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

Return flights

12 Dec - 10 Jan	Spirit Airlines
13 Dec - 10 Jan	Allegiant Air
01 Dec - 08 Dec	Southern Airways Express
06 Dec - 12 Dec	Spirit Airlines
08 Dec - 14 Dec	Spirit Airlines
24 Dec - 17 Jan	Air Canada
13 Dec - 05 Jan	Allegiant Air
12 Dec - 29 Dec	Spirit Airlines
15 Dec - 18 Dec	Spirit Airlines
06 Dec - 27 Dec	Spirit Airlines
18 Dec - 09 Jan	jetBlue
12 Dec - 04 Jan	Spirit Airlines
13 Dec - 03 Jan	Allegiant Air
30 Dec - 05 Jan	Southern Airways Express
12 Dec - 03 Jan	Spirit Airlines
27 Dec - 05 Jan	Allegiant Air
10 Dec - 21 Dec	Turkish Airlines
24 Dec - 30 Dec	jetBlue
24 Dec - 31 Dec	jetBlue

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 $579

Return flights