Philadelphia (PHL) to Chicago (CHI): 676 miles (1,088 km) great-circle, about 1h 50m nonstop by our estimate. Cheapest fare observed: $167 round-trip on Frontier, with 1 stop, departing June 3, 2026.
$167 round-trip, Frontier F91003, departing 2026-06-03 at 16:25, returning 2026-06-08. The recorded itinerary left on a Wednesday, returning on a Monday 5 nights later; the fare was observed 39 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $167, it ranked 8th of the 30 round-trip fares we recorded from PHL (median $234). That is 24.7 cents per great-circle mile (round-trip price over one-way distance), above the PHL median of 21.3 cents across 30 round-trip routes.
Routes from PHL of similar length: Nashville (674 mi) at $165 and Atlanta (666 mi) at $188.
Frontier had the cheapest fare on 19 of 30 PHL routes. It is the 26th longest of the 30 routes we track from PHL.
Of 33 departure airports with a fare to Chicago, Philadelphia (PHL) ranked 12th at $167. Lowest: $89 from Atlanta (ATL); highest: $1241 from Nairobi (NBO); 16 nonstop. Cheapest-fare airlines (routes): Frontier (15), Spirit (5), United Airlines (4), American Airlines (2), airline 0O (1) and Alaska Airlines (1), plus 5 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/Chicago; flight time is our estimate.