Seattle to Denver Flight Time & Schedules

What Is the Usual Flying Time from Seattle to Denver?

A nonstop flight from Seattle to Denver usually takes around 2 hours 30 minutes to 3 hours 5 minutes, depending on the airline and individual departure. Flights leave Seattle-Tacoma International Airport (SEA) and arrive at Denver International Airport (DEN). Current schedules put many direct journeys close to the 2-hour-50-minute mark.

The airport-to-airport route covers approximately 1,028 miles (1,654 km). Despite travelling from the Pacific Northwest to Colorado, passengers can complete the trip in under three hours on many nonstop schedules.

Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines and Southwest Airlines provide nonstop passenger service between SEA and DEN.

Connecting itineraries are also available. Some of the quicker options take approximately 4 hours 24 minutes through Redmond, 4 hours 47 minutes via Portland, or 4 hours 57 minutes through Helena. Longer routes are available through Salt Lake City, Bozeman, Boise and other airports.

Because direct flights are frequent and relatively short, a nonstop service will normally provide the quickest overall journey. Connecting flights can add two hours or more once the transfer is included.

Typical Length of a Nonstop Seattle-to-Denver Journey

Most direct SEA–DEN flights are scheduled for roughly 2 hours 30 minutes to just over 3 hours. Delta describes its Seattle-to-Denver service as taking about 2 hours 50 minutes, while Southwest lists an average flight time of approximately 2 hours 38 minutes.

Nonstop flights operate between Seattle-Tacoma International Airport (SEA) and Denver International Airport (DEN) throughout the week.

The route is approximately 1,028 miles (1,654 km) long, with current nonstop schedules ranging from around 2 hours 30 minutes to 3 hours 3 minutes.

Travelers have several airline choices, including Alaska Airlines, Delta, Frontier, United and Southwest. The number of departures differs by airline and travel date.

For passengers mainly concerned with reaching Denver quickly, flying nonstop normally makes more sense than adding an intermediate airport and layover.

One of the shorter indirect options can involve a transfer at Redmond Municipal Airport (RDM) in Oregon.

Selected SEA–RDM–DEN itineraries can take approximately 4 hours 24 minutes overall, including a connection of around 40 minutes on quicker schedules.

Although this is relatively efficient for a one-stop trip, it is still noticeably longer than many nonstop Seattle-to-Denver flights.

Connection times vary, so travelers should check the full elapsed journey rather than assuming every Redmond itinerary will have the same duration.

Portland International Airport (PDX) can also be used as a connecting point between Seattle and Denver.

Some faster SEA–PDX–DEN schedules take approximately 4 hours 47 minutes, including a relatively short layover.

Another possible option is Helena Regional Airport (HLN). Selected itineraries through Helena can take around 4 hours 57 minutes in total.

Both journeys remain longer than flying directly, but they can provide alternatives when a preferred nonstop departure is unavailable.

Travelers can find several additional connecting options beyond Redmond, Portland and Helena.

Depending on the date and airline, possible transfer airports include Salt Lake City, Bozeman, Kalispell, Spokane, Boise, Pasco, Idaho Falls, Missoula, Eugene and Billings.

Examples of approximate faster journey times include:

Around 5 hrs 17 mins via Salt Lake City
Around 5 hrs 20 mins via Bozeman
Around 5 hrs 32 mins via Spokane
Around 5 hrs 41 mins via Boise
Around 5 hrs 50 mins via Pasco
Around 5 hrs 55 mins via Missoula

These figures are schedule examples rather than guaranteed durations. A longer layover can increase the overall journey considerably.

Seattle to Denver Journey Time by Routing

Departure Airport	Arrival Airport	Route Code	Estimated Flight Time
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–DEN	Around 2 hrs 30 mins–3 hrs 5 mins nonstop
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–RDM–DEN	Around 4 hrs 24 mins with one stop
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–PDX–DEN	Around 4 hrs 47 mins with one stop
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–HLN–DEN	Around 4 hrs 57 mins with one stop
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–SLC–DEN	Around 5 hrs 17 mins with one stop
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–BZN–DEN	Around 5 hrs 20 mins with one stop
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–GEG–DEN	Around 5 hrs 32 mins with one stop
Seattle-Tacoma International Airport (SEA)	Denver International Airport (DEN)	SEA–BOI–DEN	Around 5 hrs 41 mins with one stop

Current route information shows nonstop flights taking approximately 2 hours 30 minutes to 3 hours 3 minutes, while quicker one-stop options begin at around 4 hours 24 minutes.
These times should be used as general planning estimates. Airline schedules, weather, air-traffic conditions and layover lengths can all alter the actual journey.

Airlines Flying Nonstop Between Seattle and Denver

United Airlines

Alaska Airlines

Delta Air Lines

Southwest Airlines

Frontier Airlines

How Does Denver Time Compare with Seattle?

Denver is one hour ahead of Seattle.

Seattle follows Pacific Time, while Denver uses Mountain Time. During daylight saving time, Seattle observes PDT (UTC−7) and Denver observes MDT (UTC−6). During standard time, Seattle changes to PST and Denver to MST, preserving the one-hour difference.

For example, 10:00 AM in Seattle = 11:00 AM in Denver

Because both cities generally change their clocks on the same U.S. daylight-saving schedule, Denver remains one hour ahead throughout the year.

The time difference affects how departure and arrival times appear on a ticket. A flight leaving Seattle at 10:00 AM and lasting roughly 2 hours 45 minutes could arrive in Denver at approximately 1:45 PM local time because Denver's clock is already one hour ahead.

Explore More Flight Times & Routes

Planning beyond this route? Explore more flight times, distances, and travel durations using our tools below.

Start with our Flight Time Calculator to estimate journey times worldwide, or browse average travel times from your departure city using the Seattle Flight Times.