Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in January or February, booked 68 days in advance, depart on a Monday or Tuesday and return on a Monday
Find flight deals from Denver to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 2 April 2026.
Have a flexible travel schedule? Discover the best time to fly to Seattle from Denver with our price prediction graph.
DEN-SEA
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
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Everything you need to know about your flight from Denver to Seattle
Prices
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Delays
How far ahead should I book a flight from Denver to Seattle?
Use this chart to determine the optimal time to book a return flight from Denver to Seattle. Price data was last updated on 13 March 2026.
To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 39 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Denver to Seattle?
Currently, November is the cheapest month in which you can book a flight from Denver to Seattle (average of £41). Flying from Denver to Seattle in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from DEN to SEA?
Find hourly flight availability from Denver to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 2 April 2026.
It’s typically best to fly out from Denver to Seattle in the evening. Doing so could potentially save you 55% on the flight price compared to flying in the afternoon, which is usually more expensive.
How much does it cost for a return flight from Denver to Seattle?
Weekly flight availability from Denver to Seattle
Explore weekly flight availability from Denver to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 2 April 2026.
The most flights from DEN to SEA are scheduled on a Monday (34 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 on average).
How often are flights from Denver to Seattle delayed?
About 20% of weekly flights between Denver and Seattle have experienced delays in the past year, with the average delay time being 144 minutes.
What is the most punctual flight time for Denver to Seattle flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Wednesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Denver to Seattle flights?
Over the past year, United Airlines have had the lowest number of delays on this route, with just 13% of flights being delayed.
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 2 April 2026.
Read reviews from past customers who have flown with Frontier
from Denver to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delay at the beginning in Philly and then huge delay just sitting on the tarmac after landing, for one hour in Nashville
Related info for your journey
Find useful and relevant information for your journey from Denver to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
What airports do I use to fly from Denver to Seattle?
You will need to book a flight from Denver Intl to Seattle/Tacoma Intl if you want to fly from Denver to Seattle. At least 1 airline has flights from Denver Intl (DEN) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 25 flights to Seattle from the Denver airport per day. If you manage to book one that is nonstop, then you can expect the flight time from DEN to SEA to be around 3h 03m.
How popular is this Denver to Seattle flight route?
The Denver Intl to Seattle/Tacoma Intl flight path was viewed by 16 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
How long is the flight from Denver to Seattle?
Departing from Denver to Seattle will take you 3h 20m. Denver and Seattle are separated by a distance of 1022 mi. Both multi-stop and direct flights can be found to your destination and back.
What is the cheapest airline to fly from Denver to Seattle round-trip?
Flying on Frontier is currently your cheapest option to Seattle, with prices starting at £66. Frontier is priced at 58% lower than the current average price of a flight leaving 3 months from now.
What are the most reliable airlines from Denver to Seattle?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Denver to Seattle on time: WestJet (95%), Icelandair (92%), Air Tahiti Nui (90%).
What are the cheapest flights from Denver to Seattle?
The cheapest flight price from Denver to Seattle is £128. On average you can expect to pay £160. The most popular route, (Denver Intl - Seattle/Tacoma Intl), can usually be booked for £166.
Can I find deals for business class flights from Denver to Seattle?
Yes. Cheapflights offers flight deals from Denver to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Denver to Seattle?
Currently, November is the cheapest month in which you can book a flight from Denver to Seattle (average of £41). Flying from Denver to Seattle in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 2 April 2026.
Discover the top airline that operate flights from Denver to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 2 April 2026.
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Denver to Seattle?
Deals for Denver to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Denver to Seattle?
Cheapflights helps you find that perfect flight to Seattle from Denver by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!
Can Cheapflights find flights from Denver to Seattle with no change fees?
Cheapflights does show flights with no change fees to all users. To see these options for flights from Denver to Seattle, users can toggle the no change fees filter when performing a flight search.
Can Cheapflights notify me if prices for flights from Denver to Seattle become cheaper?
Not ready to book yet? You can track prices for flights from Denver to Seattle on Cheapflights with our Price Alert feature and get notified when better prices are available.
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