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$144+ 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 8/1. Fares are subject to change and may not be available on all flights or dates of travel.
STS — ONT
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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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 30, 2025.

Round-trip from

$247
(American Airlines)

One-way from

$144
(American Airlines)

Popular in

June

Cheapest in

December

Average price

$306
From Santa Rosa Sonoma County to Ontario
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One-way flight from Santa Rosa Sonoma County to Ontario
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Highest demand for flights based on searches. 31% potential increase in price ($90 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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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 30, 2025.

This American Airlines deal was found by Cheapflights users on 6/30. 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 8/2212:59 pmSTS - ONT
1 stop4h 53mAmerican Airlines
Tue 8/266:17 amONT - STS
1 stop6h 12mAmerican Airlines
Deal found 6/30$247
This Alaska Airlines deal was found by Cheapflights users on 6/30. 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.
Sat 10/116:51 pmSTS - ONT
1 stop4h 58mAlaska Airlines
Tue 10/217:10 amONT - STS
1 stop25h 56mAlaska Airlines
Deal found 6/30$342

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 30, 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

Fri 8/22

12:59 pm-5:52 pm

1 stop4h 53m

Ontario

Tue 8/26

6:17 am-12:29 pm

1 stop6h 12m

$247

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Sat 10/11

6:51 pm-11:49 pm

1 stop4h 58m

Ontario

Tue 10/21

7:10 am-9:06 am

1 stop25h 56m

$342

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 8/1

4:16 pm-9:38 pm

1 stop5h 22m

$144

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Tue 7/29

11:11 am-12:15 am

2 stops13h 04m

$187

Santa RosaOntario

STS - ONT

STSONT

Santa Rosa Sonoma County

Fri 8/15

6:47 pm-11:59 pm

1 stop5h 12m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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 30, 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.

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 June 30, 2025.
Read reviews from past customers who have flown Alaska Airlines, Hawaiian 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

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
7.8
Good
2,533 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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

Overall

8.0

Food

7.1

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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 $247, was found to be the cheapest airline from Santa Rosa to Ontario. An alternate airline flying to your destination would be Alaska 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 $144. Alaska Airlines flights start at $187 while deals on Hawaiian Airlines start at $251 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.

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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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$57Average$81FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$177Average$284FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$198Average$282FlexibilityNo cancel feeOn-time71%

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