$68 Cheap Flights from Seattle (SEA) to Denver (DEN)

View $68 flight on Tue, Oct 14, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Denver Intl. Airport (DEN)

  • 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

Cheap Flights from Seattle to Denver (SEA-DEN)

Prices were available within the past 7 days and start at $68 for one-way flights and $109 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Oct 29 - Sat, Nov 1
SEA
Seattle
DEN
Denver
$109 Roundtrip, found 23 hours ago
$109
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Wed, Oct 29 from Seattle to Denver, returning Sat, Nov 1, priced at $109 found 23 hours ago
United
Sat, Nov 15 - Tue, Nov 18
SEA
Seattle
DEN
Denver
$137 Roundtrip, found 4 days ago
$137
Roundtrip
found 4 days ago
Select United flight, departing Sat, Nov 15 from Seattle to Denver, returning Tue, Nov 18, priced at $137 found 4 days ago
Frontier Airlines
Sun, Sep 14 - Mon, Sep 22
SEA
Seattle
DEN
Denver
$143 Roundtrip, found 23 hours ago
$143
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sun, Sep 14 from Seattle to Denver, returning Mon, Sep 22, priced at $143 found 23 hours ago
Frontier Airlines
Wed, Oct 8 - Sun, Oct 12
SEA
Seattle
DEN
Denver
$144 Roundtrip, just found
$144
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Oct 8 from Seattle to Denver, returning Sun, Oct 12, priced at $144 just found
Frontier Airlines
Sat, Aug 30 - Thu, Sep 4
SEA
Seattle
DEN
Denver
$145 Roundtrip, found 1 hour ago
$145
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, Aug 30 from Seattle to Denver, returning Thu, Sep 4, priced at $145 found 1 hour ago
Frontier Airlines
Fri, Sep 12 - Wed, Sep 17
SEA
Seattle
DEN
Denver
$151 Roundtrip, found 2 hours ago
$151
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Seattle to Denver, returning Wed, Sep 17, priced at $151 found 2 hours ago
Frontier Airlines
Fri, Sep 5 - Sun, Sep 7
SEA
Seattle
DEN
Denver
$152 Roundtrip, just found
$152
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Sep 5 from Seattle to Denver, returning Sun, Sep 7, priced at $152 just found
Southwest Airlines
Sat, Sep 27 - Tue, Sep 30
SEA
Seattle
DEN
Denver
$157 Roundtrip, found 1 hour ago
$157
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Sat, Sep 27 from Seattle to Denver, returning Tue, Sep 30, priced at $157 found 1 hour ago
Delta
Sat, Oct 11 - Tue, Oct 14
SEA
Seattle
DEN
Denver
$158 Roundtrip, found 1 hour ago
$158
Roundtrip
found 1 hour ago
Select Delta flight, departing Sat, Oct 11 from Seattle to Denver, returning Tue, Oct 14, priced at $158 found 1 hour ago
Hawaiian Airlines
Wed, Dec 17 - Wed, Dec 24
SEA
Seattle
DEN
Denver
$185 Roundtrip, found 10 hours ago
$185
Roundtrip
found 10 hours ago
Select Hawaiian Airlines flight, departing Wed, Dec 17 from Seattle to Denver, returning Wed, Dec 24, priced at $185 found 10 hours ago

Find the cheapest month to fly from Seattle (SEA) to Denver (DEN)

January is typically the cheapest month to fly

From $65 - $262 per traveler.

Graph displaying average flight prices per month

Flights from Seattle (SEA) to Denver (DEN)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$109
Distance
1022 mi
Average flight time
3 hours 39 mins

Seattle to Denver Flights

The cheapest times to fly from Seattle to Denver

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Denver are during the month of October. You can find some of the cheapest flights from Seattle to Denver with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Denver

Sunday is one of the best days to book for cheap flights from Seattle to Denver: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Denver

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $68 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Denver flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Denver airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN) cost?
Pick up cheap return flights starting at $110 from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving SEA on August 19 2025 and touching down at DEN. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from SEA to DEN?
The cheapest flights from SEA to DEN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN)?
Catch a nonstop flight from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN) with 5 carriers, including:

  • United Airlines
  • Southwest Airlines
  • Delta Air Lines
  • Alaska Airlines
  • Frontier Airlines

What is the cheapest airline that flies from SEA to DEN?
At the moment, the cheapest airline operating one-way flights from SEA to DEN is Frontier Airlines. You can jet off on this route from $62. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SEA on September 25 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN)?
With, on average, 14 direct flights departing from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN) daily, you'll be up in the air in no time.
What are the most popular departure times for flights from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN)?
The 3 PM departures from SEA to DEN see the highest demand. Greater demand means you'll likely pay more for these departures. If you're hoping to save money, choose a less crowded time to fly.
What day of the week has the most flights from SEA to DEN?
If you travel on a Friday, you'll get the biggest range of choices for flights from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN).
What is the earliest flight from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN)?
Hop on the earliest flight at around 5:00AM UTC-8, leaving from Seattle - Tacoma Intl. Airport (SEA). You'll be in the air for roughly 2h 43m, landing at Denver Intl. Airport (DEN) at approximately 8:43AM UTC-7.
How long does it take to fly from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN)?
It takes about 2 hours and 44 minutes to travel the 1,000 mi from SEA to DEN.
What airline has the least delays from SEA to DEN?
American Airlines has the strongest track record for on-time direct flights from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN), with an on-time rating of 80%. Use the Expedia App to view your journey status before you head off and get immediate updates about any changes.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN)?
To avoid potential delays on the Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN) route, travel before 3 PM. Flights after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Denver from Seattle - Tacoma Intl. Airport (SEA)?
If you're flying on a direct flight from Seattle - Tacoma Intl. Airport (SEA) to Denver, Denver Intl. Airport (DEN) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN) last-minute?
Last-minute fares from SEA to DEN are generally more expensive. To lock in the lowest rates, start looking for flights ahead of time. That being said, if you're flexible with your travel plans, you may score a cheap fare just before your departure.
Is it cheaper to book a SEA to DEN flight and hotel package?
Compared with arranging flights and hotels separately, booking a SEA to DEN flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one place will take the hassle out of planning your trip. Simply pick your flights and choose from our extensive range of stays, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Denver Intl. Airport (DEN)?
If you booked your SEA to DEN flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more details.

Explore a world of travel with Expedia

*Available to One Key members.