Affordable DEN to SEA Flights: Fly from the Rockies to the Pacific Northwest
Cheapest flight found
$73
Last updated Mar 13, 2026
Prices by Month
Price History
Tracking the Apr 2, 2026 departure — the cheapest date we found.
Price Behavior: DEN → SEA
Based on 6 months of fare data collected by Trip Manta.
Lowest Fare
$73
Highest Fare
$208
Median Fare
$152
Price Spread
$135
Prices vary significantly — hourly tracking is especially valuable here.
Cheapest month to fly: April 2026 (from $73)
Most expensive month: July 2026 (from $208)
Biggest price drop caught: $80 between consecutive checks
Most frequent cheapest airline: Frontier
What This Means for You
Flights from Denver to Seattle range from $73 to $208, a $135 spread across the months we track. If your dates are flexible, April 2026 tends to have the lowest fares. Because prices on this route change significantly, setting up hourly price alerts gives you the best chance of catching a short-lived drop before it corrects. We have caught drops as large as $80 between hourly checks on this route.
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From
Denver (DEN)
To
Seattle (SEA)
Airport Information
Denver (DEN)
Denver International Airport (DEN) is the largest airport in North America by land area and serves as a massive hub for United and Frontier, as well as a primary base for Southwest. Known for its iconic tented roof that mimics the snowy peaks of the Rockies, DEN offers a wide array of amenities, including an underground train system connecting the A, B, and C gates. Travelers should arrive early to navigate the security lines, which can be long, and enjoy the diverse art installations and local dining options available throughout the concourses.
Seattle (SEA)
Seattle-Tacoma International Airport (SEA), commonly known as Sea-Tac, is the primary gateway to the Pacific Northwest and sits roughly 14 miles south of downtown Seattle. The airport has undergone significant renovations, including the spectacular International Arrivals Facility and an updated North Satellite terminal. Sea-Tac provides excellent connectivity via the Link Light Rail, which offers an affordable and scenic 40-minute ride directly into the heart of the city, bypassing the often-congested Interstate 5 traffic.
Frequently Asked Questions
How long is the flight from DEN to SEA?
The average non-stop flight duration is approximately 3 hours and 15 minutes, covering an aerial distance of about 1,024 miles.
Which airlines offer direct flights between Denver and Seattle?
Major carriers providing direct service include United Airlines, Alaska Airlines, Southwest Airlines, and Delta Air Lines.
What is the time difference between Denver and Seattle?
Seattle is in the Pacific Time Zone, which is one hour behind Denver's Mountain Time Zone.
Is there a train from Sea-Tac airport to downtown?
Yes, the Sound Transit Link Light Rail runs frequently from the airport station to several stops in downtown Seattle and beyond.
Does Denver International Airport have a pet relief area?
Yes, DEN provides several indoor and outdoor pet relief areas for travelers flying with service animals or pets in each concourse.
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