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

Return flights

29 Dec - 14 Jan	Delta
25 Dec - 17 Jan	British Airways
23 Dec - 17 Jan	Frontier Airlines
06 Dec - 27 Dec	KLM
07 Dec - 27 Dec	Frontier Airlines
22 Dec - 08 Jan	Frontier Airlines
21 Dec - 10 Jan	Frontier Airlines
24 Dec - 31 Dec	Spirit Airlines
23 Dec - 27 Dec	jetBlue
10 Dec - 03 Jan	Frontier Airlines
23 Dec - 29 Dec	Spirit Airlines
19 Dec - 07 Jan	Spirit Airlines
16 Dec - 04 Jan	Spirit Airlines
20 Dec - 05 Jan	Frontier Airlines
22 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Austin to Barcelona 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 Barcelona in December from 474€

Return flights