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

View $159 flight on Tue, Nov 11, 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.

Hawaiian Airlines
Sat, Oct 18 - Tue, Oct 21
STL
St. Louis
STS
Santa Rosa
$318 Roundtrip, found 22 hours ago
$318
Roundtrip
found 22 hours ago
Select Hawaiian Airlines flight, departing Sat, Oct 18 from St. Louis to Santa Rosa, returning Tue, Oct 21, priced at $318 found 22 hours ago
Alaska Airlines
Sat, Sep 27 - Sat, Oct 4
STL
St. Louis
STS
Santa Rosa
$332 Roundtrip, found 1 hour ago
$332
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Sat, Sep 27 from St. Louis to Santa Rosa, returning Sat, Oct 4, priced at $332 found 1 hour ago
Hawaiian Airlines
Sat, Oct 18 - Thu, Oct 23
STL
St. Louis
STS
Santa Rosa
$332 Roundtrip, found 22 hours ago
$332
Roundtrip
found 22 hours ago
Select Hawaiian Airlines flight, departing Sat, Oct 18 from St. Louis to Santa Rosa, returning Thu, Oct 23, priced at $332 found 22 hours ago
Hawaiian Airlines
Thu, Oct 16 - Tue, Oct 21
STL
St. Louis
STS
Santa Rosa
$338 Roundtrip, found 22 hours ago
$338
Roundtrip
found 22 hours ago
Select Hawaiian Airlines flight, departing Thu, Oct 16 from St. Louis to Santa Rosa, returning Tue, Oct 21, priced at $338 found 22 hours ago
Hawaiian Airlines
Wed, Oct 15 - Tue, Oct 21
STL
St. Louis
STS
Santa Rosa
$340 Roundtrip, found 22 hours ago
$340
Roundtrip
found 22 hours ago
Select Hawaiian Airlines flight, departing Wed, Oct 15 from St. Louis to Santa Rosa, returning Tue, Oct 21, priced at $340 found 22 hours ago
Hawaiian Airlines
Mon, Oct 20 - Thu, Oct 23
STL
St. Louis
STS
Santa Rosa
$346 Roundtrip, found 22 hours ago
$346
Roundtrip
found 22 hours ago
Select Hawaiian Airlines flight, departing Mon, Oct 20 from St. Louis to Santa Rosa, returning Thu, Oct 23, priced at $346 found 22 hours ago
Hawaiian Airlines
Wed, Oct 22 - Wed, Oct 29
STL
St. Louis
STS
Santa Rosa
$350 Roundtrip, found 6 days ago
$350
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Wed, Oct 22 from St. Louis to Santa Rosa, returning Wed, Oct 29, priced at $350 found 6 days ago
Hawaiian Airlines
Thu, Oct 16 - Thu, Oct 23
STL
St. Louis
STS
Santa Rosa
$352 Roundtrip, found 22 hours ago
$352
Roundtrip
found 22 hours ago
Select Hawaiian Airlines flight, departing Thu, Oct 16 from St. Louis to Santa Rosa, returning Thu, Oct 23, priced at $352 found 22 hours ago
Hawaiian Airlines
Wed, Oct 15 - Thu, Oct 23
STL
St. Louis
STS
Santa Rosa
$354 Roundtrip, found 22 hours ago
$354
Roundtrip
found 22 hours ago
Select Hawaiian Airlines flight, departing Wed, Oct 15 from St. Louis to Santa Rosa, returning Thu, Oct 23, priced at $354 found 22 hours ago
American Airlines
Wed, Aug 27 - Wed, Sep 3
STL
St. Louis
STS
Santa Rosa
$489 Roundtrip, found 2 days ago
$489
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Aug 27 from St. Louis to Santa Rosa, returning Wed, Sep 3, priced at $489 found 2 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 $475
STS
Sonoma County
CheapestClosest
Average driving time to city center10 min
Flights from $475
Flights from St. Louis (STL) to Santa Rosa (STS)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Sonoma County
Airlines serving
Alaska Airlines, American Airlines, Hawaiian Airlines
Roundtrip price
$314
Distance
1741 mi

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 October. 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.

 

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 October 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.

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*Available to One Key members.