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Cheap flights from Philadelphia to Denver (PHL - DEN) - Compare and Save

PHL — DEN
May 2 — May 91
Sat 5/2
Sat 5/9
1 adult, Economy
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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

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 April 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$155
(CheapOair)

One-way from

$85
(Super.com)

Popular in

March

Cheapest in

July

Average price

$313

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.
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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
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in April 2026
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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 April 2, 2026.

This CheapOair deal was found by Cheapflights users on 3/31. 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 6/28:30 am
PHL
-
DEN
1 stop7h 34m
Frontier
Tue 7/712:55 pm
DEN
-
PHL
1 stop24h 09m
Frontier
Deal found 3/31$155
This Cheapflightsfares deal was found by Cheapflights users on 3/31. 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 5/136:10 am
PHL
-
DEN
1 stop11h 55m
Frontier
Sat 5/1611:59 pm
DEN
-
PHL
1 stop23h 07m
Frontier
Deal found 3/31$156
This Frontier deal was found by Cheapflights users on 3/31. 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 4/281:30 pm
PHL
-
DEN
1 stop10h 04m
Frontier
Thu 4/3011:59 pm
DEN
-
PHL
1 stop11h 18m
Frontier
Deal found 3/31$157
This Frontier deal was found by Cheapflights users on 4/1. 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 5/128:35 pm
PHL
-
DEN
Nonstop4h 29m
Frontier
Sat 5/1611:59 pm
DEN
-
PHL
Nonstop3h 38m
Frontier
Deal found 4/1$158
This Cheapflightsfares deal was found by Cheapflights users on 3/31. 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 4/246:43 am
PHL
-
DEN
1 stop19h 36m
Frontier
Mon 4/2711:59 pm
DEN
-
PHL
1 stop11h 22m
Frontier
Deal found 3/31$159
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/205:05 am
PHL
-
DEN
1 stop8h 47m
Frontier
Thu 4/2311:05 pm
DEN
-
PHL
1 stop13h 23m
Frontier
Deal found 3/30$160
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1211:00 am
PHL
-
DEN
1 stop14h 08m
Frontier
Wed 4/2911:59 pm
DEN
-
PHL
Nonstop3h 35m
Frontier
Deal found 3/30$161
This Cheapflightsfares 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 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 3/30$162
This Cheapflightsfares 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 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
1 stop9h 33m
Frontier
Deal found 3/30$163
This Cheapflightsfares deal was found by Cheapflights users on 3/31. 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.
Sat 5/91:11 pm
PHL
-
DEN
1 stop12h 37m
Frontier
Sat 5/1611:59 pm
DEN
-
PHL
1 stop23h 07m
Frontier
Deal found 3/31$164
This Frontier deal was found by Cheapflights users on 3/31. 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 5/43:10 pm
PHL
-
DEN
1 stop8h 34m
Frontier
Sat 5/911:56 pm
DEN
-
PHL
1 stop6h 58m
Frontier
Deal found 3/31$165
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.
Sun 4/2610:38 pm
PHL
-
DEN
1 stop11h 33m
Frontier
Wed 4/2911:59 pm
DEN
-
PHL
Nonstop3h 35m
Frontier
Deal found 3/30$166

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 April 2, 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
Quickest round-trip

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Wed 5/6

5:50 am-7:55 am

Nonstop4h 05m

Denver Intl

Mon 5/11

7:05 pm-12:35 am

Nonstop3h 30m

$210

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 4/25

9:42 am-1:57 pm

1 stop6h 15m

Denver Intl

Sun 4/26

12:35 am-8:55 am

1 stop6h 20m

$241

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Mon 4/27

5:40 am-7:45 am

Nonstop4h 05m

Denver Intl

Sun 5/3

7:45 pm-1:15 am

Nonstop3h 30m

$259

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

Thu 4/23

2:15 pm-7:20 pm

2 stops7h 05m

Denver Intl

Wed 4/29

12:05 pm-10:00 pm

2 stops7h 55m

$330

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 5/1

11:10 am-6:35 pm

2 stops9h 25m

Denver Intl

Mon 5/4

7:00 am-4:45 pm

2 stops7h 45m

$349

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Fri 5/22

7:01 pm-11:41 pm

1 stop6h 40m

Denver Intl

Tue 5/26

5:45 am-4:12 pm

1 stop8h 27m

$365

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Sat 5/30

12:25 pm-7:00 pm

2 stops8h 35m

Denver Intl

Tue 6/2

8:40 am-4:50 pm

2 stops6h 10m

$375

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Mon 5/18

7:45 pm-12:44 am

1 stop6h 59m

Denver Intl

Fri 5/29

3:50 pm-11:44 pm

1 stop5h 54m

$465

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

Tue 4/14

8:00 am-10:20 am

Nonstop4h 20m

Denver Intl

Sat 4/18

5:59 pm-11:43 pm

Nonstop3h 44m

$477

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 24 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 April.
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
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 April 2, 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 $142). 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 April 2, 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 28, 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?

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 April 2, 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
4,337 reviews

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
4,337 reviews
Southwest
8.0
Very good
4,337 reviews

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
8,370 reviews
Southwest
8.0
Very good
4,337 reviews

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
9,533 reviews
Southwest
8.0
Very good
4,337 reviews

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
11,549 reviews
Southwest
8.0
Very good
4,337 reviews

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
3,004 reviews
Southwest
8.0
Very good
4,337 reviews

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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 6 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 4h 05m. The time it takes to get you to your destination can typically vary by up to 2h 10m. 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 $103, 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 $130.

  • 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 $142). 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 April 2, 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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