HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$130+ 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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
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.

Cheap 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 August 20, 2025.

Round-trip from

$199
(American Airlines)

One-way from

$130
(American Airlines)

Popular in

June

Cheapest in

December

Average price

$291
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. 27% potential increase in price ($78 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find 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 August 20, 2025.

This American Airlines deal was found by Cheapflights users on 8/18. 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 8/3012:59 pmSTS - ONT
1 stop4h 51mAmerican Airlines
Sun 8/319:00 amONT - STS
1 stop6h 47mAmerican Airlines
Deal found 8/18$199
This American Airlines deal was found by Cheapflights users on 8/19. 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 9/251:00 pmSTS - ONT
1 stop5h 12mAmerican Airlines
Sun 9/286:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/19$237
This American Airlines deal was found by Cheapflights users on 8/19. 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 9/41:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Tue 9/236:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/19$257
This American Airlines deal was found by Cheapflights users on 8/18. 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 9/212:59 pmSTS - ONT
1 stop4h 53mAmerican Airlines
Sat 9/66:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/18$277
This American Airlines deal was found by Cheapflights users on 8/18. 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 9/131:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Mon 9/156:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/18$287
This American Airlines deal was found by Cheapflights users on 8/18. 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 9/41:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Sun 9/76:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/18$307
This American Airlines deal was found by Cheapflights users on 8/19. 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 9/31:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Fri 9/56:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/19$316
This American Airlines deal was found by Cheapflights users on 8/19. 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 9/212:59 pmSTS - ONT
1 stop4h 53mAmerican Airlines
Fri 9/56:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/19$317
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 10/82:30 pmSTS - ONT
1 stop9h 33mAlaska Airlines
Sat 10/116:00 amONT - STS
1 stop7h 36mAlaska Airlines
Deal found 8/18$322
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Sun 9/71:00 pmSTS - ONT
1 stop5h 12mAmerican Airlines
Tue 9/96:10 amONT - STS
1 stop6h 19mAmerican Airlines
Deal found 8/19$327
This Alaska Airlines deal was found by Cheapflights users on 8/19. 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 9/177:00 amSTS - ONT
1 stop7h 12mAlaska Airlines
Fri 9/1911:39 amONT - STS
1 stop25h 57mAlaska Airlines
Deal found 8/19$332

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 August 20, 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

Sat 8/30

12:59 pm-5:50 pm

1 stop4h 51m

Ontario

Sun 8/31

9:00 am-3:47 pm

1 stop6h 47m

$199

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 9/25

1:00 pm-6:12 pm

1 stop5h 12m

Ontario

Sun 9/28

6:10 am-12:29 pm

1 stop6h 19m

$237

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 9/6

1:00 pm-6:16 pm

1 stop5h 16m

Ontario

Sat 9/13

6:10 am-12:29 pm

1 stop6h 19m

$257

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 9/4

1:00 pm-6:16 pm

1 stop5h 16m

Ontario

Tue 9/23

6:10 am-12:29 pm

1 stop6h 19m

$257

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Mon 9/22

4:19 pm-9:48 pm

1 stop5h 29m

Ontario

Tue 9/23

6:10 am-12:29 pm

1 stop6h 19m

$277

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 9/19

1:00 pm-6:16 pm

1 stop5h 16m

Ontario

Mon 9/22

6:10 am-12:27 pm

1 stop6h 17m

$277

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 9/2

12:59 pm-5:52 pm

1 stop4h 53m

Ontario

Sat 9/6

6:10 am-12:29 pm

1 stop6h 19m

$277

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 9/13

1:00 pm-6:16 pm

1 stop5h 16m

Ontario

Mon 9/15

6:10 am-12:29 pm

1 stop6h 19m

$287

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 9/26

1:00 pm-6:16 pm

1 stop5h 16m

Ontario

Sun 9/28

6:10 am-12:29 pm

1 stop6h 19m

$287

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Thu 9/4

1:00 pm-6:16 pm

1 stop5h 16m

Ontario

Sun 9/7

6:10 am-12:29 pm

1 stop6h 19m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 23 results
1
2
3

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, August is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $246). Flying from Santa Rosa to Ontario in March is currently the most expensive (average of $328). 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 August 20, 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 afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 72% 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 August 20, 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
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

PDX - SJC

They had no snacks and had to pay for the Wifi.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

PDX - SJC

They had no snacks and had to pay for the Wifi.
Avelo Airlines
7.5
Good
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

PDX - SJC

They had no snacks and had to pay for the Wifi.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

PDX - SJC

They had no snacks and had to pay for the Wifi.

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 American Airlines fly from Santa Rosa to Ontario in about 4h 51m. 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 72% 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, August is the cheapest month in which you can book a flight from Santa Rosa to Ontario (average of $246). Flying from Santa Rosa to Ontario in March is currently the most expensive (average of $328). 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

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 for Santa Rosa to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Las Vegas flights
San Francisco to Santa Ana flights
San Francisco to Los Angeles flights
Los Angeles to Las Vegas flights
Santa Ana to Las Vegas flights
Burbank to Las Vegas flights
Los Angeles to San Francisco flights
Oakland to Las Vegas flights
San Jose to Los Angeles flights
San Jose to Las Vegas flights
Los Angeles to San Jose flights
Santa Ana to San Francisco flights
San Francisco to Ontario flights
Ontario to San Francisco flights
San Francisco to San Diego flights
Oakland to Santa Ana flights
San Francisco to Burbank flights
Ontario to Las Vegas flights
Santa Ana to Oakland flights
Burbank to San Francisco flights
San Diego to Las Vegas flights
Los Angeles to Sacramento flights
San Jose to San Diego flights
Los Angeles to Reno flights
Sacramento to Los Angeles flights
Oakland to Los Angeles flights
Burbank to Oakland flights
Sacramento to Las Vegas flights
Los Angeles to Oakland flights
San Diego to San Francisco flights
Sacramento to San Diego flights
Santa Rosa to Las Vegas flights
Las Vegas to San Francisco flights
San Francisco to Palm Springs flights
Oakland to San Diego flights
Oakland to Burbank flights
San Jose to Santa Ana flights
Los Angeles to Santa Rosa flights
San Diego to San Jose flights
Fresno to Las Vegas flights
Sacramento to Santa Ana flights
San Jose to Burbank flights
Las Vegas to Los Angeles flights
Las Vegas to Santa Ana flights
San Francisco to Long Beach flights
Reno to Las Vegas flights
Santa Ana to San Jose flights
Stockton to Las Vegas flights
Long Beach to San Francisco flights
San Diego to Sacramento flights

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 August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$177Average$284FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$222Average$286FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.