AirHint found the following cheapest return flights from Nashville (BNA) to Dublin (DUB) in December 2025 (see full year).

Return flights

07 Dec - 16 Dec	Aer Lingus	direct
07 Dec - 14 Dec	Aer Lingus	direct
04 Dec - 11 Dec	Aer Lingus	direct
03 Dec - 11 Dec	Icelandair
04 Dec - 07 Dec	Aer Lingus	direct
12 Dec - 14 Dec	Icelandair
02 Dec - 08 Dec	Spirit Airlines
06 Dec - 14 Dec	Spirit Airlines
13 Dec - 18 Dec	Aer Lingus
04 Dec - 14 Dec	Aer Lingus	direct
31 Dec - 07 Jan	Aer Lingus
29 Dec - 06 Jan	Aer Lingus
29 Dec - 05 Jan	Aer Lingus
26 Dec - 02 Jan	Aer Lingus

Also check the deals for one-way flights from Nashville to Dublin in December.

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 Dublin in December from $487

Return flights