How often are flights from Philadelphia to Denver delayed?

About 16% of weekly flights between Philadelphia and Denver have experienced delays in the past year, with the average delay time being 163 minutes.

Which airline has the best punctuality record on Philadelphia to Denver flights?

Over the last year, United Airlines have had the lowest number of delays on this route, with just 10% of flights being delayed.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

What is the most punctual flight time for Philadelphia to Denver flights?

Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

How popular is this Philadelphia to Denver flight route?

The Philadelphia to Denver Intl flight path was viewed by 126 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

How long is the flight from Philadelphia to Denver?

Airlines like JetBlue, United Airlines, and Southwest fly from Philadelphia to Denver in about 4h 20m. The time it takes to get you to your destination can typically vary by up to 5h 47m. 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 $65 on Frontier. Other airlines that offer cheap prices include American Airlines from $87 and Southwest from $95 one-way.

Weekly flight availability from Philadelphia to Denver

The most flights from PHL to DEN are scheduled on a Monday (16 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (7 on average).

In terms of precipitation, rainfall in Denver ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Denver when rainfall is around 0.5 in.

If weather is an important factor for your trip to Denver, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

What are the cheapest flights from Philadelphia to Denver?

On average you can expect to pay $937 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 $134.

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 United Airlines (91%), Air Canada (89%) or Frontier (84%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Philadelphia to Denver?

Before booking your flight from Philadelphia to Denver check out the most popular airlines for this route: Frontier, American Airlines or United Airlines.

Most accurate provider : When it comes to deals on Philadelphia-Denver flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Philadelphia-Denver flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.

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 12 flights from Philadelphia to Denver Intl, all of which are around 3h 58m for a nonstop flight. You can also purchase a plane ticket from 8 airlines when you book a flight from Philadelphia to Denver.

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.

$101+ Flights from Philadelphia to Denver

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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

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Cheapflights Tip: The best prices from Philadelphia to Denver Intl are usually found in July or August, booked 40 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 diciembre 23, 2025.

mié. 12/3111:45 amPHL - DEN

1 stop28h 30mFrontier

lun. 1/511:59 pmDEN - PHL

1 stop12h 54mFrontier

Deal found 12/22

$182

mié. 12/3111:45 amPHL - DEN

1 stop28h 30mFrontier

mar. 1/611:24 amDEN - PHL

1 stop25h 51mFrontier

Deal found 12/22

$183

jue. 12/257:18 pmPHL - DEN

1 stop28h 31mFrontier

jue. 1/111:59 pmDEN - PHL

Nonstop3h 32mFrontier

Deal found 12/20

$195

mié. 12/3111:45 amPHL - DEN

1 stop28h 30mMultiple Airlines

mar. 1/66:00 amDEN - PHL

2 stops25h 07mMultiple Airlines

Deal found 12/22

$211

mié. 12/316:00 amPHL - DEN

1 stop6h 28mUnited Airlines

jue. 1/16:00 amDEN - PHL

1 stop6h 07mUnited Airlines

Deal found 12/21

$217

mié. 12/3111:45 amPHL - DEN

1 stop28h 30mFrontier

jue. 1/111:59 pmDEN - PHL

Nonstop3h 32mFrontier

Deal found 12/22

$222

jue. 12/257:18 pmPHL - DEN

1 stop28h 31mFrontier

mié. 12/317:00 amDEN - PHL

1 stop14h 43mFrontier

Deal found 12/22

$234

mié. 12/3111:45 amPHL - DEN

1 stop28h 30mFrontier

dom. 1/411:59 pmDEN - PHL

1 stop9h 45mFrontier

Deal found 12/22

$236

jue. 12/257:18 pmPHL - DEN

1 stop28h 31mFrontier

jue. 1/86:00 amDEN - PHL

1 stop9h 32mFrontier

Deal found 12/22

$241

Best flights from Philadelphia to Denver
Discover carefully curated flight deals from Philadelphia to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated diciembre 23, 2025.

sáb. 3/217:00 amPHL - DEN

1 stop10h 07mJetBlue

sáb. 3/2810:44 pmDEN - PHL

1 stop7h 05mJetBlue

Deal found 12/22

$221

mar. 1/2010:10 amPHL - DEN

1 stop6h 41mUnited Airlines

mar. 1/275:55 pmDEN - PHL

Nonstop3h 35mUnited Airlines

Deal found 12/23

$233

mié. 1/215:00 pmPHL - DEN

Nonstop4h 20mSouthwest

mié. 1/281:25 pmDEN - PHL

1 stop4h 55mSouthwest

Deal found 12/22

$259

mié. 3/116:00 amPHL - DEN

1 stop9h 51mJetBlue

lun. 3/1610:44 pmDEN - PHL

1 stop7h 05mJetBlue

Deal found 12/23

$249

mar. 1/201:10 pmPHL - DEN

1 stop6h 47mUnited Airlines

jue. 1/225:55 pmDEN - PHL

Nonstop3h 37mUnited Airlines

Deal found 12/22

$301

mié. 5/203:15 pmPHL - DEN

1 stop8h 24mJetBlue

lun. 5/2510:34 pmDEN - PHL

1 stop8h 39mJetBlue

Deal found 12/22

$277

mié. 2/45:00 pmPHL - DEN

Nonstop4h 20mSouthwest

jue. 2/54:50 pmDEN - PHL

Nonstop3h 25mSouthwest

Deal found 12/23

$317

sáb. 1/313:43 pmPHL - DEN

Nonstop4h 29mUnited Airlines

jue. 2/510:15 amDEN - PHL

Nonstop3h 35mUnited Airlines

Deal found 12/22

$317

jue. 5/283:15 pmPHL - DEN

1 stop8h 24mJetBlue

dom. 5/3110:34 pmDEN - PHL

1 stop8h 39mJetBlue

Deal found 12/21

$308

jue. 1/228:09 amPHL - DEN

Nonstop4h 26mUnited Airlines

mar. 1/2710:15 amDEN - PHL

Nonstop3h 35mUnited Airlines

Deal found 12/22

$317

lun. 2/233:37 pmPHL - DEN

Nonstop4h 30mUnited Airlines

mié. 2/2510:15 amDEN - PHL

Nonstop3h 36mUnited Airlines

Deal found 12/21

$317

Last-minute flights from Philadelphia to Denver
Discover last-minute flight deals from Philadelphia to Denver. Data last updated diciembre 23, 2025 and is based on user searches.

sáb. 1/105:05 amPHL - DEN

1 stop17h 15mFrontier

mar. 1/1312:05 amDEN - PHL

1 stop9h 09mFrontier

Deal found 12/21

$151

sáb. 1/105:05 amPHL - DEN

1 stop17h 15mMultiple Airlines

mié. 1/141:53 pmDEN - PHL

2 stops16h 54mMultiple Airlines

Deal found 12/21

$152

lun. 1/129:52 amPHL - DEN

1 stop28h 07mMultiple Airlines

vie. 1/1612:05 amDEN - PHL

1 stop8h 41mMultiple Airlines

Deal found 12/21

$148

mar. 1/135:30 amPHL - DEN

1 stop8h 51mFrontier

mié. 1/217:30 amDEN - PHL

1 stop15h 22mFrontier

Deal found 12/22

$146

mar. 1/131:40 pmPHL - DEN

2 stops24h 38mMultiple Airlines

mié. 1/217:30 amDEN - PHL

1 stop15h 22mMultiple Airlines

Deal found 12/22

$154

lun. 1/197:12 pmPHL - DEN

1 stop19h 07mFrontier

lun. 1/266:00 amDEN - PHL

1 stop27h 14mFrontier

Deal found 12/22

$158

mar. 1/201:40 pmPHL - DEN

2 stops24h 37mMultiple Airlines

sáb. 1/316:00 amDEN - PHL

1 stop11h 13mMultiple Airlines

Deal found 12/21

$145

mar. 1/206:00 amPHL - DEN

1 stop8h 19mFrontier

sáb. 1/241:20 pmDEN - PHL

1 stop7h 26mFrontier

Deal found 12/21

$147

mar. 1/276:00 amPHL - DEN

1 stop8h 19mFrontier

lun. 2/210:46 amDEN - PHL

1 stop27h 31mFrontier

Deal found 12/22

$144

mar. 1/276:00 amPHL - DEN

1 stop8h 19mMultiple Airlines

lun. 2/29:05 pmDEN - PHL

2 stops36h 14mMultiple Airlines

Deal found 12/22

$155

mar. 1/276:00 amPHL - DEN

1 stop8h 19mFrontier

dom. 2/16:08 pmDEN - PHL

1 stop17h 37mFrontier

Deal found 12/22

$156

mié. 1/286:00 amPHL - DEN

1 stop8h 19mFrontier

mié. 3/411:59 pmDEN - PHL

1 stop29h 37mFrontier

Deal found 12/22

$149

One-way flights from Philadelphia to Denver
Search for one-way flight options from Philadelphia to Denver. Find affordable one-way fares based on user searches. Data last updated diciembre 23, 2025.

sáb. 1/244:27 pmPHL - DEN

2 stops17h 52mMultiple Airlines

Deal found 12/23

$101

jue. 2/56:00 amPHL - DEN

2 stops17h 49mFrontier

Deal found 12/23

$102

dom. 1/115:40 pmPHL - DEN

2 stops24h 50mMultiple Airlines

Deal found 12/23

$103

vie. 2/278:27 pmPHL - DEN

2 stops18h 10mMultiple Airlines

Deal found 12/23

$104

sáb. 1/176:11 pmPHL - DEN

2 stops23h 10mMultiple Airlines

Deal found 12/23

$105

dom. 2/810:45 pmPHL - DEN

2 stops37h 37mFrontier

Deal found 12/21

$106

dom. 1/186:45 amPHL - DEN

1 stop16h 54mFrontier

Deal found 12/23

$107

lun. 3/25:47 pmPHL - DEN

Nonstop4h 30mFrontier

Deal found 12/23

$108

jue. 1/16:35 amPHL - DEN

1 stop8h 19mUnited Airlines

Deal found 12/22

$109

jue. 3/51:02 pmPHL - DEN

1 stop8h 09mFrontier

Deal found 12/23

$110

dom. 3/296:00 amPHL - DEN

1 stop8h 22mJetBlue

Deal found 12/22

$111

jue. 2/268:59 pmPHL - DEN

2 stops39h 23mFrontier

Deal found 12/22

$112

Find flight deals from Philadelphia to Denver

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$144 (Kiwi.com)
One-way from	$101 (Kiwi.com)
Popular in	December
Cheapest in	July
Average price	$391
Good round-trip deal	$287 or less
Good one-way deal	$185 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. 6% potential increase in price ($20 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 December 2025

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

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

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

sáb. 3/21

7:00 am-3:07 pm

1 stop10h 07m

Denver Intl

sáb. 3/28

10:44 pm-7:49 am

1 stop7h 05m

$221

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mar. 1/20

10:10 am-2:51 pm

1 stop6h 41m

Denver Intl

mar. 1/27

5:55 pm-11:30 pm

Nonstop3h 35m

$233

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mié. 3/11

6:00 am-1:51 pm

1 stop9h 51m

Denver Intl

lun. 3/16

10:44 pm-7:49 am

1 stop7h 05m

$249

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mié. 1/21

5:00 pm-7:20 pm

Nonstop4h 20m

Denver Intl

mié. 1/28

1:25 pm-8:20 pm

1 stop4h 55m

$259

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mié. 5/20

3:15 pm-9:39 pm

1 stop8h 24m

Denver Intl

lun. 5/25

10:34 pm-9:13 am

1 stop8h 39m

$277

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mar. 1/20

1:10 pm-5:57 pm

1 stop6h 47m

Denver Intl

jue. 1/22

5:55 pm-11:32 pm

Nonstop3h 37m

$301

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

jue. 5/28

3:15 pm-9:39 pm

1 stop8h 24m

Denver Intl

dom. 5/31

10:34 pm-9:13 am

1 stop8h 39m

$308

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

mié. 2/4

5:00 pm-7:20 pm

Nonstop4h 20m

Denver Intl

jue. 2/5

4:50 pm-10:15 pm

Nonstop3h 25m

$317

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

sáb. 1/31

3:43 pm-6:12 pm

Nonstop4h 29m

Denver Intl

jue. 2/5

10:15 am-3:50 pm

Nonstop3h 35m

$317

PhiladelphiaDenver

PHL - DEN

PHLDEN

Philadelphia

jue. 1/22

8:09 am-10:35 am

Nonstop4h 26m

Denver Intl

mar. 1/27

10:15 am-3:50 pm

Nonstop3h 35m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

Showing 1-10 of 21 results

Compare providers for flights from Philadelphia to Denver

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Denver in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Kiwi.com	Price Accuracy3 stars	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*1 star
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
CheapTicketsDeal	Price Accuracy3 stars	Trust Score*3 stars
Trip.com	Price Accuracy2 stars	Trust 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Philadelphia-Denver flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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

Prices

Airlines

Delays

How far ahead should I book a flight from Philadelphia to Denver?

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 $88). Flying from Philadelphia to Denver in May is currently the most expensive (average of $143). 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?

It’s typically best to fly out from Philadelphia to Denver at noon. Doing so could potentially save you 36% 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?

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.

The best insider tips for Philadelphia to Denver flights

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.

DEN

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

Our travel experts

Mark Chesnut

Expert on PHL

Emily Zemler

Expert on DEN

Reviews of airlines servicing Denver

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

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Southwest

8.0

Very good

4,253 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Delta

7.9

Good

8,014 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

United Airlines

7.4

Good

9,105 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

American Airlines

7.2

Good

11,054 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Frontier

5.8

Fair

3,075 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

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 12 flights from Philadelphia to Denver Intl, all of which are around 3h 58m for a nonstop flight. You can also purchase a plane ticket from 8 airlines when you book a flight from Philadelphia to Denver.
How popular is this Philadelphia to Denver flight route?
The Philadelphia to Denver Intl flight path was viewed by 126 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
How long is the flight from Philadelphia to Denver?
Airlines like JetBlue, United Airlines, and Southwest fly from Philadelphia to Denver in about 4h 20m. The time it takes to get you to your destination can typically vary by up to 5h 47m. 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 $65 on Frontier. Other airlines that offer cheap prices include American Airlines from $87 and Southwest from $95 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 United Airlines (91%), Air Canada (89%) or Frontier (84%) 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 $937 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 $134.
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 $88). Flying from Philadelphia to Denver in May is currently the most expensive (average of $143). 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

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Top 8 airlines flying from Philadelphia to Denver

Airline	Cheapest	Average	Flexibility	On-time
Allegiant Air	Cheapest$106	Average$194	FlexibilityNo cancel fee	On-time88%
Frontier	Cheapest$117	Average$227	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$134	Average$296	FlexibilityNo cancel fee	On-timeN/A
Sun Country Air	Cheapest$177	Average$275	FlexibilityNo cancel fee	On-time83%
United Airlines	Cheapest$191	Average$407	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$198	Average$346	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$201	Average$369	FlexibilityNo cancel fee	On-time71%
JetBlue	Cheapest$207	Average$293	FlexibilityNo cancel fee	On-time62%

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$101+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Philadelphia to Denver Intl are usually found in July or August, booked 40 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 DenverExplore 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 diciembre 23, 2025.

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 diciembre 23, 2025.

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Reviews of airlines servicing Denver

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.

Related info for your journey

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Top 8 airlines flying from Philadelphia to Denver

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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 diciembre 23, 2025.