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Cheap flights from Philadelphia to Denver from £71

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — DEN
25 Aug — 1 Sep1
1 adult

Cheap flight deals from Philadelphia to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 20 August 2025.

Round-trip from

£141

One-way from

£71

Popular in

December

Cheapest in

September

Average price

£211
Frontier
  • Frontier
  • 2/10-9/10
  • 3 total stops
  • 26h 15m total
  • Philadelphia to Denver
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Southwest
  • Southwest
  • 17/9
  • Nonstop
  • 4h 00m total
  • Philadelphia to Denver
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Highest demand for flights based on searches. 4% potential increase in price (£8 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£4 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from Philadelphia to Denver

Cheapest flights from Philadelphia to Denver
Explore the most affordable flight options available from Philadelphia to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 August 2025.

Thu 2/1005:15PHL - DEN
2 stops18h 05mFrontier
Thu 9/1012:00DEN - PHL
1 stop8h 10mFrontier
Deal found 18/8£141
Sat 13/916:10PHL - DEN
Nonstop4h 05mSouthwest
Wed 17/912:30DEN - PHL
Nonstop3h 35mSouthwest
Deal found 19/8£141
Wed 17/912:15PHL - DEN
Nonstop3h 55mSouthwest
Mon 22/917:30DEN - PHL
Nonstop3h 35mSouthwest
Deal found 18/8£147
Tue 23/908:15PHL - DEN
1 stop6h 35mSouthwest
Sat 27/907:55DEN - PHL
Nonstop3h 40mSouthwest
Deal found 19/8£155
Tue 16/916:45PHL - DEN
Nonstop4h 00mSouthwest
Sun 21/918:55DEN - PHL
Nonstop3h 35mSouthwest
Deal found 18/8£158
Mon 15/918:40PHL - DEN
Nonstop4h 10mSouthwest
Wed 24/917:00DEN - PHL
Nonstop3h 30mSouthwest
Deal found 18/8£160
Tue 23/907:45PHL - DEN
Nonstop3h 50mSouthwest
Sun 28/918:55DEN - PHL
Nonstop3h 35mSouthwest
Deal found 19/8£162
Wed 3/1212:05PHL - DEN
1 stop6h 35mSouthwest
Wed 10/1210:55DEN - PHL
Nonstop3h 25mSouthwest
Deal found 18/8£167
Wed 24/916:45PHL - DEN
Nonstop4h 00mSouthwest
Sun 28/918:55DEN - PHL
Nonstop3h 35mSouthwest
Deal found 19/8£170
Mon 8/918:40PHL - DEN
Nonstop4h 10mSouthwest
Wed 10/910:25DEN - PHL
Nonstop3h 35mSouthwest
Deal found 18/8£171
Thu 25/911:45PHL - DEN
1 stop10h 50mSouthwest
Tue 30/917:00DEN - PHL
Nonstop3h 30mSouthwest
Deal found 19/8£172

Cheapflights Fare Finder

 
Customise your flight search to find flights from Philadelphia to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 20 August 2025.
Use the filters below to find and compare flights from Philadelphia to Denver that are best for you.

Fly from

Philadelphia

Fly to

Denver

Route

Depart

Return

Price

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Tue 16/9

12:15-14:10

Nonstop3h 55m

Denver Intl

Wed 17/9

12:30-18:05

Nonstop3h 35m

£141

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 13/9

07:35-09:30

Nonstop3h 55m

Denver Intl

Wed 17/9

12:30-18:05

Nonstop3h 35m

£141

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 13/9

07:35-09:30

Nonstop3h 55m

Denver Intl

Tue 16/9

10:25-16:00

Nonstop3h 35m

£141

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 19/9

08:00-10:04

Nonstop4h 04m

Denver Intl

Tue 23/9

13:45-19:20

Nonstop3h 35m

£147

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 4/10

07:15-09:25

Nonstop4h 10m

Denver Intl

Mon 6/10

18:55-00:20

Nonstop3h 25m

£147

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Thu 16/10

05:00-07:10

Nonstop4h 10m

Denver Intl

Sat 18/10

17:40-23:10

Nonstop3h 30m

£147

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Tue 7/10

16:45-18:55

Nonstop4h 10m

Denver Intl

Mon 13/10

18:55-00:20

Nonstop3h 25m

£147

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 26/9

18:40-20:50

Nonstop4h 10m

Denver Intl

Tue 30/9

17:00-22:30

Nonstop3h 30m

£147

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 31/10

08:30-10:40

Nonstop4h 10m

Denver Intl

Sat 1/11

17:40-23:10

Nonstop3h 30m

£147

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 31/10

08:30-10:40

Nonstop4h 10m

Denver Intl

Tue 4/11

17:15-22:35

Nonstop3h 20m

£147

Flights are sorted by cheapest return flights first.

Deals found on 19/8

Showing 1-10 of 19 results
1
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Best time to book a flight from Philadelphia to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Philadelphia with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Denver

How far ahead should I book a flight from Philadelphia to Denver?

Use this chart to determine the optimal time to book a return flight from Philadelphia to Denver. Price data was last updated on 8 August 2025.

Booking 40 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to Denver. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Philadelphia to Denver?

Currently, January is the cheapest month in which you can book a flight from Philadelphia to Denver (average of £667). Flying from Philadelphia to Denver in July is currently the most expensive (average of £985). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PHL to DEN?

Find hourly flight availability from Philadelphia to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 August 2025.

When flying from Philadelphia to Denver, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Philadelphia to Denver flight route?

    Flights from Philadelphia to Denver Intl have been viewed 3 times in the past calendar month.

  • How long is the flight from Philadelphia to Denver?

    Airlines like Southwest fly from Philadelphia to Denver in about 3h 55m. The time it takes to get you to your destination is usually consistent. Philadelphia and Denver are separated by a distance of 1553 mi. Most flights are nonstop.

  • What are the most reliable airlines from Philadelphia to Denver?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Philadelphia to Denver on time: Qatar Airways (81%), United Airlines (80%), Air Canada (77%).

  • Can I find deals for flights from Philadelphia to Denver that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Denver flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Denver.

  • Can I find deals for business class flights from Philadelphia to Denver?

    Yes. Cheapflights offers flight deals from Philadelphia to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Philadelphia to Denver?

    Currently, January is the cheapest month in which you can book a flight from Philadelphia to Denver (average of £667). Flying from Philadelphia to Denver in July is currently the most expensive (average of £985). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Winter Park
Frisco

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Philadelphia to Denver

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Denver flights
LaGuardia to Denver flights
Newark to Denver flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Philadelphia to Denver?

Deals for Philadelphia to Denver flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Philadelphia to Denver?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Philadelphia to Denver for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Philadelphia to Denver with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Philadelphia to Denver, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Philadelphia to Denver become cheaper?

Yes, Cheapflights offers price alerts on Philadelphia to Denver flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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