DEN - PHL

$125 Find Cheap Flights from Denver to Philadelphia - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Philadelphia departing on 9/10. 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, 0 bags

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Philadelphia.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Philadelphia.
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Everything you should know

Cheapest round-trip
$238
Typical prices: $374-$217
Southwest
Tue 9/1Sat 9/12
DEN - PHL • 1 stop
Cheapest non-stop
$243
Typical prices: $473-$263
Frontier
Thu 7/9Tue 7/14
DEN - PHL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Frontier Economy Bundle adds a carry-on and seat choice for budget value.
Southwest free carry-on helps, while flexible changes add booking confidence.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $238 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with American Airlines, Frontier and others. Average duration is 3h 38m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 11% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 22% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Philadelphia!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Denver to Philadelphia (DEN-PHL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to Philadelphia 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 Denver to Philadelphia

Tue, Sep 1 - Sat, Sep 12
Southwest Logo
6:30 am - 4:00 pm
DEN
-
PHL
7h 30m
1 stop
Southwest Logo
4:50 pm - 6:45 pm
PHL
-
DEN
3h 55mnonstop
$238Southwest
Tue, Aug 4 - Sun, Aug 9
Multiple Airlines Logo
11:37 pm - 8:37 am
DEN
-
PHL
7h 00m
1 stop
Multiple Airlines Logo
8:37 pm - 11:04 pm
PHL
-
DEN
4h 27mnonstop
$241Multiple Airlines
Sat, Aug 15 - Tue, Aug 18
Multiple Airlines Logo
6:05 am - 11:49 am
DEN
-
PHL
3h 44mnonstop
Multiple Airlines Logo
8:28 am - 1:15 pm
PHL
-
DEN
6h 47m
1 stop
$242Multiple Airlines
Thu, Jul 9 - Tue, Jul 14
Frontier Logo
6:05 am - 11:49 am
DEN
-
PHL
3h 44mnonstop
Frontier Logo
12:44 pm - 2:58 pm
PHL
-
DEN
4h 14mnonstop
$243Frontier
Wed, Aug 12 - Sun, Aug 16
Multiple Airlines Logo
11:37 pm - 8:22 am
DEN
-
PHL
6h 45m
1 stop
Multiple Airlines Logo
8:37 pm - 11:04 pm
PHL
-
DEN
4h 27mnonstop
$244Multiple Airlines
Fri, Jul 10 - Tue, Jul 14
Frontier Logo
6:05 am - 11:49 am
DEN
-
PHL
3h 44mnonstop
Frontier Logo
12:44 pm - 2:58 pm
PHL
-
DEN
4h 14mnonstop
$245Frontier
Wed, Sep 2 - Sun, Sep 6
Multiple Airlines Logo
10:46 am - 5:20 pm
DEN
-
PHL
28h 34m
1 stop
Multiple Airlines Logo
12:42 pm - 2:56 pm
PHL
-
DEN
4h 14mnonstop
$246Multiple Airlines
Fri, Jul 3 - Tue, Jul 7
Frontier Logo
11:59 pm - 5:38 am
DEN
-
PHL
3h 39mnonstop
Frontier Logo
12:44 pm - 2:58 pm
PHL
-
DEN
4h 14mnonstop
$247Frontier
Sat, Jul 25 - Thu, Aug 6
Frontier Logo
6:05 am - 11:49 am
DEN
-
PHL
3h 44mnonstop
Frontier Logo
8:37 pm - 11:04 pm
PHL
-
DEN
4h 27mnonstop
$248Frontier
Sat, Oct 24 - Sat, Nov 7
American Airlines Logo
2:00 pm - 7:47 pm
DEN
-
PHL
3h 47mnonstop
American Airlines Logo
8:59 am - 11:19 am
PHL
-
DEN
4h 20mnonstop
$249American Airlines
Booking Insights

KAYAK's insights & trends for Denver to Philadelphia flights

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

How much is a round-trip flight from Denver to Philadelphia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Denver to Philadelphia departing in September.

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

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

Your flight ticket price will generally be cheaper if you fly to Philadelphia on a Thursday and more expensive on a Monday. On your return trip to Denver, you should consider flying back on a Friday, and avoid Sundays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Philadelphia, 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 Denver to Philadelphia is February, where tickets cost $263 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $438 and $397 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to Philadelphia, 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 Denver to Philadelphia, you should book around 2 weeks before departure, which saves you about 11% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Expert advice

Expert advice for your flight from Denver to Philadelphia

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier and United Airlines

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Harriet Baskas

Harriet Baskas

Expert on American Airlines, PHL and DEN

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Good to know

Low seasonJanuary
Cheapest flight$125
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly with an average 29% increase in price.
Flight from Denver to Philadelphia

When to book flights from Denver to Philadelphia

Are your dates flexible? Find out the best times to travel from Denver to Philadelphia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Denver to Philadelphia

  • Where can I sleep at Philadelphia International Airport?

    The Philadelphia Airport Marriott is an airport hotel at PHL. To get to this establishment, you can take the free shuttle that departs every 20min from the terminals or the Skybride from Terminal B. The other option is Minute Suites, ideal if you only need a place to sleep. This establishment is located at the Terminal A-B Link, Airside. They offer day rooms and workstation cubicles where you can nap, work, or relax. Each suite features a daybed sofa, HD TV, Wi-Fi, power outlet, sound masking system, desk, and phone.

  • Does Philadelphia International Airport offer accessible services?

    Elevators and ramps are provided for barrier-free access to passengers in wheelchairs. There are also reserved parking spots, accessible restrooms, and accessible water fountains for passengers with limited mobility. The airport also works with Aira to provide safe passage for passengers with low vision. These passengers also get tactile guide paths and braille signage around the airport. TTY and courtesy telephones are also available for the hearing impaired to request assistance.

  • What are transport options from Philadelphia International Airport?

    You can easily connect to downtown Philadelphia using the SEPTA (Southeastern Pennsylvania Transportation Authority) trains. You can use this connection to get downtown and Amtrack connections, and you’ll find the PHL train platforms at Terminals A-East, B, C, D, and E baggage claim. PHL is also served by the SEPTA bus route, with buses headed from the airport to South Philadelphia and Chester, 69th Street Transportation Center, and Suburban Square in Ardmore. Taxis are also an option at the rank outside the terminals, and car rental companies have their desks in the ground transportation area.

  • What family services are offered at Philadelphia International Airport?

    Passengers traveling with children will have access to the Mamava Suites, which have fold-down desks, power outlets, comfortable seating, and are lockable from inside. For nursing mothers using the sleep pods, they will get 30min free. The airport has also provided several companion care and family restrooms around the airport. The airport also has a kids’ play area at Terminal A-East for those traveling with the older kids. The “Ready For Take-Off” children’s play area features climbing structures, toys, and everything your kid needs to have fun.

  • What is the cheapest flight from Denver to Philadelphia?

    In the last 5 days, the lowest price for a flight from Denver to Philadelphia was $124 for a one-way ticket and $238 for a round-trip.

  • Do I need a passport to fly between Denver and Philadelphia?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from Denver to Philadelphia?

    When flying out of Denver you will be using Denver Intl. You will be landing at Philadelphia, also known as Philadelphia.

  • Which airlines offer Wi-Fi service onboard planes from Denver to Philadelphia?

    American Airlines, JetBlue, Delta, United Airlines, and Lufthansa offer inflight Wi-Fi service on the Denver to Philadelphia flight route.

  • Which aircraft models fly most regularly from Denver to Philadelphia?

    The Boeing 737-800 is the aircraft model that flies most regularly on the Denver to Philadelphia flight route.

  • Which airline alliances offer flights from Denver to Philadelphia?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Denver and Philadelphia, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Denver to Philadelphia?

    There are nonstop flights from Denver to Philadelphia on a daily basis.

  • Which is the best airline for flights from Denver to Philadelphia, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Denver to Philadelphia are Southwest and Delta. With an average price for the route of $411 and an overall rating of 7.9, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $387 and an overall rating of 7.9.

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

    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 Denver to Philadelphia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Denver 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 Denver to Philadelphia?

    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 to Philadelphia with an airline and back to Denver with another airline. Booking your flights between Denver and PHL can sometimes prove cheaper using this method.

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

    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 to Philadelphia from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Denver to Philadelphia

  • Looking for a cheap flight? 25% of our users found flights on this route for $201 or less one-way and $375 or less round-trip.
  • Denver International Airport (DEN) is a large airport with one main terminal (Jeppesen Terminal) and three concourses. The airport is big, and for easy movement within the airport complex, DEN has a free shuttle service and an underground train that connects the main terminal to the three concourses.
  • Pets are welcome to travel through DEN. The airport has provided pet relief areas at Gates A, B, and C and an outdoor area outside Door 200, Jeppesen Terminal.
  • Around 850 kg of carbon is emitted per passenger on flights from Denver to Philadelphia. However, flying with American Airlines, Frontier Airlines, and United Airlines significantly reduces this, as these airlines emit 59%, 56%, and 47% less carbon per passenger, respectively.
  • Fly with American Airlines, United Airlines, or Delta for a chance to relax at their premium lounges at DEN before your flight. These airlines operate premium lounges at DEN, requiring your flight ticket and a pre-purchased pass for admittance.
  • If you have some time after your flight to Philadelphia International Airport (PHL), check out the art exhibits around the airport or view planes landing and taking off from the observation decks in each terminal. XpresSpa at PHL also offers manicures, pedicures, massages, and facials, and you’ll find them at Terminals C, D, and F.

Prefer to fly direct from Denver to Philadelphia?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Denver Intl to Philadelphia.
Find which airlines fly direct from Denver Intl Airport to Philadelphia Airport, which days they fly and book direct flights.

Direct departures

Denver Intl to Philadelphia

Monday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Tuesday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Wednesday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Thursday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Friday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Saturday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Sunday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

See more direct flights

Direct returns

Philadelphia to Denver Intl

Monday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Tuesday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Wednesday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Thursday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Friday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Saturday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

Sunday

American Airlines,Frontier,Southwest, +1 more

American Airlines,Frontier, +2 more

See more direct flights

Reviews of the top 5 airlines serving from Denver to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from Denver to Philadelphia. 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 Denver to Philadelphia? 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.
7.9
SouthwestOverall score based on 4237 reviews
7.5Entertainment
8.6Crew
7.0Food
8.0Comfort
8.1Boarding
Airline reviews

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

10.0 ExcellentAnonymous, Jun 2026
OKC - LAS
Read more Southwest reviews

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

OKay. I sat in the back of the plane and it was really loud between babies and little kids, and adults who.like to talk a lot and loudly most of the flight.

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Was fine, delayed and feels like southwest is always late

I don't know why flying out of Sarasota requires two plane changes.

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

The flight was smooth. The Southwest experience has degraded overall, but this one was okay.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

Destroyed my suitcase. Tired of talking about it. Cancelling my unite mileage plus account.

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

It was a short flight so I was expecting too much

Had a one hour delay due to mechanical issue. I didn’t think I’d be able to make my connecting flight, but they waited for me and greeted me when I arrived to help things run smooth.

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Really hard landing... as in slammed into the runway then hit the brakes really hard ...

Every staff member was professional, friendly and courteous. The pizza twist was ok. It was warm but too much dough.

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

Flight left on time and we arrived 25 minutes early! There was a gate available when we arrived so early on a busy Sunday afternoon! Flight attendants came around twice with the drinks cart.

Cancelled flight. Still waiting to get home for grand daughter’s graduation .

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

As we approached Denver, we encountered quite a bit of turbulence. I know this can sometimes be the case as I frequently fly this route but not on American. My gripe: Usually a pilot or co-pilot alerts passengers to the possibility of turbulance ahead of time. This did not occur nor did he communiucate during what was a pretty rough ride.

When I booked my flight a month ago - I selected a seat. That seat was NOT the one I ended up with when I checked into my flight the day before. This is the second time this has occurred. So, I checked my next flight on Wednesday and Thursday and no seat was assigned. Poor, very poor customer service.

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

American Airlines did everything they could with the high Spring Break crowd. I was frustrated to be changed from 1st class to a middle seat at the back of the plane. This has happened before, not sure booking 1st class and paying the extra actually works.

I didn't end up taking this flight. I got up at 4am for a flight that was supposed to board at 6am - at 5:55am you delayed the flight to 10am. The airport is under construction so I switched to a later flight as I wasn't going to sit in the airport for 4 hours. They said the delay was due to the crew needing rest from a flight coming in late the night before - if that was the case then I think you should have delayed the flight much sooner so that passengers wouldn't get up so early and get to the airport to sit and wait.

I very rarely fly American and my experience today reenforces that is the correct decision. While the staff were all very courteous, our flight was first thing in the morning so there was no reason to be delayed, yet appropriate maintenance checks weren’t completed prior to our flight so we were delayed multiple times. Not a great showing, American Airlines.

Boarding is always an ordeal. Less dogs on flights. I am highly allergic to dogs and cats. Why are there so many animals these days?

I was on a small regional flight from Detroit to Philadelphia. When we landed the outside cruise needed to turn something off with the engine, which took quite a long time. Then, when they allowed us to get off the plane it was outside. They took their time, unloading all the luggage and waited till they unloaded all the luggage before they brought it over to us. It was 9 o’clock at night freezing cold out, and there was no proactive hustle to try to get people their luggage. It was really one of the worst experiences I think I’ve ever had with American until a manager came over. I don’t think they were going to even consider pulling the luggage over to the people that had been waiting outside for at least 10 minutes in the freezing cold.

The gate attendant in Boston had a high raspy voice and spoke much too fast to be understood. Not pleasant.

The flight was delayed for more than 3 hours the flight attendant was so angry, it was my first flight with JetBlue but i don’t think I flight with them again.

Since we started at syr the service, crews, and flights were just excellent

It was fine for what it was. It’s not luxury travel but it was efficient, for the most part. Having my carry-on transferred into luggage however, was unwelcome.

We had better-than-average leg room and I loved the access to shows and movies. During boarding, we could not hear the agent even though we were close to the boarding door, which was kind of scary when we realized that half of the passengers had already boarded. Also, the entertainment was awesome, but I could not hear the movie as well as I would have liked, because my headphones were crappy. It would have been better if I could connect my own ear buds via Bluetooth or if JetBlue provided headphones.

On time, friendly attendants, quick wheelchair assistance and help checking in bags. Also appreciated change in seats, more forward to make it easier for my 97 year old mother to board and exit the plane. Thank you, JetBlue!

Flight did not have onboard charging and TV screen flickering.

I was seated next to an autistic child who was out of control and had a child behind me kicking my seat for most of the trip. I will never fly JetBlue again. Ever. I don't care how cheap it is. It's terrible.

Boarding process was terrible. No assigned seat until the gate, then a long line to get seat assignment.

This was the first flight I've taken since pre-pandemic. I was pleased with how orderly the boarding and disembarking went. The seats were comfortable. I loved that there was no "first class'. The attendants and passengers I met were all very friendly and welcoming.

There weren't enough employees at check in took awhile to get bags checked. There wasn't a wheel chair for me, I was sent to someone who turns out to work for a different airline, if My flight hadn't been delayed I probably would have missed my flight as it was, by the time I arrived at my gate, they started boarding in about 15 minutes. I don't know who took me to my gate, definitely was not the normal people who take passengers to the gate. I'm guessing she may have been in a management position. I wish I knew her name, she went beyond to help me. With that said everyone was kind, and were doing the best they could. So, I choose to say it was an Adventure, stressful start, but good. In the end went well. The situation was not only difficult for passengers but the employee's.

The staff at the check in counter was so rude. Made you feel Incompetent

Frontier scheduled a 40 minute connection in DEN. What they failed to mention was that they “close the doors” 20 mins prior to departure, which means you only have 20 mins. Not enough time. Possibly against DOT regulations. Filing complaint.

Flight was scheduled at 9:40pm. Got delayed to 10 am, the next day. crazy

The bag check, flight check-in, and onboard experience convinced my wife and me that we will actively go out of our way to avoid flying Frontier Airlines in the future. At bag check, we were informed that check-in could only be completed via the Frontier mobile app. Unfortunately, the app was extremely frustrating—sending us through repetitive, confusing loops that repeatedly forced us to decline add-on services with nearly every click. While most airline apps upsell, this one felt intentionally exhausting. As the process dragged on, we became genuinely concerned that my phone battery would die before check-in could be completed. We approached the bag check staff—who were standing together talking—and explained both our frustration and our predicament. They laughed. Later, my wife described the interaction as “gaslighting,” which felt accurate. We were then informed it would cost $25 per person simply to have our boarding passes printed. From that point forward, the tone of the experience was consistently hostile. The bag check employees were condescending and combative, behaving more like bullies than customer service staff. Unfortunately, that same attitude continued onboard. One flight attendant argued with me when I attempted to stow my backpack in the overhead bin. I explained that we had each paid $75 to check our bags specifically so we would not need to use carry-on space and could have adequate legroom. She demanded to see my ticket, pointed out that it said “no carry-on”—which I acknowledged—and I reiterated that this was precisely why we paid to check our bags. Her response was, “I don’t make the rules.” She then walked away, but not before asking if I “truly wanted to fly back to Chicago today?”—an unnecessary and unmistakable threat. It is also worth noting that despite booking our tickets together in the same transaction, we were not seated together. Upon our return to Chicago—where we could once again sit together—we compared onboard experiences. We both remarked on how unhappy the flight attendants appeared and how each of us was separately asked whether we would like to purchase a beverage. We declined. At no point was water mentioned as an option, leaving us with the clear impression that even water came at a cost—or that complimentary water, if available at all, was deliberately left unmentioned. Overall, the experience was shocking and deeply disappointing, but it was also a profound learning experience—one we will not forget and will not repeat. -Steve

Plane was hot and miserable and the crew was rude!

12 hour delay required getting on and off plane 3 times - would have at least liked to have been offered a snack or drink

They didn’t offer a water, even after I asked

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

Everything you need to know for your flight from Denver to Philadelphia

Other airlines flying from Denver to Philadelphia

Flights from the other most popular airlines that fly from Denver to Philadelphia according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.