$198 Cheap Flights from Seattle (SEA) to Alamosa (ALS)

View $198 flight on Tue, Jan 27, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Alamosa, CO (ALS-San Luis Valley Regional)

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Cheap Flights from Seattle to Alamosa (SEA-ALS)

Prices were available within the past 7 days and start at $198 for one-way flights and $364 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Nov 13 - Thu, Nov 20
SEA
Seattle
ALS
Alamosa
$364 Roundtrip, found 1 day ago
$364
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Nov 13 from Seattle to Alamosa, returning Thu, Nov 20, priced at $364 found 1 day ago
Delta
Wed, Nov 12 - Thu, Nov 20
SEA
Seattle
ALS
Alamosa
$369 Roundtrip, found 1 day ago
$369
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Nov 12 from Seattle to Alamosa, returning Thu, Nov 20, priced at $369 found 1 day ago
Delta
Thu, Nov 13 - Sun, Nov 23
SEA
Seattle
ALS
Alamosa
$379 Roundtrip, found 1 day ago
$379
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Nov 13 from Seattle to Alamosa, returning Sun, Nov 23, priced at $379 found 1 day ago
Delta
Mon, Nov 17 - Thu, Nov 20
SEA
Seattle
ALS
Alamosa
$384 Roundtrip, found 1 day ago
$384
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Nov 17 from Seattle to Alamosa, returning Thu, Nov 20, priced at $384 found 1 day ago
Delta
Mon, Nov 24 - Tue, Dec 9
SEA
Seattle
ALS
Alamosa
$394 Roundtrip, found 1 day ago
$394
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Nov 24 from Seattle to Alamosa, returning Tue, Dec 9, priced at $394 found 1 day ago
Delta
Mon, Nov 17 - Sun, Nov 23
SEA
Seattle
ALS
Alamosa
$399 Roundtrip, found 1 day ago
$399
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Nov 17 from Seattle to Alamosa, returning Sun, Nov 23, priced at $399 found 1 day ago
Delta
Sun, Nov 23 - Thu, Dec 4
SEA
Seattle
ALS
Alamosa
$424 Roundtrip, found 3 hours ago
$424
Roundtrip
found 3 hours ago
Select Delta flight, departing Sun, Nov 23 from Seattle to Alamosa, returning Thu, Dec 4, priced at $424 found 3 hours ago
Delta
Tue, Oct 28 - Tue, Nov 4
SEA
Seattle
ALS
Alamosa
$426 Roundtrip, found 1 day ago
$426
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Oct 28 from Seattle to Alamosa, returning Tue, Nov 4, priced at $426 found 1 day ago
Delta
Sun, Nov 23 - Mon, Dec 1
SEA
Seattle
ALS
Alamosa
$429 Roundtrip, found 5 days ago
$429
Roundtrip
found 5 days ago
Select Delta flight, departing Sun, Nov 23 from Seattle to Alamosa, returning Mon, Dec 1, priced at $429 found 5 days ago
United
Mon, Nov 24 - Fri, Nov 28
SEA
Seattle
ALS
Alamosa
$444 Roundtrip, found 3 hours ago
$444
Roundtrip
found 3 hours ago
Select United flight, departing Mon, Nov 24 from Seattle to Alamosa, returning Fri, Nov 28, priced at $444 found 3 hours ago

Alternative airports near Alamosa

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

Select flight to San Luis Valley Regional ALS. Cheapest and Closest option available. Average driving time to city center is 4 minutes. Flights from $469
ALS
San Luis Valley Regional
CheapestClosest
Average driving time to city center4 min
Flights from $469

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS) cost?
Get a cheap one-way flight from $198 or cheap return flight from $364 from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS) 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 Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS)?
November is the least expensive month to fly from SEA to ALS. Traveling during an off-peak travel window is often the key to finding a great deal.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SEA to ALS flight.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS)?
Nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SEA to ALS?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS)?
Book a flight from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS) that takes off 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 Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS) last-minute?
Last-minute bookings from SEA to ALS are generally more expensive. For the lowest prices, start searching for flights as soon as possible. That being said, if you're flexible with your travel dates, you may score a cheap ticket right before you leave.
Is it cheaper to book a SEA to ALS flight and hotel package?
Compared with arranging flights and hotels separately, booking a SEA to ALS flight and hotel package with Expedia could lead to significant savings. What's more, having it all in one place will take the stress out of planning your trip. Just secure your flights and choose from our extensive range of hotels, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to San Luis Valley Regional Airport (ALS)?
It's generally possible to cancel or reschedule your SEA to ALS 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 if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
San Luis Valley Regional
Roundtrip price
$364
Distance
1082 mi

Book with confidence

Seattle to Alamosa Flights

The cheapest times to fly from Seattle to Alamosa

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

 

The best time to book a flight from Seattle to Alamosa

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

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 Seattle to Alamosa in 2025. You can also book with separate airlines for your outbound and return journeys, from $198 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 Seattle to Alamosa 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 Seattle to Alamosa 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.

 

Seattle to Alamosa Flights

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*Available to One Key members.