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

Return flights

13 Sep - 21 Oct	Lufthansa
23 Sep - 30 Sep	Lufthansa
13 Sep - 21 Sep	Lufthansa
11 Sep - 21 Sep	Lufthansa
13 Sep - 18 Sep	Lufthansa
16 Sep - 22 Sep	Wizz Air UK
16 Sep - 24 Sep	easyJet
11 Sep - 16 Sep	Lufthansa
10 Sep - 21 Sep	SWISS
24 Sep - 01 Oct	Ryanair
23 Sep - 04 Oct	Wizz Air UK
18 Sep - 22 Sep	easyJet
10 Sep - 16 Sep	SWISS
24 Sep - 05 Oct	Ryanair
23 Sep - 02 Oct	Wizz Air UK
30 Sep - 04 Oct	Lufthansa
25 Sep - 02 Oct	Wizz Air UK
29 Sep - 05 Oct	Smart Wings
20 Sep - 10 Oct	Ryanair
29 Sep - 06 Oct	Ryanair

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 157€

Return flights