Detroit (DTW) to Philadelphia (PHL): 452 miles (728 km) great-circle, about 1h 25m nonstop by our estimate. Cheapest fare observed: $156 round-trip on Frontier, with 1 stop, departing May 19, 2026.
$156 round-trip, Frontier F94286, departing 2026-05-19 at 12:54, returning 2026-05-22. The recorded itinerary left on a Tuesday, returning on a Friday 3 nights later; the fare was observed 24 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $156, it ranked 7th of the 30 round-trip fares we recorded from DTW (median $275). That is 34.5 cents per great-circle mile (round-trip price over one-way distance), above the DTW median of 22.2 cents across 30 round-trip routes.
Routes from DTW of similar length: Baltimore (408 mi) at $148 and New York (508 mi) at $162.
Frontier had the cheapest fare on 17 of 30 DTW routes. It is the 27th longest of the 30 routes we track from DTW.
Of 13 departure airports with a fare to Philadelphia, Detroit (DTW) ranked 8th at $156. Lowest: $69 from Tampa (TPA); highest: $413 from Punta Cana (PUJ); 5 nonstop. Cheapest-fare airlines (routes): Frontier (10), Southwest (1), Spirit (1) and Sun Country (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/New_York; flight time is our estimate.