Cheapest return flights from Philadelphia to London in May from $595

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 May 2025 (see full year).

Return flights

27 May - 03 Jun Delta
26 May - 09 Jun KLM
29 May - 03 Jun Delta
11 May - 18 May jetBlue
16 May - 02 Jun jetBlue
15 May - 19 May Delta
30 May - 02 Jun Delta
16 May - 26 May Delta
24 May - 14 Jun Virgin Atlantic
11 May - 21 May KLM
11 May - 17 May jetBlue
11 May - 20 May jetBlue
14 May - 21 May jetBlue
24 May - 02 Jun jetBlue
26 May - 02 Jun jetBlue
11 May - 25 May jetBlue
13 May - 23 May jetBlue
27 May - 15 Jun jetBlue
11 May - 21 May Finnair direct
28 May - 08 Jun jetBlue

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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