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

Return flights

01 Dec - 08 Dec	British Airways
02 Dec - 23 Dec	Delta
08 Dec - 14 Dec	British Airways
08 Dec - 15 Dec	British Airways	direct
06 Dec - 12 Dec	jetBlue
04 Dec - 11 Dec	British Airways
12 Dec - 10 Jan	jetBlue
15 Dec - 18 Dec	jetBlue
24 Dec - 17 Jan	British Airways
13 Dec - 10 Jan	jetBlue
06 Dec - 13 Dec	British Airways	direct
06 Dec - 27 Dec	British Airways	direct
28 Dec - 09 Jan	Air Canada
12 Dec - 29 Dec	jetBlue
30 Dec - 05 Jan	jetBlue
13 Dec - 05 Jan	Spirit Airlines
18 Dec - 09 Jan	Air France
12 Dec - 04 Jan	jetBlue
12 Dec - 02 Jan	jetBlue
24 Dec - 17 Jan	British Airways	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 $594

Return flights