Los Angeles (LAX) to Philadelphia (PHL): 2,396 miles (3,856 km) great-circle, about 5h 20m nonstop by our estimate. Cheapest fare observed: $121 round-trip on Frontier, with 1 stop, departing June 1, 2026.
$121 round-trip, Frontier F93240, departing 2026-06-01 at 00:26, returning 2026-06-03. The recorded itinerary left on a Monday, returning on a Wednesday 2 nights later; the fare was observed 37 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $121, it ranked 2nd of the 30 round-trip fares we recorded from LAX (median $302). That is 5.0 cents per great-circle mile (round-trip price over one-way distance), below the LAX median of 15.3 cents across 30 round-trip routes.
Routes from LAX of similar length: Miami (2,338 mi) at $181 and New York (2,469 mi) at $137.
Frontier had the cheapest fare on 11 of 30 LAX routes. It is the 15th longest of the 30 routes we track from LAX.
Of 13 departure airports with a fare to Philadelphia, Los Angeles (LAX) ranked 3rd at $121. 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).
The reverse, Philadelphia (PHL) to Los Angeles (LAX), was $301 round-trip on Frontier, 1 stop, departing June 24, 2026. Philadelphia to Los Angeles flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, America/New_York; flight time is our estimate.