$81 Cheap Flights from Denver (DEN) to Philadelphia (PHL)

View $81 flight on Wed, May 21, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)

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Find available prices by choosing your travel dates.

Cheap Flights from Denver to Philadelphia (DEN-PHL)

Prices were available within the past 7 days and start at $81 for one-way flights and $147 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, May 10 - Sat, May 17
DEN
Denver
PHL
Philadelphia
$147 Roundtrip, found 1 hour ago
$147
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, May 10 from Denver to Philadelphia, returning Sat, May 17, priced at $147 found 1 hour ago
Frontier Airlines
Sat, May 10 - Sat, May 24
DEN
Denver
PHL
Philadelphia
$151 Roundtrip, found 17 hours ago
$151
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Sat, May 10 from Denver to Philadelphia, returning Sat, May 24, priced at $151 found 17 hours ago
Frontier Airlines
Sat, May 10 - Mon, May 12
DEN
Denver
PHL
Philadelphia
$157 Roundtrip, found 4 hours ago
$157
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, May 10 from Denver to Philadelphia, returning Mon, May 12, priced at $157 found 4 hours ago
Southwest Airlines
Tue, May 13 - Tue, May 27
DEN
Denver
PHL
Philadelphia
$177 Roundtrip, found 5 days ago
$177
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Tue, May 13 from Denver to Philadelphia, returning Tue, May 27, priced at $177 found 5 days ago
Frontier Airlines
Tue, May 27 - Wed, May 28
DEN
Denver
PHL
Philadelphia
$179 Roundtrip, found 1 hour ago
$179
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Tue, May 27 from Denver to Philadelphia, returning Wed, May 28, priced at $179 found 1 hour ago
Frontier Airlines
Sat, May 10 - Tue, May 20
DEN
Denver
PHL
Philadelphia
$180 Roundtrip, found 5 hours ago
$180
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sat, May 10 from Denver to Philadelphia, returning Tue, May 20, priced at $180 found 5 hours ago
Frontier Airlines
Sat, May 10 - Mon, May 19
DEN
Denver
PHL
Philadelphia
$183 Roundtrip, found 7 hours ago
$183
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Sat, May 10 from Denver to Philadelphia, returning Mon, May 19, priced at $183 found 7 hours ago
American Airlines
Wed, Jul 9 - Tue, Jul 15
DEN
Denver
PHL
Philadelphia
$191 Roundtrip, found 7 hours ago
$191
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Wed, Jul 9 from Denver to Philadelphia, returning Tue, Jul 15, priced at $191 found 7 hours ago
United
Tue, May 27 - Wed, May 28
DEN
Denver
PHL
Philadelphia
$193 Roundtrip, found 1 hour ago
$193
Roundtrip
found 1 hour ago
Select United flight, departing Tue, May 27 from Denver to Philadelphia, returning Wed, May 28, priced at $193 found 1 hour ago
JetBlue Airways
Sat, May 31 - Sat, Jun 7
DEN
Denver
PHL
Philadelphia
$229 Roundtrip, found 12 hours ago
$229
Roundtrip
found 12 hours ago
Select JetBlue Airways flight, departing Sat, May 31 from Denver to Philadelphia, returning Sat, Jun 7, priced at $229 found 12 hours ago
Flights from Denver (DEN) to Philadelphia (PHL)
Origin airport
Denver Intl.
Destination airport
Philadelphia Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$147
Distance
1553 mi

Denver to Philadelphia Flights

The cheapest times to fly from Denver to Philadelphia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Denver to Philadelphia are during the month of May. You can find some of the cheapest flights from Denver to Philadelphia with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Denver to Philadelphia

Sunday is one of the best days to book for cheap flights from Denver to Philadelphia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Denver to Philadelphia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Denver to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $81 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Denver to Philadelphia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Denver to Philadelphia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL) cost?
Cheap return fares from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL) start at $173. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Southwest Airlines and Frontier Airlines flight leaving DEN on May 10 2025 and touching down at PHL. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from DEN to PHL?
The cheapest flights from DEN to PHL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)?
You can pick from 4 carriers that fly direct from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL). Including:

  • United Airlines
  • American Airlines
  • Southwest Airlines

What is the cheapest airline that flies from DEN to PHL?
Journey from DEN to PHL with Southwest Airlines. This carrier currently offers the cheapest one-way ticket on this route, starting at $81. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from DEN on May 13 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)?
With, on average, 6 direct flights departing from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL) each day, you’ll be soaring through the skies in no time.
What are the most popular departure times for flights from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)?
More people fly between DEN and PHL at 5 PM than at any other time of day. Prefer a quieter experience? Consider flying outside peak hours and it’s possible you’ll save on your fare as well.
What day of the week has the most flights from DEN to PHL?
Depart on a Sunday if you’re after the best choice of flights from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL).
What is the earliest flight from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)?
Hop on the earliest flight at around 6:37AM UTC-7, departing from Denver Intl. Airport (DEN). You’ll be traveling for around 3h 49m, arriving at Philadelphia Intl. Airport (PHL) at approximately 12:26PM UTC-5.
How long does it take to fly from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)?
It takes approximately 3 hours and 35 minutes to travel the 1,550 mi from DEN to PHL.
What airline has the least delays from DEN to PHL?
American Airlines has the best performance for on-time direct flights from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL), with an on-time score of 84%. Use the Expedia App to see your flight status before you head off and get real-time alerts about any trip changes.
What is the best time to fly from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)?
To reach Philadelphia Intl. Airport (PHL) on time, pick a flight that leaves Denver Intl. Airport (DEN) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Philadelphia from Denver Intl. Airport (DEN)?
Philadelphia Intl. Airport (PHL) is the only airport in Philadelphia with direct flights from Denver Intl. Airport (DEN). Browse the available options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL) last-minute?
Last-minute fares from DEN to PHL are typically more expensive. To lock in the lowest prices, start searching for flights as early as possible. That said, if you’re flexible with your travel plans, it’s possible to land a cheap fare right before you leave.
Is it cheaper to book a DEN to PHL flight and hotel package?
You’ll typically save money by securing a DEN to PHL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it’s simple to manage everything in one convenient place. Once you’ve chosen your ideal flights and accommodations, you can add extras such as tours, car rentals and activities.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL)?
Typically, you can cancel or reschedule your DEN to PHL flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline’s guidelines and fees on flight changes, or if you need more details, go to our Customer Service portal.

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*Available to One Key members.