• Flights
  • Packages
  • Hotels
  • Cars
Round-trip
Coach

Refine your search by airline, by city or airport or direct flights


Book with Confidence: 40M+ Travelers, 20+ years of Expertise
Price Match Promise
Find great flight deals to destinations worldwide
24/7 Customer Support
Speak to our travel experts: anytime, anywhere
ClubMiles Rewards
Earn points and air miles to maximize your rewards
Easy Cancellations
Convenient options online and 24/7 Customer Support

When’s a good time to book a flight from Denver to Seattle?

What’s the cheapest day of the week to fly from Denver to Seattle?‡

Search Cheap Flights
What is the cheapest month to fly from Denver to Seattle?‡

Search Cheap Flights

‡This information is based on historical data from the last 365 days.

Finding Affordable Flights from Denver to Seattle
  • Plan Ahead - One of the keys to securing cheap flights from Denver to Seattle is to plan your trip well in advance. Airlines often offer lower prices for those who book tickets months ahead. Keep an eye on special promotions and sales events, which can yield significant savings.
  • Flexibility is Key - Being flexible with your travel dates can also lead to substantial cost savings. Consider flying during off-peak seasons or on weekdays when prices tend to be lower.
  • Set Price Alerts - To keep tabs on flight prices, consider setting up fare alerts. These alerts will notify you when fares from Denver to Seattle drop, giving you the opportunity to grab cheap deals.
  • Consider Nearby Airports - If Seattle has multiple airports, check the prices at each one. Sometimes, flying into a nearby airport and then taking a short train or bus ride to your destination can be a much cheaper option.
  • Bundle and Save - Booking your flight and accommodation together as a package can often result in significant savings. CheapOair offers these bundled deals, so make sure to explore this option.

When is the Cheapest Time to Book Flights from Denver to Seattle?

‡

Got flexible travel dates? Use our flight data from the past year to discover ideal times to fly from Denver to Seattle. Find out which months and days typically offer lower fares and score our best savings.

CheapOair provides the predicted prices for one-way trips or round-trips with a duration of 7 days for domestic and 14 days for international trips based on historical data and available flight information. Graphs are estimates only. Prices are subject to change and can't be guaranteed until ticketed.
Estimated price for
Round-trip

‡Graphs are estimates only. Based on historical data and available flight information. Prices are subject to change and cannot be guaranteed until ticketed.

What Our Customers Say About Our Service?

sitejabber-review
Excellent | 4 Stars
Based on 233,423 reviews
Great | 4.1 Stars
Based on 23,777 reviews
Submit A Review
  • Dec 10, 2025 Dipender Panwar I want to recognize the outstanding service provided by Jochim. His professionalism, attention to detail, and genuine customer care have consistently stood out. Interactions with him are always clear, patient, and solution focused. Team members like Jochim make a real difference and reflect positively on the organization.

    Read More

  • Aug 31, 2025 Ray Hobson Very reliableThis was my first time using this site and I was very please with how everything was handled. Right after I booked my flight I got a call from one of the associates letting me know i didn't pick out my seats, and choose my seat for my trip there and back from my destination. I was kept up to date in my flight information and they made sure I got my boarding pass. My trip was very stress free. I will be using them again. Thank you!

    Read More

  • Aug 28, 2025 MariaEsperanza Estilo Nicko Went Above and BeyondI had to change the return flight of two out of four passengers in our group. Because only half of the group need to travel differently, it took several calls to Iberia Airlines directly and because of the time difference, Nicko coordinated and helped me over a couple of days. Throughout the experience, he explained what he was doing and why he needs to put me on hold and why he needs to call me back the following day, He was very knowledgeable, professional and empathetic to my predicament. Nicko owned the issues and the process and was very transparent with cost and every details of the transactions. I am very grateful and because of him, I will always trust CheapOAir with my travel needs. -Maria E.E.

    Read More

See all reviews

Denver to Seattle Flight Route Information

Travel Distance:1,023 Miles
Airlines Flying This Route: Frontier Airlines, United Airlines, Alaska Airlines
Weekly Flights:404
Avg. Flight Duration:16.04 Hours

Insights About Flying from Denver to Seattle

Q. Which is the high season to travel from Denver to Seattle?

A. The month of August is considered the high season for flying from DEN to SEA. Traveling during the high season can affect ticket prices and availability, making this data crucial for trip planning.

Q. How many direct flights are available from DEN to SEA?

A. There are a total of 1617 direct flights from Denver to Seattle. For travelers seeking convenience and shorter travel times, this data is important when choosing flight options.

Q. Which is the low season to travel from Denver to Seattle?

A. April is considered the low season for traveling from Denver to Seattle, Washington. Travelers looking for cost-effective options and fewer crowds may consider traveling during this period.

Q. How many daily flights are there between Denver to Seattle?

A. There are as many as 53 daily flights available for travelers between DEN to SEA. This data offers flexibility in choosing departure times that best suit your schedule.

Q. Which is the busiest day for passengers flying between Denver to Seattle?

A. Monday are the busiest days for passengers flying between Denver to Seattle. Knowing the peak travel day can help you plan your trip to avoid overcrowded flights or airports.

Q. At what time does the last flight depart to Seattle?

A. The last flight to Seattle typically departs between 10:00PM - 11:00PM. Travelers who prefer late-night departures will find this information valuable for planning their journey.

Q. What percentage of travelers spent an average of 1 days in Seattle, Washington?

A. Approximately 39.59% of travelers spent an average of 1 days exploring Seattle. This information can assist in planning the duration of your stay in Seattle

Q. What percentage of DEN to SEA flyers traveled with kids under 14?

A. About 7% of passengers on flights from Denver to Seattle were accompanied by children under the age of 14. This information is useful if you're planning a family trip and want to know how common it is to travel with young children on this route.

Q. What percentage of Denver to Seattle travelers were over 60 years old?

A. A notable 15% of travelers were aged 60 or older. This statistic provides insights for senior travelers or those seeking a mature travel demographic.

Q. What percentage of DEN to SEA travelers were millennials?

A. Millennials make up a significant portion of travelers on this route, accounting for 40% of all passengers. If you're a millennial looking to connect with like-minded travelers, this statistic might interest you.

Q. What percentage of Denver to Seattle travelers were female?

A. Almost half of the passengers, approximately 48% were female. Knowing the gender distribution can be useful for solo female travelers or those interested in gender-related travel insights.

Q. What percent of Denver to Seattle travellers booked first or business class?

A. 6% of travelers booked first or business class on this route.

Q. At what time the earliest flight departs from Denver?

A. The earliest flight departs at 7:00AM - 8:00AM.

Q. On which days one can have the most flight options in Seattle?

A. Monday offer the most flight options in Seattle.

§ All flight facts are based on last 3 months' data except the highest and lowest booking months that are based on last 3 months' data.

Cheap Flights from Denver to Seattle

Looking for flights from Denver (DEN) to Seattle (SEA)? Find affordable air travel deals on CheapOair and save big on air tickets online. Surrounded by the beautiful Olympic Mountains, Seattle is a beautiful little gem that is famous for its exciting arts scene and huge parks. If you love art then you'll certainly cherish a visit to the Seattle Asian Art Museum which offers a rare collection of Japanese and Chinese art. Looking for exciting hiking trails? Then head to the Carkeek Park, or even better visit the Discovery Park which offers everything from hiking, boating to beautiful cliff views. To reach Seattle, SEA from Denver, DEN you can choose from top airlines such as, US Airways, Frontier Airlines and American Airlines. The average time taken by a flight to cover the distance of 1024 miles between the two cities is about 2 hours and 46 minutes.
Download Our App

Get CheapOair deals on the GO!

Download
Check Your Flight Status

Get there on time, every time!

Check Status

Check Denver to Seattle flight status

Earn 2X points on CheapOair app
Earn up to 6X points on CheapOair app
Book on our apps (iOS & Android).
  • Get notified when prices drop for trips you are planning
  • Change or cancel your flights on the go!
  • Get flight alerts and updates for your trips
Switch to the app
Scan QR and installScan QR and install

Award-winning assistance, affordable travel

  • Excellent | 4 Stars
    Based on 233,423 reviews
    This rating is as of 02/10/2025
    Close[x]
  • Great | 4.1 Stars
    Based on 23,777 reviews
  •   American Business Awards
    2020 Gold Stevie – Product
    Management Team of the Year
  •   Stevie Awards for Sales & Customer Service
    2021 Bronze Stevie – Customer Service
    Department of the Year
  •  

Easy Access

Connect with Us
  • Quick Links
  • Popular Airlines
  • Popular Flight Routes
  • Top U.S. Destinations
  • Top International Destinations
Explore our cheap airfare options by carrier, with over 500 options to choose from.
Book one of our most popular flight routes with three easy clicks.
Find cheap airline tickets to popular U.S. destinations from coast to coast.
Get cheap air travel to global destinations in Europe, Asia and beyond.
partners logos

© 2006-2025 Fareportal, Inc. All rights reserved. Privacy Policy and agree to our Terms and Conditions. California: CST #2073455, Florida: ST37449, Hawaii - SOT#TAR-7560-0, Washington: WASOT #602755832 (affiliate of Travelong, Inc.)