flights.net SEA → DEN
- Distance
- 1,022 mi
- Carriers
- 4
Seattle–Tacoma International Airport (SEA) to Denver International Airport (DEN) is a US domestic route of about 1,022 miles. Alaska and United link Seattle with Denver across the Pacific Northwest and Rockies on a busy western corridor. Seattle to Denver mixes business, connecting, and outdoor-recreation travelers.
Connecting Seattle, United States with Denver, United States, this is one of the more travelled US domestic city pairs. Carriers fly the roughly 1,022-mile sector nonstop in about 2h 33m. Departures use Seattle–Tacoma International Airport, a 1 terminal airport that is a base for Alaska Airlines, Delta Air Lines; arrivals land at Denver International Airport, which has 1 terminal and anchors United Airlines, Southwest Airlines, Frontier Airlines. With hub operations at both ends, frequencies and schedules on the SEA–DEN sector stay competitive year-round.
Route facts
| Route | Seattle–Tacoma International Airport (SEA) → Denver International Airport (DEN) |
|---|---|
| Distance | 1,022 miles |
| Nonstop flight time | approximately 2h 33m |
| Nonstop carriers | 4 |
| Aircraft types | Boeing 737, Airbus A320, Embraer E175 |
| Market | US domestic |
Carriers on this route
Alaska Airlines, United Airlines, Southwest Airlines, Frontier Airlines operate nonstop service from Seattle to Denver. On-time performance and cancellation rates appear here once this route's BTS data is baked.
- Alaska Airlines (AS)
- United Airlines (UA)
- Southwest Airlines (WN)
- Frontier Airlines (F9)
Aircraft on this route
Carriers typically operate the Boeing 737, Airbus A320, Embraer E175 between Seattle and Denver. The exact type varies by airline, frequency and season.
Best time to fly
Summer and early fall offer reliable weather for both cities and scenic Rockies approaches. Winter storms can disrupt either end.
Connecting your trip
Planning departure or arrival logistics? See our airport guides for Seattle–Tacoma International Airport (SEA) and Denver International Airport (DEN) for terminals, hub airlines and the other routes each airport serves.
Fares & booking
Fares on the Seattle to Denver route move with season and demand; booking roughly two to eight weeks ahead usually beats walk-up prices, and midweek departures tend to be cheaper than weekends. We show indicative cached fares for SEA–DEN where available and link out to live Skyscanner search for current, bookable prices.
Related routes
Frequently asked questions
- How far is the flight from Seattle to Denver?
- Seattle–Tacoma International Airport (SEA) to Denver International Airport (DEN) is about 1,022 miles (1,645 km) by great-circle distance. A nonstop flight takes approximately 2h 33m.
- Which airlines fly nonstop from Seattle to Denver?
- Alaska Airlines, United Airlines, Southwest Airlines and Frontier Airlines operate nonstop service from Seattle–Tacoma International Airport (SEA) to Denver International Airport (DEN).
- What aircraft are used on the SEA to DEN route?
- Carriers typically operate the Boeing 737, Airbus A320 and Embraer E175 on the Seattle–Denver route.
- When is the best time to fly from Seattle to Denver?
- Summer and early fall offer reliable weather for both cities and scenic Rockies approaches. Winter storms can disrupt either end.
- Is SEA to DEN a nonstop flight?
- Yes. Seattle–Tacoma International Airport (SEA) to Denver International Airport (DEN) is a directional nonstop route flown by 4 carriers; connecting itineraries via other hubs are also widely available.
- What countries does the SEA to DEN route connect?
- This route links Seattle, United States with Denver, United States.
- Which airports does the Seattle to Denver route use?
- Flights depart Seattle–Tacoma International Airport (SEA/KSEA) in Seattle and arrive at Denver International Airport (DEN/KDEN) in Denver.
Data sources
- Airport identity and geography courtesy of OurAirports (ourairports.com); carriers and aircraft curated editorially.