Cheap flights from Colorado to Seattle from $115

In general, January is the cheapest month to fly from Colorado to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $30. If you don’t want to visit Seattle in January, then you should wait until August to fly from Colorado, when ticket prices are also cheap, with an average price of $222.

On average, the least expensive day to fly to Seattle from Colorado is on a Friday. momondo users have found tickets for Friday departures for as low as $279. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Tuesday is the most expensive day to depart from Colorado because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $383.

Flying to Seattle from Colorado in the evening is the least expensive time of day to depart. momondo users have found prices as low as $284 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $357. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Seattle from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $220 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Colorado for as low as $188 on momondo.

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

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

Frontier, Alaska Airlines and United Airlines are the top three most popular airlines that fly to Seattle from Colorado according to our data. Frontier is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

As of June 2026, 33 flights take off from Colorado and land in Seattle each day. The most common flight departure time for this route is 12:00PM, with 41% of daily flights taking off at noon.

As of June 2026, 237 flights take off from Colorado and land in Seattle each week. The most common flight departure day for this route is Mon, with 20% of weekly flights taking off on this day.