$54 Cheap Frontier Airlines flights Philadelphia (PHL) to Denver (DEN)

Make use of the “Price (lowest to highest)” filter on Expedia to look for cheap Frontier Airlines round-trip flights from $152 from PHL to DEN. Affordable one-way options from $54 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines flights to Denver are typically more affordable in the low-season months of January and November. Whether you need a one-way or round-trip ticket, you could find a better deal then.

Search for affordable Frontier Airlines flights from Philadelphia Intl. Airport (PHL) to Denver Intl. Airport (DEN) one to three months before your departure date. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and journey, the best day to book a domestic flight is usually Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Frontier Airlines operates direct flights from Philadelphia Intl. Airport (PHL) to Denver Intl. Airport (DEN), with 2 departures every week. Simply select the “Nonstop” and “Airline” filters while searching on Expedia to find all direct Frontier Airlines flights to DEN.

On average, it takes 4h 31m to travel nonstop from Philadelphia Intl. Airport (PHL) to Denver Intl. Airport (DEN) with Frontier Airlines.

Jetting off from PHL at 9:53PM UTC-5, the earliest Frontier Airlines flight to DEN arrives at 12:24AM UTC-7. Traveling earlier in the day means you’ll be less likely to encounter delays or cancellations.* After something later? The last Frontier Airlines flight from PHL to DEN departs at 9:53PM UTC-5 and touches down at 12:24AM UTC-7.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Jump on a Frontier Airlines flight from Philadelphia Intl. Airport (PHL) to Denver, and you’ll likely touch down at Denver Intl. Airport (DEN). This is the airline’s primary hub in this city.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to leave from PHL to DEN with Frontier Airlines. Plus, when you join our One Key™ program, you can earn OneKeyCash™* on top of Frontier Airlines’s loyalty program earnings. It’s yours to use wherever your next trip takes you.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

For the Philadelphia Intl. Airport (PHL) to Denver Intl. Airport (DEN) route, Frontier Airlines typically uses Airbus A320neo and Airbus A321neo planes. Don’t forget that last-minute changes can occur for operational demands, meaning your flight could be on a different aircraft.

Changes are often free within 24 hours of making your booking, but your airline may add a charge after that. For more information about altering your reservation, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to make changes without extra charges, apply the “Changes included” or “No cancel fee” filter when organizing your trip.