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

Return flights

04 Dec - 11 Dec	Avianca
09 Dec - 09 Jan	Avianca
15 Dec - 29 Dec	Avianca	direct
10 Dec - 12 Jan	Avianca
04 Dec - 08 Dec	Avianca
20 Dec - 26 Dec	Avianca	direct
15 Dec - 22 Dec	Avianca	direct
14 Dec - 21 Dec	Avianca
14 Dec - 21 Dec	Aeromexico	direct
10 Dec - 12 Jan	Aeromexico	direct
21 Dec - 04 Jan	Avianca
30 Dec - 06 Jan	Avianca	direct
12 Dec - 06 Jan	Avianca
26 Dec - 31 Dec	Avianca	direct
26 Dec - 01 Jan	Avianca	direct
26 Dec - 02 Jan	Copa
12 Dec - 06 Jan	Aeromexico	direct
09 Dec - 09 Jan	Aeromexico	direct

Also check the deals for one-way flights from Mexico City 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 Mexico City to San Salvador in December from $235

Return flights