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$99+ 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 3/20. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This American Airlines deal was found by Cheapflights users on 12/10. 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 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
Sat 1/39:53 amONT - STS
1 stop5h 58mAmerican Airlines
Deal found 12/10$493
This American Airlines deal was found by Cheapflights users on 12/11. 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.
Mon 12/154:26 pmSTS - ONT
1 stop5h 34mAmerican Airlines
Thu 12/186:20 amONT - STS
1 stop6h 09mAmerican Airlines
Deal found 12/11$526
This American Airlines deal was found by Cheapflights users on 12/9. 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.
Fri 12/1212:57 pmSTS - ONT
1 stop5h 22mAmerican Airlines
Sun 12/146:17 amONT - STS
1 stop6h 10mAmerican Airlines
Deal found 12/9$556
This American Airlines deal was found by Cheapflights users on 12/11. 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
Wed 12/176:17 amONT - STS
1 stop6h 10mAmerican Airlines
Deal found 12/11$633
This Kiwi.com deal was found by Cheapflights users on 12/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/162:21 pmSTS - ONT
1 stop28h 12mHawaiian Airlines
Tue 1/66:05 pmONT - STS
1 stop18h 17mHawaiian Airlines
Deal found 12/9$637
This Alaska Airlines deal was found by Cheapflights users on 12/9. 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.
Tue 12/162:21 pmSTS - ONT
1 stop20h 58mAlaska Airlines
Tue 1/612:48 pmONT - STS
2 stops10h 52mAlaska Airlines
Deal found 12/9$643
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1712:57 pmSTS - ONT
1 stop5h 22mAmerican Airlines
Sat 12/206:15 amONT - STS
1 stop6h 14mAmerican Airlines
Deal found 12/10$689

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 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$137
(Alaska Airlines)

One-way from

$99
(Alaska Airlines)

Popular in

October

Cheapest in

December

Average price

$69

Good round-trip deal

$207 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. 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
Price to beat on a round-trip 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 December 12, 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

Wed 3/18

3:45 pm-5:12 pm

Nonstop1h 27m

Ontario

Wed 3/25

1:30 pm-3:01 pm

Nonstop1h 31m

$137

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 4/10

3:45 pm-5:12 pm

Nonstop1h 27m

Ontario

Sun 4/12

1:30 pm-3:01 pm

Nonstop1h 31m

$157

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 4/25

3:45 pm-5:12 pm

Nonstop1h 27m

Ontario

Mon 5/4

1:30 pm-3:01 pm

Nonstop1h 31m

$157

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 3/28

3:45 pm-5:12 pm

Nonstop1h 27m

Ontario

Wed 4/1

1:30 pm-3:01 pm

Nonstop1h 31m

$157

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 4/4

3:45 pm-5:12 pm

Nonstop1h 27m

Ontario

Mon 4/6

1:30 pm-3:01 pm

Nonstop1h 31m

$157

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 3/21

3:45 pm-5:12 pm

Nonstop1h 27m

Ontario

Sun 3/22

1:30 pm-3:01 pm

Nonstop1h 31m

$187

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 1/16

9:33 pm-8:36 pm

1 stop23h 03m

Ontario

Sun 1/18

6:00 am-11:59 pm

1 stop17h 59m

$204

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 3/27

3:45 pm-5:12 pm

Nonstop1h 27m

$99

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 3/20

3:45 pm-5:12 pm

Nonstop1h 27m

$99

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 1/24

11:15 am-10:59 am

1 stop23h 44m

$123

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 17 results
1
2

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 12, 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 65% on airfare.

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 12, 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
11,432 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
11,432 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
11,432 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
11,049 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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 1h 27m. The time it takes to get you to your destination is usually consistent. The distance between Santa Rosa and Ontario is about 423 mi. Generally, flights for this route are nonstop.

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

    Avelo Airlines, at $55, 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 83% lower than the current average price of a flight leaving 3 months from now.

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

    Looking at all options, your cheapest flight can be booked for $117. While the most popular route (Santa Rosa Sonoma County - Ontario) can be booked for $157 on average, our data indicates $237 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, 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 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$55Average$81FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$117Average$357FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$222Average$299FlexibilityNo cancel feeOn-time71%

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