Cheap Flights from Seattle (SEAA) to Denver International (DEN)

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Flight deals from Seattle to Denver International Airport

Looking for a cheap last-minute deal or the best return flight from Seattle to Denver International Airport? If you want to travel next month, return fares start from £78. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Seattle to Denver International

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

Direct flights from Seattle to Denver International

Seattle to Denver International: Alternative routes

Compare routes from Seattle 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 found£30
Cheapest month to flyMay
Average flight time2 hrs, 49 mins
Most popular airlineSouthwest Airlines
Average flights per week279

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

The best price we found for a return flight from Seattle to Denver International is £60. 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 49 minutes is the average flight time from Seattle to Denver International.
Southwest Airlines, Alaska Airlines and United fly direct from Seattle to Denver International.
As of March 2026, there are 279 flights per week flying from Seattle to Denver International.
The cheapest month to fly from Seattle to Denver International is usually May.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Denver International Airport on Wednesday, 6 May 2026.
Yes – the average flight time is 2 hours and 49 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.
The cheapest airline that flies to Denver International is Frontier Airlines .

Travelling from Seattle to Denver International Airport (DEN): What you need to know

  • Your travel story starts at one of Seattle's main airports, Seattle-Tacoma International Airport (SEA) or Seattle Paine Field International Airport (PAE). Explore your options for booking a flight from Seattle to Denver International Airport (DEN) departing from either of these bases.

  • Book a direct Seattle to Denver International Airport flight and you'll be travelling for around 2 hours 45 minutes.

  • The timezone in Denver is UTC-7, which is one hour ahead of Seattle. Denver International Airport is located in Denver.

  • The most popular route is from Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN), with 108 direct weekly services. If you're looking to take off without delay, the earliest flight from SEA to DEN is the 5am United Airlines option. If you prefer to leave later in the day, the final departure is at 9pm with Southwest Airlines.

  • Arrive at the airport on time so you don't miss your flight from Seattle to DEN. Be there at least two hours ahead for international flights and an hour early for domestic departures to prevent a last-minute sprint to your gate.

  • July is a busy travel month. If you're heading away then or around a major holiday like Thanksgiving, show up even earlier. Aim for at least two hours ahead for domestic flights and up to four hours for international journeys.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Fly without interruptions from Seattle-Tacoma International Airport (SEA). Nonstop flights from Seattle to Denver International Airport (DEN) can be booked from here.

  • These are some of the leading carriers operating direct flights from Seattle to Denver International Airport jetting out of SEA:

  • The majority of passengers choose to book seats with United between SEA and DEN.

  • The carrier with the most consistent on-time arrivals rate on this route is United.

  • SEA is around 23 kms (14 miles) from central Seattle. If you're driving, catching a taxi or ride-sharing from the centre, it'll take you 25 minutes or so to get there, depending on the traffic. If you're planning to take public transport, expect the trip time to be around 35 minutes.

  • Want a leisurely start to your trip? Stay near Seattle-Tacoma International Airport. Whether you're boarding an early flight from Seattle to Denver International Airport or just don't like being rushed, these hotels are the ideal choice:

  • Seattle-Tacoma International Airport has a solid on-time record, so flight disruptions are less likely. Departures from SEA arrive at their destination as scheduled 80% of the time.

Seattle Paine Field International Airport (PAE)

  • You can book a direct Seattle to Denver International Airport (DEN) plane ticket out of Seattle Paine Field International Airport (PAE). Work out whether leaving from PAE works best for your plans.

  • From PAE, direct flights from Seattle to DEN can be booked with Frontier Airlines.

  • On the PAE to DEN route, Frontier Airlines is the go-to airline for most travellers on this route.

  • Want to fly with the most punctual carrier? Go with Frontier Airlines. 84.62% of its flights between Seattle Paine Field International Airport and Denver International Airport arrive on schedule.

  • Using public transport, you can travel from central Seattle to PAE in around 1 hour 30 minutes. The airport is roughly 40 kms (25 miles) away, and getting there by car takes approximately 40 minutes.

  • Got a crack-of-dawn departure? Think about checking in to one of these accommodation options near Seattle Paine Field International Airport the day before your Seattle to DEN flight:

  • The majority of flights that depart Seattle Paine Field International Airport touch down at their destination as planned. It boasts a strong on-time performance rate of 80%.

About Denver International Airport (DEN)

  • Once your flight from Seattle to Denver International Airport has touched down, kick back and relax at a nearby hotel. Baymont by Wyndham Denver International Airport is a good option that's not too far from DEN.

  • For the lowest price, reserve your ride around one week in advance of your Seattle to Denver International Airport flight.

  • You'll find DEN at 8500 Pena Boulevard.

Getting from Denver International Airport (DEN) to central Denver

  • Denver International Airport is around 40 kms (25 miles) from the centre of Denver. It takes around 35 minutes or so to get to the city by car.

  • If you're using public transport, expect a journey time of roughly 35 minutes.

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

  • The lowest price we've found for a one-way ticket from Seattle to Denver International Airport is £30. For a return flight on this route, the best price is £60. Depending on when you want to go and the availability, these fares could change.

  • Booking ahead of time is often the key to scoring a cheap flight from Seattle to DEN. Flight prices rise as demand increases, so the closer you get to departure, the more you'll likely spend on your ticket.

  • The 'Whole month' search tool will show you the cheapest Seattle to Denver International Airport tickets across each month. It's a great way to snap up a bargain if your travel dates are flexible.

  • You don't need to check back in every day to find out if fares have dropped when you set up a Price Alert. We'll let you know the moment a lower fare pops up on plane tickets from Seattle to DEN.

  • Filters make it easier to dig up a deal for your flight from Seattle to Denver International Airport. Choose the flight times, carriers and stops that line up with your plans. Then sort the results by 'Cheapest' to find the most affordable option fast.

The best time to fly from Seattle to Denver International Airport (DEN)

  • Think about your travel style when deciding your trip dates. December is the quietest month to visit Denver. July is when most people book flights from Seattle to Denver International Airport (DEN), which may be perfect if you're chasing more action.

  • Book a Seattle to DEN plane ticket departing in July if you're eager to visit the city during its warmest month. Expect temperatures in Denver to range from 14ºC to 32ºC.

  • Search for cheap tickets from Seattle to Denver International Airport in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between -9ºC and 7ºC.

More about Denver

Explore more of the United States

  • Denver has loads to offer, but there are so many other parts of the United States waiting to be explored. About 113 kms (70 miles) south of Denver, a visit to Colorado Springs will keep your itinerary busy. Start with leading attractions like Garden of the Gods, Pikes Peak Region Attractions and Red Rock Canyon.

  • Around 177 kms (110 miles) south of Denver, Pueblo is another essential stop in the United States. Experience the best of this destination with a visit to Rosemount Museum, Cathedral of the Sacred Heart and Sangre de Cristo Arts & Conference Centre.

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