Cheapest return flights from Philadelphia to London in August from 744€

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 August 2025 (see full year).

Return flights

17 Aug - 01 Sep Finnair
17 Aug - 01 Sep Finnair direct
05 Aug - 21 Aug Finnair
05 Aug - 21 Aug Finnair direct
15 Aug - 22 Aug United
13 Aug - 18 Aug Finnair
15 Aug - 18 Aug Finnair
13 Aug - 18 Aug Finnair direct
15 Aug - 18 Aug Finnair direct

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

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.

Book a cheap hotel in London

Cheap car rent in London