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

Return flights

13 Sep - 20 Sep	Fly Play	direct
15 Sep - 18 Sep	Fly Play	direct
09 Sep - 16 Sep	Fly Play	direct
10 Sep - 17 Sep	Fly Play	direct
09 Sep - 17 Sep	Fly Play	direct
29 Sep - 13 Oct	Fly Play	direct
10 Sep - 11 Sep	Fly Play	direct
29 Sep - 02 Oct	Fly Play	direct
13 Sep - 17 Sep	Fly Play	direct
11 Sep - 18 Sep	Fly Play	direct
16 Sep - 19 Sep	Fly Play	direct
25 Sep - 26 Sep	Fly Play	direct
30 Sep - 05 Oct	Norwegian
27 Sep - 06 Oct	Fly Play	direct
27 Sep - 04 Oct	Fly Play	direct
30 Sep - 05 Oct	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Amsterdam 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 Keflavik to Amsterdam in September from $202

Return flights