AirHint found the following cheapest return flights from Houston (HOU) to San Salvador (SAL) in December 2025 (see full year).

Return flights

11 Dec - 17 Dec	Avianca
11 Dec - 14 Jan	Avianca
11 Dec - 17 Dec	United	direct
24 Dec - 01 Jan	Viva Aerobus
30 Dec - 07 Jan	Volaris El Salvador
30 Dec - 07 Jan	United	direct
27 Dec - 02 Jan	Volaris
11 Dec - 14 Jan	United	direct
24 Dec - 02 Jan	Viva Aerobus
24 Dec - 14 Jan	Avianca	direct
22 Dec - 05 Jan	Viva Aerobus
24 Dec - 01 Jan	United	direct
25 Dec - 31 Dec	Avianca	direct
13 Dec - 30 Dec	Avianca	direct
11 Dec - 30 Dec	Avianca	direct
12 Dec - 30 Dec	Avianca	direct

Also check the deals for one-way flights from Houston to San Salvador 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 Houston to San Salvador in December from $387

Return flights