155 € Cheap Flights from Philadelphia to Denver International

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Flight deals from Philadelphia to Denver International

Looking for a cheap last-minute deal or the best return flight from Philadelphia to Denver International Airport? If you want to travel next month, return fares start from 191 €. Find the lowest prices on one-way and return tickets right here.

Denver.155 € per passenger.Departing Fri, 7 Aug, returning Wed, 12 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Fri, 7 Aug, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Wed, 12 Aug, arriving in Philadelphia International.Price includes taxes and charges.From 155 €, select.

Denver.165 € per passenger.Departing Fri, 31 Jul, returning Wed, 5 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Fri, 31 Jul, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Wed, 5 Aug, arriving in Philadelphia International.Price includes taxes and charges.From 165 €, select.

Denver.179 € per passenger.Departing Sat, 25 Jul, returning Sat, 1 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Sat, 25 Jul, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 1 Aug, arriving in Philadelphia International.Price includes taxes and charges.From 179 €, select.

Denver.179 € per passenger.Departing Sat, 15 Aug, returning Sat, 22 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Sat, 15 Aug, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 22 Aug, arriving in Philadelphia International.Price includes taxes and charges.From 179 €, select.

Denver.180 € per passenger.Departing Wed, 16 Sep, returning Wed, 23 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Wed, 16 Sep, arriving in Denver International.Inbound indirect flight with Southwest Airlines, departs from Denver International on Wed, 23 Sep, arriving in Philadelphia International.Price includes taxes and charges.From 180 €, select.

Denver.188 € per passenger.Departing Tue, 30 Jun, returning Tue, 7 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Tue, 30 Jun, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 7 Jul, arriving in Philadelphia International.Price includes taxes and charges.From 188 €, select.

Denver.191 € per passenger.Departing Tue, 21 Jul, returning Sat, 25 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Tue, 21 Jul, arriving in Denver International.Inbound indirect flight with Frontier Airlines, departs from Denver International on Sat, 25 Jul, arriving in Philadelphia International.Price includes taxes and charges.From 191 €, select.

Denver.192 € per passenger.Departing Sat, 29 Aug, returning Tue, 1 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Sat, 29 Aug, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Tue, 1 Sep, arriving in Philadelphia International.Price includes taxes and charges.From 192 €, select.

Denver.195 € per passenger.Departing Wed, 8 Jul, returning Sat, 11 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Wed, 8 Jul, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 11 Jul, arriving in Philadelphia International.Price includes taxes and charges.From 195 €, select.

Denver.209 € per passenger.Departing Wed, 2 Sep, returning Sun, 6 Sep.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Wed, 2 Sep, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sun, 6 Sep, arriving in Philadelphia International.Price includes taxes and charges.From 209 €, select.

Denver.212 € per passenger.Departing Sat, 6 Jun, returning Sat, 13 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Sat, 6 Jun, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 13 Jun, arriving in Philadelphia International.Price includes taxes and charges.From 212 €, select.

Denver.224 € per passenger.Departing Sat, 27 Jun, returning Sat, 4 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Sat, 27 Jun, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 4 Jul, arriving in Philadelphia International.Price includes taxes and charges.From 224 €, select.

Denver.246 € per passenger.Departing Tue, 29 Sep, returning Fri, 2 Oct.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Tue, 29 Sep, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Fri, 2 Oct, arriving in Philadelphia International.Price includes taxes and charges.From 246 €, select.

Denver.253 € per passenger.Departing Tue, 30 Jun, returning Sat, 1 Aug.Return flight with United.Outbound indirect flight with United, departs from Philadelphia International on Tue, 30 Jun, arriving in Denver International.Inbound indirect flight with United, departs from Denver International on Sat, 1 Aug, arriving in Philadelphia International.Price includes taxes and charges.From 253 €, select.

Denver.265 € per passenger.Departing Sat, 17 Oct, returning Tue, 20 Oct.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Philadelphia International on Sat, 17 Oct, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Tue, 20 Oct, arriving in Philadelphia International.Price includes taxes and charges.From 265 €, select.

Denver.274 € per passenger.Departing Tue, 10 Nov, returning Wed, 18 Nov.Return flight with United.Outbound indirect flight with United, departs from Philadelphia International on Tue, 10 Nov, arriving in Denver International.Inbound indirect flight with United, departs from Denver International on Wed, 18 Nov, arriving in Philadelphia International.Price includes taxes and charges.From 274 €, select.

Find the cheapest month to fly from Philadelphia to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia to Denver International flights are currently cheapest in August.

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Direct flights from Philadelphia to Denver International

Philadelphia to Denver International: Alternative routes

Compare routes from Philadelphia to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

Philadelphia to Denver: Flight information

The things to know before you go.

Cheapest flight found	155 €
Cheapest month to fly	August
Average flight time	4 hrs, 13 mins
Most popular airline	Southwest Airlines
Average flights per week	115

Finding cheap flights from Philadelphia to Denver International: Frequently asked questions

How much are return flights from Philadelphia to Denver International?

The best price we found for a return flight from Philadelphia to Denver International is 155 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Philadelphia to Denver International?

4 hours and 13 minutes is the average flight time from Philadelphia to Denver International.

Which airlines fly direct from Philadelphia to Denver International?

Southwest Airlines, American Airlines and United fly direct from Philadelphia to Denver International.

How many flights are there a week from Philadelphia to Denver International?

As of June 2026, there are 115 flights per week flying from Philadelphia to Denver International.

When is the cheapest time to fly from Philadelphia to Denver International?

The cheapest month to fly from Philadelphia to Denver International is usually August.

Which upcoming date is cheapest to fly from Philadelphia to Denver International Airport on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Philadelphia to Denver International Airport on Friday, 7 August 2026.

Can I get a direct flight from Philadelphia to Denver International Airport?

Yes – the average flight time is 4 hours and 13 minutes.

How can I find the best flight deal to Denver International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Denver?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Philadelphia to Denver International with?

The cheapest airline that flies to Denver International is Frontier Airlines .

Travelling from Philadelphia to Denver International Airport (DEN): What you need to know

Your boarding pass to adventure starts at Philadelphia's main airport, Philadelphia International Airport (PHL). Explore the options for reserving a flight from Philadelphia to Denver International Airport (DEN) departing from this terminal.
Around 4 hours 10 minutes is the typical travel time on a direct Philadelphia to Denver International Airport flight.
The timezone in Denver is UTC-7, which is two hours behind Philadelphia. Denver International Airport is located in Denver.
The busiest route is from Philadelphia International Airport (PHL) to Denver International Airport (DEN), with 49 direct weekly services. If you want to be on your way right away, the earliest flight from PHL to DEN is the 5am Southwest Airlines option. If you're looking to take off later, the final departure is at 9pm with American Airlines.
Arrive at the airport on time so you don't miss your flight from Philadelphia to DEN. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid sprinting to your gate.
July is a busy month for travelling. If you're heading away then or during a major holiday like July Fourth, show up even earlier. Aim for at least two hours ahead for domestic flights and up to four hours for international journeys.

Airports in Philadelphia

Philadelphia International Airport (PHL)

Enjoy an uninterrupted journey from Philadelphia International Airport (PHL). Nonstop flights from Philadelphia to Denver International Airport (DEN) operate from here.
Pick from a variety of carriers that operate direct flights from Philadelphia to Denver International Airport departing from PHL. Reserve your trip with one of these:
United sees the most traveller bookings for flights from PHL to DEN.
The carrier with the top on-time arrival performance on this route is United.
The journey from central Philadelphia to PHL takes around 30 minutes on public transport. If you ride-share, drive or get a taxi, you'll cover the 18 kilometres in 20 minutes or so, depending on traffic.
Searching for a convenient hotel close to Philadelphia International Airport? If you're catching an early flight from Philadelphia to Denver International Airport, these stays will have you sleeping moments from your departure lounge:
77% of flights that depart Philadelphia International Airport touch down at their destination on schedule.
PHL's address is 8500 Essington Ave.

Trenton-Mercer Airport (TTN)

You can reach TTN from central Philadelphia in approximately 40 minutes by car, depending on traffic conditions. The journey by public transport will take roughly 1 hour 35 minutes to cover the 48 kilometres or so.
Get a head start on your holiday with an extra night away from home. Before your Philadelphia to DEN flight, stay in one of these hotels near Trenton-Mercer Airport:
When it comes to keeping flights on track, Trenton-Mercer Airport has an on-time arrival rate of 76%.
The street address for TTN is Scotch Road, Terminal Building.

About Denver International Airport (DEN)

Arriving on a late flight from Philadelphia to Denver International Airport? Don't let it end in exhaustion. Stay a short drive from DEN at Baymont by Wyndham Denver International Airport.
To secure the lowest price, book your vehicle around one week ahead of your Philadelphia to Denver International Airport flight.
DEN is located at 8500 Pena Boulevard.

Getting from Denver International Airport (DEN) to central Denver

From Denver International Airport, central Denver is around 40 kilometres away. It takes about 35 minutes to reach the city centre by car.
It takes around 35 minutes if you're travelling on public transport.

How to find the cheapest flights from Philadelphia to Denver International Airport (DEN)

The cheapest price we've found for a one-way ticket from Philadelphia to Denver International Airport is 41 €. For a return flight on this route, the best price is 155 €. Depending on the availability when you book, these fares may change.
Booking in advance is often the key to scoring a cheap flight from Philadelphia to DEN. Airlines adjust prices based on demand, so the closer your departure date, the more expensive your ticket may be.
The 'Whole month' tool will show you the cheapest Philadelphia to Denver International Airport tickets across each month. It's a great way to find a bargain if your travel plans are flexible.
Spend less time searching for cheap plane tickets from Philadelphia to DEN by creating a Price Alert. We'll send you an email or push notification on the app when a lower fare pops up.
Save money on your flight from Philadelphia to Denver International Airport by using filters. Choose your ideal times, number of stops and airlines, then sort the results by 'Cheapest' for the best deals.

The best time to fly from Philadelphia to Denver International Airport (DEN)

It's time to decide when to book your flight from Philadelphia to Denver International Airport (DEN). July is when most people travel to Denver. If you prefer a quieter vibe, think about going in December.
The warmest month in Denver is July, with temperatures ranging between 14ºC (57ºF) and 32ºC (90ºF). Lock in your Philadelphia to DEN plane ticket then if you enjoy this type of weather.
January sees temperatures of between -9ºC (16ºF) and 7ºC (45ºF). Look for cheap tickets from Philadelphia to Denver International Airport around that time if you want to travel in cooler conditions.

More about Denver

When it comes to looking for somewhere to lay your head, you'll find the most popular stays in Denver right here. Browse these options once you've locked in your flight from Philadelphia to Denver International Airport:
You'll find plenty of exciting things to do in Denver when you're ready to see the sights. Kick off your exploring at Denver Art Museum followed by Meow Wolf Denver's Convergence Station and Ballpark.

Explore more of the United States

You've visited Denver, now it's time to discover more of the United States. Travel around 113 kilometres south to Colorado Springs to check off its must-visit sights. From Garden of the Gods to Pikes Peak Region Attractions and Red Rock Canyon, there's plenty to keep you busy.
If you're ready to explore another side of the United States, head for Pueblo, roughly 177 kilometres south of Denver. Rosemount Museum, Cathedral of the Sacred Heart and Sangre de Cristo Arts & Conference Centre are highlights.