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

Return flights

23 Sep - 01 Oct	Viva
22 Sep - 06 Oct	Aeromexico
23 Sep - 03 Oct	Viva
08 Sep - 17 Sep	Viva
15 Sep - 24 Sep	Aeromexico
15 Sep - 22 Sep	Aeromexico
08 Sep - 22 Sep	Viva
03 Sep - 18 Sep	Viva
03 Sep - 10 Sep	Viva
17 Sep - 24 Sep	Viva
08 Sep - 18 Sep	Viva
01 Sep - 10 Sep	Aeromexico
20 Sep - 01 Oct	Volaris
18 Sep - 25 Sep	Aeromexico
22 Sep - 02 Oct	Aeromexico
26 Sep - 03 Oct	Emirates

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

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 September from 576€

Return flights