Cheapest return flights from Atlanta to Keflavik in September from $337

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

Return flights

20 Sep - 23 Sep Spirit Airlines
09 Sep - 23 Sep Spirit Airlines
13 Sep - 23 Sep Spirit Airlines
16 Sep - 23 Sep Spirit Airlines
10 Sep - 18 Sep Spirit Airlines
13 Sep - 18 Sep Spirit Airlines
15 Sep - 23 Sep Spirit Airlines
08 Sep - 18 Sep Spirit Airlines
11 Sep - 18 Sep Spirit Airlines
15 Sep - 18 Sep Spirit Airlines
23 Sep - 01 Oct Spirit Airlines
17 Sep - 01 Oct Spirit Airlines
21 Sep - 01 Oct Spirit Airlines
23 Sep - 07 Oct Spirit Airlines
26 Sep - 01 Oct Spirit Airlines
27 Sep - 02 Oct Spirit Airlines
27 Sep - 07 Oct Spirit Airlines
28 Sep - 01 Oct Spirit Airlines
30 Sep - 07 Oct Spirit Airlines
30 Sep - 08 Oct Spirit Airlines

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

Skyscanner

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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