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

Return flights

25 Sep - 02 Oct	easyJet
01 Sep - 04 Sep	Eurowings
18 Sep - 30 Sep	Scandinavian Airlines
15 Sep - 16 Sep	Transavia France
10 Sep - 17 Sep	easyJet
10 Sep - 14 Sep	easyJet
25 Sep - 07 Oct	ITA Airways
04 Sep - 10 Sep	Discover Airlines	direct
27 Sep - 04 Oct	Scandinavian Airlines
22 Sep - 07 Oct	Transavia France
02 Sep - 10 Sep	LOT
01 Sep - 10 Sep	LOT
04 Sep - 11 Sep	easyJet
15 Sep - 23 Sep	Transavia France
27 Sep - 01 Oct	Lufthansa
25 Sep - 02 Oct	Icelandair	direct
26 Sep - 05 Oct	airBaltic
28 Sep - 04 Oct	Lufthansa
26 Sep - 07 Oct	Scandinavian Airlines
25 Sep - 07 Oct	Icelandair	direct

Also check the deals for one-way flights from Munich 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 Munich to Keflavik in September from $315

Return flights