Cheapest return flights from Atlanta to Keflavik in September from $417

Best time to book flights for Atlanta (ATL) to Keflavik (KEF) flights at AirHint

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

Return flights

21 Sep - 28 Sep Spirit Airlines
16 Sep - 23 Sep Spirit Airlines
10 Sep - 17 Sep Spirit Airlines
09 Sep - 16 Sep Spirit Airlines
02 Sep - 09 Sep Spirit Airlines
11 Sep - 29 Sep Spirit Airlines
01 Sep - 08 Sep Spirit Airlines
22 Sep - 29 Sep Spirit Airlines
08 Sep - 29 Sep Spirit Airlines
14 Sep - 21 Sep Spirit Airlines
29 Sep - 06 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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