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

Return flights

31 Dec - 13 Jan	Copa
11 Dec - 14 Dec	Avianca	direct
04 Dec - 08 Dec	Avianca	direct
06 Dec - 14 Dec	Avianca	direct
02 Dec - 09 Dec	Avianca	direct
09 Dec - 01 Jan	Avianca	direct
08 Dec - 18 Dec	Avianca	direct
24 Dec - 31 Dec	Avianca	direct
24 Dec - 28 Dec	Avianca	direct
05 Dec - 09 Dec	Avianca	direct
15 Dec - 22 Dec	Volaris Costa Rica
15 Dec - 22 Dec	Aeromexico	direct
03 Dec - 01 Jan	Avianca	direct
28 Dec - 07 Jan	Aeromexico	direct
25 Dec - 12 Jan	Avianca	direct
13 Dec - 19 Jan	Avianca	direct
22 Dec - 18 Jan	Avianca
26 Dec - 12 Jan	Avianca
23 Dec - 18 Jan	Viva
24 Dec - 06 Jan	Avianca	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 $258

Return flights