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Ontario

$118+ 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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This American Airlines deal was found by Cheapflights users on 12/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:21 pmSTS - ONT
1 stop5h 31mAmerican Airlines
Mon 1/59:53 amONT - STS
1 stop5h 58mAmerican Airlines
Deal found 12/17$426
This American Airlines deal was found by Cheapflights users on 12/16. 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.
Tue 12/1612:57 pmSTS - ONT
1 stop5h 22mAmerican Airlines
Tue 1/66:22 amONT - STS
1 stop6h 03mAmerican Airlines
Deal found 12/16$447
This American Airlines deal was found by Cheapflights users on 12/16. 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 12/3112:59 pmSTS - ONT
1 stop5h 29mAmerican Airlines
Sun 1/49:53 amONT - STS
1 stop5h 58mAmerican Airlines
Deal found 12/16$487
This Alaska Airlines deal was found by Cheapflights users on 12/17. 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.
Wed 12/318:17 pmSTS - ONT
1 stop20h 54mAlaska Airlines
Wed 1/77:00 amONT - STS
1 stop5h 22mAlaska Airlines
Deal found 12/17$552
This American Airlines deal was found by Cheapflights users on 12/16. 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.
Fri 12/1912:59 pmSTS - ONT
1 stop6h 09mAmerican Airlines
Mon 12/229:53 amONT - STS
1 stop5h 58mAmerican Airlines
Deal found 12/16$556
This Alaska Airlines deal was found by Cheapflights users on 12/17. 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.
Wed 12/318:17 pmSTS - ONT
1 stop20h 54mAlaska Airlines
Thu 1/86:00 amONT - STS
1 stop17h 59mAlaska Airlines
Deal found 12/17$592
This Alaska Airlines deal was found by Cheapflights users on 12/17. 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.
Thu 12/256:00 amSTS - ONT
2 stops17h 59mAlaska Airlines
Tue 1/66:05 pmONT - STS
1 stop18h 17mAlaska Airlines
Deal found 12/17$618
This Alaska Airlines deal was found by Cheapflights users on 12/17. 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 12/306:00 amSTS - ONT
1 stop9h 42mAlaska Airlines
Mon 1/56:05 pmONT - STS
2 stops19h 27mAlaska Airlines
Deal found 12/17$738
This American Airlines deal was found by Cheapflights users on 12/15. 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.
Fri 12/264:21 pmSTS - ONT
1 stop5h 31mAmerican Airlines
Mon 12/299:53 amONT - STS
1 stop5h 58mAmerican Airlines
Deal found 12/15$745

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$137
(Alaska Airlines)

One-way from

$118
(Alaska Airlines)

Popular in

October

Cheapest in

December

Average price

$69
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. 45% potential increase in price ($268 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 13% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 2025.
Use the filters below to find and compare flights from Santa Rosa to Ontario that are best for you.

Fly from

Santa Rosa

Fly to

Ontario

Route

Depart

Return

Price

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 3/17

7:57 pm-10:37 pm

1 stop26h 40m

Ontario

Tue 3/24

1:30 pm-3:01 pm

Nonstop1h 31m

$191

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 1/29

9:33 pm-3:08 pm

1 stop17h 35m

Ontario

Sun 2/1

6:00 am-11:59 pm

1 stop17h 59m

$224

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 1/16

9:33 pm-8:36 pm

1 stop23h 03m

Ontario

Sun 1/25

6:00 am-11:59 pm

1 stop17h 59m

$224

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 1/10

6:50 am-5:03 pm

1 stop10h 13m

Ontario

Sun 1/18

6:00 am-11:59 pm

1 stop17h 59m

$233

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Wed 1/28

6:50 am-1:06 pm

1 stop6h 16m

Ontario

Tue 2/3

11:53 am-10:35 am

1 stop22h 42m

$233

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 1/17

6:50 am-5:03 pm

1 stop10h 13m

Ontario

Sun 1/25

6:00 am-11:59 pm

1 stop17h 59m

$243

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sun 1/11

9:33 pm-10:59 am

1 stop13h 26m

Ontario

Sun 1/18

6:00 am-11:59 pm

1 stop17h 59m

$244

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 1/29

9:33 pm-7:16 pm

2 stops45h 43m

Ontario

Mon 2/2

6:00 am-11:59 pm

1 stop17h 59m

$253

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Wed 2/18

7:57 pm-11:32 pm

1 stop27h 35m

Ontario

Fri 2/20

6:08 pm-9:14 am

1 stop15h 06m

$263

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 1/30

9:33 pm-1:06 pm

2 stops15h 33m

Ontario

Sun 2/1

6:00 am-11:59 pm

1 stop17h 59m

$263

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 21 results
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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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Santa Rosa-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, February is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $19). Flying from Santa Rosa to Ontario in July is currently the most expensive (average of $57). 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 December 18, 2025.

One of the essential ways to save on airfare from Santa Rosa to Ontario is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 57% on airfare.

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 December 18, 2025.
Read reviews from past customers who have flown Alaska Airlines, Avelo 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
8.0
Very good
11,476 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,476 reviews
Alaska Airlines
8.0
Very good
11,476 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Avelo Airlines
7.5
Good
Alaska Airlines
8.0
Very good
11,476 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
11,054 reviews
Alaska Airlines
8.0
Very good
11,476 reviews

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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.

  • 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 fly from Santa Rosa to Ontario in about 26h 40m. The time it takes to get you to your destination can typically vary by up to . The distance between Santa Rosa and Ontario is about 423 mi.

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

    Avelo Airlines, at $57, was found to be the cheapest airline from Santa Rosa to Ontario.Alternate airlines to your destination round-trip include Alaska Airlines and American Airlines. Avelo Airlines is priced at 82% lower than the current average price of a flight leaving 3 months from now.

  • 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, February is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $19). Flying from Santa Rosa to Ontario in July is currently the most expensive (average of $57). 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.

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Top 3 airlines flying from Santa Rosa to Ontario

Discover the top 3 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$117Average$357FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$222Average$296FlexibilityNo cancel feeOn-time71%

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