$159 Cheap Flights from St. Louis (STL) to Santa Rosa (STS)

View $159 flight on Wed, Dec 10, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Santa Rosa, CA (STS-Sonoma County)

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Cheap Flights from St. Louis to Santa Rosa (STL-STS)

Prices were available within the past 7 days and start at $159 for one-way flights and $318 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, Dec 10 - Sat, Dec 13
STL
St. Louis
STS
Santa Rosa
$318 Roundtrip, found 2 days ago
$318
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Dec 10 from St. Louis to Santa Rosa, returning Sat, Dec 13, priced at $318 found 2 days ago
Alaska Airlines
Wed, Dec 10 - Sat, Dec 13
STL
St. Louis
STS
Santa Rosa
$336 Roundtrip, found 2 days ago
$336
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Dec 10 from St. Louis to Santa Rosa, returning Sat, Dec 13, priced at $336 found 2 days ago
Alaska Airlines
Fri, Jan 9 - Tue, Jan 13
STL
St. Louis
STS
Santa Rosa
$339 Roundtrip, found 21 hours ago
$339
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Fri, Jan 9 from St. Louis to Santa Rosa, returning Tue, Jan 13, priced at $339 found 21 hours ago
Alaska Airlines
Fri, Jan 9 - Tue, Jan 13
STL
St. Louis
STS
Santa Rosa
$346 Roundtrip, found 21 hours ago
$346
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Fri, Jan 9 from St. Louis to Santa Rosa, returning Tue, Jan 13, priced at $346 found 21 hours ago
Alaska Airlines
Fri, Jan 9 - Tue, Jan 13
STL
St. Louis
STS
Santa Rosa
$349 Roundtrip, found 21 hours ago
$349
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Fri, Jan 9 from St. Louis to Santa Rosa, returning Tue, Jan 13, priced at $349 found 21 hours ago
Alaska Airlines
Wed, Dec 10 - Sat, Dec 13
STL
St. Louis
STS
Santa Rosa
$350 Roundtrip, found 2 days ago
$350
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Dec 10 from St. Louis to Santa Rosa, returning Sat, Dec 13, priced at $350 found 2 days ago
Alaska Airlines
Fri, Jan 9 - Tue, Jan 13
STL
St. Louis
STS
Santa Rosa
$355 Roundtrip, found 21 hours ago
$355
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Fri, Jan 9 from St. Louis to Santa Rosa, returning Tue, Jan 13, priced at $355 found 21 hours ago
Hawaiian Airlines
Thu, Dec 18 - Thu, Dec 25
STL
St. Louis
STS
Santa Rosa
$382 Roundtrip, found 4 days ago
$382
Roundtrip
found 4 days ago
Select Hawaiian Airlines flight, departing Thu, Dec 18 from St. Louis to Santa Rosa, returning Thu, Dec 25, priced at $382 found 4 days ago
American Airlines
Wed, Feb 11 - Sat, Feb 14
STL
St. Louis
STS
Santa Rosa
$389 Roundtrip, found 2 days ago
$389
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Feb 11 from St. Louis to Santa Rosa, returning Sat, Feb 14, priced at $389 found 2 days ago
Southwest Airlines
Thu, May 14 - Sun, May 17
STL
St. Louis
STS
Santa Rosa
$515 Roundtrip, found 3 days ago
$515
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Thu, May 14 from St. Louis to Santa Rosa, returning Sun, May 17, priced at $515 found 3 days ago

Alternative airports near Santa Rosa

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sonoma County STS. Cheapest and Closest option available. Average driving time to city center is 10 minutes. Flights from $621
STS
Sonoma County
CheapestClosest
Average driving time to city center10 min
Flights from $621

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS) cost?
Grab a cheap one-way flight from $159 or cheap return flight from $318 from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS)?
Flying in December can help you save, as it's the cheapest month for flights between STL and STS. You'll typically find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS)?
To find the cheapest airline flying from STL to STS, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS)?
There aren't any daily nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS). But you can choose flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from STL to STS?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS) route, aim to fly before 3 PM. Flights after this time have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Santa Rosa from Lambert-St. Louis Intl. Airport (STL)?
Browse your flight options from Lambert-St. Louis Intl. Airport (STL) to San Francisco Intl. Airport (SFO). This is the only Santa Rosa airport you can land at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS) last-minute?
Booking your ticket from STL to STS just before your journey is generally more expensive. But if you're flexible with your itinerary, you could score a cheap last-minute fare.
Is it cheaper to book a STL to STS flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to STS flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place takes the hassle out of travel planning. Just secure your flights and choose from our extensive range of hotels, then personalize your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Sonoma County Airport (STS)?
It's usually possible to reschedule or cancel your STL to STS flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Sonoma County
Airlines serving
Alaska Airlines, American Airlines
Roundtrip price
$318
Distance
1741 mi

Book with confidence

St. Louis to Santa Rosa Flights

The cheapest times to fly from St. Louis 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 St. Louis to Santa Rosa are during the month of December. You can find some of the cheapest flights from St. Louis to Santa Rosa with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Santa Rosa

Sunday is one of the best days to book for cheap flights from St. Louis 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 St. Louis 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 St. Louis to Santa Rosa in 2025. You can also book with separate airlines for your outbound and return journeys, from $159 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 St. Louis 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 St. Louis 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.

 

St. Louis to Santa Rosa Flights

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*Available to One Key members.