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Cheap flight tickets from Denver International to Seattle

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Compare Denver International 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 International to Seattle

Looking for a cheap last-minute deal or the best return flight from Denver International to Seattle? Find the lowest prices on one-way and return tickets right here.
Seattle.RM549 per passenger.Departing Wed, 10 Sep, returning Wed, 17 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Wed, 10 Sep, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Wed, 17 Sep, arriving in Denver International.Price includes taxes and charges.From RM549, select.
Seattle.RM549 per passenger.Departing Tue, 22 Jul, returning Tue, 29 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Tue, 22 Jul, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 29 Jul, arriving in Denver International.Price includes taxes and charges.From RM549, select.
Seattle.RM587 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 RM587, select.
Seattle.RM609 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 RM609, select.
Seattle.RM634 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 RM634, select.
Seattle.RM673 per passenger.Departing Wed, 1 Oct, returning Sat, 25 Oct.Return flight with Delta.Outbound direct flight with Delta departs from Denver International on Wed, 1 Oct, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Sat, 25 Oct, arriving in Denver International.Price includes taxes and charges.From RM673, select.
Seattle.RM673 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 RM673, select.
Seattle.RM721 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 RM721, select.

Find the cheapest month to fly from Denver International to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver International to Seattle flights are currently cheapest in July.
Jun
from RM609
Jul
from RM549
Aug
from RM587
Sep
from RM549
Oct
from RM673
Nov
from RM930
Dec
from RM923
Jan
from RM923
Feb
from RM930
Mar
from RM931
Apr
from RM931
May
Find prices

Direct flights from Denver International to Seattle

Alternative Denver International to Seattle routes

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

Denver to Seattle: Flight information

The things to know before you go.
Cheapest flight foundRM549
Cheapest month to flyJuly
Average flight time3 hrs, 5 mins
Most popular airlineSouthwest Airlines
Average flights per week459

Finding cheap flights from Denver International 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 International to Seattle is RM549. 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 5 minutes is the average flight time from Denver International to Seattle.
Southwest Airlines, Alaska Airlines and Hawaiian Airlines fly direct from Denver International to Seattle.
As of June 2025, there are 457 flights per week flying from Denver International to Seattle.
The cheapest month to fly from Denver International to Seattle is usually June 2025.
If you're flying from Denver International Airport, 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 RM549.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Denver International Airport to Seattle on Tuesday, 22 July 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.
Currently, Frontier Airlines offers the cheapest flight tickets to Seattle.

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

  • Approximately 2 hours 45 minutes is how long you'll be travelling on a direct flight from Denver International Airport to Seattle.

  • Seattle is one hour behind Denver, where Denver International Airport is located. Seattle follows the UTC-7 timezone.

  • Denver International Airport (DEN) to Seattle-Tacoma International Airport (SEA) is the most traveled route, with 114 weekly departures to pick from. If you have things to do before heading off, the last flight from DEN to SEA is with Southwest Airlines at 22:50. Opt for the first departure operated by Alaska Airlines at 06:00 if you want to fly out earlier.

  • Give yourself enough time to catch your DEN to Seattle flight. Generally, it's best to arrive two hours before international departures and an hour ahead for domestic flights.

  • Longer lines at check-in and security are likely if you're flying during high season, so give yourself some extra breathing room. A good general rule for peak times? Get there up to four hours ahead for international flights and at least two hours for domestic departures.

  • Start your journey at DEN and fly nonstop to Seattle-Tacoma International Airport (SEA). That's where you can expect to touch down when searching for Denver International Airport to Seattle tickets.

  • These are some of the leading carriers offering direct flights from Denver International Airport to Seattle:

  • The journey from central Denver to DEN takes about 1 hour 30 minutes by public transport. If you drive, ride-share or get a cab, you'll cover the 31 kilometres in 35 minutes or so, depending on traffic.

  • Get your flight from Denver International Airport to Seattle off to a leisurely start. Just a short drive from DEN, spend the night at The Westin Denver International Airport and be well-rested for the trip ahead.

  • 80.23% of flights departing from Denver International Airport land at their destination on time. Given its strong on-time performance, disruptions are unlikely when jetting out of DEN.

  • DEN is located at 8500 Pena Boulevard.

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

  • The best price we've found for a one-way Denver International Airport to Seattle flight is RM263. The cheapest price for a return flight is RM549. Keep in mind fares may change due to demand at the time of booking.

  • Get cheap flights from DEN to Seattle by booking one month ahead. Based on our research, that's the sweet spot for picking up a bargain.

  • The best month for scoring cheap Denver International Airport to Seattle tickets is May. Use the 'Whole month' tool to compare all available prices, then choose the dates with the lowest fares.

  • Save time looking for cheap flights from DEN to Seattle by setting up a Price Alert. We'll send you an email or notification on the app when a new discounted fare appears.

  • Select your ideal departure and arrival times, number of stops and airlines with our filters. Then, sort the results for your flight from Denver International Airport to Seattle by 'Cheapest,' 'Fastest' or 'Best.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) to the centre of Seattle takes around 20 minutes to reach by car. The centre is roughly 23 kilometres away.

  • Travelling to the centre on public transport will take you around 55 minutes.

  • The last thing you want is a lengthy journey to your hotel if you're landing late on a flight from Denver International Airport to Seattle. Reserve one of these accommodation options near SEA instead:

  • Hit the road running by picking up a Seattle-Tacoma International Airport rental car. Grab your wheels from Thrifty, Europcar or Budget to explore Seattle and beyond.

  • Booking your ride from Seattle-Tacoma International Airport around one week before your flight from DEN to Seattle can help you get the lowest rate.

Lake Union Sea Plane Base Airport (LKE)

  • Once your flight from Denver International Airport to Seattle has landed, 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).

  • If you're travelling on public transport, it'll take about 25 minutes.

  • Following your DEN to Seattle flight, unwind at a hotel near LKE. These are some comfortable accommodation options that'll help you slip into relaxation mode:

Best time to go to Seattle

  • Carefully consider your trip dates before booking your flight from Denver International Airport to Seattle. The city comes alive in high season, but rates are usually higher and major attractions can be busy. Plan your trip to Seattle in the low season if you prefer a quieter vibe.

  • When booking your Denver International Airport to Seattle flight ticket, think about the type of weather you enjoy. August is the warmest month in Seattle, with temperatures ranging from 12ºC (54ºF) to 28ºC (82ºF).

  • Look for cheap tickets from DEN to Seattle in February if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -1ºC (30ºF) and 11ºC (52ºF) on average.

More about Seattle

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

  • LMN Architects and Greyhound: Bus Station are just the start of the top attractions to put on your Seattle to-do list. Keep the sightseeing going at Boeing Radiation Effects Lab.

Explore more of United States

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

  • Around 370 kilometres east of Seattle, Spokane is another favourite stop in United States. Experience the best of this destination with a visit to 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.