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

Return flights

28 Jul - 04 Aug	jetBlue
25 Jul - 03 Aug	Spirit Airlines
16 Jul - 23 Jul	jetBlue
07 Jul - 14 Jul	Spirit Airlines
16 Jul - 19 Jul	jetBlue
10 Jul - 17 Jul	Spirit Airlines
03 Jul - 10 Jul	Spirit Airlines
20 Jul - 26 Jul	WestJet
09 Jul - 13 Jul	Spirit Airlines
07 Jul - 13 Jul	Spirit Airlines
01 Jul - 08 Jul	Air France
08 Jul - 15 Jul	KLM
28 Jul - 04 Aug	Icelandair	direct
30 Jul - 03 Aug	Icelandair	direct
25 Jul - 03 Aug	Icelandair	direct

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

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 July from $509

Return flights