Cheap flights from Philadelphia to Denver International

Compare Philadelphia to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

Book the best Denver International fare with no extra fees

Flight deals from Philadelphia to Denver International Airport

Looking for a cheap last-minute deal or the best round-trip flight from Philadelphia to Denver International Airport? If you want to travel next month, round-trip fares start from $68. Find the lowest prices on one-way and round-trip tickets right here.

Denver.$63 per passenger.Departing Tue, Apr 21, returning Tue, Apr 28.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from Philadelphia International on Tue, Apr 21, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, Apr 28, arriving in Philadelphia International.Price includes taxes and charges.From $63, select.

Denver.$63 per passenger.Departing Tue, Apr 21, returning Tue, May 5.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from Philadelphia International on Tue, Apr 21, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, May 5, arriving in Philadelphia International.Price includes taxes and charges.From $63, select.

Denver.$69 per passenger.Departing Tue, May 5, returning Tue, May 12.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from Philadelphia International on Tue, May 5, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, May 12, arriving in Philadelphia International.Price includes taxes and charges.From $69, select.

Denver.$69 per passenger.Departing Tue, May 26, returning Tue, Jun 2.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from Philadelphia International on Tue, May 26, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, Jun 2, arriving in Philadelphia International.Price includes taxes and charges.From $69, select.

Denver.$108 per passenger.Departing Tue, Jun 2, returning Tue, Jun 2.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Tue, Jun 2, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Jun 2, arriving in Philadelphia International.Price includes taxes and charges.From $108, select.

Denver.$163 per passenger.Departing Wed, Jul 1, returning Tue, Jul 7.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Wed, Jul 1, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Jul 7, arriving in Philadelphia International.Price includes taxes and charges.From $163, select.

Denver.$185 per passenger.Departing Sat, May 30, returning Sat, Aug 15.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Sat, May 30, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Sat, Aug 15, arriving in Philadelphia International.Price includes taxes and charges.From $185, select.

Denver.$199 per passenger.Departing Thu, Aug 6, returning Tue, Aug 11.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Thu, Aug 6, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Aug 11, arriving in Philadelphia International.Price includes taxes and charges.From $199, select.

Denver.$202 per passenger.Departing Tue, Jun 30, returning Tue, Jul 7.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Tue, Jun 30, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Tue, Jul 7, arriving in Philadelphia International.Price includes taxes and charges.From $202, select.

Denver.$202 per passenger.Departing Tue, Jun 2, returning Wed, Jun 10.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Philadelphia International on Tue, Jun 2, arriving in Denver International.Inbound direct flight with Southwest Airlines departing from Denver International on Wed, Jun 10, arriving in Philadelphia International.Price includes taxes and charges.From $202, select.

Denver.$205 per passenger.Departing Sat, Jul 11, returning Mon, Aug 10.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Sat, Jul 11, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Mon, Aug 10, arriving in Philadelphia International.Price includes taxes and charges.From $205, select.

Denver.$286 per passenger.Departing Fri, Sep 4, returning Mon, Sep 7.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Fri, Sep 4, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departing from Denver International on Mon, Sep 7, arriving in Philadelphia International.Price includes taxes and charges.From $286, select.

Denver.$337 per passenger.Departing Wed, Jul 1, returning Tue, Jul 7.Round-trip flight with United.Outbound direct flight with United departing from Philadelphia International on Wed, Jul 1, arriving in Denver International.Inbound direct flight with United departing from Denver International on Tue, Jul 7, arriving in Philadelphia International.Price includes taxes and charges.From $337, select.

Denver.$337 per passenger.Departing Tue, Jun 30, returning Thu, Jul 16.Round-trip flight with United.Outbound direct flight with United departing from Philadelphia International on Tue, Jun 30, arriving in Denver International.Inbound direct flight with United departing from Denver International on Thu, Jul 16, arriving in Philadelphia International.Price includes taxes and charges.From $337, select.

Denver.$472 per passenger.Departing Fri, Sep 4, returning Mon, Sep 7.Round-trip flight with United.Outbound direct flight with United departing from Philadelphia International on Fri, Sep 4, arriving in Denver International.Inbound direct flight with United departing from Denver International on Mon, Sep 7, arriving in Philadelphia International.Price includes taxes and charges.From $472, select.

Denver.$472 per passenger.Departing Thu, Aug 13, returning Mon, Aug 17.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Philadelphia International on Thu, Aug 13, arriving in Denver International.Inbound direct flight with Southwest Airlines departing from Denver International on Mon, Aug 17, arriving in Philadelphia International.Price includes taxes and charges.From $472, select.

Find the cheapest month to fly from Philadelphia to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia to Denver International flights are currently cheapest in April.

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Direct flights from Philadelphia to Denver International

Philadelphia to Denver International: Alternative routes

Compare routes from Philadelphia to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

Philadelphia to Denver: Flight information

The things to know before you go.

Cheapest flight found	$34
Cheapest month to fly	April
Average flight time	4 hrs, 15 mins
Most popular airline	American Airlines
Average flights per week	115

Finding cheap flights from Philadelphia to Denver International: Frequently asked questions

How much are round-trip flights from Philadelphia to Denver International?

The best price we found for a round-trip flight from Philadelphia to Denver International is $63. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Philadelphia to Denver International?

4 hours and 15 minutes is the average flight time from Philadelphia to Denver International.

Which airlines fly direct from Philadelphia to Denver International?

American Airlines, Southwest Airlines and United fly direct from Philadelphia to Denver International.

How many flights are there a week from Philadelphia to Denver International?

There are 115 flights per week flying from Philadelphia to Denver International, as of April 2026.

When is the cheapest time to fly from Philadelphia to Denver International?

The cheapest month to fly from Philadelphia to Denver International is usually April.

Which upcoming date is cheapest to fly from Philadelphia to Denver International Airport on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Philadelphia to Denver International Airport on Tuesday, April 21, 2026.

Can I get a direct flight from Philadelphia to Denver International Airport?

Yes – the average flight time is 4 hours and 15 minutes.

How can I find the best flight deal to Denver International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Denver?

We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly with from Philadelphia to Denver International?

The cheapest airline that flies to Denver International is Frontier Airlines.

Flying from Philadelphia to Denver International Airport (DEN): What you need to know

Begin your travels at one of Philadelphia's main airports, Philadelphia International Airport (PHL) or Trenton-Mercer Airport (TTN). Explore your options for booking a flight from Philadelphia to Denver International Airport (DEN) departing from either of these.
Take off on a direct Philadelphia to Denver International Airport flight and you'll be traveling for an average of 4 hours 10 minutes.
Denver is two hours behind Philadelphia. Denver International Airport is located in Denver, which follows the UTC-6 timezone.
Philadelphia International Airport (PHL) to Denver International Airport (DEN) is the most popular route. There are 50 direct weekly departures to choose from. If you have things to do before heading off, take the last flight with American Airlines at 9pm. Go for the first PHL to DEN departure with Southwest Airlines at 5am if you'd rather not wait around.
Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules worth sticking to. Show up at the airport on time to board your flight from Philadelphia to DEN.
Longer lines at check-in and security are more likely if you're flying during high season, so allow a little extra breathing room. The recommendation for peak times? Get there up to four hours early for international flights and at least two hours for domestic departures.

Airports in Philadelphia

Philadelphia International Airport (PHL)

You can find a direct flight from Philadelphia to Denver International Airport (DEN) leaving from Philadelphia International Airport (PHL).
Leading carriers that offer direct flights from Philadelphia to Denver International Airport leaving from PHL include:
Most travelers choose to book seats with United Airlines between PHL and DEN.
Among carriers on this route, United Airlines leads the way for on-time arrivals.
The journey from central Philadelphia to PHL takes around 45 minutes by public transport. If you drive, ride-share or grab a cab, you'll cover the 19 kilometers in 15 minutes or so, depending on traffic.
Want an easy start to your break? Stay near Philadelphia International Airport. Whether you're boarding an early flight from Philadelphia to Denver International Airport or prefer not to feel hurried, these hotels are just what you're after:
Of the departures from Philadelphia International Airport, 78.93% land on schedule at their destination.
PHL's address is 8500 Essington Ave.

Trenton-Mercer Airport (TTN)

TTN is about 56 kilometers from central Philadelphia. It takes 40 minutes or so to get to the airport if you're driving from the city center. Public transport takes approximately 1 hour 45 minutes.
Kick off your vacation early with an extra night away from home. Before your Philadelphia to DEN flight, stay in one of these hotels near Trenton-Mercer Airport:
Flights from Trenton-Mercer Airport have a proven record for punctuality, with 82.45% of them landing as expected.
You'll find TTN at Scotch Road, Terminal Building.

About Denver International Airport (DEN)

After your flight from Philadelphia to Denver International Airport has touched down, unwind and relax at a nearby hotel. Baymont by Wyndham Denver International Airport is a convenient option that's an easy drive from DEN.
Travel at your own pace with a Denver International Airport rental car. Pick up your wheels from Routes Car Rentals, Dollar or Budget and discover more of Denver and beyond.
Lock in the best deal by booking your ride around one week before your Philadelphia to Denver International Airport flight.
DEN is located at 8500 Pena Boulevard.

Getting from Denver International Airport (DEN) to central Denver

Denver International Airport to central Denver is around 31 kilometers. If you're getting a cab or renting a car, plan ahead to make your trip as easy as possible. Journey times will vary depending on traffic and the time of day.
Traveling by public transport takes roughly 1 hour 30 minutes.

How to find the cheapest flights from Philadelphia to Denver International Airport (DEN)

The cheapest price we've found for a one-way ticket from Philadelphia to Denver International Airport is $34. For a return flight on this route, the best price is $63. Depending on the availability when you book, these fares may change.
Don't leave everything to the last minute. You're more likely to find cheap flights from Philadelphia to DEN if you book ahead. Airlines often offer some excellent early bird discounts.
If you can be flexible with your travel dates, use the 'Whole month' tool. It'll show you the cheapest price in every month when searching for your Philadelphia to Denver International Airport ticket.
Locking in a cheap plane ticket from Philadelphia to DEN is a piece of cake with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you as soon as prices go down.
Chase down a great fare on a flight from Philadelphia to Denver International Airport with the help of the filters. Choose your preferred departure and arrival times, airlines and number of stops. You can also sort your results by 'Cheapest,' 'Best' or 'Fastest.'

The best time to fly from Philadelphia to Denver International Airport (DEN)

April is the quietest month for flights from Philadelphia to Denver International Airport (DEN), while July is the most popular. Choose the ideal time to visit Denver based on whether you want a lively atmosphere or a more laid-back vibe.
Before locking in your Philadelphia to DEN plane ticket, consider the weather you're most comfortable in. July is the warmest month in Denver, with temperatures ranging from 14ºC (57ºF) to 32ºC (90ºF).
January has temperatures of between -9ºC (16ºF) and 7ºC (45ºF). Look for cheap tickets from Philadelphia to Denver International Airport around that time if you'd rather travel in cooler conditions.

More about Denver

After booking your flight from Philadelphia to Denver International Airport, find a hotel that puts you in a great location. Make one of these accommodation options your base for exploring Denver:
There are so many things to see and do in this city, it can be difficult to know where to begin. Denver Art Museum, Meow Wolf Denver | Convergence Station and Ballpark are leading attractions which should be on every Denver itinerary.

Explore more of the United States

Denver is easy to fall in love with, but there are so many other corners of the United States just waiting to be discovered. Around 113 kilometers south of Denver, a trip to Colorado Springs will keep you busy. Start with leading sights like Garden of the Gods, Pikes Peak Region Attractions and Red Rock Canyon.
Pueblo is another well-known destination in the United States and is around 177 kilometers south of Denver. No journey is complete without a visit to Cathedral of the Sacred Heart, Rosemount Museum and Minnequa Lake Park.