flight_takeoff DEN → SEA

Cheap Flights from Denver to Seattle

Compare fares on the medium-haul flight from Denver to Seattle — a northwestbound route of about 1,022 miles, typically flown nonstop in around 2h 35m.

Fares from $90 one-way, economy · as of Jul 7, 2026

straighten

Distance

1,022 mi

1,645 km

schedule

Est. flight time

2h 35m

nonstop

flight

Nonstop service

Available

5 carriers

language

Time difference

1 hour behind

Seattle

Flying from Denver to Seattle

Flights from Denver International Airport (DEN) to Seattle Tacoma International Airport (SEA) cover roughly 1,022 miles (1,645 km) on a northwestbound heading, a nonstop flight of about 2h 35m. The route crosses 1 time zone — Seattle is 1 hour behind Denver. It's served by 5 airlines.

Lets Fly Travel compares live fares across hundreds of airlines to find the best deal on this route — and every booking is reviewed by a real travel agent before ticketing.

Airlines on this route

Airlines with recent nonstop fares on the DEN–SEA route (as of Jul 7, 2026):

flightAlaska flightAmerican flightDelta flightFrontier flightSouthwest flightUnited

Airline availability and fares change over time — search your dates for current options.

Best time to fly Denver to Seattle

Fare patterns and travel conditions vary by season. Here's what to expect on the DEN–SEA route throughout the year.

Jan–Feb

Winter weekdays on the Denver–Seattle route are often lightly booked — a good window for budget-conscious travelers.

Mar–May

Spring demand picks up, especially around school break periods. Searching Tuesday–Thursday departures usually surfaces the cheapest fares.

Jun–Aug

Summer travel is busy on this medium-haul flight. Booking 3–5 weeks out and avoiding Friday/Sunday departures helps keep costs down.

Sep–Oct

Post-summer shoulder period often brings the lowest fares on the DEN–SEA route. Weather is usually still pleasant at both ends.

Nov–Dec

Holiday travel between Denver and Seattle books up fast. Set a fare alert and book as soon as you confirm your plans.

flight_land Arriving at

Seattle Tacoma International Airport

Seattle is served by Seattle Tacoma International Airport (IATA: SEA , ICAO: KSEA). Allow time for baggage claim and ground transportation after landing.

IATA Code

SEA

Flight Time

~2h 35m

Distance

1,022 mi

tips_and_updates Arrival tips

›Check in online to save time at the airport.
›Arrive 2 hours before departure.
›Compare fares across several nearby dates for best value.

Denver to Seattle — FAQs

How long is the flight from Denver to Seattle? expand_more

A nonstop flight from Denver (DEN) to Seattle (SEA) takes approximately 2h 35m, covering a distance of about 1022 miles (1645 km). Actual flight time varies with aircraft, routing and winds.

How much is a flight from Denver to Seattle? expand_more

Recent one-way economy fares from Denver to Seattle have started around $90 (as of July 2026). Prices change frequently, so search live results for current fares.

Which airlines fly from Denver to Seattle? expand_more

Airlines with recent nonstop fares on the DEN–SEA route include Alaska, American, Delta, Frontier, Southwest, United. Use our search to compare current carriers, schedules and fares.

Is there a nonstop flight from Denver to Seattle? expand_more

Yes. The DEN–SEA route has nonstop service. Nonstop availability can vary by season and day of week, so check live results for your dates.

How far is Seattle from Denver? expand_more

The distance from Denver (DEN) to Seattle (SEA) is about 1022 miles (1645 km) as the crow flies.

What is the time difference between Denver and Seattle? expand_more

Seattle is 1 hour behind Denver. Factor the time change into your arrival and connection planning.

When is the best time to book flights from Denver to Seattle? expand_more

For domestic routes like Denver to Seattle, booking about 1–3 months ahead and choosing mid-week departures usually finds the best prices. Avoid peak Friday and Sunday travel where possible.