Cheapest return flights from Philadelphia to London in August from $650

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

27 Aug - 09 Sep Iberia
10 Aug - 19 Aug Iberia
08 Aug - 25 Aug Iberia direct
08 Aug - 25 Aug Aer Lingus
22 Aug - 29 Aug Aer Lingus
19 Aug - 02 Sep Iberia
05 Aug - 21 Aug Iberia
05 Aug - 21 Aug Iberia direct
12 Aug - 23 Aug Iberia direct
12 Aug - 18 Aug Iberia
22 Aug - 29 Aug Iberia direct
18 Aug - 01 Sep Finnair
27 Aug - 09 Sep British Airways direct
19 Aug - 02 Sep British Airways direct
19 Aug - 31 Aug Iberia
18 Aug - 01 Sep British Airways direct
29 Aug - 05 Sep Finnair
28 Aug - 06 Sep jetBlue
28 Aug - 04 Sep United
30 Aug - 13 Sep Air Canada

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.

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