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

Return flights

16 Dec - 22 Dec	Lufthansa
14 Dec - 29 Dec	Spirit Airlines
27 Dec - 05 Jan	Spirit Airlines
07 Dec - 29 Dec	Delta
17 Dec - 28 Dec	Lufthansa
27 Dec - 04 Jan	Spirit Airlines
25 Dec - 04 Jan	Spirit Airlines
09 Dec - 20 Dec	KLM
23 Dec - 28 Dec	Finnair
30 Dec - 06 Jan	Aer Lingus
18 Dec - 01 Jan	Delta
19 Dec - 29 Dec	Frontier Airlines
18 Dec - 30 Dec	Delta
19 Dec - 28 Dec	Spirit Airlines
18 Dec - 02 Jan	Frontier Airlines
20 Dec - 03 Jan	Frontier Airlines
26 Dec - 02 Jan	Aer Lingus
19 Dec - 27 Dec	American Airlines

Also check the deals for one-way flights from Austin 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 Austin to Dublin in December from 830€

Return flights