$99 Cheap Flights from Alamosa (ALS) to Denver (DEN)

View $99 flight on Thu, May 15, 2025Opens in a new window

Popular airlines from Alamosa, CO (ALS-San Luis Valley Regional) to Denver Intl. Airport (DEN)

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key
Find available prices by choosing your travel dates.

Cheap Flights from Alamosa to Denver (ALS-DEN)

Prices were available within the past 7 days and start at $99 for one-way flights and $198 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KEY LIME AIR DBA DENVER AIR CONNECTION
Wed, May 28 - Wed, Jun 4
ALS
Alamosa
DEN
Denver
$198 Roundtrip, found 3 hours ago
$198
Roundtrip
found 3 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Wed, May 28 from Alamosa to Denver, returning Wed, Jun 4, priced at $198 found 3 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Thu, May 15 - Wed, May 21
ALS
Alamosa
DEN
Denver
$208 Roundtrip, found 8 hours ago
$208
Roundtrip
found 8 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Thu, May 15 from Alamosa to Denver, returning Wed, May 21, priced at $208 found 8 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Thu, May 1 - Sat, May 17
ALS
Alamosa
DEN
Denver
$218 Roundtrip, found 5 hours ago
$218
Roundtrip
found 5 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Thu, May 1 from Alamosa to Denver, returning Sat, May 17, priced at $218 found 5 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Mon, Apr 28 - Sat, May 17
ALS
Alamosa
DEN
Denver
$228 Roundtrip, found 5 hours ago
$228
Roundtrip
found 5 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Mon, Apr 28 from Alamosa to Denver, returning Sat, May 17, priced at $228 found 5 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Sun, Apr 27 - Thu, May 8
ALS
Alamosa
DEN
Denver
$238 Roundtrip, found 2 hours ago
$238
Roundtrip
found 2 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Sun, Apr 27 from Alamosa to Denver, returning Thu, May 8, priced at $238 found 2 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Sun, Apr 27 - Thu, May 1
ALS
Alamosa
DEN
Denver
$248 Roundtrip, found 3 hours ago
$248
Roundtrip
found 3 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Sun, Apr 27 from Alamosa to Denver, returning Thu, May 1, priced at $248 found 3 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Sat, Apr 26 - Sat, May 3
ALS
Alamosa
DEN
Denver
$268 Roundtrip, found 3 hours ago
$268
Roundtrip
found 3 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Sat, Apr 26 from Alamosa to Denver, returning Sat, May 3, priced at $268 found 3 hours ago
Flights from Alamosa (ALS) to Denver (DEN)
Origin airport
San Luis Valley Regional
Destination airport
Denver Intl.
Airlines serving
KEY LIME AIR DBA DENVER AIR CONNECTION
Roundtrip price
$192
Distance
178 mi

Alamosa to Denver Flights

The cheapest times to fly from Alamosa to Denver

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 Alamosa to Denver are during the month of May. You can find some of the cheapest flights from Alamosa to Denver with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Alamosa to Denver

Sunday is one of the best days to book for cheap flights from Alamosa to Denver: 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 Alamosa to Denver

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 Alamosa to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $99 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 Alamosa to Denver 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 Alamosa to Denver 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 San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN) cost?
Cheap round-trip flights from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN) start at $198. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Key Lime DBA Denver Air Connection flight leaving ALS on May 16 2025 and touching down at DEN. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from ALS to DEN?
The cheapest flights from ALS 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.
Which airlines fly direct from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN)?
Catch a nonstop flight with Denver Air Connection and head straight from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN).
What is the cheapest airline that flies from ALS to DEN?
Fly from ALS to DEN with Key Lime DBA Denver Air Connection. This carrier currently has the cheapest one-way ticket for this route, starting from $99. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ALS on July 14 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN)?
On average, there is just 1 direct flight operating from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN) every day. If this doesn’t fit your travel plans, consider flights with a layover. Just filter your search results on Expedia to include one or more stops to discover the next best option.
What are the most popular departure times for flights from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN)?
Flights between ALS and DEN are their busiest at 3 PM. If you want a quieter experience and possibly cheaper fares, choose a departure that’s outside typical rush times.
What day of the week has the most flights from ALS to DEN?
Saturday offers the most flights from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN). Consider taking off on this day and you’ll have a greater chance of finding a departure that works with your plans.
What is the earliest flight from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN)?
San Luis Valley Regional Airport (ALS)’s first flight to Denver Intl. Airport (DEN) leaves at approximately 8:00AM UTC-7. With a total travel time of 55m, you’ll arrive at around 8:55AM UTC-7.
How long does it take to fly from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN)?
Flights from ALS to DEN have an average travel time of 55 minutes. The distance between the two is 180 mi.
What airline has the least delays from ALS to DEN?
Consider traveling with United Airlines if you’d like to fly straight from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN) without any delays. This carrier has the best track record for punctuality, with an on-time score of 80%. Want to get notified of any changes? You can check your flight status using the Expedia App.
What is the best time to fly from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN)?
To reach Denver Intl. Airport (DEN) on time, choose a flight that takes off from San Luis Valley Regional Airport (ALS) before 3 PM. The likelihood 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.
What airports do you fly into for Denver from San Luis Valley Regional Airport (ALS)?
Compare your flight options from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN). This is the only Denver airport you can arrive at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN) last-minute?
Last-minute fares from ALS to DEN are typically more expensive. For the lowest rates, start looking for flights ahead of time. That said, if you’re flexible with your travel plans, you may land a cheap fare right before you leave.
Is it cheaper to book an ALS to DEN flight and hotel package?
Opting for an ALS to DEN 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 wide range of accommodations and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Luis Valley Regional Airport (ALS) to Denver Intl. Airport (DEN)?
If you booked your ALS to DEN 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 fare 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, visit our Customer Service portal for further details.

Explore a world of travel with Expedia

*Available to One Key members.