HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$124+ 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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$223
(American Airlines)

One-way from

$124
(American Airlines)

Popular in

June

Cheapest in

December

Average price

$306
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. 31% potential increase in price ($90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/10. 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.
Sat 7/54:16 pmSTS - ONT
1 stop5h 22mAmerican Airlines
Fri 7/116:15 amONT - STS
1 stop6h 16mAmerican Airlines
Deal found 6/10$223
This Alaska Airlines deal was found by Cheapflights users on 6/12. 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 8/198:01 pmSTS - ONT
1 stop14h 43mAlaska Airlines
Tue 8/2611:39 amONT - STS
1 stop8h 29mAlaska Airlines
Deal found 6/12$343
This Hawaiian Airlines deal was found by Cheapflights users on 6/12. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2011:54 amSTS - ONT
1 stop5h 06mHawaiian Airlines
Sun 8/2410:06 amONT - STS
1 stop6h 08mHawaiian Airlines
Deal found 6/12$1,367

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 June 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

Sat 7/5

4:16 pm-9:38 pm

1 stop5h 22m

Ontario

Fri 7/11

6:15 am-12:31 pm

1 stop6h 16m

$223

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 8/19

8:01 pm-10:44 am

1 stop14h 43m

Ontario

Tue 8/26

11:39 am-8:08 pm

1 stop8h 29m

$343

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Wed 8/20

11:54 am-5:00 pm

1 stop5h 06m

Ontario

Sun 8/24

10:06 am-4:14 pm

1 stop6h 08m

$1,367

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Wed 7/9

4:16 pm-9:38 pm

1 stop5h 22m

$124

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Wed 8/13

6:47 pm-11:59 pm

1 stop5h 12m

$172

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 6/24

6:47 pm-11:59 pm

1 stop5h 12m

$281

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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 June 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 afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 72% on airfare.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Hawaiian Airlines and American Airlines from Santa Rosa to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    American Airlines, at $223, was found to be the cheapest airline from Santa Rosa to Ontario.Alternate airlines to your destination round-trip include Alaska Airlines and Hawaiian Airlines.

  • What are the cheapest airlines to fly from Santa Rosa to Ontario one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $124. Alaska Airlines flights start at $172 while deals on Hawaiian Airlines start at $281 one-way.

  • 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.
Los Angeles to San Francisco flights
San Francisco to Las Vegas flights
Los Angeles to Las Vegas flights
San Jose to Los Angeles flights
San Francisco to Los Angeles flights
Los Angeles to San Jose flights
Oakland to Santa Ana flights
Santa Ana to Las Vegas flights
Oakland to Las Vegas flights
Oakland to Los Angeles flights
Burbank to Las Vegas flights
Los Angeles to Oakland flights
San Jose to Las Vegas flights
Ontario to San Francisco flights
San Francisco to Santa Ana flights
Santa Ana to Oakland flights
San Francisco to Ontario flights
Santa Ana to San Francisco flights
San Jose to San Diego flights
Burbank to Oakland flights
San Francisco to San Diego flights
Los Angeles to Sacramento flights
Ontario to Las Vegas flights
Sacramento to Los Angeles flights
Oakland to Burbank flights
San Jose to Santa Ana flights
Burbank to San Francisco flights
Oakland to San Diego flights
Sacramento to Las Vegas flights
Los Angeles to Reno flights
Las Vegas to Los Angeles flights
Sacramento to San Diego flights
Santa Ana to San Jose flights
San Jose to Ontario flights
San Diego to San Francisco flights
San Diego to Las Vegas flights
San Francisco to Burbank flights
Ontario to San Jose flights
Stockton to Las Vegas flights
San Diego to San Jose flights
Burbank to Sacramento flights
Las Vegas to San Francisco flights
Santa Ana to Sacramento flights
San Diego to Sacramento flights
Sacramento to Santa Ana flights
San Francisco to Palm Springs flights
Ontario to Sacramento flights
Burbank to San Jose flights
Fresno to Las Vegas flights
Sacramento to Ontario 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$198Average$282FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$206Average$321FlexibilityNo cancel feeOn-time75%

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.