Cheapest return ATL–KEF flights, September

AirHint found the following cheapest return flights from Atlanta (ATL) to Keflavik (KEF) in September 2026 (see full year).

Return flights

02 Sep - 09 Sep Frontier Airlines
02 Sep - 10 Sep Frontier Airlines
10 Sep - 14 Sep Frontier Airlines
01 Sep - 09 Sep Frontier Airlines
12 Sep - 19 Sep Frontier Airlines
13 Sep - 20 Sep Frontier Airlines
29 Sep - 06 Oct Icelandair
28 Sep - 05 Oct Frontier Airlines
06 Sep - 11 Sep Frontier Airlines
11 Sep - 30 Sep Frontier Airlines
05 Sep - 12 Sep Frontier Airlines
17 Sep - 21 Sep Icelandair

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

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