Cheap flights from Philadelphia to Denver from $128

The cheapest month to fly to Denver from Philadelphia is in January. Flight prices, which tend to average around $305, 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 Philadelphia, when ticket prices are also cheap, with an average price of $320.

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $381. 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 $457.

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $275. Flights in the afternoon are often more expensive with an average ticket price of $449.

Fly from Philadelphia to Denver Intl for the best Philadelphia - Denver Intl flight prices

You are more likely to see cheaper flights to Denver from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $358 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Philadelphia for as low as $285 on momondo.

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

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

United Airlines, Frontier and American Airlines are the top three most popular airlines that fly to Denver from Philadelphia according to our data. United Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 6 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 Philadelphia and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 156 minutes.

Generally, flights departing at night 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, United Airlines have had the least number of delays on this route over the last 12 months; with about 12% of their flights experiencing any sort of delay.

As of August 2026, 12 flights take off from Philadelphia and land in Denver each day. The most common flight departure time for this route is 4:00PM, with 44% of daily flights taking off in the afternoon.

The number of flights available between Philadelphia and Denver is 87 per week as of August 2026. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.