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

Return flights

01 Dec - 04 Dec	Scandinavian Airlines
06 Dec - 10 Dec	Scandinavian Airlines
10 Dec - 21 Dec	Lufthansa
05 Dec - 09 Dec	Air Canada
11 Dec - 15 Dec	Air Canada
04 Dec - 15 Dec	Air Canada
16 Dec - 25 Dec	United
08 Dec - 22 Dec	Lufthansa
11 Dec - 18 Dec	United
01 Dec - 08 Dec	British Airways	direct
31 Dec - 07 Jan	United
26 Dec - 09 Jan	Air Canada
31 Dec - 07 Jan	British Airways	direct
26 Dec - 09 Jan	Air France	direct
27 Dec - 03 Jan	Frontier Airlines
26 Dec - 02 Jan	Lufthansa
27 Dec - 03 Jan	Air France	direct
19 Dec - 05 Jan	Lufthansa
19 Dec - 05 Jan	Air France	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 286€

Return flights