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

Return flights

18 Sep - 23 Sep	Lufthansa
16 Sep - 23 Sep	Lufthansa
13 Sep - 21 Oct	Lufthansa
28 Sep - 30 Sep	Austrian Airlines
13 Sep - 18 Sep	Lufthansa
25 Sep - 05 Oct	Fly Play	direct
25 Sep - 28 Sep	Fly Play	direct
18 Sep - 28 Sep	Fly Play	direct
25 Sep - 30 Sep	Lufthansa
25 Sep - 02 Oct	Fly Play	direct
04 Sep - 08 Sep	Lufthansa
11 Sep - 18 Sep	Lufthansa
25 Sep - 29 Sep	Scandinavian Airlines
30 Sep - 03 Oct	Lufthansa
25 Sep - 01 Oct	easyJet
14 Sep - 22 Oct	Austrian Airlines
27 Sep - 02 Oct	Lufthansa
29 Sep - 03 Oct	Transavia France
25 Sep - 09 Oct	Fly Play	direct
26 Sep - 01 Oct	Austrian Airlines

Also check the deals for one-way flights from Prague 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 Prague to Keflavik in September from 153€

Return flights