Cheapest one-way flights from Philadelphia to London in May from $241

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

AirHint found the following cheapest one-way flights from Philadelphia (PHL) to London (LHR) in May 2025 (see full year).

One-Way flights

03 May Frontier Airlines
14 May jetBlue
17 May jetBlue
25 May Frontier Airlines
08 May Iberia direct
22 May Frontier Airlines
03 May British Airways direct
11 May British Airways direct
05 May British Airways direct
18 May American Airlines direct

Also check the deals for return flights from Philadelphia to London in May.

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