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

Return flights

31 Dec - 14 Jan	British Airways	direct
02 Dec - 09 Dec	British Airways
12 Dec - 19 Dec	British Airways
07 Dec - 14 Dec	British Airways
10 Dec - 21 Dec	Delta
28 Dec - 11 Jan	Air Canada
03 Dec - 07 Dec	Air Canada
15 Dec - 07 Jan	Air Canada
17 Dec - 24 Dec	British Airways	direct
15 Dec - 07 Jan	Finnair	direct
22 Dec - 05 Jan	Air Canada
19 Dec - 05 Jan	Air Canada
20 Dec - 03 Jan	Air Canada
18 Dec - 04 Jan	Air Canada
22 Dec - 05 Jan	Finnair	direct
20 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 472€

Return flights