Cheapest return flights from Philadelphia to London in May from $570

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

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

Return flights

13 May - 16 May Frontier Airlines
19 May - 23 May Spirit Airlines
06 May - 09 May Spirit Airlines
13 May - 30 May Frontier Airlines
03 May - 10 May Spirit Airlines
19 May - 31 May Frontier Airlines
13 May - 20 May Frontier Airlines
05 May - 14 May Spirit Airlines
13 May - 17 May Spirit Airlines
14 May - 17 May Spirit Airlines
30 May - 09 Jun British Airways
31 May - 08 Jun TAP
30 May - 08 Jun TAP
29 May - 04 Jun TAP

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

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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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