Cheap flights from Seattle to Colorado from $79

The month of January is, on average, the cheapest month to fly to Colorado from Seattle, with most prices found around $195. The month of October is another great option to travel to Colorado, with average flight prices from Seattle averaging around $224.

The cheapest day to depart from Seattle to Colorado is on a Friday when prices can be found for as low as $318. On the other hand, Sunday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $378.

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $269. In the morning is when there is more demand to fly to Colorado, so prices are often more expensive at around $388 per ticket.

Fly from Seattle/Tacoma Intl to Denver Intl for the best Seattle/Tacoma Intl - Colorado flight prices

You are more likely to see cheaper flights to Colorado from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $247 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from Seattle for as low as $206 on momondo.

There are 4 cabin classes available to choose from on Seattle to Colorado flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

United Airlines, Delta, and Southwest are the most popular carriers operating from Seattle/Tacoma Intl to Colorado

Frontier, United Airlines and Alaska Airlines are the top three most popular airlines that fly to Colorado from Seattle according to our data. Frontier is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 8 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

18 flights are operational daily from Seattle to Colorado as of September 2026. The most popular departure time for this route is 7:00PM, with 40% of flights per day taking off in the afternoon.

The number of flights available between Seattle and Colorado is 130 per week as of September 2026. The most frequent departure day is Wed, with 28% of weekly flights leaving on this day.