AirHint found the following cheapest return flights from Pittsburgh (PIT) to London (LHR) in December 2025 (see full year).

Return flights

29 Dec - 01 Jan	jetBlue
31 Dec - 07 Jan	Southern Airways Express
29 Dec - 02 Jan	jetBlue
31 Dec - 03 Jan	jetBlue
30 Dec - 04 Jan	Allegiant Air
27 Dec - 02 Jan	jetBlue
27 Dec - 03 Jan	jetBlue
27 Dec - 04 Jan	Allegiant Air
31 Dec - 07 Jan	British Airways	direct
27 Dec - 30 Dec	Delta
27 Dec - 03 Jan	Finnair	direct

Also check the deals for one-way flights from Pittsburgh to London in December.

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 Pittsburgh to London in December from 1042€

Return flights