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$79 Cheap Flights from Ontario Intl. Airport (ONT) to Santa Rosa (STS)

View $79 flight on Sat, Nov 14, 2026Opens in a new window

Popular airlines from Ontario Intl. Airport (ONT) to Santa Rosa, CA (STS-Sonoma County)

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Cheap Flights from Ontario Intl. Airport to Santa Rosa (ONT-STS)

Prices were available within the past 7 days and start at $79 for one-way flights and $151 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Sep 22 - Tue, Sep 29
ONT
Ontario
STS
Santa Rosa
$151 Roundtrip, found 6 days ago
$151
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Tue, Sep 22 from Ontario to Santa Rosa, returning Tue, Sep 29, priced at $151 found 6 days ago
Alaska Airlines
Wed, Oct 7 - Tue, Oct 13
ONT
Ontario
STS
Santa Rosa
$157 Roundtrip, found 3 hours ago
$157
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Wed, Oct 7 from Ontario to Santa Rosa, returning Tue, Oct 13, priced at $157 found 3 hours ago
American Airlines
Thu, Jan 7 - Sat, Jan 9
ONT
Ontario
STS
Santa Rosa
$159 Roundtrip, found 20 hours ago
$159
Roundtrip
found 20 hours ago
Select American Airlines flight, departing Thu, Jan 7 from Ontario to Santa Rosa, returning Sat, Jan 9, priced at $159 found 20 hours ago
Southwest Airlines
Sat, Nov 14 - Mon, Nov 16
ONT
Ontario
STS
Santa Rosa
$162 Roundtrip, found 5 hours ago
$162
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Sat, Nov 14 from Ontario to Santa Rosa, returning Mon, Nov 16, priced at $162 found 5 hours ago
American Airlines
Sat, Nov 14 - Mon, Nov 16
ONT
Ontario
STS
Santa Rosa
$163 Roundtrip, found 5 hours ago
$163
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Sat, Nov 14 from Ontario to Santa Rosa, returning Mon, Nov 16, priced at $163 found 5 hours ago
Alaska Airlines
Fri, Oct 23 - Mon, Oct 26
ONT
Ontario
STS
Santa Rosa
$166 Roundtrip, found 4 days ago
$166
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Fri, Oct 23 from Ontario to Santa Rosa, returning Mon, Oct 26, priced at $166 found 4 days ago
Southwest Airlines
Wed, Oct 7 - Tue, Oct 13
ONT
Ontario
STS
Santa Rosa
$167 Roundtrip, found 3 hours ago
$167
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Wed, Oct 7 from Ontario to Santa Rosa, returning Tue, Oct 13, priced at $167 found 3 hours ago
Southwest Airlines
Wed, Nov 4 - Sat, Nov 7
ONT
Ontario
STS
Santa Rosa
$169 Roundtrip, found 12 hours ago
$169
Roundtrip
found 12 hours ago
Select Southwest Airlines flight, departing Wed, Nov 4 from Ontario to Santa Rosa, returning Sat, Nov 7, priced at $169 found 12 hours ago
Southwest Airlines
Tue, Nov 3 - Fri, Nov 6
ONT
Ontario
STS
Santa Rosa
$172 Roundtrip, found 1 day ago
$172
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Nov 3 from Ontario to Santa Rosa, returning Fri, Nov 6, priced at $172 found 1 day ago
Delta
Sun, Oct 18 - Sat, Oct 24
ONT
Ontario
STS
Santa Rosa
$177 Roundtrip, found 2 days ago
$177
Roundtrip
found 2 days ago
Select Delta flight, departing Sun, Oct 18 from Ontario to Santa Rosa, returning Sat, Oct 24, priced at $177 found 2 days ago

Find the cheapest month to fly from Ontario (ONT) to Santa Rosa (STS)

April is typically the cheapest month to fly

From $117 - $217 per traveler.

What you need to know for your flight from Ontario Intl. Airport to Sonoma County

Ontario (ONT) to Santa Rosa (STS) at a glance

Embark on a journey from Ontario (ONT) to Santa Rosa (STS) with a selection of airlines catering to this domestic short-haul route. Discover various options for flights from Ontario to Santa Rosa, allowing you to find an itinerary that aligns with your budget and schedule as you venture through Santa Rosa's renowned attractions and neighborhoods. Get ready to explore key details about your travel from Los Angeles - Ontario International Airport to Sonoma County Airport.

  • Fastest flight duration: around 2 hours non-stop
  • Route distance: roughly 400 miles (645 km)
  • Flights per week: around 7 departures on average
  • Typical fares (one-way): economy tickets often range from $60–$320, depending on seasonality and how far ahead you book

Flights from Los Angeles - Ontario International Airport (ONT) to Sonoma County Airport (STS)

According to recent traveler bookings, the top airlines flying from Ontario to Santa Rosa are favored for their non-stop and one-stop options. Popular layover spots include Sky Harbor International Airport (PHX), with a layover of approximately 2 hours and 30 minutes, and Seattle-Tacoma International Airport (SEA), which has a layover of about 2 hours and 15 minutes. This variety allows you to balance price, total travel time, and cabin class to create your ideal travel itinerary.

  • American Airlines: This comprehensive carrier provides one-stop service, with one-way ticket prices generally falling between $125 and $300. It represents about 52% of departures along this route, featuring an in-flight duration of 3 hours and 30 minutes, totaling approximately 6 hours and 15 minutes when factoring in layover time.
  • Alaska Airlines: Another full-service option, Alaska Airlines offers both non-stop and one-stop flights, with one-way fares typically ranging from $60 to $325. It accounts for nearly 48% of departures on this route, with non-stop flights usually taking around 2 hours.

Travelers flying from Ontario to Santa Rosa can enhance their journey by upgrading to first class with Alaska Airlines, which provides exceptional service on this route.

Alternative route from Ontario (ONT) to Santa Rosa (STS)

  • Orange County to Santa Rosa (SNA-STS): John Wayne Airport (SNA) is located roughly 31 miles from Los Angeles - Ontario International Airport (ONT). One-way economy fares on this route generally fall between $90 and $335, influenced by the season and the timing of your booking. Travelers can choose from both non-stop and one-stop flight options. Major airlines servicing this route include Alaska Airlines and Hawaiian Airlines. Additionally, business and first class service options are also offered.

How to find the best prices for flights from Ontario (ONT) to Santa Rosa (STS)

Getting some of the best deals on flights from Ontario to Santa Rosa is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually found when booking 2-8 weeks in advance, which coincides with when most travelers make their reservations. Departures in the afternoon, between 12 PM and 6 PM, tend to offer lower prices and are also the most popular times to fly. Additionally, flying on Wednesday generally provides cheaper options, while Friday remains the busiest travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.* Find Santa Rosa hotel and flight deals.
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Sonoma County Airport from Los Angeles - Ontario International Airport

Santa Rosa welcomes travelers from Ontario with a range of transport options based on price, convenience, and proximity. Santa Rosa city center is approximately a 10-minute drive (covering about 9 miles) from Sonoma County Airport, depending on traffic. Here's how to reach Santa Rosa efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Santa Rosa, with options including free hotel shuttles and private rides, which can be arranged in advance with your hotel.
  • Car rental: Renting a car from Sonoma County Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Sonoma County Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Sonoma County Airport, Santa Rosa Station, a train station, is located about 7.6 miles away by car.

Frequently asked questions

How much does a flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) cost?
You can find cheap one-way flights from $79 and cheap return flights from $151 Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) with Expedia. One-way flights usually range from $245 to $1160, and return flights typically cost between $307 and $1013. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
April is the cheapest month to fly from Ontario, CA (ONT) to Santa Rosa, CA (STS), with average return fares around $306. This price is about 23% lower than the average fare for the year, as demand is generally lower in spring. Other economical months to fly include May and December.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
Enter ONT to STS and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
Alaska Airlines is one of the cheapest airlines offering nonstop flights from Ontario, CA (ONT) to Santa Rosa, CA (STS), with round-trip tickets starting from around $127. This is a great option for a quick trip. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
To find a cheap flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
The best airline to fly with from Ontario, CA (ONT) to Santa Rosa, CA (STS) will differ from traveler to traveler. If you like to fly early, Alaska Airlines offers early morning flights. If price is the most important factor, Alaska Airlines typically offers the lowest fares. WN offers the most daily flights from ONT to STS, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
The best time to fly from Ontario, CA (ONT) to Santa Rosa, CA (STS) is in April or May, with average return flight prices around $306. These months are popular for travelers, providing a great combination of good weather and affordable fares.*Prices based on flights available on Expedia in the last year.
What is the earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
The earliest flight from Los Angeles - Ontario International Airport (ONT) to Sonoma County Airport (STS) typically departs at around 12:55 AM, operated by American Airlines. This seasonal service is active in September, allowing you to start your day early in Santa Rosa. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
The most popular departure times for flights from Ontario, CA (ONT) to Santa Rosa, CA (STS) are between 9am and noon. About 27% of passengers prefer this time window. Many major carriers, including American Airlines, Southwest Airlines, and Alaska Airlines, offer flights during this window. This timing works well because it allows you to start your day early and arrive in Santa Rosa with plenty of time to explore.
How long does it take to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
Flying from ONT to STS with a connection usually takes about 6 hours, traveling roughly 423 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
First class seats are offered on the ONT to STS route with American Airlines.
How do I earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) flight with Expedia?
It's easy to earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Santa Rosa from Los Angeles - Ontario Intl. (ONT)?
From Los Angeles - Ontario Intl. (ONT), you can fly into Sonoma County (STS) to reach Santa Rosa. Some flights may connect through major hubs like San Francisco Intl. (SFO), Denver Intl. (DEN), Oakland Intl. (OAK) before reaching Santa Rosa. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) at the last minute?
Typically, booking a last minute flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) flight and hotel package?
Securing a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County)?
If you booked your Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Santa Rosa, CA (STS-Sonoma County) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Ontario Intl. Airport
Destination airport
Sonoma County
Airlines serving
Alaska Airlines, American Airlines, Delta, Southwest Airlines
Roundtrip price
$150
Distance
422 mi
Average flight time
1 hour 40 mins

Book with confidence

Ontario Intl. Airport to Santa Rosa Flights

The cheapest times to fly from Ontario Intl. Airport to Santa Rosa

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario Intl. Airport to Santa Rosa are during the month of September. You can find some of the cheapest flights from Ontario Intl. Airport to Santa Rosa with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario Intl. Airport to Santa Rosa

Sunday is one of the best days to book for cheap flights from Ontario Intl. Airport to Santa Rosa: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Ontario Intl. Airport to Santa Rosa

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario Intl. Airport to Santa Rosa in 2026. You can also book with separate airlines for your outbound and return journeys, from $79 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario Intl. Airport to Santa Rosa flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario Intl. Airport to Santa Rosa airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Ontario Intl. Airport to Santa Rosa Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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