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

Return flights

12 Sep - 20 Sep	Spirit Airlines
07 Sep - 14 Sep	Spirit Airlines
14 Sep - 22 Sep	Spirit Airlines
01 Sep - 08 Sep	Spirit Airlines
01 Sep - 08 Sep	Icelandair	direct
07 Sep - 14 Sep	Icelandair	direct
14 Sep - 22 Sep	Icelandair	direct
19 Sep - 26 Sep	Icelandair	direct
17 Sep - 26 Sep	Icelandair	direct
05 Sep - 10 Sep	Icelandair	direct

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

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 Nashville to Keflavik in September from $420

Return flights