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

Return flights

13 Jan - 27 Jan	American Airlines
28 Jan - 06 Feb	American Airlines
14 Jan - 20 Jan	American Airlines
11 Jan - 26 Jan	Air Canada
13 Jan - 27 Jan	British Airways	direct
14 Jan - 20 Jan	British Airways	direct
07 Jan - 14 Jan	British Airways	direct
27 Jan - 03 Feb	British Airways	direct
15 Jan - 21 Jan	American Airlines
16 Jan - 22 Jan	American Airlines
05 Jan - 11 Jan	American Airlines
15 Jan - 20 Jan	Air Canada
28 Jan - 06 Feb	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 $484

Return flights