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$80+ Cheap flights from Santa Rosa to Ontario (STS - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Aug 11 — Aug 181
Tue 8/11
Tue 8/18
1 adult, Economy
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Cheap flight deals from Santa Rosa to Ontario

Cheapest flights from Santa Rosa to Ontario
Explore the most affordable flight options available from Santa Rosa to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 12, 2026.

This SmartFares deal was found by Cheapflights users on 7/8. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:14 pm
STS
-
ONT
Nonstop1h 38m
Alaska Airlines
Sun 8/304:27 pm
ONT
-
STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/8$147
This Alaska Airlines deal was found by Cheapflights users on 7/7. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/282:09 pm
STS
-
ONT
Nonstop1h 38m
Alaska Airlines
Sun 8/304:27 pm
ONT
-
STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/7$157
This Booking.com deal was found by Cheapflights users on 7/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/182:09 pm
STS
-
ONT
Nonstop1h 38m
Alaska Airlines
Mon 9/214:27 pm
ONT
-
STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/7$158
This Delta deal was found by Cheapflights users on 7/8. 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.
Mon 11/94:55 pm
STS
-
ONT
1 stop6h 53m
Delta
Mon 11/166:00 am
ONT
-
STS
1 stop4h 39m
Delta
Deal found 7/8$159
This Southwest deal was found by Cheapflights users on 7/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:55 pm
STS
-
ONT
1 stop6h 50m
Southwest
Mon 8/248:30 am
ONT
-
STS
1 stop5h 50m
Southwest
Deal found 7/8$164
This Alaska Airlines deal was found by Cheapflights users on 7/10. 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 9/42:09 pm
STS
-
ONT
Nonstop1h 38m
Alaska Airlines
Sat 9/264:27 pm
ONT
-
STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/10$167
This Delta deal was found by Cheapflights users on 7/8. 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.
Sun 11/84:50 pm
STS
-
ONT
1 stop6h 56m
Delta
Wed 11/116:00 am
ONT
-
STS
1 stop4h 39m
Delta
Deal found 7/8$168
This Southwest deal was found by Cheapflights users on 7/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:00 am
STS
-
ONT
2 stops7h 35m
Southwest
Fri 9/114:00 pm
ONT
-
STS
2 stops6h 35m
Southwest
Deal found 7/9$169
This CheapOair deal was found by Cheapflights users on 7/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/113:02 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Mon 11/166:31 pm
ONT
-
STS
Nonstop1h 36m
Alaska Airlines
Deal found 7/8$170
This Southwest deal was found by Cheapflights users on 7/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
STS
-
ONT
2 stops8h 15m
Southwest
Sun 8/236:25 am
ONT
-
STS
1 stop7h 10m
Southwest
Deal found 7/9$173

Find flight deals from Santa Rosa to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Santa Rosa (STS) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$147
(SmartFares)

One-way from

$80
(Delta)

Popular in

October

Cheapest in

April

Average price

$287

Good round-trip deal

$227 or less

Good one-way deal

$173 or less
Provider with most accurate pricing for Santa Rosa Sonoma County-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Santa Rosa Sonoma County-Ontario flights.
Search Deals
From Santa Rosa Sonoma County to Ontario
Search Deals
One-way flight from Santa Rosa Sonoma County to Ontario
Search Deals
Highest demand for flights based on searches. 39% potential increase in price ($240 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Santa Rosa Sonoma County to Ontario.
Search Deals
Price to beat on a one-way flight from Santa Rosa Sonoma County to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Santa Rosa to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 12, 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

Price

Cheapest round-trip

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 9/12

2:09 pm-3:47 pm

Nonstop1h 38m

Ontario

Wed 9/16

4:27 pm-6:07 pm

Nonstop1h 40m

$157

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 8/22

6:00 am-2:15 pm

2 stops8h 15m

Ontario

Sun 8/23

6:25 am-1:35 pm

1 stop7h 10m

$173

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 8/25

1:40 pm-8:55 pm

1 stop7h 15m

Ontario

Sat 8/29

5:40 am-12:05 pm

1 stop6h 25m

$174
Quickest round-trip

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 8/7

4:35 pm-6:03 pm

Nonstop1h 28m

Ontario

Sun 8/9

6:43 pm-8:14 pm

Nonstop1h 31m

$227

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 7/28

4:35 pm-6:03 pm

Nonstop1h 28m

Ontario

Sun 8/2

6:43 pm-8:14 pm

Nonstop1h 31m

$227

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 7/31

4:35 pm-6:03 pm

Nonstop1h 28m

Ontario

Thu 8/6

6:43 pm-8:14 pm

Nonstop1h 31m

$227

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 7/31

4:35 pm-6:03 pm

Nonstop1h 28m

Ontario

Mon 8/3

6:43 pm-8:14 pm

Nonstop1h 31m

$227

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 8/21

2:55 pm-10:05 pm

2 stops7h 10m

Ontario

Sun 8/23

2:50 pm-11:35 pm

2 stops8h 45m

$287

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 7/24

4:35 pm-6:03 pm

Nonstop1h 28m

Ontario

Tue 7/28

6:43 pm-8:14 pm

Nonstop1h 31m

$287

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 8/29

7:03 am-5:10 pm

2 stops10h 07m

Ontario

Sun 8/30

4:27 pm-6:07 pm

Nonstop1h 40m

$300

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Santa Rosa to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Santa Rosa to Ontario in July.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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

What is the cheapest month to book a flight from Santa Rosa to Ontario?

Currently, April is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $197). Flying from Santa Rosa to Ontario in October is currently the most expensive (average of $756). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STS to ONT?

Find hourly flight availability from Santa Rosa to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 12, 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.

How much does it cost to fly round-trip from Santa Rosa to Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 12, 2026.
Read reviews from past customers who have flown Alaska Airlines and American Airlines from Santa Rosa to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,655 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Alaska Airlines
7.9
Good
12,655 reviews
Alaska Airlines
7.9
Good
12,655 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
American Airlines
7.1
Good
11,804 reviews
Alaska Airlines
7.9
Good
12,655 reviews

Food

7.1

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading

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.

  • What airports do I use to fly from Santa Rosa to Ontario?

    To fly from Santa Rosa to Ontario, you need to book a flight from Sonoma County (STS) to Ontario (ONT). Nonstop flights to Ontario from Santa Rosa Sonoma County take 1h 27m on average. When it comes time to book airfare, you have a few options: there is 1 outbound flight from Sonoma County to Ontario offered by 2 different airlines.

  • How popular is this Santa Rosa to Ontario flight route?

    Within the past month, 1 users have taken a look at flights from Santa Rosa Sonoma County to Ontario.

  • How long is the flight from Santa Rosa to Ontario?

    Airlines like Alaska Airlines and Southwest fly from Santa Rosa to Ontario in about 1h 38m. The time it takes to get you to your destination can typically vary by up to 6h 37m. The distance between Santa Rosa and Ontario is about 423 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Santa Rosa to Ontario round-trip?

    Alaska Airlines, at $117, was found to be the cheapest airline from Santa Rosa to Ontario. An alternate airline flying to your destination would be American Airlines. Alaska Airlines is priced at 68% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from Santa Rosa to Ontario?

    Before booking your flight to Ontario from Santa Rosa, check out the most reliable airlines to get you to your destination on time: Horizon Air (100%), Alaska Airlines (92%), SkyWest Airlines( 88%).

  • What are the cheapest flights from Santa Rosa to Ontario?

    Looking at all options, your cheapest flight can be booked for $143. While the most popular route (Santa Rosa Sonoma County - Ontario) can be booked for $157 on average, our data indicates $288 when flying from Santa Rosa to Ontario.

  • Can I find deals for flights from Santa Rosa to Ontario that include hotel bookings?

    Yes. In addition to deals on Santa Rosa to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Santa Rosa to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Santa Rosa to Ontario.

  • Can I find deals for business class flights from Santa Rosa to Ontario?

    Yes. Cheapflights offers flight deals from Santa Rosa to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Santa Rosa to Ontario?

    Currently, April is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $197). Flying from Santa Rosa to Ontario in October is currently the most expensive (average of $756). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 2 airlines flying from Santa Rosa to Ontario

Discover the top 2 airlines that operate flights from Santa Rosa to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$117Average$228FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$236Average$326FlexibilityNo cancel feeOn-time71%

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