Cheap flights from Philadelphia International to Denver International from $80
Updated 2026-09-08
1554 miles great-circle distance, typically flown in 3h 32m with 7 airlines operating direct service from Philadelphia International (PHL) to Denver International (DEN). Fares on this corridor stay relatively stable across the year — booking 4–8 weeks ahead and choosing a midweek departure typically secures the best price.
Flying from Philadelphia International
Philadelphia International is American Airlines' largest East Coast hub after Charlotte. Six terminals A through F are connected airside, with SEPTA's Airport Line running from each terminal directly to 30th Street Station downtown in 25 minutes for $7.75. American operates the bulk of the schedule; Frontier and Spirit run heavy ULCC operations on leisure routes. Transatlantic service to Europe is dense — daily flights to London, Frankfurt, Madrid, Doha and Dublin make PHL the cheapest gateway for many small-city US travellers heading to Europe.
Arriving in Denver
Denver International is 25 miles northeast of downtown Denver — the most remote big-city airport in the US, deliberately sited to allow for unlimited expansion. The University of Colorado A Line commuter train runs from a dedicated station every 15 minutes to Union Station in 37 minutes for $10.50. Snow can disrupt operations from November through April; Denver fares are cheapest in shoulder seasons (April–May, September–October).
Who flies PHL to DEN?
| Airline | IATA | Flight time | Cabin |
| American Airlines | AA | 3h 32m | Economy |
| Frontier Airlines | F9 | 3h 32m | Economy |
| Spirit Airlines | NK | 3h 32m | Economy |
| Southwest Airlines | WN | 3h 32m | Economy |
| JetBlue Airways | B6 | 3h 32m | Economy |
| Delta Air Lines | DL | 3h 32m | Economy |
| United Airlines | UA | 3h 32m | Economy |
7 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Philadelphia to Denver FAQs
Direct flights from Philadelphia International (PHL) to Denver International (DEN) take approximately 3h 32m for the 1554-mile journey, plus 30–60 minutes of taxi, climb and descent. Total airport-to-airport time depends on cruise winds and air-traffic queueing on approach.
7 carriers operate direct service from Philadelphia International (PHL) to Denver International (DEN): American Airlines, Frontier Airlines, Spirit Airlines, Southwest Airlines, JetBlue Airways and 2 more. Frequencies vary by season and carrier — American Airlines typically operates the highest weekly count on this corridor.
No — United States is domestic travel for US citizens. A US passport is not required for the 50 states, DC or US territories (Puerto Rico, US Virgin Islands, Guam, American Samoa, Northern Mariana Islands), though Real ID-compliant ID is required at TSA from May 2025.
Denver International (DEN) is the primary international airport for Denver. Allow 30–60 minutes for the ground transfer by train, express bus, taxi or rideshare depending on traffic and time of day. See the airport's official website for current train and shuttle timetables.