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

Return flights

03 Dec - 10 Dec	United
08 Dec - 15 Dec	Iberia
23 Dec - 30 Dec	Delta
18 Dec - 25 Dec	Iberia
20 Dec - 18 Jan	Iberia
13 Dec - 20 Dec	Iberia
20 Dec - 12 Jan	Frontier Airlines
20 Dec - 11 Jan	Frontier Airlines
28 Dec - 04 Jan	Iberia
20 Dec - 05 Jan	Frontier Airlines
20 Dec - 06 Jan	Iberia
22 Dec - 03 Jan	Spirit Airlines
20 Dec - 04 Jan	Frontier Airlines
20 Dec - 03 Jan	Iberia
19 Dec - 03 Jan	Spirit Airlines

Also check the deals for one-way flights from San Antonio 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 San Antonio to Madrid in December from 494€

Return flights