Route guide · 1,554 miles
Cheap Flights from Denver to Philadelphia
DEN → PHL · Nonstop 3h 40m · Live round-trip fares
If Philadelphia is next on your list, here's the honest picture on fares from Denver. The trip covers about 1,554 miles and takes roughly 3h 40m in the air. Prices on this route reward planners: booking 3–6 weeks ahead is the sweet spot, and the lowest fares tend to sell out fast.
Live fares for DEN → PHL are updating. Use the search below for real-time prices.
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Updated daily
Flight time
3h 40m
Nonstop, typical
Distance
1,554 mi
DEN → PHL
Book ahead
3–6 weeks
Best window, typically
Nonstop airlines
3
American Airlines, United Airlines & more
Nonstop flights from Denver to Philadelphia
Nonstop flights from Denver to Philadelphia are flown by American Airlines, United Airlines, Southwest Airlines. The 1,554-mile trip takes about 3h 40m gate to gate, and nonstops are usually cheapest when booked 3–6 weeks ahead.
Booking insights: Denver → Philadelphia
- Distance: 1,554 miles · nonstop flight time: 3h 40m.
- Cheapest upcoming week in the live data starts around Oct 15, with fares from $203.
- Fares tend to bottom out when you book about 3–6 weeks ahead — earlier than that rarely helps, later usually hurts.
- Tuesday and Wednesday departures usually undercut Friday and Sunday fares on routes like this one.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
Cheapest month · Denver → Philadelphia
October 2026
Every date's recent round-trip fare, at a glance.
Fares from
$203
Cheapest: Thu, Oct 15 — $203
Get this fare →Recent fares found for specific dates in October 2026. Blank days had no recent fare in our data — ask our team and we'll check them for you.
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Flying from Denver to Philadelphia: what you need to know
The flight
At 1,554 miles, this is a long domestic flight — about 3h 40m gate to gate on a nonstop. It deserves a bit of planning: eat before you board or buy early (popular items sell out), and pick your seat with the flight length in mind.
Airlines on this route
American Airlines, United Airlines and Southwest Airlines fly this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Denver (DEN)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Denver airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Philadelphia (PHL)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Philadelphia airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Philadelphia to Denver fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 1,554 miles, booking 3–6 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 3h 40m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- Flexible dates? Search a few days either side — one day can change the fare a lot.
Denver to Philadelphia flight FAQs
How long is the flight from DEN to PHL?
Nonstop flights from Denver to Philadelphia take about 3h 40m and cover roughly 1,554 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from Denver to Philadelphia?
American Airlines, United Airlines, Southwest Airlines typically operate nonstop flights from DEN to PHL. Nonstops are usually cheapest when booked 3–6 weeks ahead of departure.
What is the cheapest month to fly from Denver to Philadelphia?
There's no single magic month, but prices on this route generally soften in the shoulder season, when demand dips after the holidays and again in early fall. A free fare alert is the easiest way to catch those windows.
How much are last minute flights from DEN to PHL?
Book inside the final week and you'll usually pay a premium on DEN to PHL. Fares booked 3–6 weeks ahead are almost always kinder.
What is a good round-trip deal from Denver to Philadelphia?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Denver to Philadelphia?
You'll mainly see American Airlines, United Airlines, Southwest Airlines on Denver to Philadelphia. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to Denver airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
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