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

Return flights

09 Sep - 17 Sep	Lufthansa
10 Sep - 17 Sep	Lufthansa
09 Sep - 25 Sep	Lufthansa
10 Sep - 16 Sep	Lufthansa
02 Sep - 09 Sep	Air Canada
09 Sep - 15 Sep	Lufthansa
05 Sep - 18 Sep	Lufthansa
09 Sep - 14 Sep	Lufthansa
10 Sep - 14 Sep	Lufthansa
21 Sep - 28 Sep	Air Canada
29 Sep - 11 Oct	Air Canada
26 Sep - 03 Oct	United
29 Sep - 06 Oct	United
08 Sep - 10 Oct	United
08 Sep - 10 Oct	Air France	direct
29 Sep - 06 Oct	British Airways	direct
29 Sep - 11 Oct	Air France	direct
20 Sep - 02 Oct	British Airways

Also check the deals for one-way flights from Atlanta to London in September.

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 September from 399€

Return flights