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

Return flights

08 Dec - 12 Dec	Aeromexico
01 Dec - 07 Dec	Iberia
01 Dec - 10 Dec	Viva
02 Dec - 12 Dec	Aeromexico
15 Dec - 30 Dec	Aeromexico
03 Dec - 14 Dec	Volaris
03 Dec - 17 Dec	Viva
11 Dec - 22 Dec	Aeromexico
17 Dec - 30 Dec	Aeromexico
19 Dec - 07 Jan	Aeromexico
11 Dec - 20 Dec	Viva
23 Dec - 01 Jan	Aeromexico
28 Dec - 05 Jan	Volaris
20 Dec - 06 Jan	Viva
22 Dec - 02 Jan	Volaris
20 Dec - 04 Jan	Volaris
27 Dec - 04 Jan	Volaris
29 Dec - 04 Jan	Aeromexico

Also check the deals for one-way flights from Mexico City to Keflavik 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 Keflavik in December from 831€

Return flights