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

Return flights

17 Oct - 26 Oct	Viva
19 Oct - 26 Oct	Aeromexico
18 Oct - 25 Oct	Viva
19 Oct - 24 Oct	Aeromexico
17 Oct - 25 Oct	Viva
01 Oct - 15 Oct	Viva
05 Oct - 14 Oct	Viva
06 Oct - 13 Oct	Delta
24 Oct - 01 Nov	Volaris
14 Oct - 19 Oct	Viva
07 Oct - 13 Oct	Delta
31 Oct - 08 Nov	Viva
28 Oct - 04 Nov	Volaris

Also check the deals for one-way flights from Mexico City to Keflavik in October.

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 October from 586€

Return flights