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$87+ Cheap flights from Philadelphia to Denver (PHL - DEN)

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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — DEN
Oct 20 — Oct 271
Mon 10/20
Mon 10/27
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to Denver Intl are usually found in August or October, booked 40 days in advance, depart on a Thursday or Friday and return on a Thursday

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 September 20, 2025.

Round-trip from

$167
(CheapOair)

One-way from

$87
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$290

Good round-trip deal

$245 or less

Good one-way deal

$149 or less
From Philadelphia to Denver Intl
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One-way flight from Philadelphia to Denver Intl
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Highest demand for flights based on searches. 6% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 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 Philadelphia to Denver Intl.
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Price to beat on a one-way flight from Philadelphia to Denver Intl.
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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 September 20, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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 10/13:55 pmPHL - DEN
1 stop30h 03mFrontier
Thu 10/211:59 pmDEN - PHL
1 stop12h 39mFrontier
Deal found 9/18$167
This Priceline deal was found by Cheapflights users on 9/18. 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.
Fri 10/175:12 pmPHL - DEN
1 stop7h 47mFrontier
Mon 10/2011:59 pmDEN - PHL
1 stop8h 35mFrontier
Deal found 9/18$168
This Priceline deal was found by Cheapflights users on 9/19. 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 10/26:45 amPHL - DEN
Nonstop4h 12mFrontier
Fri 10/311:59 pmDEN - PHL
1 stop11h 56mFrontier
Deal found 9/19$169
This Booking.com deal was found by Cheapflights users on 9/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:00 amPHL - DEN
1 stop16h 01mFrontier
Sat 11/112:16 amDEN - PHL
1 stop23h 58mFrontier
Deal found 9/20$170
This CheapOair deal was found by Cheapflights users on 9/19. 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.
Tue 10/711:34 amPHL - DEN
1 stop13h 42mFrontier
Wed 10/86:01 amDEN - PHL
1 stop8h 40mFrontier
Deal found 9/19$171
This CheapOair deal was found by Cheapflights users on 9/18. 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 10/175:05 pmPHL - DEN
1 stop17h 28mFrontier
Mon 10/274:17 pmDEN - PHL
1 stop16h 17mFrontier
Deal found 9/18$172
This Frontier deal was found by Cheapflights users on 9/19. 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 10/166:42 amPHL - DEN
Nonstop4h 16mFrontier
Fri 10/2411:45 pmDEN - PHL
Nonstop3h 34mFrontier
Deal found 9/19$173
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/158:15 amPHL - DEN
1 stop9h 26mFrontier
Fri 10/1711:45 pmDEN - PHL
Nonstop3h 34mFrontier
Deal found 9/18$174
This Priceline deal was found by Cheapflights users on 9/18. 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 10/166:42 amPHL - DEN
Nonstop4h 16mFrontier
Thu 10/2311:45 pmDEN - PHL
Nonstop3h 34mFrontier
Deal found 9/18$175
This Frontier deal was found by Cheapflights users on 9/18. 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 10/1511:34 amPHL - DEN
1 stop13h 42mFrontier
Mon 10/277:49 amDEN - PHL
1 stop11h 04mFrontier
Deal found 9/18$176
This Kiwi.com deal was found by Cheapflights users on 9/18. 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.
Fri 10/175:12 pmPHL - DEN
1 stop7h 47mFrontier
Sat 10/1810:20 amDEN - PHL
1 stop10h 10mFrontier
Deal found 9/18$178
This Frontier deal was found by Cheapflights users on 9/18. 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 11/66:19 amPHL - DEN
Nonstop4h 16mFrontier
Thu 11/1312:05 pmDEN - PHL
1 stop10h 34mFrontier
Deal found 9/18$179

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated September 20, 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

Fri 10/24

6:10 pm-8:20 pm

Nonstop4h 10m

Denver Intl

Sat 11/1

5:40 pm-11:10 pm

Nonstop3h 30m

$198

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 12/3

4:32 pm-11:04 pm

1 stop8h 32m

Denver Intl

Mon 12/8

11:59 pm-9:39 am

1 stop7h 40m

$245

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 12/10

4:32 pm-11:04 pm

1 stop8h 32m

Denver Intl

Mon 12/15

11:59 pm-9:39 am

1 stop7h 40m

$245

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 12/13

6:15 am-12:50 pm

1 stop8h 35m

Denver Intl

Mon 12/15

12:50 am-11:31 am

1 stop8h 41m

$257

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 10/25

6:00 am-12:30 pm

2 stops8h 30m

Denver Intl

Sat 11/1

6:45 am-4:25 pm

1 stop7h 40m

$262

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 10/15

7:20 am-9:30 am

Nonstop4h 10m

Denver Intl

Sat 10/18

8:15 am-3:40 pm

1 stop5h 25m

$267

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 10/10

5:05 pm-8:33 am

1 stop17h 28m

Denver Intl

Sat 10/11

11:59 pm-10:26 am

2 stops32h 27m

$273

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 10/15

6:00 am-11:55 am

1 stop7h 55m

Denver Intl

Sat 10/18

8:57 am-2:35 pm

Nonstop3h 38m

$293

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 1/23

1:10 pm-5:57 pm

1 stop6h 47m

Denver Intl

Wed 1/28

5:55 pm-11:30 pm

Nonstop3h 35m

$301

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 11/14

5:45 am-9:25 am

1 stop5h 40m

Denver Intl

Wed 11/19

9:30 am-9:00 pm

2 stops9h 30m

$302

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/19

Showing 1-10 of 24 results
1
2
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The best insider tips for Philadelphia to Denver flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to Denver trip
Airports
PHL

For a quick check-in, verify your airline’s terminal before arriving. Terminals are spread out, and only some are linked by indoor walkways.

Read more about PHLby Mark Chesnut
DEN

Take the A Line train from DEN to Union Station for a cost-effective and efficient ride into downtown Denver.

Read more about DENby Emily Zemler
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut

Mark Chesnut

Mark Chesnut is a travel writer and public speaker with more than 30 years of experience. The 2019 winner of the NLGJA Excellence in Travel Writing Award, Mark is the author of the book “Prepare for Departure” and has covered air travel for multiple top consumer and trade media outlets.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more

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 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 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 round-trip flight from Philadelphia to Denver. Price data was last updated on September 12, 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, October is the cheapest month in which you can book a flight from Philadelphia to Denver (average of $197). Flying from Philadelphia to Denver in March is currently the most expensive (average of $278). 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 September 20, 2025.

It’s typically best to fly out from Philadelphia to Denver at noon. Doing so could potentially save you 37% on the flight price compared to flying in the afternoon, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from Philadelphia to Denver. Price data was last updated on September 14, 2025.

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

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated September 20, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from Philadelphia to Denver to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,966 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,926 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,171 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • What airports do I use to fly from Philadelphia to Denver?

    Booking a flight from Philadelphia (PHL) to Denver Intl (DEN) is your only option if you wish to fly from Philadelphia to Denver. On a typical day, there are 14 flights from Philadelphia to Denver Intl, all of which are around 3h 58m for a nonstop flight. You can also purchase a plane ticket from 8 airlines when you book a flight from Philadelphia to Denver.

  • How popular is this Philadelphia to Denver flight route?

    The Philadelphia to Denver Intl flight path was viewed by 127 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Philadelphia to Denver?

    Airlines like JetBlue, Delta, and Southwest fly from Philadelphia to Denver in about 5h 52m. The time it takes to get you to your destination can typically vary by up to 2h 40m. Philadelphia and Denver are separated by a distance of 1553 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Philadelphia to Denver round-trip?

    Currently priced at $106, Allegiant Air will fly you from Philadelphia to Denver and back. In addition to Allegiant Air, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Delta - these airlines can fly you to your destination from $111 and $134, respectively. Allegiant Air is priced at 66% lower than the current average price of a flight leaving 3 months from now.

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

    No one likes to see their flight delayed. When booking a flight from Philadelphia to Denver consider choosing Aer Lingus (100%), Air Canada (86%) or Qatar Airways (85%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Philadelphia to Denver?

    On average you can expect to pay $686 for a flight from Philadelphia to Denver. The cheapest flight overall is $85 while the most popular route, (Philadelphia - Denver Intl) is currently priced at $144.

  • 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 vacation 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, October is the cheapest month in which you can book a flight from Philadelphia to Denver (average of $197). Flying from Philadelphia to Denver in March is currently the most expensive (average of $278). 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk
Westminster
Golden
Winter Park
Lakewood
Broomfield
Greeley
Lone Tree
Cripple Creek
Thornton
Silverthorne
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker
Sterling

Browse thousands of different options on Cheapflights for your next trip

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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
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Pittsburgh to Colorado Springs flights
Reagan-National to Montrose flights
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Philadelphia to Montrose flights

Top 8 airlines flying from Philadelphia to Denver

Discover the top 8 airlines that operate flights from Philadelphia to Denver. 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 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$106Average$197FlexibilityNo cancel feeOn-time88%
FrontierCheapest$111Average$229FlexibilityNo cancel feeOn-time62%
DeltaCheapest$134Average$272FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$193Average$338FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$195Average$422FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$196Average$368FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$207Average$314FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$251Average$280FlexibilityNo cancel feeOn-time83%

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