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$78+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — PHL
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap 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 December 15, 2025.

This Expedia deal was found by Cheapflights users on 12/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:05 amDEN - PHL
1 stop16h 21mFrontier
Wed 1/73:48 pmPHL - DEN
1 stop18h 36mFrontier
Deal found 12/15$165
This Kiwi.com deal was found by Cheapflights users on 12/13. 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 12/256:05 amDEN - PHL
1 stop8h 51mFrontier
Fri 1/309:02 pmPHL - DEN
1 stop17h 26mFrontier
Deal found 12/13$194
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/296:05 amDEN - PHL
1 stop16h 21mFrontier
Wed 12/3111:45 amPHL - DEN
1 stop28h 30mFrontier
Deal found 12/14$196
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/256:05 amDEN - PHL
1 stop8h 51mFrontier
Wed 12/3111:45 amPHL - DEN
1 stop28h 30mFrontier
Deal found 12/14$203
This Frontier deal was found by Cheapflights users on 12/14. 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.
Thu 12/256:05 amDEN - PHL
1 stop8h 51mFrontier
Mon 1/58:36 pmPHL - DEN
Nonstop4h 23mFrontier
Deal found 12/14$207
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Mon 12/296:05 amDEN - PHL
1 stop16h 21mFrontier
Thu 1/17:18 pmPHL - DEN
1 stop28h 31mFrontier
Deal found 12/15$208
This Priceline deal was found by Cheapflights users on 12/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:05 amDEN - PHL
1 stop8h 51mFrontier
Mon 1/195:30 amPHL - DEN
1 stop8h 51mFrontier
Deal found 12/15$216
This American Airlines deal was found by Cheapflights users on 12/12. 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 12/256:00 amCOS - PHL
1 stop6h 56mAmerican Airlines
Thu 1/15:00 amPHL - COS
1 stop8h 47mAmerican Airlines
Deal found 12/12$237
This Delta deal was found by Cheapflights users on 12/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/293:08 pmMTJ - PHL
1 stop7h 19mDelta
Sun 1/48:05 amPHL - MTJ
1 stop8h 07mDelta
Deal found 12/14$324
This United Airlines deal was found by Cheapflights users on 12/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:49 pmCOS - PHL
2 stops9h 56mUnited Airlines
Thu 1/16:35 amPHL - COS
1 stop6h 49mUnited Airlines
Deal found 12/12$333
This Delta deal was found by Cheapflights users on 12/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2911:50 amEGE - PHL
1 stop6h 43mDelta
Thu 1/16:00 amPHL - EGE
1 stop6h 45mDelta
Deal found 12/14$359
This Delta deal was found by Cheapflights users on 12/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/233:35 pmEGE - PHL
1 stop6h 52mDelta
Mon 1/57:00 amPHL - EGE
1 stop9h 05mDelta
Deal found 12/12$384

Find flight deals from Colorado to Philadelphia

Keep the following information in mind while searching for Colorado to Philadelphia flight deals. Data was last updated December 15, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$155
(Frontier)

One-way from

$78
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$404

Good round-trip deal

$250 or less

Good one-way deal

$151 or less
Provider with most accurate pricing for Denver Intl-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Philadelphia flights.
Search Deals
From Colorado to Philadelphia
Search Deals
One-way flight from Colorado to Philadelphia
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Colorado to Philadelphia.
Search Deals
Price to beat on a one-way flight from Colorado to Philadelphia.
Search Deals

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 December 15, 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

Tue 1/13

5:55 pm-11:30 pm

Nonstop3h 35m

Philadelphia

Tue 1/20

10:10 am-4:34 pm

1 stop8h 24m

$233

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Wed 12/24

2:30 pm-12:30 am

1 stop8h 00m

Philadelphia

Thu 12/25

6:05 am-10:29 am

1 stop6h 24m

$237

Colorado SpringsPhiladelphia

COS - PHL

COSPHL

Colorado Springs

Thu 12/25

6:00 am-2:56 pm

1 stop6h 56m

Philadelphia

Thu 1/1

5:00 am-11:47 am

1 stop8h 47m

$237

Grand JunctionPhiladelphia

GJT - PHL

GJTPHL

Grand Junction Regnl

Tue 1/13

3:21 pm-11:30 pm

1 stop6h 09m

Philadelphia

Tue 1/20

3:43 pm-8:38 pm

1 stop6h 55m

$249

Grand JunctionPhiladelphia

GJT - PHL

GJTPHL

Grand Junction Regnl

Sat 1/10

6:00 am-2:53 pm

1 stop6h 53m

Philadelphia

Sat 1/17

6:21 am-12:16 pm

1 stop7h 55m

$249

MontrosePhiladelphia

MTJ - PHL

MTJPHL

Montrose County

Wed 1/14

2:05 pm-10:06 pm

1 stop6h 01m

Philadelphia

Fri 1/16

5:40 am-1:08 pm

1 stop9h 28m

$249

Grand JunctionPhiladelphia

GJT - PHL

GJTPHL

Grand Junction Regnl

Sat 1/10

1:38 pm-11:30 pm

1 stop7h 52m

Philadelphia

Sat 1/17

10:10 am-8:18 pm

2 stops12h 08m

$254

MontrosePhiladelphia

MTJ - PHL

MTJPHL

Montrose County

Wed 1/7

2:05 pm-10:06 pm

1 stop6h 01m

Philadelphia

Mon 1/12

5:40 am-1:08 pm

1 stop9h 28m

$274

DenverPhiladelphia

DEN - PHL

DENPHL

Denver Intl

Tue 1/13

10:50 am-9:55 pm

2 stops9h 05m

Philadelphia

Tue 1/20

5:40 am-12:15 pm

2 stops8h 35m

$279

HaydenPhiladelphia

HDN - PHL

HDNPHL

Hayden Yampa Valley

Thu 2/5

7:00 am-3:50 pm

1 stop6h 50m

Philadelphia

Sun 2/8

6:30 am-10:55 am

1 stop6h 25m

$288

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

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, October is the cheapest month in which you can book a flight from Colorado to Philadelphia (average of $65). Flying from Colorado to Philadelphia in June is currently the most expensive (average of $149). 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 December 15, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 29% on flights from Colorado to Philadelphia by exploring options for tickets in the evening.

What is the cheapest day to fly from Colorado to Philadelphia?

Use this chart to determine the cheapest time to fly round-trip from Colorado to Philadelphia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Colorado to Philadelphia flight should consider departing on Friday afternoons when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 15, 2025.

The most flights from USCO to PHL are scheduled on a Monday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 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 76 times in the past calendar month.

  • How long is the flight from Colorado to Philadelphia?

    United Airlines, Delta, and American Airlines can get you from Colorado to Philadelphia in just under 3h 35m. Your travel time can differ by up to 4h 25m. 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 Frontier. According to our data, you can fly for as low as $65. Users have also found prices from $91 and $92 on Southwest and American Airlines, respectively.

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

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

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

    Consider Aer Lingus (92%), American Airlines (86%) or Frontier (85%) 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 $59. On average you can expect to pay $1,167. The most popular route, (Denver Intl - Philadelphia), can usually be booked for $148.

  • 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, October is the cheapest month in which you can book a flight from Colorado to Philadelphia (average of $65). Flying from Colorado to Philadelphia in June is currently the most expensive (average of $149). 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
Wildwood
Pottstown
King of Prussia
Reading
Ocean City
Cherry Hill
Lewes
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Newark
Millville
Chester

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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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$122Average$237FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$122Average$261FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$401FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$185Average$520FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$202Average$448FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$204Average$429FlexibilityNo cancel feeOn-time63%

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