$79 Cheap United flights Denver (DEN) to Seattle (SEA)

View $79 flight on Wed, Sep 3, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$79 Cheap United flights Denver (DEN) to Seattle (SEA)

Prices were available within the past 7 days and start at $79 for one-way flights and $157 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Sep 24 - Sat, Sep 27
DEN
Denver
SEA
Seattle
$157 Roundtrip, just found
$157
Roundtrip
just found
Select United flight, departing Wed, Sep 24 from Denver to Seattle, returning Sat, Sep 27, priced at $157 just found
United
Wed, Oct 8 - Sat, Oct 18
DEN
Denver
SEA
Seattle
$161 Roundtrip, found 2 hours ago
$161
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Oct 8 from Denver to Seattle, returning Sat, Oct 18, priced at $161 found 2 hours ago
United
Fri, Sep 5 - Tue, Sep 9
DEN
Denver
SEA
Seattle
$161 Roundtrip, found 1 hour ago
$161
Roundtrip
found 1 hour ago
Select United flight, departing Fri, Sep 5 from Denver to Seattle, returning Tue, Sep 9, priced at $161 found 1 hour ago
United
Sat, Nov 1 - Wed, Nov 5
DEN
Denver
SEA
Seattle
$168 Roundtrip, found 1 hour ago
$168
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Nov 1 from Denver to Seattle, returning Wed, Nov 5, priced at $168 found 1 hour ago
United
Wed, Oct 22 - Sat, Nov 1
DEN
Denver
SEA
Seattle
$169 Roundtrip, found 2 hours ago
$169
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Oct 22 from Denver to Seattle, returning Sat, Nov 1, priced at $169 found 2 hours ago
Flights from Denver (DEN) to Seattle (SEA)
Origin airport
Denver Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Popular airline
Alaska Airlines
Distance
1022 mi
Average flight time
1 hour 54 mins

Frequently asked questions

How much is a United Airlines flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
Use the "Price (lowest to highest)" filter on Expedia to find cheap United Airlines return flights from $157 from DEN to SEA. Affordable one-way options from $79 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from DEN to SEA with United Airlines?
January is one of the least expensive months to get away to Seattle with United Airlines. You could also find excellent prices on return and one-way fares in February.
What is the cheapest time to book flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) with United Airlines?
Look for affordable United Airlines flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) one to three months before your departure date. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the best day to book a domestic flight is usually Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
Book a seat on one of United Airlines's 33 weekly direct flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA). To see your choices, enter your origin, destination and dates and hit search. Then select the "Nonstop" and "Airline" filters.
How long does it take to fly from DEN to SEA with United Airlines?
The journey time for a direct United Airlines flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) takes approximately 3h 6m.
Which day of the week has the most United Airlines flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
Sunday has the most United Airlines flights from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA). With 5 daily departures, this is the best day of the week to book something that will work for your schedule.
What is the earliest United Airlines flight from DEN to SEA?
Setting off from DEN at 7:50AM UTC-7, the earliest United Airlines flight to SEA lands at 9:59AM UTC-8. Flying early means you're less likely to encounter delays or cancellations.* After something later? The last United Airlines flight from DEN to SEA departs at 9:04PM UTC-7 and touches down at 11:09PM UTC-8.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Seattle?
United Airlines flights from Denver Intl. Airport (DEN) to Seattle land at Seattle - Tacoma Intl. Airport (SEA). This is the main gateway to this city.
Why fly with United Airlines from DEN to SEA?
A rewarding loyalty program and the ability to rack up points through United Mileage Plus are the start of the reasons to travel from DEN to SEA with United Airlines. Plus, when you sign up to Expedia's free One Key™ program, you can earn OneKeyCash™* in addition to United Airlines's loyalty program earnings. It's yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
For the Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA) route, United Airlines typically flies Boeing 737 MAX 9 and Boeing 737-800 planes. Don't forget that last-minute changes are possible for operational purposes, meaning your flight may be on another aircraft.
Can I change or cancel my United Airlines flight from Denver Intl. Airport (DEN) to Seattle - Tacoma Intl. Airport (SEA)?
Depending on your fare type, a fee may apply if you modify or cancel your flight more than 24 hours after it's been confirmed. To find tickets with more flexibility, select our "Changes included" and "No cancel fee" boxes when searching for flights. For more details on canceling or changing your reservation, head to "Trips," select your flight and tick "Manage Booking."

Explore a world of travel with Expedia

*Available to One Key members.