Find Cheap Flights from Philadelphia to Denver International (PHL - DEN)

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Fri 11/24
Fri 12/1
Any month
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Good to Know

Low Season:
January
Best time to beat the crowds
2%
expected price decrease
High Season:
July
Most popular time to fly
14%
expected price increase
Average Price:
$410
(avg. price over the last 2 weeks)
Good Deal:
$410
or less (round trip)

When to Book Flights from Philadelphia to Denver International

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

The cheapest flight from Philadelphia to Denver International was found 33 days before departure, on average.
Book at least 2 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is January.
Morning departure is around 26% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Philadelphia to Denver International Flights

How long does a flight from Philadelphia to Denver International take?
An average nonstop flight takes 4h 08m, covering a distance of 1554 miles.
How many flights are there between Philadelphia and Denver International?
There are 158 (nonstop) flights between Philadelphia and Denver International per week, averaging 23 per day.
Which airlines provide the cheapest flights from Philadelphia to Denver International?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($87), Multiple Airlines ($91) and American Airlines ($171).
Do I need a passport to fly between Philadelphia and Denver International?
No.
Which airlines fly most frequently between Philadelphia and Denver International?
American Airlines (6 times daily), British Airways (5 times daily), Southwest (4 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Philadelphia to Denver International?
For Philadelphia to Denver International, Sunday is the cheapest day to fly on average and Friday is the most expensive. Flying from Denver International back to Philadelphia, the best deals are generally found on Friday, with Sunday being the most expensive.

Book cheap flights from Philadelphia to Denver International (round-trip)

Airports
Origin
Philadelphia
$87
only
$87
Destination
Denver
$87
only
$87
Sun, Dec 3
PHL
DEN
4h 13m
Wed, Dec 6
DEN
PHL
3h 32m
Trip: 4 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Mediocre 3.3

Cheap

Not cheap after you pay for everything they hide.

PHL
DEN
Excellent 10.0

The only thing I didn't care for was that when my flight was delayed by three hours; when I landed the crew in the airport because an attendant refused to take minute to look at my ticket. If she had looked at my ticket she would have seen that I didn't miss my connecting flight because it was also delayed by three hours. I almost missed my connecting flight because this artentand kept refusing to help me and kept sending me to customer service who would have told me to get on my same connecting flight. The attendant was working at the desk near my connecting flight but refused to take a minute to try to help me even though she wasn't busy nor was she helping someone. I had to figure this out on my own while standing in line at customer service, which had about 100 people waiting who also missed their flight so I would have missed my flight if I had done what the frontier attendant from my connecting flight desk had instructed me to do. I had to run back to the gate minutes before boarding ended almost missing my connecting flight because of the attendant. Attendant worked at the denver , co airport. The crew on the plane and everyone else was great. Also didn't care for the charge for a carry on bag.

PHL
DEN
Okay 4.3

Staff was very nice

Very uncomfortable plane to fly in. Wouldn't have paid extra to choose a seat if I realized they were all hard and didn't recline

PHL
DEN
Mediocre 3.0

the seats don't recline. there is no inflight entertainment. they additionally charge for seats and to carry on a bag.

PHL
DEN
Mediocre 2.0

Frontier changed our flights and didn't notify us and left us high and dry in Philly yesterday!! Thank God for my sister and travel insurance otherwise I would have lost my mind.

They took our money, a lot of money and then stranded us in Philly, then gave us the gift of a 13 hour layover in Denver. Frontier is the WORST AIRLINE on the ENTIRE PLANET!!

Sun, Jan 14
PHL
DEN
4h 40m
Wed, Jan 17
DEN
PHL
3h 28m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Mar 6
PHL
DEN
4h 08m
Wed, Mar 14
DEN
PHL
3h 31m
Trip: 8 days
6.9GoodShow reviews
Overall 6.9 Good
Based on 30 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PHL
DEN
Mediocre 3.6

Flight was delayed and then extended by 2 hours due to weather.

PHL
DEN
Good 7.0

I fly this route with American pretty often. The cabin crew was good. Everything else seemed sub par.

Our take off was delayed, officially due to fueling the plane, but if the plane wasn't fueled ahead of time, someone failed to do their job properly. Also, while I'm starting to think that A320s just suck mechanically for landing (they always seem to land harder than a 737), this one seemed a little extra rough.

PHL
DEN
Good 6.6

Staff was great!

Seats were really uncomfortable up and reclined. Overhead baggage was full by the time I boarded and there was no enforcement of the carry-on baggage sizes... This needs to be addressed and contributed to our lack of comfort, noting this was the last leg of an 18 hour journey. My body still hurts today after a good nights sleep.

PHL
DEN
Excellent 10.0

American Airlines is my favorite Airlines to fly. There is a little more leg room and the seats are a little wider. The staff is very professional and courteous.

PHL
DEN
Okay 5.3

Crew was really understanding of the frustration and were helpful. Plane was clean and newer.

Delayed due to weather... it happens. Just frustrating being delayed on the last flight of the day.

Sat, Jan 13
PHL
DEN
4h 40m
Thu, Jan 18
DEN
PHL
3h 34m
Trip: 6 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Mediocre 2.0

Nothing

Everything

PHL
DEN
Excellent 10.0

Hassle free check in a nd security check in, flight left on time arrived early.

Waiting a little while to get to turminal.

PHL
DEN
Good 6.0

Easy boarding and attendants we're very nice.

Cramped and uncomfortable seating.

PHL
DEN
Excellent 8.0

Seating

PHL
DEN
Mediocre 3.3

Cheap

Not cheap after you pay for everything they hide.

Wed, Jan 17
PHL
DEN
4h 22m
Wed, Jan 24
DEN
PHL
3h 34m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Dec 5
PHL
DEN
4h 13m
Sat, Dec 9
DEN
PHL
3h 29m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Feb 4
PHL
DEN
4h 40m
Tue, Feb 6
DEN
PHL
3h 34m
Trip: 3 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Excellent 10.0

The only thing I didn't care for was that when my flight was delayed by three hours; when I landed the crew in the airport because an attendant refused to take minute to look at my ticket. If she had looked at my ticket she would have seen that I didn't miss my connecting flight because it was also delayed by three hours. I almost missed my connecting flight because this artentand kept refusing to help me and kept sending me to customer service who would have told me to get on my same connecting flight. The attendant was working at the desk near my connecting flight but refused to take a minute to try to help me even though she wasn't busy nor was she helping someone. I had to figure this out on my own while standing in line at customer service, which had about 100 people waiting who also missed their flight so I would have missed my flight if I had done what the frontier attendant from my connecting flight desk had instructed me to do. I had to run back to the gate minutes before boarding ended almost missing my connecting flight because of the attendant. Attendant worked at the denver , co airport. The crew on the plane and everyone else was great. Also didn't care for the charge for a carry on bag.

PHL
DEN
Mediocre 2.0

Nothing

Everything

PHL
DEN
Mediocre 2.0

Frontier changed our flights and didn't notify us and left us high and dry in Philly yesterday!! Thank God for my sister and travel insurance otherwise I would have lost my mind.

They took our money, a lot of money and then stranded us in Philly, then gave us the gift of a 13 hour layover in Denver. Frontier is the WORST AIRLINE on the ENTIRE PLANET!!

PHL
DEN
Okay 4.3

Staff was very nice

Very uncomfortable plane to fly in. Wouldn't have paid extra to choose a seat if I realized they were all hard and didn't recline

PHL
DEN
Excellent 10.0

Hassle free check in a nd security check in, flight left on time arrived early.

Waiting a little while to get to turminal.

Tue, Feb 6
PHL
DEN
4h 40m
Tue, Feb 13
DEN
PHL
3h 34m
Trip: 8 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Excellent 8.0

Seating

PHL
DEN
Mediocre 3.3

Cheap

Not cheap after you pay for everything they hide.

PHL
DEN
Good 6.0

Easy boarding and attendants we're very nice.

Cramped and uncomfortable seating.

PHL
DEN
Excellent 10.0

Hassle free check in a nd security check in, flight left on time arrived early.

Waiting a little while to get to turminal.

PHL
DEN
Excellent 10.0

The only thing I didn't care for was that when my flight was delayed by three hours; when I landed the crew in the airport because an attendant refused to take minute to look at my ticket. If she had looked at my ticket she would have seen that I didn't miss my connecting flight because it was also delayed by three hours. I almost missed my connecting flight because this artentand kept refusing to help me and kept sending me to customer service who would have told me to get on my same connecting flight. The attendant was working at the desk near my connecting flight but refused to take a minute to try to help me even though she wasn't busy nor was she helping someone. I had to figure this out on my own while standing in line at customer service, which had about 100 people waiting who also missed their flight so I would have missed my flight if I had done what the frontier attendant from my connecting flight desk had instructed me to do. I had to run back to the gate minutes before boarding ended almost missing my connecting flight because of the attendant. Attendant worked at the denver , co airport. The crew on the plane and everyone else was great. Also didn't care for the charge for a carry on bag.

Sat, Feb 3
PHL
DEN
4h 22m
Tue, Feb 6
DEN
PHL
3h 34m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Mar 6
PHL
DEN
4h 08m
Wed, Mar 14
DEN
PHL
13h 34m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Jan 26
PHL
DEN
4h 40m
Tue, Jan 30
DEN
PHL
3h 34m
Trip: 5 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Mediocre 3.6

My seat broke and the flight attendant said there was nothing they could do. Ten minutes later a woman asked to move her seat for more comfort and he allowed it. I slid out of my seat the whole flight.

PHL
DEN
Mediocre 2.0

Frontier changed our flights and didn't notify us and left us high and dry in Philly yesterday!! Thank God for my sister and travel insurance otherwise I would have lost my mind.

They took our money, a lot of money and then stranded us in Philly, then gave us the gift of a 13 hour layover in Denver. Frontier is the WORST AIRLINE on the ENTIRE PLANET!!

PHL
DEN
Mediocre 3.0

the seats don't recline. there is no inflight entertainment. they additionally charge for seats and to carry on a bag.

PHL
DEN
Excellent 10.0

The only thing I didn't care for was that when my flight was delayed by three hours; when I landed the crew in the airport because an attendant refused to take minute to look at my ticket. If she had looked at my ticket she would have seen that I didn't miss my connecting flight because it was also delayed by three hours. I almost missed my connecting flight because this artentand kept refusing to help me and kept sending me to customer service who would have told me to get on my same connecting flight. The attendant was working at the desk near my connecting flight but refused to take a minute to try to help me even though she wasn't busy nor was she helping someone. I had to figure this out on my own while standing in line at customer service, which had about 100 people waiting who also missed their flight so I would have missed my flight if I had done what the frontier attendant from my connecting flight desk had instructed me to do. I had to run back to the gate minutes before boarding ended almost missing my connecting flight because of the attendant. Attendant worked at the denver , co airport. The crew on the plane and everyone else was great. Also didn't care for the charge for a carry on bag.

PHL
DEN
Good 7.3

It was on time

Tue, Mar 6
PHL
DEN
4h 22m
Tue, Mar 13
DEN
PHL
7h 42m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Apr 10
PHL
DEN
4h 26m
Tue, Apr 17
DEN
PHL
3h 34m
Trip: 8 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Mediocre 2.0

Nothing

Everything

PHL
DEN
Excellent 10.0

The only thing I didn't care for was that when my flight was delayed by three hours; when I landed the crew in the airport because an attendant refused to take minute to look at my ticket. If she had looked at my ticket she would have seen that I didn't miss my connecting flight because it was also delayed by three hours. I almost missed my connecting flight because this artentand kept refusing to help me and kept sending me to customer service who would have told me to get on my same connecting flight. The attendant was working at the desk near my connecting flight but refused to take a minute to try to help me even though she wasn't busy nor was she helping someone. I had to figure this out on my own while standing in line at customer service, which had about 100 people waiting who also missed their flight so I would have missed my flight if I had done what the frontier attendant from my connecting flight desk had instructed me to do. I had to run back to the gate minutes before boarding ended almost missing my connecting flight because of the attendant. Attendant worked at the denver , co airport. The crew on the plane and everyone else was great. Also didn't care for the charge for a carry on bag.

PHL
DEN
Mediocre 3.6

My seat broke and the flight attendant said there was nothing they could do. Ten minutes later a woman asked to move her seat for more comfort and he allowed it. I slid out of my seat the whole flight.

PHL
DEN
Mediocre 2.0

Not much...

Everything was extra.

PHL
DEN
Okay 4.3

Staff was very nice

Very uncomfortable plane to fly in. Wouldn't have paid extra to choose a seat if I realized they were all hard and didn't recline

Wed, Apr 18
PHL
DEN
4h 26m
Tue, May 1
DEN
PHL
3h 32m
Trip: 14 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Mediocre 2.0

Not much...

Everything was extra.

PHL
DEN
Mediocre 3.3

Cheap

Not cheap after you pay for everything they hide.

PHL
DEN
Okay 4.3

Staff was very nice

Very uncomfortable plane to fly in. Wouldn't have paid extra to choose a seat if I realized they were all hard and didn't recline

PHL
DEN
Good 7.3

It was on time

PHL
DEN
Mediocre 2.0

Frontier changed our flights and didn't notify us and left us high and dry in Philly yesterday!! Thank God for my sister and travel insurance otherwise I would have lost my mind.

They took our money, a lot of money and then stranded us in Philly, then gave us the gift of a 13 hour layover in Denver. Frontier is the WORST AIRLINE on the ENTIRE PLANET!!

Tue, May 1
PHL
DEN
4h 23m
Tue, May 8
DEN
PHL
3h 32m
Trip: 8 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Excellent 10.0

Hassle free check in a nd security check in, flight left on time arrived early.

Waiting a little while to get to turminal.

PHL
DEN
Mediocre 2.0

Not much...

Everything was extra.

PHL
DEN
Excellent 8.0

Seating

PHL
DEN
Mediocre 3.6

My seat broke and the flight attendant said there was nothing they could do. Ten minutes later a woman asked to move her seat for more comfort and he allowed it. I slid out of my seat the whole flight.

PHL
DEN
Okay 4.3

Staff was very nice

Very uncomfortable plane to fly in. Wouldn't have paid extra to choose a seat if I realized they were all hard and didn't recline

Wed, May 9
PHL
DEN
4h 23m
Sat, May 12
DEN
PHL
5h 10m
Trip: 4 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Okay 4.3

Staff was very nice

Very uncomfortable plane to fly in. Wouldn't have paid extra to choose a seat if I realized they were all hard and didn't recline

PHL
DEN
Good 6.0

Easy boarding and attendants we're very nice.

Cramped and uncomfortable seating.

PHL
DEN
Mediocre 3.6

My seat broke and the flight attendant said there was nothing they could do. Ten minutes later a woman asked to move her seat for more comfort and he allowed it. I slid out of my seat the whole flight.

PHL
DEN
Mediocre 3.3

Cheap

Not cheap after you pay for everything they hide.

PHL
DEN
Mediocre 3.0

the seats don't recline. there is no inflight entertainment. they additionally charge for seats and to carry on a bag.

Fri, Nov 24
PHL
DEN
6h 29m
Mon, Nov 27
DEN
PHL
5h 58m
Trip: 4 days
6.9GoodShow reviews
Overall 6.9 Good
Based on 30 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PHL
DEN
Excellent 10.0

American Airlines is my favorite Airlines to fly. There is a little more leg room and the seats are a little wider. The staff is very professional and courteous.

PHL
DEN
Good 6.6

Staff was great!

Seats were really uncomfortable up and reclined. Overhead baggage was full by the time I boarded and there was no enforcement of the carry-on baggage sizes... This needs to be addressed and contributed to our lack of comfort, noting this was the last leg of an 18 hour journey. My body still hurts today after a good nights sleep.

PHL
DEN
Mediocre 3.6

Flight was delayed and then extended by 2 hours due to weather.

PHL
DEN
Okay 5.3

Crew was really understanding of the frustration and were helpful. Plane was clean and newer.

Delayed due to weather... it happens. Just frustrating being delayed on the last flight of the day.

PHL
DEN
Mediocre 3.3

Crew

Had to board three times, two different planes. I understand mechanical problems, but 3 hours later, and on another plane, the captain starts making stuff up, saying that the only reason we hadn't moved in the last hour was because people were using the bathroom, then something about having to deplane because the plane couldn't back up with us on it because of some sensor? And then, surprise ! All of the sudden they noticed there was an issue with his and some of the crews' hours and we had to wait till they could locate more crew. But they gave us each a 1/3 glass of water and later a $12 food voucher which didn't even cover a meal and beverage. Whoop-de-do. 7 hours later we finally boarded for the third and last time. The crew on the other hand stayed professional and friendly.

Wed, Dec 20
PHL
DEN
4h 40m
Mon, Dec 25
DEN
PHL
3h 39m
Trip: 6 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Mediocre 2.0

Not much...

Everything was extra.

PHL
DEN
Okay 4.3

Staff was very nice

Very uncomfortable plane to fly in. Wouldn't have paid extra to choose a seat if I realized they were all hard and didn't recline

PHL
DEN
Mediocre 2.0

Frontier changed our flights and didn't notify us and left us high and dry in Philly yesterday!! Thank God for my sister and travel insurance otherwise I would have lost my mind.

They took our money, a lot of money and then stranded us in Philly, then gave us the gift of a 13 hour layover in Denver. Frontier is the WORST AIRLINE on the ENTIRE PLANET!!

PHL
DEN
Mediocre 3.3

Cheap

Not cheap after you pay for everything they hide.

PHL
DEN
Good 6.0

Easy boarding and attendants we're very nice.

Cramped and uncomfortable seating.

Thu, Mar 29
PHL
DEN
7h 38m
Fri, Apr 6
DEN
PHL
3h 26m
Trip: 9 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Dec 15
PHL
DEN
4h 40m
Tue, Dec 19
DEN
PHL
3h 39m
Trip: 5 days
5.0OkayShow reviews
Overall 5.0 Okay
Based on 132 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
DEN
Mediocre 2.0

Nothing

Everything

PHL
DEN
Excellent 10.0

The only thing I didn't care for was that when my flight was delayed by three hours; when I landed the crew in the airport because an attendant refused to take minute to look at my ticket. If she had looked at my ticket she would have seen that I didn't miss my connecting flight because it was also delayed by three hours. I almost missed my connecting flight because this artentand kept refusing to help me and kept sending me to customer service who would have told me to get on my same connecting flight. The attendant was working at the desk near my connecting flight but refused to take a minute to try to help me even though she wasn't busy nor was she helping someone. I had to figure this out on my own while standing in line at customer service, which had about 100 people waiting who also missed their flight so I would have missed my flight if I had done what the frontier attendant from my connecting flight desk had instructed me to do. I had to run back to the gate minutes before boarding ended almost missing my connecting flight because of the attendant. Attendant worked at the denver , co airport. The crew on the plane and everyone else was great. Also didn't care for the charge for a carry on bag.

PHL
DEN
Excellent 8.0

Seating

PHL
DEN
Mediocre 3.6

My seat broke and the flight attendant said there was nothing they could do. Ten minutes later a woman asked to move her seat for more comfort and he allowed it. I slid out of my seat the whole flight.

PHL
DEN
Mediocre 3.3

Cheap

Not cheap after you pay for everything they hide.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.