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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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — DEN
oct. 30 — nov. 61
jue. 10/30
jue. 11/6
1 adult, Economy
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Find cheap flights from Philadelphia to Denver with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from Philadelphia to Denver Intl are usually found in August or July, booked 40 days in advance, depart on a Friday or Thursday 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 septiembre 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$164
(Cheapflightsfares)

One-way from

$87
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$296

Good round-trip deal

$260 or less

Good one-way deal

$145 or less
Provider with most accurate pricing for Philadelphia-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Philadelphia-Denver Intl flights.
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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 ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% 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 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 septiembre 30, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
dom. 10/268:34 amPHL - DEN
1 stop26h 09mFrontier
mar. 10/2812:59 amDEN - PHL
1 stop6h 13mFrontier
Deal found 9/29$164
This CheapOair deal was found by Cheapflights users on 9/29. 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.
mié. 10/295:00 pmPHL - DEN
1 stop23h 53mFrontier
mar. 11/412:59 amDEN - PHL
1 stop12h 51mFrontier
Deal found 9/29$165
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
lun. 10/274:10 pmPHL - DEN
1 stop18h 53mFrontier
dom. 11/212:16 amDEN - PHL
1 stop23h 08mFrontier
Deal found 9/29$166
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
vie. 11/146:00 amPHL - DEN
1 stop29h 04mFrontier
dom. 11/1612:34 amDEN - PHL
1 stop20h 49mFrontier
Deal found 9/29$167
This Frontier deal was found by Cheapflights users on 9/29. 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.
mié. 10/2211:34 amPHL - DEN
1 stop13h 42mFrontier
jue. 10/231:42 pmDEN - PHL
1 stop9h 17mFrontier
Deal found 9/29$168
This Southwest deal was found by Cheapflights users on 9/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/257:15 amPHL - DEN
Nonstop4h 10mSouthwest
vie. 10/315:15 pmDEN - PHL
Nonstop3h 25mSouthwest
Deal found 9/30$169
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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.
vie. 10/246:42 amPHL - DEN
Nonstop4h 16mFrontier
mié. 10/2911:15 pmDEN - PHL
Nonstop3h 34mFrontier
Deal found 9/30$170
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
mar. 10/149:14 pmPHL - DEN
1 stop17h 30mFrontier
dom. 10/1911:59 pmDEN - PHL
1 stop10h 03mFrontier
Deal found 9/29$171
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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.
mar. 10/711:34 amPHL - DEN
1 stop13h 42mFrontier
dom. 10/1911:59 pmDEN - PHL
1 stop10h 03mFrontier
Deal found 9/28$172
This CheapOair deal was found by Cheapflights users on 9/29. 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.
sáb. 10/1111:00 amPHL - DEN
1 stop14h 16mFrontier
mar. 10/1411:59 pmDEN - PHL
1 stop8h 35mFrontier
Deal found 9/29$173
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
vie. 10/246:42 amPHL - DEN
Nonstop4h 16mFrontier
dom. 10/2611:45 pmDEN - PHL
Nonstop3h 34mFrontier
Deal found 9/29$174
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/63:07 pmPHL - DEN
1 stop10h 06mFrontier
mié. 10/86:01 amDEN - PHL
1 stop8h 40mFrontier
Deal found 9/27$175

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 septiembre 30, 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

mié. 12/3

6:35 am-8:45 am

Nonstop4h 10m

Denver Intl

mar. 12/9

8:00 am-5:15 pm

1 stop7h 15m

$208

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

lun. 10/27

5:00 am-7:10 am

Nonstop4h 10m

Denver Intl

lun. 11/3

5:15 pm-10:35 pm

Nonstop3h 20m

$237

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mié. 12/3

4:32 pm-11:04 pm

1 stop8h 32m

Denver Intl

lun. 12/8

11:59 pm-9:39 am

1 stop7h 40m

$245

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mar. 12/9

6:00 am-12:31 pm

1 stop8h 31m

Denver Intl

mar. 12/16

11:59 pm-9:39 am

1 stop7h 40m

$245

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

lun. 11/24

8:08 am-10:29 am

Nonstop4h 21m

Denver Intl

mié. 12/31

6:00 am-2:07 pm

1 stop6h 07m

$247

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

vie. 12/5

5:01 pm-12:17 am

1 stop9h 16m

Denver Intl

vie. 12/12

4:15 pm-11:57 pm

1 stop5h 42m

$257

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

dom. 12/7

6:00 am-10:18 am

1 stop6h 18m

Denver Intl

jue. 12/11

4:15 pm-11:57 pm

1 stop5h 42m

$257

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mié. 12/3

6:00 am-11:15 am

2 stops7h 15m

Denver Intl

sáb. 12/6

9:30 am-7:45 pm

2 stops8h 15m

$267

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

vie. 11/14

12:35 pm-6:25 pm

2 stops7h 50m

Denver Intl

mié. 11/19

8:15 am-5:35 pm

2 stops7h 20m

$287

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

lun. 11/24

7:35 pm-11:15 pm

1 stop5h 40m

Denver Intl

mié. 12/31

8:15 am-5:35 pm

2 stops7h 20m

$304

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/29

Showing 1-10 of 22 results
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Compare providers for flights from Philadelphia to Denver

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Denver in September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Philadelphia-Denver flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Denver flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-Denver flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Denver flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Denver flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 26, 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 septiembre 30, 2025.

It’s typically best to fly out from Philadelphia to Denver at noon. Doing so could potentially save you 38% 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 28, 2025.

Travelers seeking maximum savings on their Philadelphia to Denver flight should consider departing on Saturday 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 septiembre 30, 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
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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
7,964 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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
8,931 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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
3,155 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

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 9 flights from Philadelphia to Denver Intl, all of which are around 4h 05m 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.

  • How long is the flight from Philadelphia to Denver?

    Airlines like Southwest, JetBlue, and United Airlines fly from Philadelphia to Denver in about 4h 10m. The time it takes to get you to your destination can typically vary by up to 4h 22m. 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 $114 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 $767 for a flight from Philadelphia to Denver. The cheapest flight overall is $87 while the most popular route, (Philadelphia - Denver Intl) is currently priced at $157.

  • 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
Broomfield
Winter Park
Lakewood
Greeley
Lone Tree
Cripple Creek
Thornton
Silverthorne
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker
Sterling

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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.
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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 septiembre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$106Average$197FlexibilityNo cancel feeOn-time88%
FrontierCheapest$114Average$230FlexibilityNo cancel feeOn-time62%
DeltaCheapest$134Average$316FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$191Average$339FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$194Average$368FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$194Average$418FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$207Average$325FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$251Average$290FlexibilityNo cancel feeOn-time83%

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