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

Return flights

06 Jan - 13 Jan	British Airways
19 Jan - 30 Jan	British Airways
13 Jan - 27 Jan	British Airways
19 Jan - 30 Jan	Finnair	direct
13 Jan - 27 Jan	Finnair	direct
06 Jan - 13 Jan	Finnair	direct
08 Jan - 15 Jan	British Airways
23 Jan - 30 Jan	British Airways
16 Jan - 30 Jan	British Airways
16 Jan - 30 Jan	Finnair	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 438€

Return flights