Cheapest return flights from Philadelphia to London in September from $735

AirHint found the following cheapest return flights from Philadelphia (PHL) to London (LHR) in September 2026 (see full year).

Return flights

28 Sep - 31 Oct Scandinavian Airlines
03 Sep - 07 Sep jetBlue
01 Sep - 07 Sep Finnair
04 Sep - 12 Sep jetBlue
03 Sep - 13 Sep Aer Lingus
28 Sep - 31 Oct British Airways direct
04 Sep - 12 Sep British Airways direct
03 Sep - 04 Sep jetBlue
03 Sep - 07 Sep Finnair direct
03 Sep - 04 Sep Iberia direct

Also check the deals for one-way flights from Philadelphia to London in September.

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