Cheap flights from Denver to the United States from $40

In general, January is the cheapest month to fly from Denver to United States. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $222. If you aren’t able to travel during the month of January, then book flights to United States from Denver during September instead. Flights to United States in September, while not as cheap as those in January, still average around $247.

According to our data, Thursday is the cheapest day to fly to United States from Denver. The lowest ticket price found for a Thursday departure recently was $330. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $491. These prices are subject to change though, so be sure to set up a Price Alert for flights to United States.

The cheapest time of day to fly to United States is in the afternoon when flights can be purchased for as low as $266. Try not to purchase tickets at noon because they tend to be around $558. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from Denver Intl to Las Vegas Harry Reid Intl for the best Denver Intl - United States flight prices

You are more likely to see cheaper flights to United States from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to United States for around $275 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United States from Denver for as low as $215 on momondo.

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

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

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to United States from Denver according to our data. Frontier is the first choice among our users, with 50% of people opting to fly with this airline when traveling to United States. Keep in mind that there are 9 different airlines that fly to United States on a routine basis, so you have a few additional options to choose from.

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

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

According to our data, Alpine Air Express have had the least number of delays on this route over the last 12 months; with about 9% of their flights experiencing any sort of delay.

The number of flights available between Denver and United States is 305 per day as of February 2026. The most frequent departure time is 12:00PM, with 36% of daily flights leaving at noon.

As of February 2026, there are 2,136 flights per week flying from Denver to United States. The most common day of the week flights depart is Fri, with 18% of flights taking off on this day.