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

Return flights

01 Sep - 08 Sep	Icelandair	direct
03 Sep - 10 Sep	Icelandair	direct
28 Sep - 05 Oct	Icelandair	direct
05 Sep - 13 Sep	Spirit Airlines
04 Sep - 11 Sep	Spirit Airlines
08 Sep - 16 Sep	Spirit Airlines
06 Sep - 13 Sep	Spirit Airlines
03 Sep - 11 Sep	jetBlue
04 Sep - 12 Sep	Air Canada
05 Sep - 12 Sep	Air Canada
07 Sep - 15 Sep	Air Canada
10 Sep - 04 Oct	Spirit Airlines

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 328€

Return flights