Cheap flights from Seattle to Denver from $118

The cheapest month to fly to Denver from Seattle is in January. Flight prices, which tend to average around $161, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in January, then you should wait until October to fly from Seattle, when ticket prices are also cheap, with an average price of $194.

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $297. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $366.

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $261. Flights in the morning are often more expensive with an average ticket price of $350.

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

You are more likely to see cheaper flights to Denver from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $230 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Seattle for as low as $183 on momondo.

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

Delta, Southwest, and Frontier are the most popular carriers operating from Seattle/Tacoma Intl to Denver Intl

Frontier, Alaska Airlines and Delta are the top three most popular airlines that fly to Denver from Seattle according to our data. Frontier is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 7 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

Historically, on average around 19% of flights between Seattle and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 136 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

The number of flights available between Seattle and Denver is 28 per day as of July 2026. The most frequent departure time is 7:00PM, with 48% of daily flights leaving in the afternoon.

As of July 2026, there are 197 flights per week flying from Seattle to Denver. The most common day of the week flights depart is Thu, with 21% of flights taking off on this day.