Denver to Seattle Flights (DEN to SEA)
Compare fresh fare data, watch this route 24/7, and get an instant email after a qualifying price drop is confirmed.
Cheapest flight found
$64
Last updated Aug 21, 2026
Prices by Month
Price History
Tracking the Sep 15, 2026 departure — the cheapest date we found.
No price history yet. Check back after the next price check.
Price Behavior: DEN → SEA
Based on 7 months of fare data collected by Trip Manta.
Lowest Fare
$64
Highest Fare
$150
Median Fare
$79
Price Spread
$86
Prices vary significantly, so 24/7 tracking is especially valuable here.
Cheapest month to fly: September 2026 (from $64)
Most expensive month: August 2026 (from $150)
What This Means for You
Flights from Denver to Seattle range from $64 to $150, a $86 spread across the months we track. If your dates are flexible, September 2026 tends to have the lowest fares. Because prices on this route change significantly, setting up 24/7 tracking with instant alerts gives you the best chance of catching a short-lived drop before it corrects.
Track this route and save
Watch DEN to SEA fares 24/7 and get an instant email after a qualifying price drop is confirmed.
Start Tracking This FlightSearch this route
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.
Learn More About Price Tracking
Flight Price Tracker
How Trip Manta watches the flight you choose 24/7 and sends instant alerts after confirmed drops.
Best Flight Price Trackers
Compare 6 mainstream trackers using public product documentation.
Trip Manta vs Google Flights
How 24/7 tracking and custom thresholds compare with Google Flights discovery tools.
Our Methodology
How we monitor flights 24/7, confirm price drops, and send instant alerts.
Hourly vs Daily Alerts
See how monitoring frequency changes which qualifying fare drops are detected.
Flight Price Alerts
Get an instant email after a qualifying DEN to SEA price drop is confirmed.