AirHint found the following cheapest return flights from Philadelphia (PHL) to London (LHR) in January 2026 (see full year).

Return flights

19 Jan - 29 Jan	Air Canada
14 Jan - 21 Jan	British Airways	direct
28 Jan - 06 Feb	British Airways	direct
05 Jan - 19 Jan	Air Canada
11 Jan - 19 Jan	Air Canada
05 Jan - 12 Jan	Air Canada
07 Jan - 31 Jan	Lufthansa
22 Jan - 07 Feb	Scandinavian Airlines
06 Jan - 31 Jan	Air Canada
28 Jan - 04 Feb	British Airways
16 Jan - 22 Jan	jetBlue
17 Jan - 21 Jan	jetBlue
15 Jan - 24 Jan	jetBlue
12 Jan - 07 Feb	jetBlue
12 Jan - 07 Feb	Iberia	direct
22 Jan - 07 Feb	British Airways	direct

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

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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Cheapest return flights from Philadelphia to London in January from $582

Return flights