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

Return flights

30 Dec - 29 Jan	Frontier Airlines
29 Dec - 29 Jan	Frontier Airlines
27 Dec - 29 Jan	Frontier Airlines
25 Dec - 28 Jan	Frontier Airlines
31 Dec - 08 Jan	Frontier Airlines
29 Dec - 10 Jan	Frontier Airlines
31 Dec - 09 Jan	Air Canada
28 Dec - 10 Jan	Frontier Airlines
29 Dec - 06 Jan	Frontier Airlines
25 Dec - 08 Jan	Frontier Airlines
25 Dec - 28 Dec	Frontier Airlines
25 Dec - 30 Dec	Frontier Airlines
25 Dec - 31 Dec	Frontier Airlines
25 Dec - 26 Dec	Spirit Airlines
26 Dec - 27 Dec	Spirit Airlines

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 577€

Return flights