Seattle (SEA) to Denver (DEN) Flights: Expert Travel Guide
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Last updated Feb 15, 2026
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Tracking the May 7, 2026 departure — the cheapest date we found.
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Search FlightsTraversing the distance between the emerald landscapes of the Pacific Northwest and the majestic peaks of the Rocky Mountains, flights from Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN) serve as a vital link for both adventure seekers and business professionals. This flight path, typically lasting around two and a half hours, transports passengers from the maritime climate of the Puget Sound to the sunny, high-altitude atmosphere of the Mile High City. Whether you are planning a winter getaway to world-class ski resorts or heading to Denver for its booming craft brewery scene and tech industry, this route offers a seamless transition between two of the most dynamic metropolitan areas in the western United States, with multiple daily departures provided by several major and budget carriers.
Travel Tips
To secure the best value, aim to book your tickets at least three to four weeks in advance, as last-minute fares on this popular corridor can fluctuate wildly based on seasonal demand. If you are traveling during the winter months, be sure to pack layers in your carry-on, as the weather in Denver can shift from sunny to snowy in a matter of hours. For those carrying outdoor equipment like skis or snowboards, verify your airline's specific baggage policy ahead of time, as some carriers offer seasonal waivers or specific handling fees for sports gear. Finally, because Denver is situated at a high elevation, it is highly recommended to stay hydrated throughout your flight from Seattle to help your body acclimate to the thinner air upon arrival.
Airport Information
Seattle (SEA)
Seattle-Tacoma International Airport (SEA), also known as Sea-Tac, is the primary commercial airport serving the Seattle metropolitan area. It serves as a major hub for Alaska Airlines and Delta Air Lines, offering a wide range of amenities including local Pacific Northwest dining options, automated transit systems between terminals, and a significant collection of contemporary art. Located just south of downtown, it is easily accessible via the Link Light Rail.
Denver (DEN)
Denver International Airport (DEN) is one of the largest and busiest airports in the world, recognizable by its iconic tented roof structure that mimics the Rocky Mountains. As a major hub for United, Southwest, and Frontier, it provides efficient connections to the entire mountain region. Travelers can easily reach downtown Denver via the RTD A-Line commuter rail, which takes roughly 37 minutes and departs directly from the airport's transit center.
Seasonal Pricing Patterns
Flight prices from Seattle to Denver generally peak during two specific times of the year: the winter holiday season (late December to early January) and the height of the summer vacation season in July and August. Conversely, the most budget-friendly months to fly are typically late January, February, and October. During these shoulder seasons, the decrease in tourist traffic often leads to significantly lower airfares and better availability for non-stop flights, especially for those who can travel on Tuesdays or Wednesdays.
Frequently Asked Questions
What is the average flight time from Seattle to Denver?
The average non-stop flight duration is approximately 2 hours and 40 minutes, covering a distance of about 1,024 miles.
Which airlines offer non-stop flights between SEA and DEN?
Major carriers offering direct service include Alaska Airlines, United Airlines, Southwest Airlines, Delta Air Lines, and Frontier Airlines.
Is there a time difference between Seattle and Denver?
Yes, Denver is in the Mountain Time Zone (MST/MDT), which is one hour ahead of Seattle's Pacific Time Zone (PST/PDT).
How far is Denver International Airport from the city center?
The airport is located about 25 miles northeast of downtown Denver, which is roughly a 30 to 45-minute drive depending on traffic conditions.
What is the cheapest day of the week to fly this route?
Mid-week departures, particularly on Tuesdays and Wednesdays, are statistically the most affordable days to fly from Seattle to Denver.