$137 Cheap Flights from Santa Rosa (STS) to Denver (DEN)

View $137 flight on Wed, Jun 4, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from Santa Rosa to Denver (STS-DEN)

Prices were available within the past 7 days and start at $137 for one-way flights and $305 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, Jun 3 - Sat, Jun 7
STS
Santa Rosa
DEN
Denver
$305 Roundtrip, found 4 hours ago
$305
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Tue, Jun 3 from Santa Rosa to Denver, returning Sat, Jun 7, priced at $305 found 4 hours ago
Alaska Airlines
Tue, Jun 3 - Mon, Jun 9
STS
Santa Rosa
DEN
Denver
$315 Roundtrip, found 4 hours ago
$315
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Tue, Jun 3 from Santa Rosa to Denver, returning Mon, Jun 9, priced at $315 found 4 hours ago
Hawaiian Airlines
Wed, May 28 - Sat, May 31
STS
Santa Rosa
DEN
Denver
$326 Roundtrip, found 6 days ago
$326
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Wed, May 28 from Santa Rosa to Denver, returning Sat, May 31, priced at $326 found 6 days ago
Alaska Airlines
Tue, Jun 3 - Fri, Jun 6
STS
Santa Rosa
DEN
Denver
$328 Roundtrip, found 4 hours ago
$328
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Tue, Jun 3 from Santa Rosa to Denver, returning Fri, Jun 6, priced at $328 found 4 hours ago
Hawaiian Airlines
Wed, May 28 - Wed, Jun 11
STS
Santa Rosa
DEN
Denver
$329 Roundtrip, found 6 days ago
$329
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Wed, May 28 from Santa Rosa to Denver, returning Wed, Jun 11, priced at $329 found 6 days ago
Alaska Airlines
Wed, May 21 - Wed, May 28
STS
Santa Rosa
DEN
Denver
$330 Roundtrip, found 4 days ago
$330
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, May 21 from Santa Rosa to Denver, returning Wed, May 28, priced at $330 found 4 days ago
Alaska Airlines
Sat, May 24 - Tue, Jun 3
STS
Santa Rosa
DEN
Denver
$331 Roundtrip, found 6 days ago
$331
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Sat, May 24 from Santa Rosa to Denver, returning Tue, Jun 3, priced at $331 found 6 days ago
Alaska Airlines
Sat, Jun 7 - Tue, Jun 10
STS
Santa Rosa
DEN
Denver
$336 Roundtrip, found 4 hours ago
$336
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Sat, Jun 7 from Santa Rosa to Denver, returning Tue, Jun 10, priced at $336 found 4 hours ago
Hawaiian Airlines
Thu, Jun 5 - Tue, Jun 10
STS
Santa Rosa
DEN
Denver
$339 Roundtrip, found 4 hours ago
$339
Roundtrip
found 4 hours ago
Select Hawaiian Airlines flight, departing Thu, Jun 5 from Santa Rosa to Denver, returning Tue, Jun 10, priced at $339 found 4 hours ago
American Airlines
Sat, May 24 - Tue, May 27
STS
Santa Rosa
DEN
Denver
$382 Roundtrip, found 2 hours ago
$382
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, May 24 from Santa Rosa to Denver, returning Tue, May 27, priced at $382 found 2 hours ago

Frequently asked questions

How much does a flight from Sonoma County Airport (STS) to Denver Intl. Airport (DEN) cost?
Discover the latest flight deals from STS to DEN by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from STS to DEN?
The cheapest flights from STS to DEN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from STS to DEN?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from STS to DEN. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Sonoma County Airport (STS) to Denver Intl. Airport (DEN)?
There aren’t any daily nonstop flights from Sonoma County Airport (STS) to Denver Intl. Airport (DEN). But you can opt for flights with layovers. Filter your search results on Expedia to include one or more stops, and you’ll be cruising above the clouds before you know it.
What day of the week has the most flights from STS to DEN?
Generally you’ll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can vary based on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from STS to DEN?
United Airlines has the best track record for on-time direct flights from Sonoma County Airport (STS) to Denver Intl. Airport (DEN), with an on-time score of 81%. Use the Expedia App to see your journey status before you go and get real-time alerts about any trip changes.
What is the best time to fly from Sonoma County Airport (STS) to Denver Intl. Airport (DEN)?
To touch down at Denver Intl. Airport (DEN) on schedule, select a flight that leaves from Sonoma County Airport (STS) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Denver Intl. Airport (DEN) last-minute?
Waiting until just before your departure to book a flight from STS to DEN generally means paying more. Although you may find some last-minute offers, they’re not always guaranteed. Be flexible with your itinerary for a better chance of getting a bargain.
Is it cheaper to book a STS to DEN flight and hotel package?
Compared with arranging hotels and flights separately, booking a STS to DEN flight and hotel package with Expedia could result in significant savings. What’s more, having everything in one place will take the stress out of planning your trip. Just pick your flights and choose from our wide range of hotels, then personalize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Sonoma County Airport (STS) to Denver Intl. Airport (DEN)?
In most cases, you’re able to cancel or reschedule your STS to DEN flight. However, there may be additional fees, especially if you made your booking over 24 hours ago. Check your itinerary for the airline’s fees and rules on flight changes, or if you want more details, visit our Customer Service portal.
*Available to One Key members.