Cheapest return flights from Philadelphia to London in September from 587€

Best time to book flights for Philadelphia (PHL) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Philadelphia (PHL) to London (LHR) in September 2025 (see full year).

Return flights

02 Sep - 09 Sep jetBlue
10 Sep - 18 Sep Aer Lingus
15 Sep - 23 Sep Aer Lingus
28 Sep - 05 Oct United
27 Sep - 04 Oct Aer Lingus
15 Sep - 23 Sep British Airways direct
10 Sep - 18 Sep Iberia direct
27 Sep - 04 Oct British Airways direct
08 Sep - 15 Sep United
18 Sep - 25 Sep United
08 Sep - 14 Sep Delta

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

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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