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

Return flights

25 Sep - 30 Sep	Lufthansa
25 Sep - 01 Oct	easyJet
13 Sep - 21 Oct	Lufthansa
18 Sep - 25 Sep	Fly Play	direct
27 Sep - 03 Oct	Wizz Air UK
20 Sep - 30 Sep	Lufthansa
24 Sep - 16 Oct	Ryanair
25 Sep - 04 Oct	Lufthansa
24 Sep - 01 Oct	easyJet
25 Sep - 17 Oct	easyJet
30 Sep - 03 Oct	Wizz Air UK
11 Sep - 18 Sep	Lufthansa
28 Sep - 05 Oct	Fly Play	direct
28 Sep - 12 Oct	Fly Play	direct
11 Sep - 17 Sep	Lufthansa
13 Sep - 23 Sep	Lufthansa
06 Sep - 11 Sep	Lufthansa
03 Sep - 11 Sep	Ryanair
10 Sep - 17 Sep	SWISS
19 Sep - 23 Sep	Lufthansa

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 $193

Return flights