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

Return flights

17 Sep - 23 Sep	Lufthansa
13 Sep - 17 Sep	Ryanair
13 Sep - 21 Oct	Lufthansa
25 Sep - 04 Oct	Lufthansa
06 Sep - 18 Sep	Wizz Air UK
16 Sep - 23 Sep	Lufthansa
25 Sep - 02 Oct	Lufthansa
09 Sep - 18 Sep	Ryanair
25 Sep - 05 Oct	Lufthansa
30 Sep - 03 Oct	Norwegian Air Sweden AOC
16 Sep - 21 Sep	Wizz Air UK
25 Sep - 29 Sep	Lufthansa
11 Sep - 18 Sep	Ryanair
28 Sep - 05 Oct	Fly Play	direct
24 Sep - 01 Oct	Ryanair
28 Sep - 02 Oct	Fly Play	direct
27 Sep - 01 Oct	Wizz Air UK
18 Sep - 24 Sep	easyJet
19 Sep - 23 Sep	Norwegian Air Sweden AOC
29 Sep - 03 Oct	Transavia France

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 176€

Return flights