🇺🇸→🇺🇸
Seattle → Denver
Seattle–Tacoma International Airport (SEA) to Denver International Airport (DEN)
1,645 km
Distance
5
Airlines
109
Flights per week
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Airlines operating this route
Frequently asked questions
What ID do I need for this domestic flight?
You'll need a valid government-issued photo ID accepted by TSA, such as a REAL ID-compliant driver's license, state ID, passport, or Enhanced Driver's License (EDL). As of 2025, REAL ID compliance is required for domestic air travel, so ensure your ID meets these standards. US citizens do not need a passport for this domestic route, though one is acceptable.
When is the best time to fly from Seattle to Denver?
The shoulder seasons of April-May and September-October offer ideal conditions with mild temperatures (50-70°F), fewer crowds, and lower fares compared to peak summer travel. Winter months (December-February) bring cold, snowy weather and increased flight delays, though they're popular for ski trips. Summer is peak season with warm weather but higher prices and busy airports.
How early should I arrive at Seattle-Tacoma Airport?
Arrive at least 2 hours before your domestic flight departure. Consider downloading the FlySEA app to check security wait times and navigate the airport more efficiently. If you're flying early morning, bag drop service is available as early as 3:30am, and you can use SEA Spot Saver to reserve a security screening slot between 4am-10pm.
About flights from Seattle (SEA) to Denver (DEN)
The route from Seattle–Tacoma International Airport (SEA) to Denver International Airport (DEN) covers a distance of 1,645 km . 5 airlines operate this route with up to 109 flights per week, ensuring excellent connectivity between Seattle and Denver.
United Airlines, Southwest Airlines, Delta Air Lines, Alaska Airlines, Frontier Airlines offer direct service on this route. Whether you're traveling for business or leisure, the frequency of flights means you can find departures throughout the day.
