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

Return flights

22 Sep - 06 Oct	Volaris
19 Sep - 26 Sep	Volaris
27 Sep - 05 Oct	Aeromexico
15 Sep - 24 Sep	Viva
18 Sep - 09 Oct	Arajet
20 Sep - 01 Oct	Aeromexico
22 Sep - 01 Oct	Volaris
19 Sep - 25 Sep	Volaris
15 Sep - 20 Sep	Viva
11 Sep - 19 Sep	Volaris
20 Sep - 25 Sep	Volaris
08 Sep - 18 Sep	Volaris
19 Sep - 22 Sep	Volaris
08 Sep - 16 Sep	Volaris
23 Sep - 04 Oct	Viva
13 Sep - 23 Sep	Volaris
27 Sep - 18 Oct	Delta

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 538€

Return flights