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

Return flights

29 Sep - 06 Oct	Icelandair	direct
10 Sep - 17 Sep	Air Canada
03 Sep - 10 Sep	Air Canada
04 Sep - 11 Sep	Air Canada
05 Sep - 12 Sep	Air Canada
06 Sep - 13 Sep	Air Canada
11 Sep - 18 Sep	Air Canada
13 Sep - 20 Sep	Air Canada
16 Sep - 23 Sep	Air Canada
11 Sep - 14 Sep	Air Canada
15 Sep - 22 Sep	Icelandair	direct
24 Sep - 01 Oct	Spirit Airlines
30 Sep - 07 Oct	Virgin Atlantic
27 Sep - 04 Oct	Spirit Airlines
28 Sep - 05 Oct	Delta
25 Sep - 02 Oct	Spirit Airlines
26 Sep - 03 Oct	Spirit Airlines
28 Sep - 05 Oct	Icelandair	direct
28 Sep - 02 Oct	Air France
29 Sep - 03 Oct	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 361€

Return flights