00 pm -
2 stops6h 40m
Deal found 9/25![Southwest logo]()
$277
This Delta deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/74:49 pm -
1 stop5h 22m
Mon 11/96:00 am -
1 stop4h 43m
Deal found 9/27![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/53:10 pm -
1 stop3h 20m
Mon 11/94:00 pm -
2 stops6h 45m
Deal found 9/25![Southwest logo]()
$303
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/711:21 am -
1 stop5h 02m
Sun 11/86:00 am -
1 stop4h 41m
Deal found 9/25![Delta logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:32 pm -
Nonstop1h 33m
Tue 11/36:00 am -
1 stop17h 08m
Deal found 9/29![Alaska Airlines logo]()
$325
Last-minute flights from Santa Rosa to OntarioDiscover last-minute flight deals from Santa Rosa to Ontario. Data last updated September 30, 2026 and is based on user searches.
Discover last-minute flight deals from Santa Rosa to Ontario. Data last updated September 30, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/174:49 pm -
1 stop5h 22m
Wed 10/219:45 am -
1 stop6h 20m
Deal found 9/26![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/173:32 pm -
Nonstop1h 33m
Sun 10/185:45 pm -
Nonstop1h 40m
Deal found 9/26![Alaska Airlines logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/193:32 pm -
Nonstop1h 33m
Tue 10/205:45 pm -
Nonstop1h 40m
Deal found 9/28![Alaska Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2111:21 am -
1 stop5h 02m
Sun 10/256:00 am -
1 stop4h 41m
Deal found 9/26![Delta logo]()
$258
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:00 am -
2 stops7h 15m
Mon 10/264:25 pm -
2 stops6h 55m
Deal found 9/28![Southwest logo]()
$187
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/224:49 pm -
1 stop7h 06m
Mon 10/266:00 am -
1 stop4h 41m
Deal found 9/25![Delta logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/233:32 pm -
Nonstop1h 33m
Mon 10/265:45 pm -
Nonstop1h 40m
Deal found 9/29![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/234:49 pm -
1 stop7h 06m
Mon 10/266:00 am -
1 stop4h 41m
Deal found 9/29![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:30 pm -
2 stops8h 45m
Sun 11/16:30 am -
1 stop7h 10m
Deal found 9/25![Southwest logo]()
$242
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3011:21 am -
1 stop5h 02m
Sun 11/16:00 am -
1 stop4h 41m
Deal found 9/29![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:10 pm -
1 stop7h 05m
Fri 11/64:00 pm -
2 stops6h 45m
Deal found 9/26![Southwest logo]()
$248
This Delta deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:49 pm -
1 stop7h 06m
Mon 11/26:00 am -
1 stop4h 41m
Deal found 9/28![Delta logo]()
$257
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 September 30, 2026.
Search for one-way flight options from Santa Rosa to Ontario. Find affordable one-way fares based on user searches. Data last updated September 30, 2026.
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:50 pm -
2 stops7h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Southwest logo]()
$94
This Expedia deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/223:32 pm -
Nonstop1h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Alaska Airlines logo]()
$108
This Priceline deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/263:32 pm -
Nonstop1h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Alaska Airlines logo]()
$109
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/174:49 pm -
1 stop5h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Delta logo]()
$119
This Delta deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/194:49 pm -
1 stop7h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Delta logo]()
$129
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/233:10 pm -
1 stop3h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Southwest logo]()
$144
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/223:10 pm -
1 stop6h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Southwest logo]()
$149
This Alaska Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/183:32 pm -
Nonstop1h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Alaska Airlines logo]()
$169
This Delta deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals ”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3011:21 am -
1 stop5h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Delta logo]()
$170
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/211:21 am -
1 stop5h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Delta logo]()
$179
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:49 pm -
1 stop7h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Delta logo]()
$180
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 September 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $157 (Alaska Airlines) |
One-way from | $94 (Southwest) |
Popular in | December |
Cheapest in | October |
Average price | $227 |
Good round-trip deal | $168 or less |
Good one-way deal | $138 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 September 30, 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
Sat 10/24
3:32 pm-5:05 pm
Nonstop1h 33m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$109
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sun 11/22
3:10 pm-10:00 pm
1 stop6h 50m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$149
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 10/17
4:49 pm-10:11 pm
1 stop5h 22m
Ontario
Sun 10/25
6:00 am-10:41 am
1 stop4h 41m
$177
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 10/17
4:49 pm-10:11 pm
1 stop5h 22m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$209
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 10/27
3:32 pm-5:05 pm
Nonstop1h 33m
Ontario
Fri 10/30
5:45 pm-7:25 pm
Nonstop1h 40m
$217
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 10/20
3:32 pm-5:05 pm
Nonstop1h 33m
Ontario
Thu 10/22
5:45 pm-7:25 pm
Nonstop1h 40m
$217
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Wed 10/21
3:32 pm-5:05 pm
Nonstop1h 33m
Ontario
Fri 10/23
5:45 pm-7:25 pm
Nonstop1h 40m
$217
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Wed 10/21
4:49 pm-11:55 pm
1 stop7h 06m
Ontario
Thu 10/22
6:00 am-10:41 am
1 stop4h 41m
$237
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 10/6
3:32 pm-5:05 pm
Nonstop1h 33m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$249
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 12/29
4:50 pm-11:59 pm
1 stop7h 09m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$250
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Santa Rosa to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Santa Rosa to Ontario in September.
| 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 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, October is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $168). 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 September 30, 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 September 30, 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
Food
7.0
Entertainment
7.0
Overall
7.9
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Food
7.0
Entertainment
7.0
Overall
7.9
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Related info for your journey
Find useful and relevant information for your journey from Santa Rosa to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Santa Rosa to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
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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 September 30, 2026.
Santa Rosa and Ontario flights
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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 September 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$117 | Average$232 | FlexibilityNo cancel fee | On-time75% |