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Cheap flight tickets from Denver to Seattle

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Compare Denver to Seattle flight deals

Find the cheapest month or even day of the year to fly to Seattle

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Flight deals from Denver to Seattle

Looking for a cheap last-minute deal or the best return flight from Denver to Seattle? Find the lowest prices on one-way and return tickets right here.
Seattle.RM525 per passenger.Departing Tue, 16 Sep, returning Tue, 23 Sep.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Denver International on Tue, 16 Sep, arriving in Seattle / Tacoma International.Inbound direct flight with Southwest Airlines departs from Seattle / Tacoma International on Tue, 23 Sep, arriving in Denver International.Price includes taxes and charges.From RM525, select.
Seattle.RM583 per passenger.Departing Sat, 9 Aug, returning Tue, 12 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Sat, 9 Aug, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 12 Aug, arriving in Denver International.Price includes taxes and charges.From RM583, select.
Seattle.RM588 per passenger.Departing Tue, 15 Jul, returning Tue, 22 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Tue, 15 Jul, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 22 Jul, arriving in Denver International.Price includes taxes and charges.From RM588, select.
Seattle.RM605 per passenger.Departing Mon, 23 Jun, returning Fri, 27 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Mon, 23 Jun, arriving in Paine Field.Inbound direct flight with Frontier Airlines departs from Paine Field on Fri, 27 Jun, arriving in Denver International.Price includes taxes and charges.From RM605, select.
Seattle.RM615 per passenger.Departing Wed, 1 Oct, returning Sat, 4 Oct.Return flight with United.Outbound direct flight with United departs from Denver International on Wed, 1 Oct, arriving in Seattle / Tacoma International.Inbound direct flight with United departs from Seattle / Tacoma International on Sat, 4 Oct, arriving in Denver International.Price includes taxes and charges.From RM615, select.
Seattle.RM630 per passenger.Departing Thu, 28 Aug, returning Tue, 2 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Thu, 28 Aug, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 2 Sep, arriving in Denver International.Price includes taxes and charges.From RM630, select.
Seattle.RM669 per passenger.Departing Sat, 27 Sep, returning Sat, 4 Oct.Return flight with Delta.Outbound direct flight with Delta departs from Denver International on Sat, 27 Sep, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Sat, 4 Oct, arriving in Denver International.Price includes taxes and charges.From RM669, select.
Seattle.RM716 per passenger.Departing Sun, 27 Jul, returning Fri, 1 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Sun, 27 Jul, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Fri, 1 Aug, arriving in Denver International.Price includes taxes and charges.From RM716, select.

Find the cheapest month to fly from Denver to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver to Seattle flights are currently cheapest in September.
Jun
from RM609
Jul
from RM592
Aug
from RM587
Sep
from RM528
Oct
from RM619
Nov
from RM930
Dec
from RM923
Jan
from RM923
Feb
from RM931
Mar
from RM931
Apr
from RM931
May
Find prices

Direct flights from Denver to Seattle

Alternative Denver to Seattle routes

Looking for the cheapest, fastest or easiest route from Denver to Seattle? You could fly into the following airports instead.

Denver to Seattle: Flight information

The things to know before you go.
Cheapest flight foundRM525
Cheapest month to flySeptember
Average flight time3 hrs, 5 mins
Most popular airlineSouthwest Airlines
Average flights per week457

Finding cheap flights from Denver to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Denver to Seattle is RM528. 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.
3 hours and 4 minutes is the average flight time from Denver to Seattle.
Southwest Airlines, Alaska Airlines and Hawaiian Airlines fly direct from Denver to Seattle.
As of June 2025, there are 457 flights per week flying from Denver to Seattle.
The cheapest month to fly from Denver to Seattle is usually June 2025.
If you're flying from Denver, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from RM528.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Denver to Seattle on Tuesday, 16 September 2025.
Yes – the average flight time is 3 hours and 4 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 Seattle 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 Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In June, the average temperature is usually around 14°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
The cheapest airline that flies to Seattle is Southwest Airlines .

Flying from Denver to Seattle: what you need to know

  • Denver's main airport is Denver International Airport (DEN). Explore your options for leaving from this base when searching for flights from Denver to Seattle.

  • When it comes to where you'll hop off the plane, Seattle's chief entry point is Seattle-Tacoma International Airport (SEA).

  • Around 3 hours is how long you can expect to be in the air on a direct Denver to Seattle flight.

  • Seattle is one hour behind Denver and observes the UTC-7 timezone.

  • With 114 weekly flights between the two airports, Denver International Airport (DEN) to Seattle-Tacoma International Airport (SEA) is the most popular route. Hop on the earliest flight from Denver to Seattle with Frontier Airlines at 05:01. If you'd like to make the most of your day before taking off, the last departure from DEN to SEA is with Southwest Airlines at 22:50.

  • For a smooth journey, turn up at the airport two hours ahead of international flights and one hour before domestic departures. This leaves you with plenty of time to board your Denver to Seattle flight.

  • Popular months like July or high seasons such as Thanksgiving and Christmas/New Year will mean longer queues at check-in and security. Be on the safe side and head to the airport even earlier. Arriving two hours before domestic flights and four hours ahead of international departures is a wise idea.

How to find the cheapest flights from Denver to Seattle

  • RM261 is currently the lowest price for a one-way ticket from Denver to Seattle. Return flights start from RM528. These prices may change based on demand.

  • Score cheap Denver to Seattle flights by booking two months ahead. Based on our research, that's the sweet spot for finding a bargain.

  • May is the best month for picking up a fantastic deal on a plane ticket from Denver to Seattle. If you need to travel during a different time of year, the 'Whole month' tool will give you the lowest prices across every month.

  • Getting a cheap flight from Denver to Seattle is easy with Price Alerts. Simply set up one of these automatic alerts and we'll notify you as soon as the price has dropped.

  • Save on your Denver to Seattle flight with the help of our filters. Select your ideal times, airlines and number of stops, then sort the results by 'Cheapest' for the best deals.

Flying from Denver

Denver International Airport (DEN)

  • You can book a direct flight from Denver to Seattle departing from Denver International Airport (DEN). Begin your trip at DEN and land at Seattle-Tacoma International Airport (SEA).

  • There's a good selection of airlines that offer direct Denver to Seattle plane tickets out of DEN. The most popular include:

  • DEN is around 31 kilometres from central Denver. If you're ride-sharing, catching a cab or driving from the centre, it'll take 35 minutes or so to get there, depending on traffic. If you're planning to take public transport, expect the trip time to be around 1 hour 30 minutes.

  • Staying the night at a hotel can take the hassle out of arriving at the airport on time. If you want a place to stay before your flight from Denver to Seattle, check out Baymont by Wyndham Denver International Airport. It's an easy drive from Denver International Airport.

  • 80.23% of flights departing from Denver International Airport arrive at their destination according to schedule. With its strong on-time performance, you're unlikely to be delayed when taking off from DEN.

  • You'll find DEN at 8500 Pena Boulevard.

Arriving in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) is approximately 18 kilometres from central Seattle. If you're catching a cab or a ride-share, the drive takes roughly 20 minutes.

  • If you're travelling by public transport, expect a journey time of roughly 55 minutes.

  • Book a hotel near SEA if you have a late flight from Denver to Seattle. Check in to one of these options and skip the long transfer:

  • Get your adventure underway by picking up a Seattle-Tacoma International Airport rental car. Grab your wheels from Thrifty, Europcar or Budget and explore beyond Seattle's usual tourist stops.

  • Get the best deal by reserving your ride from Seattle-Tacoma International Airport about one week before your departure date.

Lake Union Sea Plane Base Airport (LKE)

  • As soon as your flight from Denver to Seattle has hit the runway, you can make your way to the city centre in about 10 minutes by car. Central Seattle is roughly 3 kilometres from Lake Union Sea Plane Base Airport (LKE).

  • You can expect the journey to take roughly 25 minutes on public transport.

  • You'll find some great places to call home for the night near LKE. Kick back after your Denver to Seattle flight at any of these well-located options:

Best time to go to Seattle

  • July is the most popular month for flights from Denver to Seattle. To avoid the crowds, go to Seattle in May.

  • Lock in a Denver to Seattle ticket departing in August if you're eager to explore the city during its warmest month. Expect temperatures in Seattle to range from 12ºC (54ºF) to 28ºC (82ºF).

  • February has average temperatures of between -1ºC (30ºF) and 11ºC (52ºF). Search for cheap flights from Denver to Seattle around that time if you want to travel when it's cooler.

More about Seattle

  • When it comes to looking for somewhere to lay your head, you'll find the top stays in Seattle right here. Browse these hotels once you've booked your flight from Denver to Seattle:

  • Greyhound: Bus Station and LMN Architects are just two of the popular attractions to put on your Seattle itinerary. Keep the momentum going by heading to Boeing Radiation Effects Lab.

Explore more of United States

  • Portland is just one of the many places in United States waiting to be explored after you've experienced Seattle. Around 241 kilometres to the south, its top attractions include Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • Spokane is another sought-after destination in United States and is around 370 kilometres east of Seattle. No journey is complete without visiting Manito Park, Northwest Museum of Arts & Culture and Spokane Falls.

Plan the rest of your trip from Denver to Seattle

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