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

Return flights

05 Dec - 26 Dec	Frontier Airlines
03 Dec - 09 Dec	Volaris
03 Dec - 09 Dec	United	direct
05 Dec - 26 Dec	United	direct
31 Dec - 09 Jan	United	direct
01 Dec - 03 Jan	Frontier Airlines
20 Dec - 03 Jan	Frontier Airlines
26 Dec - 05 Jan	Volaris
09 Dec - 05 Jan	Avianca
26 Dec - 03 Jan	Frontier Airlines
20 Dec - 06 Jan	Viva
09 Dec - 05 Jan	United	direct
19 Dec - 04 Jan	Frontier Airlines
23 Dec - 07 Jan	United	direct
04 Dec - 15 Dec	Avianca	direct
26 Dec - 29 Dec	Avianca	direct
07 Dec - 09 Dec	Avianca	direct
13 Dec - 17 Dec	Avianca	direct
19 Dec - 30 Dec	Avianca	direct
20 Dec - 28 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 $340

Return flights