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

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Compare Seattle to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

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Flight deals from Seattle to Denver International

Looking for a cheap last-minute deal or the best return flight from Seattle to Denver International? Find the lowest prices on one-way and return tickets right here.
Denver.$205 per passenger.Departing Tue, 3 Jun, returning Tue, 10 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 3 Jun, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Tue, 10 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $205, select.
Denver.$211 per passenger.Departing Wed, 21 May, returning Wed, 28 May.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Wed, 21 May, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 28 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $211, select.
Denver.$213 per passenger.Departing Wed, 28 May, returning Tue, 1 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Wed, 28 May, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Tue, 1 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $213, select.
Denver.$216 per passenger.Departing Tue, 1 Jul, returning Sat, 5 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 1 Jul, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 5 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $216, select.
Denver.$216 per passenger.Departing Sat, 2 Aug, returning Sat, 9 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Sat, 2 Aug, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 9 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $216, select.
Denver.$242 per passenger.Departing Sat, 31 May, returning Mon, 2 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Sat, 31 May, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Mon, 2 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $242, select.
Denver.$245 per passenger.Departing Thu, 28 Aug, returning Tue, 2 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Thu, 28 Aug, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Tue, 2 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $245, select.
Denver.$245 per passenger.Departing Thu, 4 Sep, returning Wed, 10 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Thu, 4 Sep, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 10 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $245, select.

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 June.
May
from $211
Jun
from $205
Jul
from $216
Aug
from $216
Sep
from $245
Oct
from $330
Nov
from $300
Dec
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Jan
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Feb
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Mar
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Apr
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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$205
Cheapest month to flyJune
Average flight time2 hrs, 46 mins
Most popular airlineWestJet
Average flights per week333

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 $205. 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 to Denver International.
WestJet, Southwest Airlines and Air Tahiti Nui fly direct from Seattle to Denver International.
As of May 2025, there are 333 flights per week flying from Seattle to Denver International.
The cheapest month to fly from Seattle to Denver International is usually May 2025.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Denver International Airport on Tuesday, 3 June 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.
The cheapest airline that flies to Denver International is Frontier Airlines .

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

  • All great adventures set off from Seattle's main airport, Seattle-Tacoma International Airport (SEA). Check out your options for booking a flight from Seattle to Denver International Airport (DEN) departing from this terminal.

  • 2 hours 43 minutes is the average duration of a direct flight from Seattle to Denver International Airport.

  • Denver International Airport is located in Denver. The city operates in the UTC-6 timezone and is 1 hour ahead of Seattle.

  • Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN) is the most popular route. There are 159 direct departures a week to pick from. If you have things to do before leaving, hop on the last flight with Frontier Airlines at 22:39. Choose the first SEA to DEN departure operated by Southwest Airlines at 05:00 if you want to get going earlier.

  • For a stress-free journey, arrive at the airport two hours ahead of international flights and an hour before domestic departures. This way, you'll have plenty of time to board your flight from Seattle to DEN.

  • July is a busy time to fly out. If you're heading away then or around a major holiday like Thanksgiving, Memorial Day or Christmas, 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)

  • You can book a direct flight from Seattle to Denver International Airport (DEN) out of Seattle-Tacoma International Airport (SEA).

  • Direct flights from Seattle to Denver International Airport are available from numerous airlines at SEA. Fly with any of these:

  • SEA is approximately 23 kilometres from central Seattle. To work out how to get there, use Google Maps. This handy traveller tool will give you the fastest route and your public transport options.

  • Catching an early flight from Seattle to Denver International Airport? Avoid rushing to the terminal (and catch some extra z's) by choosing one of these hotels near Seattle-Tacoma International Airport:

Lake Union Sea Plane Base (LKE)

About Denver International Airport (DEN)

  • Once your flight from Seattle to Denver International Airport has landed, kick back and relax at a nearby hotel. SpringHill Suites Denver Airport is a comfortable option just a short drive from DEN.

Getting from Denver International Airport (DEN) to central Denver

  • Denver International Airport is approximately 40 kilometres from the centre of Denver. With your own car rental or in a cab, the drive is around 34 minutes.

  • If you're travelling on public transport, expect a journey of about 1 hour and 31 minutes.

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

  • The best price we've found for a one-way ticket from Seattle to Denver International Airport is $101. The cheapest price for a return flight is $205. Remember fares can change due to availability at the time of booking.

  • Score flight tickets from Seattle to DEN by booking at least 8 months ahead. Based on flight price data, that's the sweet spot for finding a bargain.

  • You'll land the best savings on your tickets from Seattle to Denver International Airport if you plan your holiday for May. Go one step further and use the 'Whole month' search tool to find the cheapest day to fly out.

  • Finding a cheap ticket from Seattle to DEN is easy with Price Alerts. All you need to do is create one of these automatic alerts and we'll get in touch as soon as there's a better deal.

  • Use the filters to tailor your flights from Seattle to Denver International Airport. Simply enter your preferred departure and arrival times, number of stops and airlines. You can also sort your results by 'Cheapest' to see the best deals.

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

  • April is the quietest time of year to fly to Denver. Alternatively, join the crowds and go in July. This is the busiest month for flights from Seattle to Denver International Airport, but the best time to go is your call.

  • Think about the kind of weather that'll work with your plans for Denver. July is known as the warmest month. Lock in your flights from Seattle to DEN sometime then and you can expect temperatures of between 14ºC and 32ºC.

  • If you want to travel in cooler conditions, search for a cheap flight from Seattle to Denver International Airport in January when temperatures average between -9ºC and 7ºC.

More about Denver

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

  • One of the best ways to get a feel for Denver is to check out its popular attractions. Highlights include Denver Art Museum, Union Station and Denver Botanic Gardens.

Complete your Denver trip with a car rental

  • Finding you a cheap flight from Seattle to Denver International Airport isn't our only party trick. Browse our car rentals in Denver and travel at your own pace. We search for deals from trusted car rental providers and put them all in one place. You can instantly compare offers and then book with no fees.

Plan the rest of your trip from Seattle to Denver

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