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$91+ Cheap flights from Colorado to Philadelphia (PHL)

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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — PHL
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Colorado to Philadelphia

Keep the following information in mind while searching for Colorado to Philadelphia flight deals. Data was last updated September 17, 2025.

Round-trip from

$176
(Frontier)

One-way from

$91
(Frontier)

Popular in

December

Cheapest in

August

Average price

$278

Good round-trip deal

$245 or less

Good one-way deal

$140 or less
From Colorado to Philadelphia
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One-way flight from Colorado to Philadelphia
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Highest demand for flights based on searches. 9% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Colorado to Philadelphia.
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Price to beat on a one-way flight from Colorado to Philadelphia.
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Find flight deals from Colorado to Philadelphia

Cheapest flights from Colorado to Philadelphia
Explore the most affordable flight options available from Colorado to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/811:45 pmDEN - PHL
Nonstop3h 34mFrontier
Mon 10/134:13 pmPHL - DEN
2 stops19h 19mFrontier
Deal found 9/15$176
This Frontier deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2812:59 amDEN - PHL
1 stop6h 13mFrontier
Fri 11/78:00 amPHL - DEN
1 stop7h 56mFrontier
Deal found 9/16$178
This Cheapflightsfares deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/297:01 pmDEN - PHL
1 stop24h 10mFrontier
Mon 10/610:11 amPHL - DEN
1 stop24h 53mFrontier
Deal found 9/15$179
This Cheapflightsfares deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2912:59 amDEN - PHL
1 stop7h 53mFrontier
Mon 11/36:19 amPHL - DEN
Nonstop4h 16mFrontier
Deal found 9/15$180
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2911:15 pmDEN - PHL
Nonstop3h 34mFrontier
Thu 11/67:10 amPHL - DEN
1 stop9h 00mFrontier
Deal found 9/15$181
This Flightnetwork deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3112:59 amDEN - PHL
1 stop8h 25mFrontier
Sun 11/27:54 pmPHL - DEN
1 stop26h 21mFrontier
Deal found 9/15$182
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:59 amDEN - PHL
1 stop6h 13mFrontier
Mon 10/1311:45 amPHL - DEN
1 stop13h 31mFrontier
Deal found 9/16$183
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/811:45 pmDEN - PHL
Nonstop3h 34mFrontier
Tue 10/145:25 pmPHL - DEN
1 stop17h 18mFrontier
Deal found 9/15$184
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/312:04 amDEN - PHL
1 stop18h 52mFrontier
Tue 10/75:35 pmPHL - DEN
1 stop17h 16mFrontier
Deal found 9/15$185
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3011:15 pmDEN - PHL
Nonstop3h 34mFrontier
Tue 11/49:30 pmPHL - DEN
1 stop13h 33mFrontier
Deal found 9/15$186
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/18:41 pmDEN - PHL
1 stop10h 32mFrontier
Wed 11/59:30 pmPHL - DEN
1 stop13h 33mFrontier
Deal found 9/15$188
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/411:56 amDRO - PHL
1 stop9h 50mAmerican Airlines
Thu 12/113:58 pmPHL - DRO
1 stop8h 03mAmerican Airlines
Deal found 9/15$298

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Philadelphia 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 2,558,603 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Colorado to Philadelphia that are best for you.

Fly from

Colorado

Fly to

Philadelphia

Route

Depart

Return

Price

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Sun 11/16

5:37 pm-11:09 pm

Nonstop3h 32m

Philadelphia

Wed 11/19

3:48 pm-6:08 pm

Nonstop4h 20m

$198

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Sat 11/15

9:35 am-3:00 pm

Nonstop3h 25m

Philadelphia

Tue 11/18

1:50 pm-6:10 pm

1 stop6h 20m

$208

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Tue 10/7

10:30 am-4:00 pm

Nonstop3h 30m

Philadelphia

Tue 10/14

6:30 pm-10:05 pm

1 stop5h 35m

$218

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Wed 10/1

5:32 pm-11:09 pm

Nonstop3h 37m

Philadelphia

Tue 10/7

10:00 am-12:06 pm

Nonstop4h 06m

$228

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Wed 1/14

5:55 pm-11:30 pm

Nonstop3h 35m

Philadelphia

Sat 1/17

3:43 pm-6:12 pm

Nonstop4h 29m

$239

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Tue 11/4

10:10 am-3:42 pm

Nonstop3h 32m

Philadelphia

Sat 11/8

3:48 pm-6:08 pm

Nonstop4h 20m

$239

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Thu 10/9

5:32 pm-11:09 pm

Nonstop3h 37m

Philadelphia

Tue 10/14

8:00 am-10:06 am

Nonstop4h 06m

$244

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Thu 10/30

6:00 am-3:57 pm

1 stop7h 57m

Philadelphia

Sun 11/2

5:00 am-9:11 am

1 stop6h 11m

$257

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Fri 11/7

6:20 pm-11:45 pm

Nonstop3h 25m

Philadelphia

Sun 11/9

7:00 am-9:10 am

Nonstop4h 10m

$257

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Wed 10/29

5:37 pm-11:09 pm

Nonstop3h 32m

Philadelphia

Tue 11/4

9:45 am-12:07 pm

Nonstop4h 22m

$258

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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Best time to book a flight from Colorado to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Colorado with our price prediction graph.
Estimated round-trip 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 Colorado to Philadelphia

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

Currently, August is the cheapest month in which you can book a flight from Colorado to Philadelphia (average of $236). Flying from Colorado to Philadelphia in March is currently the most expensive (average of $295). 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 CO to PHL?

Find hourly flight availability from Colorado to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Philadelphia as you normally would.

Weekly flight availability from Colorado to Philadelphia

Explore weekly flight availability from Colorado to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 17, 2025.

The most flights from USCO to PHL are scheduled on a Wednesday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).

Related info for your journey

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

  • What airport do you fly into for flights to Philadelphia from Colorado?

    For a flight from Colorado to Philadelphia, you will be flying into Philadelphia. Philadelphia (PHL) is just 7.0 mi from the center of the city.

  • How popular is this Colorado to Philadelphia flight route?

    Flights from Colorado to Philadelphia have been viewed 54 times in the past calendar month.

  • How long is the flight from Colorado to Philadelphia?

    United Airlines, Southwest, and Delta can get you from Colorado to Philadelphia in just under 3h 25m. Your travel time can differ by up to 4h 27m. There are 1553 mi between Colorado and Philadelphia. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Colorado to Philadelphia one-way?

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $119. Users have also found prices from $119 and $129 on United Airlines and Delta, respectively.

  • What are the most popular routes from Colorado to Philadelphia?

    Most travelers choose Denver Intl - Philadelphia, Colorado Springs - Philadelphia or Aspen Pitkin County - Philadelphia when deciding on the best route from Colorado to Philadelphia.

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

    Consider American Airlines (82%), United Airlines (78%) or British Airways (78%) when booking your flight. These represent the most reliable airlines when flying from Colorado to Philadelphia.

  • What are the cheapest flights from Colorado to Philadelphia?

    The cheapest flight price from Colorado to Philadelphia is $89. On average you can expect to pay $919. The most popular route, (Denver Intl - Philadelphia), can usually be booked for $138.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Colorado to Philadelphia 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 Colorado to Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from Colorado to Philadelphia (average of $236). Flying from Colorado to Philadelphia in March is currently the most expensive (average of $295). 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

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Vineland
Wildwood
King of Prussia
Pottstown
Reading
Dewey Beach
Ephrata
Camden
Ocean City
Cherry Hill
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace
Plymouth Meeting

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Colorado to Philadelphia

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Top 6 airlines flying from Colorado to Philadelphia

Discover the top 6 airlines that operate flights from Colorado to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$116Average$235FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$378FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$189Average$568FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$196Average$465FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$418FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$228Average$325FlexibilityNo cancel feeOn-time62%

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