$186 Cheap Flights from Santa Rosa (STS) to St. Louis (STL)

View $186 flight on Tue, Oct 28, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $186 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, Oct 22 - Sat, Oct 25
STS
Santa Rosa
STL
St. Louis
$318 Roundtrip, found 1 day ago
$318
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Oct 22 from Santa Rosa to St. Louis, returning Sat, Oct 25, priced at $318 found 1 day ago
Alaska Airlines
Wed, Feb 11 - Wed, Feb 18
STS
Santa Rosa
STL
St. Louis
$339 Roundtrip, found 2 days ago
$339
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Feb 11 from Santa Rosa to St. Louis, returning Wed, Feb 18, priced at $339 found 2 days ago
Alaska Airlines
Wed, Oct 22 - Sat, Oct 25
STS
Santa Rosa
STL
St. Louis
$346 Roundtrip, found 1 day ago
$346
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Oct 22 from Santa Rosa to St. Louis, returning Sat, Oct 25, priced at $346 found 1 day ago
Alaska Airlines
Wed, Feb 11 - Wed, Feb 18
STS
Santa Rosa
STL
St. Louis
$348 Roundtrip, found 2 days ago
$348
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Feb 11 from Santa Rosa to St. Louis, returning Wed, Feb 18, priced at $348 found 2 days ago
Alaska Airlines
Thu, Dec 4 - Wed, Dec 10
STS
Santa Rosa
STL
St. Louis
$358 Roundtrip, found 3 days ago
$358
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Santa Rosa to St. Louis, returning Wed, Dec 10, priced at $358 found 3 days ago
Alaska Airlines
Sat, Oct 18 - Sat, Oct 25
STS
Santa Rosa
STL
St. Louis
$360 Roundtrip, found 1 day ago
$360
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sat, Oct 18 from Santa Rosa to St. Louis, returning Sat, Oct 25, priced at $360 found 1 day ago
Alaska Airlines
Thu, Dec 4 - Wed, Dec 10
STS
Santa Rosa
STL
St. Louis
$364 Roundtrip, found 3 days ago
$364
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Santa Rosa to St. Louis, returning Wed, Dec 10, priced at $364 found 3 days ago
Alaska Airlines
Thu, Dec 4 - Wed, Dec 10
STS
Santa Rosa
STL
St. Louis
$367 Roundtrip, found 3 days ago
$367
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Santa Rosa to St. Louis, returning Wed, Dec 10, priced at $367 found 3 days ago
Alaska Airlines
Wed, Oct 22 - Sat, Oct 25
STS
Santa Rosa
STL
St. Louis
$372 Roundtrip, found 1 day ago
$372
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Oct 22 from Santa Rosa to St. Louis, returning Sat, Oct 25, priced at $372 found 1 day ago
American Airlines
Thu, Oct 30 - Sun, Nov 2
STS
Santa Rosa
STL
St. Louis
$479 Roundtrip, found 1 hour ago
$479
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Thu, Oct 30 from Santa Rosa to St. Louis, returning Sun, Nov 2, priced at $479 found 1 hour ago

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $772
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $772

Frequently asked questions

How much does a flight from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $186 or cheap return flight from $318 from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL)?
October is the least expensive month to fly from STS to STL. Planning your trip for the off-season is often the key to finding better deals on flights.
What is the cheapest airline that flies from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STS to STL flight.
How many flights per day from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL)?
Nonstop flights from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STS to STL?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the risk of cancellations. Departures later than this are on average 22% more likely to be 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.
Is it cheaper to buy a plane ticket from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from STS to STL are generally more expensive. To lock in the lowest prices, start searching for flights ahead of time. That said, if your travel plans are flexible, it's possible to find a cheap fare just before your departure.
Is it cheaper to book a STS to STL flight and hotel package?
You'll generally save money by securing a STS to STL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. Once you've chosen your ideal accommodations and flights, you can add extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Sonoma County Airport (STS) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your STS to STL flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more details.

Travel information

Travel information

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

Book with confidence

Book with confidence

Santa Rosa to St. Louis Flights

The cheapest times to fly from Santa Rosa to St. Louis

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

 

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

Sunday is one of the best days to book for cheap flights from Santa Rosa to St. Louis: 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 Santa Rosa to St. Louis

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 Santa Rosa to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $186 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 Santa Rosa to St. Louis 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 Santa Rosa to St. Louis 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.

 

Santa Rosa to St. Louis Flights

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*Available to One Key members.