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

Return flights

08 Dec - 15 Dec	Spirit Airlines
03 Dec - 06 Dec	Spirit Airlines
03 Dec - 10 Dec	Spirit Airlines
03 Dec - 16 Dec	Spirit Airlines
02 Dec - 06 Dec	Spirit Airlines
02 Dec - 10 Dec	Spirit Airlines
16 Dec - 30 Dec	Spirit Airlines
28 Dec - 09 Jan	Spirit Airlines
29 Dec - 12 Jan	Spirit Airlines
20 Dec - 01 Jan	jetBlue
19 Dec - 01 Jan	jetBlue
20 Dec - 03 Jan	jetBlue
22 Dec - 29 Dec	Spirit Airlines
19 Dec - 02 Jan	jetBlue
21 Dec - 02 Jan	jetBlue
14 Dec - 20 Dec	Spirit Airlines
19 Dec - 04 Jan	Spirit Airlines
20 Dec - 10 Jan	Air France
23 Dec - 04 Jan	Spirit Airlines
20 Dec - 26 Dec	Air France

Also check the deals for one-way flights from Atlanta 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 Atlanta to London in December from 471€

Return flights