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$113+ 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — DEN
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to Denver Intl are usually found in September or October, booked 33 days in advance, depart on a Wednesday 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 July 28, 2025.

Round-trip from

$187
(CheapOair)

One-way from

$113
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$286

Good round-trip deal

$218 or less

Good one-way deal

$139 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. 5% potential increase in price ($16 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 July 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 July 28, 2025.

This CheapOair deal was found by Cheapflights users on 7/27. 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.
Wed 8/136:15 amPHL - DEN
Nonstop4h 13mFrontier
Thu 8/2111:15 pmDEN - PHL
Nonstop3h 39mFrontier
Deal found 7/27$187
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Wed 9/177:40 pmPHL - DEN
Nonstop4h 10mAmerican Airlines
Sat 9/207:00 amDEN - PHL
Nonstop3h 36mAmerican Airlines
Deal found 7/27$197
This JetBlue deal was found by Cheapflights users on 7/26. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/23:55 pmPHL - DEN
1 stop7h 47mJetBlue
Mon 10/610:44 pmDEN - PHL
1 stop8h 38mJetBlue
Deal found 7/26$229

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 July 28, 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

Wed 8/13

6:15 am-8:28 am

Nonstop4h 13m

Denver Intl

Thu 8/21

11:15 pm-4:54 am

Nonstop3h 39m

$187

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 9/17

7:40 pm-9:50 pm

Nonstop4h 10m

Denver Intl

Sat 9/20

7:00 am-12:36 pm

Nonstop3h 36m

$197

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Thu 10/2

3:55 pm-9:42 pm

1 stop7h 47m

Denver Intl

Sun 10/5

10:39 pm-9:22 am

1 stop8h 43m

$229

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Mon 10/6

6:03 pm-11:38 pm

1 stop7h 35m

$113

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Mon 8/11

9:12 pm-9:17 pm

1 stop26h 05m

$115

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Tue 8/19

8:40 am-10:40 am

Nonstop4h 00m

$116

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sun 9/21

8:00 am-10:04 am

Nonstop4h 04m

$119

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 10/1

3:55 pm-10:56 pm

1 stop9h 01m

$125

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 9/6

2:20 pm-6:40 pm

1 stop6h 20m

$126

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Mon 8/25

4:59 pm-10:55 pm

1 stop7h 56m

$129

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 11 results
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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
Airlines
Frontier

Frontier's UpFront Plus seats guarantee an empty middle seat for added comfort.


Frontier offers Zone 1 boarding with a carry-on bag or special fare bundle purchase.

Read more about Frontierby Marisa Garcia
United Airlines

Basic Economy on United allows a personal item only, no carry-on bags without extra fees.


United Economy Plus offers extra legroom seats towards the front of the economy cabin.

Read more about United Airlinesby Harriet Baskas
Southwest

Southwest allows two free checked bags, including oversized items like skis.


Southwest offers free in-flight entertainment streamed to personal devices, including movies and live TV.

Read more about Southwestby Marisa Garcia
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
Marisa Garcia

Marisa Garcia

Expert on Frontier and Southwest

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
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 July 25, 2025.

Booking 33 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 July 28, 2025.

It’s typically best to fly out from Philadelphia to Denver in the evening. Doing so could potentially save you 44% 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 July 27, 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.

Weekly flight availability from Philadelphia to Denver

Explore weekly flight availability from Philadelphia to Denver. 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 July 28, 2025.

The most flights from PHL to DEN are scheduled on a Monday (17 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (10 on average).

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 July 28, 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
4,237 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,975 reviews
Southwest
8.0
Very good
4,237 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,892 reviews
Southwest
8.0
Very good
4,237 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
JetBlue
7.3
Good
2,914 reviews
Southwest
8.0
Very good
4,237 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,237 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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 55m 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 128 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Currently priced at $187, Frontier will fly you from Philadelphia to Denver and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and JetBlue - these airlines can fly you to your destination from $197 and $229, respectively. Frontier is priced at 39% lower than the current average price of a flight leaving 3 months from now.

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

    One-way options have recently been found by users for as low as $113 on Frontier. Other airlines that offer cheap prices include American Airlines from $116 and United Airlines from $119 one-way.

  • 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 Air Canada (72%), United Airlines (68%) or Qatar Airways (66%) 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 $1,034 for a flight from Philadelphia to Denver. The cheapest flight overall is $94 while the most popular route, (Philadelphia - Denver Intl) is currently priced at $146.

  • 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
Westminster
Black Hawk
Winter Park
Lakewood
Cripple Creek
Brighton
Silverthorne
Golden
Thornton
Greeley
Frisco
Grand Lake
Manitou Springs
Central City
Fort Morgan
Glendale
Copper Mountain
Wheat Ridge
Longmont
Broomfield

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.
LaGuardia to Denver flights
John F Kennedy Intl to Denver flights
Newark to Denver flights
Dulles Intl to Denver flights
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Harrisburg to Denver flights
John F Kennedy Intl to Vail flights
Reagan-National to Durango flights
State College to Denver flights
Newark to Durango flights
Dulles Intl to Aspen flights
Pittsburgh to Colorado Springs flights
Philadelphia to Hayden flights
LaGuardia to Durango flights
LaGuardia to Hayden flights
Dulles Intl to Vail flights
John F Kennedy Intl to Montrose flights
Philadelphia to Durango flights
Reagan-National to Vail flights
Dulles Intl to Grand Junction flights
Reagan-National to Aspen flights
Newark to Gunnison flights
Reagan-National to Grand Junction flights
Philadelphia to Colorado Springs flights
Dulles Intl to Montrose flights
Philadelphia to Aspen flights
LaGuardia to Gunnison flights
Dulles Intl to Hayden 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 July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$103Average$224FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$106Average$205FlexibilityNo cancel feeOn-time88%
DeltaCheapest$134Average$266FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$186Average$362FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$191Average$333FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$193Average$416FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$207Average$325FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$251Average$275FlexibilityNo cancel feeOn-time83%

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