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

Return flights

25 Dec - 11 Jan	Frontier Airlines
31 Dec - 09 Jan	Frontier Airlines
24 Dec - 11 Jan	Frontier Airlines
25 Dec - 08 Jan	Frontier Airlines
31 Dec - 08 Jan	Frontier Airlines
30 Dec - 08 Jan	Spirit Airlines
29 Dec - 10 Jan	jetBlue
30 Dec - 09 Jan	Delta	direct
29 Dec - 10 Jan	Delta	direct
28 Dec - 07 Jan	jetBlue
25 Dec - 28 Dec	jetBlue
25 Dec - 30 Dec	Frontier Airlines
26 Dec - 29 Dec	jetBlue
26 Dec - 29 Dec	Finnair	direct
25 Dec - 28 Dec	British Airways	direct
27 Dec - 29 Dec	Air Canada
25 Dec - 30 Dec	Virgin Atlantic	direct
27 Dec - 29 Dec	Delta	direct

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 $723

Return flights