Frontier Airlines is selling cheap flights from Denver to Philadelphia for as low as $51 return! That works out to a cost of just 1.6 Cents Per Mile for this 3100 mile journey.
The fare only includes a small carry-on bag placed under the seat, and you need to pay extra if you want to use the overhead storage or to check bags.
Our data shows the lowest prices are available in November 2020. See the link(s) below for dates and prices.
Sample date(s) with Skyscanner.com booking link
We post many cheap flights like this one from Denver to Philadelphia every single day, so have a look at our Travel Deals page, or check out the related posts below!
Note: Prices are valid at the time of publishing this post, but may change in the future.
COVID-19 Note: During these uncertain times, please make sure to check the relevant Coronavirus restrictions for your destination before you book and before you fly. We recommend also checking the refund policy of the airline, as well as purchasing travel insurance for your trip.