Cheapest return flights from Atlanta to Keflavik in September from $615

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

Return flights

20 Sep - 05 Oct Frontier Airlines
30 Sep - 03 Oct Spirit Airlines
21 Sep - 28 Sep Frontier Airlines
22 Sep - 29 Sep Frontier 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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