$208 Cheap Flights from Alamosa (ALS) to Seattle (SEA)

View $208 flight on Sat, Nov 15, 2025Opens in a new window

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

Cheap Flights from Alamosa to Seattle (ALS-SEA)

Prices were available within the past 7 days and start at $208 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How much does a flight from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA) cost?
Get a cheap one-way flight from $208 or cheap return flight from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA)?
Planning your trip for is a good way to save, as it's the cheapest month for flights between ALS and SEA. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline that'll fly you from ALS to SEA, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA)?
You'll need to hop on a flight with a layover if you're traveling from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from ALS to SEA?
You'll usually 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 San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA)?
To arrive at Seattle - Tacoma Intl. Airport (SEA) on schedule, book a flight that leaves 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.
Is it cheaper to buy a plane ticket from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your plane ticket from ALS to SEA shortly before your getaway is usually more expensive. However, if there's some wiggle room with your departure dates and times, you could grab a cheap last-minute fare.
Is it cheaper to book an ALS to SEA flight and hotel package?
You'll typically save money by booking an ALS to SEA flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After selecting your preferred flights and accommodations, consider other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from San Luis Valley Regional Airport (ALS) to Seattle - Tacoma Intl. Airport (SEA)?
You can usually reschedule or cancel your ALS to SEA flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
San Luis Valley Regional
Destination airport
Seattle - Tacoma Intl.
Distance
1082 mi

Book with confidence

Book with confidence

Alamosa to Seattle Flights

The cheapest times to fly from Alamosa to Seattle

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

 

The best time to book a flight from Alamosa to Seattle

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

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 Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $208 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 Seattle 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 Seattle 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.

 

Alamosa to Seattle Flights

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*Available to One Key members.