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

Return flights

30 Jun - 08 Jul	Spirit Airlines
17 Jun - 23 Jun	Frontier Airlines
21 Jun - 27 Jun	Frontier Airlines
20 Jun - 24 Jun	Spirit Airlines
17 Jun - 24 Jun	Spirit Airlines
26 Jun - 02 Jul	Spirit Airlines
20 Jun - 27 Jun	Frontier Airlines
27 Jun - 05 Jul	Spirit Airlines
19 Jun - 26 Jun	Spirit Airlines
19 Jun - 27 Jun	Frontier Airlines
23 Jun - 07 Jul	WestJet
24 Jun - 30 Jun	Spirit Airlines
27 Jun - 03 Jul	Spirit Airlines
22 Jun - 30 Jun	Spirit Airlines
26 Jun - 31 Jul	Icelandair

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

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 Keflavik in June from $568

Return flights