AirHint found the following cheapest return flights from Mexico City (MEX) to Keflavik (KEF) in September 2026 (see full year).

Return flights

19 Sep - 02 Oct	Air France
01 Sep - 15 Sep	Delta
12 Sep - 26 Sep	Delta
17 Sep - 24 Sep	Air France
03 Sep - 13 Sep	KLM
12 Sep - 24 Sep	Air France
29 Sep - 08 Oct	Air Canada
28 Sep - 19 Oct	Air Canada
04 Sep - 14 Sep	Delta
18 Sep - 03 Oct	Virgin Atlantic
13 Sep - 26 Sep	Virgin Atlantic
28 Sep - 09 Oct	Air Canada
13 Sep - 27 Sep	Air Canada
18 Sep - 27 Sep	Air Canada
18 Sep - 25 Sep	Air Canada

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 $882

Return flights