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Denver to Seattle - Flights Starting at US$36

Book one-way or return flights from Denver to Seattle from as little as US$36. Choose from the popular airlines below and book your flight today!

  • One way
  • Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

We've found these cheap flights for you. You may book a one-way or round trip as per your needs.

We monitor flight fares to help you seize the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Cheapest airlines flights from Denver to Seattle

View airlines operating flights from Denver to Seattle. Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Sun Country Airlines
From US$47
Frontier Airlines
From US$50
Alaska Airlines
From US$106
Delta Air Lines
From US$134
United Airlines
From US$138
Southwest Airlines
From US$171
American Airlines
From US$336
ANA airlines

Find more flights and airlines

Alternative Routes from Denver to Seattle

Discover different routes, airlines, and transfers and find the best alternative flights for your journey from Denver to Seattle.

  • Cheapest
    Frontier Airlines
    DEN
    06:36
    3h 3m
    Direct
    SEA
    08:39
    Denver International Airport - Seattle-Tacoma International Airport
    Tue, Jun 11Frontier Airlines
    US$50
  • Frontier Airlines
    DEN
    06:36
    3h 3m
    Direct
    SEA
    08:39
    Denver International Airport - Seattle-Tacoma International Airport
    Tue, Jun 11Frontier Airlines
    US$50
    Find More Flights

Frequently Asked Questions

  • When are flight tickets from Denver (DEN) to Seattle (SEA) the cheapest?

    Airlines adjust prices for flights from Denver to Seattle based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
  • How much do flights from Denver (DEN) to Seattle (SEA) cost?

    According to Trip.com's data, the lowest price is around $234.
  • How long does it take to fly from Denver (DEN) to Seattle (SEA) and what is the distance?

    It takes around 3 hours 14 minutes to fly from Denver (DEN) to Seattle (SEA).
  • What is the transportation method from the main airport to downtown in Seattle?

    • The distance from Seattle-Tacoma International Airport to downtown is about 17km. It takes about 30 minutes by taxi.
  • What are the most popular airlines that fly from Denver (DEN) to Seattle (SEA)?

How to find a cheap flight from Denver to Seattle

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Denver to Seattle. Book your flights at the right time and save more.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com
Denver to Seattle Flight Information

Cheapest nonstop flight price

$36

Cheapest round-trip ticket price

$66

Off-season for travel

February

Peak season for travel

November

Flight distance

1,644.78km

Average flight time

3 hours 14 minutes

Popular airline

Delta Air Lines