$53 Find Cheap Flights from Philadelphia to Colorado

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Colorado departing on 8/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Colorado

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Colorado.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Colorado.
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Best Colorado Flight Deals from Philadelphia

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Denver
Denver1 stop$108
Aspen
Aspen1 stop$253
Grand Junction
Grand Junction1 stop$289
Durango
Durango1 stop$292
Montrose
Montrose1 stop$326
Hayden
Hayden1 stop$465
Gunnison
Gunnison1 stop$592
Alamosa
Alamosa2 stops$650
Vail
Vail1 stop$419
Denver
Denver1 stop$108
Aspen
Aspen1 stop$253
Grand Junction
Grand Junction1 stop$289
Durango
Durango1 stop$292
Montrose
Montrose1 stop$326
Hayden
Hayden1 stop$465
Gunnison
Gunnison1 stop$592
Alamosa
Alamosa2 stops$650
Vail
Vail1 stop$419

Cheap Flights from Philadelphia to Colorado

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Colorado that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Colorado

Mon, Aug 4 - Fri, Aug 22
Frontier Logo
5:25 am - 11:56 pmPHL-DEN
20h 31m1 stop
Frontier Logo
12:34 am - 3:05 pmDEN-PHL
12h 31m1 stop
$108Frontier
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Tue, Aug 5 - Fri, Aug 22
Frontier Logo
11:09 am - 9:17 pmPHL-DEN
12h 08m1 stop
Frontier Logo
12:34 am - 3:05 pmDEN-PHL
12h 31m1 stop
$111Frontier
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Wed, Sep 3 - Wed, Sep 10
American Airlines Logo
8:35 am - 4:10 pmPHL-ASE
9h 35m1 stop
American Airlines Logo
12:11 pm - 11:29 pmASE-PHL
9h 18m1 stop
$253American Airlines
Find Deal
Wed, Sep 3 - Wed, Sep 10
American Airlines Logo
8:45 am - 4:10 pmPHL-ASE
9h 25m2 stops
American Airlines Logo
4:49 pm - 1:10 amASE-PHL
6h 21m1 stop
$258American Airlines
Find Deal
Thu, Oct 9 - Wed, Oct 15
Delta Logo
2:40 pm - 9:20 pmPHL-COS
8h 40m1 stop
Delta Logo
1:40 pm - 12:23 amCOS-PHL
8h 43m1 stop
$357Delta
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Tue, Oct 7 - Wed, Oct 15
Delta Logo
1:00 pm - 9:20 pmPHL-COS
10h 20m2 stops
Delta Logo
1:40 pm - 12:23 amCOS-PHL
8h 43m1 stop
$362Delta
Find Deal
Tue, Aug 12 - Fri, Aug 15
Southwest Logo
3:40 pm - 10:00 pmPHL-COS
8h 20m2 stops
Southwest Logo
10:45 am - 9:55 pmCOS-PHL
9h 10m2 stops
$405Southwest
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Sat, Aug 16 - Sat, Aug 23
United Airlines Logo
8:15 am - 6:22 pmPHL-ASE
12h 07m2 stops
United Airlines Logo
10:30 am - 7:20 pmASE-PHL
6h 50m1 stop
$409United Airlines
Find Deal
Mon, Jul 28 - Mon, Aug 4
Southwest Logo
1:15 pm - 7:10 pmPHL-COS
7h 55m1 stop
Southwest Logo
3:50 pm - 12:25 amCOS-PHL
6h 35m1 stop
$412Southwest
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Sat, Aug 16 - Sat, Aug 23
United Airlines Logo
6:20 am - 11:16 amPHL-MTJ
6h 56m1 stop
United Airlines Logo
7:30 am - 3:49 pmMTJ-PHL
6h 19m1 stop
$431United Airlines
Find Deal
Useful Info

KAYAK's insights & trends for Philadelphia to Colorado flights

Get data-powered insights and trends into flights from Philadelphia to Colorado to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Philadelphia to Colorado flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Philadelphia to Colorado.

The cheapest ticket to Colorado from Philadelphia found in the last 72 hours was to Denver, at $180 round-trip. The most popular route is from Philadelphia (PHL) to Denver (DEN), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $180.

Can I save money by flying with a layover from Philadelphia to Colorado?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $919 on average.

What is the cheapest month to fly from Philadelphia to Colorado?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to Colorado, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Philadelphia to Colorado is September, when tickets cost $243 (return) on average. On the other hand, the most expensive months are December and March, when the average cost of round-trip tickets is $380 and $347 respectively.

What’s the cheapest day of the week to fly from Philadelphia to Colorado?

The average price of all round-trip flights from Philadelphia to Colorado clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Colorado on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Philadelphia to Colorado. For your return ticket, we recommend flying on a Wednesday and avoiding Sundays for the best deals.

How far in advance should I book a flight from Philadelphia to Colorado?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Philadelphia to Colorado, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Philadelphia to Colorado, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.


Good to know

Low seasonJanuary
High seasonAugust
Cheapest flight$53
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from Philadelphia to Denver

FAQs - booking Colorado flights

  • How large can a carry-on bag be on a flight from Philadelphia to Colorado?

    A good way to get around spending a small fortune on baggage fees is by only bringing a carry-on bag with you as you fly from Philadelphia to Colorado. But you will need to make sure your bag isn't too big to fit on your plane. Airlines like American Airlines will ask you to bring a carry-on bag no larger than 22 x 14 x 9 inches.

  • Are there any small airports near Philadelphia that might be good alternatives?

    If you would prefer to fly out of a smaller airport than Philadelphia International Airport (PHL), Atlantic City International Airport (ACY) might be a good option. It's not too far away from Philadelphia International Airport, and it offers flights to Denver (DEN), Vail (EGE), Aspen (ASE), and other parts of Colorado.

  • Can you get free Wi-Fi on airlines that fly from Philadelphia to Colorado?

    Most airlines will only provide first-class passengers with free Wi-Fi on flights to Colorado. But if you fly with an airline like Delta, you might be able to get Wi-Fi without paying for it. Simply sign up for the SkyMiles program and you'll get to use Delta's Wi-Fi without paying for it.

  • How can I make a flight from Philadelphia to Colorado more sustainable?

    To make sure your flight from Philadelphia to Colorado is sustainable, fly with an airline like United Airlines. United is in the process of making a push to become carbon-neutral. The airline is doing it by gradually upgrading its fleet and all the equipment it uses on the ground.

  • How does KAYAK find such low prices on flights from Philadelphia to Colorado?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Colorado.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to Colorado?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Philadelphia to Colorado is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to Colorado?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Philadelphia to Colorado with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to Colorado?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Philadelphia to Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Colorado?

    The cheapest time of day to fly to Colorado is generally at night, when round-trip flights cost $234 on average. Morning departures are around 10% cheaper than evening flights, on average. The most expensive time of day to fly to Colorado is generally in the evening, which is peak travel time and where the average cost of a ticket is $427.

Top tips for finding cheap flights to Colorado

  • Looking for a cheap flight? 25% of our users found tickets from Philadelphia to the following destinations at these prices or less: Denver $152 one-way - $227 round-trip
  • Anyone who would like to fly from Philadelphia International Airport (PHL) to Colorado will be able to do it through a number of different airlines. Delta, Frontier, Spirit Airlines, and United Airlines all have flights that depart from here. However, because Philadelphia International Airport is a hub for American Airlines, it often offers the most flights to Colorado.
  • Outside of thinking about which airline you would like to fly with when traveling from Philadelphia to Colorado, you should also give thought to which airport you want to arrive at Denver International Airport (DEN) is where most airlines will head when en route to Colorado. But you'll also have the option to stop at Denver and catch connecting flights to other Colorado airports such as Eagle County Regional Airport (EGE) and Aspen/Pitkin County Airport (ASE).
  • If you're traveling from Philadelphia to Colorado to go skiing, you might be wondering if you can bring your ski equipment along. You'll be happy to hear that most airlines will allow you to fly with it. You will, however, need to check your ski equipment just like you would check bags and pay extra for them if you aren't flying first class.
  • Those who can swing it should try to fly first class from Philadelphia to Colorado whenever possible. In addition to the fact that you'll be able to check bags for free when you have a first-class ticket, you'll also get amenities like extra legroom and a long list of menu options when you're in first class. It'll allow you to relax as you make your way to your destination.
  • Philadelphia International Airport has places for you to kill time if you arrive early for a flight to Colorado. The Admirals Club will be open to any passengers flying with American Airlines. There are also other lounges like the American Express Centurion Lounge.

Reviews of the top 5 airlines serving from Philadelphia to Colorado

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Colorado. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Colorado? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4278 reviews
7.6Entertainment
8.6Crew
8.2Boarding
8.0Comfort
7.0Food
Airline reviews

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

4.0 OkayTraci, Jun 2025OAK - SEA
Read more Southwest reviews

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

For my birthday trip this was my second time ever flying, this trip was the best.

after landing, we stay 2 hours on the taxi way before reaching the gate The airline and the crew were good though

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Sat on tarmac for 2 hours and then missed my connecting flight

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

Everything was on time. I was disappointed by the front section female, African American flight attendant. I did not see her name tag or would have identified by name not race. As passengers moved to the bathroom early in flight, she would say with a disdainful tone “I have to say the seat belt light is on” then go back to her book. Better trained flight attendants say something like be careful the seat belt light is on.

Cluster mess boarding. Can't wait for SWA reserved seating. Internet didn't seem to work on the plane.

Flights delayed by 4-6 hours. Boarding was a mess and unclear. Bags were not at arrival airport and had never even been put on the plane. No idea when I’ll get them. Don’t fly into Denver!

Crew was excellent. Comfort seats not as nice as other kinds of planes.

Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

Flight was an hour late, who knows why. It was OK, nothing outstanding.

Only not having an assigned seat was an issue. Rest was great

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

Boarding was organised and relaxed. Crew were fantastic! Seats were lacking padding causing butt pain and stiffness.

I like for how they process during check in. It was very smoothly.

The flight was scheduled for 2:30 PM. Early in the morning we got a text message saying the flight was delayed and rescheduled for 3:00 PM. We got to the airport with that in mind. Then we got a message during check-in at the flight was rescheduled again for 2:30 PM. We almost missed our flight. In fact, our bags Were told that they would not make it. At the end, everything worked out. But it is very stressful.

Very rough getting into denver. my kid threw up it was so rough.

Why wasn't this flight departure scheduled eith another crew so that it could leave on time? When we arrived in Denver we had so little time between flights we had run to the connecting flight. We should received some credit for the inconvenience.

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

Food choices were very limited. Taste of the dishes was average.

I liked all the informational texts. I always knew where to go and when .

Received an email the night before showing that there would be seatback entertainment on our flight. We get on and there was no seatback entertainment. And then it was a scramble to try to set up the iPads for the kids before takeoff so they could watch something for the four hour flight.

The reason I don’t fly United. No in seat entertainment for a long flight and inconsistent WiFi and entertainment available from my device.

We started with trouble checking in 24 hours early. Then my husband did not get his TSA precheck. Finally flight delayed due to no crew. I know things happen

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

It’s a great flight. Service is good. Staff is awesome.

Again flight was awesome except British Airways lost both gate checked luggage’s. Still missing

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

late again! but its my only option to not take 9 hours to get to Memphis

Almost everything was outstanding. First, we boarded on time and the flight crew did a great job getting everyone seated. Then the pilots took their time and care to make sure the plane was full de-iced three times as there was a bad ice storm a few hours earlier. The plane ride was smooth and comfortable and even the economy seats had decent room and comfort. Flight Attendant Lisa went above and beyond to make sure I was comfortable - she is outstanding. The only thing wrong with the flight, and it is something which needs to be addressed, is that the gate to gate time was over 6.5 hours and not one meal was served. The only thing offered to eat were two small cookies for a transcontinental flight - unacceptable. Charge me more but give me a meal for a long flight. Thankfully Lisa found something for me.

Very poor. Our special services attendant gave us incorrect information. I also was mishandled at landing. There was no wheelchair waiting. I fell deboarding the plane. Appalling!

Flight was late. Missed connecting in Denver. My new flight is more than 24 hours later and I have no room, vouchers, or compensation, and might also be bumped from the one tomorrow.

This was one of the first frontier airline flights this spring that wasn't delayed. It actually left on time. Some of the flight crew did not look happy, they didn't smile when the passengers were boarding or getting off the plane, and the passengers initiated greetings, not the staff. To me this was an odd experience to have with any flight/airline. I had a bad experience booking this flight. The price didn't solidify until late hours into the night. Ever time I purchased the ticket, I either received a denial email or an error because the price has changed, but it was never reflected on the flyfrontier or kayak websites until way after midnight on the date of travel. This caused me anxiety and irritation with the websites. Then I noticed a mishap with my name on my voucher as I went to check in, it was incorrect. When I proceeded to correct it, Frontier had no easy, let alone free, way to remedy it. I couldn't correct my name without a $75 charge, I couldn't cancel my voucher to repurchase it with the correct name without a $100 charge, because it was too close to departure. Then calling frontier was nearly impossible to remedy the situation with a human. It's already difficult to want to choose frontier because of all the upcharges, but you feel kinda trapped into doing so because it's the more affordable airline.

Our flight was cancelled. They could do nothing to help us get another flight that was timely. Because the first leg was cancelled we were unable to get to our connection. We had to book on an entirely different airline for today. So we spent more money, lost a day of vacation and will never fly Frontier again, so the 'we are sorry, here is $100 credit' is a joke since we won't be flying on Frontier.

You get what you pay for nothing essentially but a hard uncomfortable seat that doesn’t recline and kids screaming all around you and chaotic boarding and limited check bag weight allowance when compared to other airlines

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Not very good. Paid in excess of $400 for assigned seating for my family and that was not provided. I want that money back.

Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.

The plane failed preflight inspection, so we sat there for 90 mins while they tried to fix it. Ultimately, everything was remedied and we made our connecting flight; instead of a 2 hour layover at the airport, we spent it waiting on the plane.

Check in at Philadelphia international was absolutely terrible! I fly 2 to 3 times a month and avoid frontier at all cost and will never fly Frontier again! The night before travel, I tried checking in however, the app was giving me an error, so I went to the desktop, which instructed you that you need to use the app. The next day I presented at the check-in gate after trying at least a half dozen times prior to getting into the airport and continuing to getting the error in the app. I actually had rebooted my phone numerous times and reinstall the app just in case. My phone is only one generation older than the current model. It has no problems completing a frontier flight purchase or any other app issues. There was only three frontier employees working at check-in and a huge line while I was in line I continued to try and check in via the app. As I approach the desk, I was dreading dealing with the agent. He was extremely unprofessional, anti-semantic & very ignorant, and mean to the people in front of me, as well as the people who ended up being behind me. He literally told people “Man I don’t care bout y’all” in his native dialect! Maintaining my composure I approached and explained the situation. To which he replied, you’re gonna have to pay then! I don’t understand. It’s an issue with their app not allowing me to check in! Not my issue! He told me if I pay cash it would be $15, $25 if I pay credit card. I don’t understand a $10 difference for paying with a credit card? I am completely cashless so I continued to try using the app to avoid the $25 fee, Which I still don’t believe that I should be responsible for since it was Frontier’s technical issue!!! I continued to check in via the app a couple more times after he verified I was doing everything right he proceeded to continue to belittle the people behind me. Yelling at them saying I don’t care about you people! I cannot believe that this is the way that businesses would treat its customers! Unfortunately, the black mail with dreadlocks did not have a name tag all he had was a frontier sweater on! For the $25 fee that I ended up getting charged on my credit card. I should’ve just booked originally with Spirit or any other carrier! I have no problem paying fees that I should be responsible for, but when it’s due to a technical failure of a company, the customer should not be responsible for it! I cannot believe that it’s not frontier going out of business!

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

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