Cheap flights from the United States to Denver from $31

The cheapest month to fly to Denver from United States is in January. Flight prices, which tend to average around $267, 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 United States, when ticket prices are also cheap, with an average price of $277.

The cheapest day to depart on your flight to Denver is on a Wednesday when prices can be found for as low as $359. 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 $440.

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $279. Flights in the morning are often more expensive with an average ticket price of $411.

Fly from San Francisco to Denver Intl for the best United States - Denver Intl flight prices

You are more likely to see cheaper flights to Denver from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $282 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from United States for as low as $263 on momondo.

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

United Airlines, Southwest, and Frontier are the most popular carriers operating from United States to Denver Intl

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Denver from United States according to our data. Frontier is the first choice among our users, with 49% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 10 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

Historically, on average around 18% of flights between United States and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 144 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday 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 14% of their flights experiencing any sort of delay.

As of February 2026, there are 81 flights per day flying from United States to Denver. The most common time of day flights depart is 8:00AM, with 37% of flights taking off in the afternoon.

As of February 2026, there are 571 flights per week flying from United States to Denver. The most common day of the week flights depart is Tue, with 35% of flights taking off on this day.