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

Return flights

10 Dec - 17 Dec	Air Canada
02 Dec - 09 Dec	Iberia
05 Dec - 12 Dec	Iberia
08 Dec - 15 Dec	Iberia
11 Dec - 18 Dec	Iberia
23 Dec - 17 Jan	Air Canada
12 Dec - 19 Dec	British Airways
24 Dec - 09 Jan	British Airways
25 Dec - 09 Jan	British Airways
20 Dec - 19 Jan	Spirit Airlines
14 Dec - 21 Dec	Iberia
17 Dec - 24 Dec	Iberia
23 Dec - 30 Dec	Iberia
18 Dec - 05 Jan	British Airways
28 Dec - 04 Jan	Iberia
26 Dec - 04 Jan	KLM

Also check the deals for one-way flights from Austin to Madrid 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 Madrid in December from $449

Return flights