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$89+ 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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — DEN
Apr 29 — May 61
Wed 4/29
Wed 5/6
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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Philadelphia to Denver Intl are usually found in July or August, booked 32 days in advance, depart on a Friday or Thursday and return on a Thursday

Cheap 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 March 30, 2026.

This Frontier deal was found by Cheapflights users on 3/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:41 pm
PHL
-
DEN
Nonstop4h 28m
Frontier
Mon 4/2011:59 pm
DEN
-
PHL
Nonstop3h 35m
Frontier
Deal found 3/30$160
This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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.
Fri 5/18:41 pm
PHL
-
DEN
Nonstop4h 28m
Frontier
Sun 5/311:59 pm
DEN
-
PHL
Nonstop3h 35m
Frontier
Deal found 3/27$162
This Frontier deal was found by Cheapflights users on 3/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/169:20 am
PHL
-
DEN
1 stop7h 12m
Frontier
Sun 5/176:03 am
DEN
-
PHL
1 stop10h 37m
Frontier
Deal found 3/30$165
This Frontier deal was found by Cheapflights users on 3/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/266:54 pm
PHL
-
DEN
1 stop7h 05m
Frontier
Mon 4/2711:59 pm
DEN
-
PHL
Nonstop3h 35m
Frontier
Deal found 3/28$166
This Cheapflightsfares deal was found by Cheapflights users on 3/29. 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.
Fri 4/178:36 pm
PHL
-
DEN
Nonstop4h 28m
Frontier
Fri 4/2411:59 pm
DEN
-
PHL
Nonstop3h 35m
Frontier
Deal found 3/29$167
This CheapOair deal was found by Cheapflights users on 3/27. 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.
Fri 4/1710:38 pm
PHL
-
DEN
1 stop26h 21m
Frontier
Tue 4/213:32 pm
DEN
-
PHL
1 stop17h 06m
Frontier
Deal found 3/27$168
This Cheapflightsfares deal was found by Cheapflights users on 3/29. 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.
Thu 5/149:16 pm
PHL
-
DEN
1 stop13h 08m
Frontier
Sun 5/176:03 am
DEN
-
PHL
1 stop10h 37m
Frontier
Deal found 3/29$169
This Frontier deal was found by Cheapflights users on 3/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/115:06 pm
PHL
-
DEN
1 stop8h 46m
Frontier
Mon 5/1811:59 pm
DEN
-
PHL
1 stop11h 51m
Frontier
Deal found 3/27$170
This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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.
Wed 5/202:45 pm
PHL
-
DEN
1 stop9h 54m
Frontier
Sun 5/246:03 am
DEN
-
PHL
1 stop10h 37m
Frontier
Deal found 3/27$171
This Frontier deal was found by Cheapflights users on 3/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/124:35 pm
PHL
-
DEN
1 stop7h 49m
Frontier
Sat 5/166:30 am
DEN
-
PHL
1 stop8h 45m
Frontier
Deal found 3/30$172

Find 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 March 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(Frontier)

One-way from

$89
(Trip.com)

Popular in

March

Cheapest in

July

Average price

$384

Good round-trip deal

$292 or less

Good one-way deal

$177 or less
Provider with most accurate pricing for Philadelphia-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Denver Intl flights.
Search Deals
From Philadelphia to Denver Intl
Search Deals
One-way flight from Philadelphia to Denver Intl
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Philadelphia to Denver Intl.
Search Deals
Price to beat on a one-way flight from Philadelphia to Denver Intl.
Search Deals

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 March 30, 2026.
Use the filters below to find and compare flights from Philadelphia to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Thu 5/7

6:35 pm-11:45 pm

1 stop7h 10m

Denver Intl

Mon 5/11

7:00 am-4:45 pm

2 stops7h 45m

$246

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 5/9

5:45 am-12:12 pm

1 stop8h 27m

Denver Intl

Sun 5/10

6:19 pm-6:10 am

1 stop9h 51m

$279

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 5/8

7:01 pm-11:41 pm

1 stop6h 40m

Denver Intl

Mon 5/11

3:12 pm-11:07 pm

1 stop5h 55m

$279
Quickest round-trip

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Thu 4/30

5:40 am-7:45 am

Nonstop4h 05m

Denver Intl

Sun 5/3

7:45 pm-1:15 am

Nonstop3h 30m

$317

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Mon 4/27

2:15 pm-7:20 pm

2 stops7h 05m

Denver Intl

Thu 4/30

7:00 am-4:45 pm

2 stops7h 45m

$341

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Tue 4/28

11:35 am-5:20 pm

2 stops7h 45m

Denver Intl

Fri 5/1

1:25 pm-11:45 pm

2 stops8h 20m

$349

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 4/22

9:10 am-4:20 pm

2 stops9h 10m

Denver Intl

Mon 4/27

1:25 pm-11:45 pm

2 stops8h 20m

$355

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 4/17

4:30 pm-11:00 pm

2 stops8h 30m

Denver Intl

Wed 4/22

6:50 am-4:50 pm

2 stops8h 00m

$355

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 4/22

11:35 am-5:20 pm

2 stops7h 45m

Denver Intl

Sun 4/26

10:25 am-11:55 pm

2 stops11h 30m

$355

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 5/23

7:00 pm-12:33 am

1 stop7h 33m

Denver Intl

Sat 5/30

4:41 pm-12:57 am

1 stop6h 16m

$365

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Super.comPrice Accuracy-Trust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 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.

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 March 13, 2026.

Booking 32 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, January is the cheapest month in which you can book a flight from Philadelphia to Denver (average of $85). Flying from Philadelphia to Denver in June is currently the most expensive (average of $141). 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 March 30, 2026.

It’s typically best to fly out from Philadelphia to Denver at noon. Doing so could potentially save you 34% 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 March 23, 2026.

Travelers seeking maximum savings on their Philadelphia to Denver flight should consider departing on Friday at noon 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.

How much does it cost to fly round-trip from Philadelphia to Denver?

The best insider tips for Philadelphia to Denver flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to Denver trip
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

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 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

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 March 30, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited 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
4,329 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,329 reviews
Southwest
8.0
Very good
4,329 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,358 reviews
Southwest
8.0
Very good
4,329 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,514 reviews
Southwest
8.0
Very good
4,329 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,530 reviews
Southwest
8.0
Very good
4,329 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
3,010 reviews
Southwest
8.0
Very good
4,329 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 7 flights from Philadelphia to Denver Intl, all of which are around 3h 50m for a nonstop flight. You can also purchase a plane ticket from 7 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 149 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 and Delta fly from Philadelphia to Denver in about 7h 10m. The time it takes to get you to your destination can typically vary by up to 1h 17m. 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 $102, 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 Allegiant Air and Delta - these airlines can fly you to your destination from $106 and $128, respectively. Frontier is priced at 67% 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 $64 on Frontier. Other airlines that offer cheap prices include JetBlue from $79 and American Airlines from $93 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 Qatar Airways (86%), American Airlines (81%) or Air Canada (79%) 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 $754 for a flight from Philadelphia to Denver. The cheapest flight overall is $98 while the most popular route, (Philadelphia - Denver Intl) is currently priced at $148.

  • 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, January is the cheapest month in which you can book a flight from Philadelphia to Denver (average of $85). Flying from Philadelphia to Denver in June is currently the most expensive (average of $141). 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
Thornton
Black Hawk
Lakewood
Westminster
Broomfield
Golden
Centennial
Greeley
Lone Tree
Wheat Ridge
Silverthorne
Central City
Cripple Creek
Winter Park
Manitou Springs
Frisco
Englewood
Fort Morgan
Glendale
Brighton

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from Philadelphia to Denver

Discover the top 7 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 March 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$103Average$216FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$106Average$194FlexibilityNo cancel feeOn-time88%
DeltaCheapest$128Average$264FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$189Average$392FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$198Average$345FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$206Average$370FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$220Average$293FlexibilityNo cancel feeOn-time62%

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