Cheap Flights from Seattle / Tacoma International to Denver International

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Compare Seattle / Tacoma International to Denver International flight deals

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Flight deals from Seattle / Tacoma International to Denver International

Looking for a cheap last-minute deal or the best return flight from Seattle / Tacoma International to Denver International? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Seattle / Tacoma International to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Seattle / Tacoma International to Denver International flights are currently cheapest in August.

Direct flights from Seattle / Tacoma International to Denver International

Seattle / Tacoma International to Denver International: Alternative routes

Compare routes from Seattle / Tacoma International to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

Seattle to Denver: Flight information

The things to know before you go.
Cheapest flight foundج.م.‏ 3,055
Cheapest month to flyOctober
Average flight time2 hrs, 45 mins
Most popular airlineSouthwest Airlines
Average flights per week426

Finding cheap flights from Seattle / Tacoma International to Denver International: Frequently asked questions

The best price we found for a return flight from Seattle / Tacoma International to Denver International is ج.م.‏ 3,999. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 45 minutes is the average flight time from Seattle / Tacoma International to Denver International.
Southwest Airlines, WestJet and United fly direct from Seattle / Tacoma International to Denver International.
As of June 2025, there are 426 flights per week flying from Seattle / Tacoma International to Denver International.
The cheapest month to fly from Seattle / Tacoma International to Denver International is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Seattle / Tacoma International Airport to Denver International Airport on Saturday, 6 September 2025.
Yes – the average flight time is 2 hours and 45 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines offers the cheapest flight tickets to Denver International.

Flying from Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN): what you need to know

  • Book a direct flight from Seattle-Tacoma International Airport to Denver International Airport and you'll be in the air for an average of 2 hours 45 minutes.

  • Denver's timezone is UTC-6, making Denver one hour ahead of Seattle.

  • Choose from 159 weekly Seattle-Tacoma International Airport to Denver International Airport flights. The 05:00 departure with United Airlines is the earliest available. Frontier Airlines operates the last service of the day at 22:39.

  • To ensure you catch your SEA to DEN flight, leave enough time for things like baggage drop and finding your gate. Turning up two hours ahead of international departures and an hour before domestic flights is the general travel rule.

  • Travelling during a peak month like July? School holidays and other popular periods can lead to longer lines at airport checkpoints. Be extra cautious and arrive up to four hours ahead of an international flight and two hours before domestic departures.

  • There are direct flights from Seattle-Tacoma International Airport to Denver International Airport, so getting to Denver (and then touring more of United States!) is simple. Top carriers that fly nonstop include:

  • Alaska Airlines tops the list for bookings on this route.

  • United Airlines leads the way as the most punctual carrier for SEA to DEN flights, with 92.75% of its services landing as scheduled.

  • Think about adding a stopover when booking your ticket from Seattle-Tacoma International Airport to Denver International Airport. Simply uncheck 'Direct flights only' to break up your trip, or perhaps see a new city along the way. Here are some options between SEA and DEN:

    • Portland International Airport

    • Boise Air Terminal (Gowen Field) Airport

    • Spokane International Airport

How to find the cheapest flights from Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN)

  • The lowest price we've found for a one-way Seattle-Tacoma International Airport to Denver International Airport flight is ج.م.‏ 3,055. A round-trip ticket is currently ج.م.‏ 3,999. Depending on the availability when you book, these fares may change.

  • To pick up cheap tickets from SEA to DEN, book your journey six months before your departure.

  • Organise your trip for May. That's the cheapest month for flights from Seattle-Tacoma International Airport to Denver International Airport. If you're flexible with your travel dates, try out the 'Whole month' tool to find the cheapest price across each month.

  • Landing cheap flights from SEA to DEN is a cinch with Price Alerts. All you need to do is set up one of these automatic alerts and we'll get in touch as soon as fares go down.

  • Select your preferred departure and arrival times, number of stops and airlines with the filters. Alternatively, sort your results by 'Cheapest' to find the best deals on flights from Seattle-Tacoma International Airport to Denver International Airport.

Handy information about Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport has a strong on-time performance, making delays less likely. Departures from SEA arrive on schedule 81.27% of the time.

  • To get to Seattle-Tacoma International Airport from central Seattle, it takes about 20 minutes if you're going by car. Of course, this depends on traffic conditions. It's approximately 23 kilometres from the airport to the city centre.

  • Planning to take public transport? You can expect a journey time of around 55 minutes.

  • Taking an early flight from Seattle-Tacoma International Airport to Denver International Airport? Avoid the hassle of rushing to the terminal (and get some extra shut-eye) by choosing one of these stays near SEA:

Arriving at Denver International Airport (DEN)

  • Once your Seattle-Tacoma International Airport to Denver International Airport flight has touched down, relax at a hotel close by. Baymont by Wyndham Denver International Airport is a good option within easy reach of DEN.

  • Pick up a Denver International Airport rental car and explore Denver and beyond with your own wheels. Routes Car Rentals, Dollar and Budget are popular outlets you can book with here.

  • Lock in the best possible rate by reserving your ride from Denver International Airport about one week before your travel date.

Getting from Denver International Airport (DEN) to central Denver

  • DEN is located at 8500 Pena Boulevard.

  • From Denver International Airport, Denver is approximately 40 kilometres away. It takes around 35 minutes to reach the centre driving.

  • Travelling to the centre by public transport will take you around 1 hour 30 minutes.

When to fly to Denver International Airport (DEN)

  • The quietest month for a flight from Seattle-Tacoma International Airport to Denver International Airport is April, while July is the busiest. Choose the best time to go to Denver based on whether you prefer a more fast-paced or easygoing experience.

  • When reserving your flight from Seattle-Tacoma International Airport to Denver International Airport, consider the type of weather you like. July is the warmest month in Denver, with the temperature ranging from 14ºC to 32ºC.

  • Look for cheap tickets from SEA to DEN in January if you like travelling in cooler conditions. Temperatures are at their lowest then, ranging between -9ºC and 7ºC on average.

Explore more of United States

  • Denver has loads to offer, but there are so many other parts of United States you'll want to see. About 105 kilometres south of Denver, a visit to Colorado Springs will keep your itinerary busy. Start with leading sights like US Northern Command (USNORTHCOM) / North American Aerospace Defence Command (NORAD) Headquarters, Cheyenne Mountain Air Force Station and National Strength and Conditioning Association (NSCA).

  • Aurora is another well-known destination in United States and is around 13 kilometres east of Denver. No journey is complete without experiencing Magellan's Travel Solutions and Gear, The Fairways at Lowry and Retired Enlisted Association Inc.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.