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

Return flights

12 Sep - 14 Sep	Fly Play	direct
18 Sep - 22 Sep	Wizz Air UK
30 Sep - 14 Oct	Wizz Air UK
29 Sep - 06 Oct	Wizz Air UK
11 Sep - 14 Sep	Fly Play	direct
09 Sep - 16 Sep	Jet2
29 Sep - 09 Oct	Wizz Air UK
25 Sep - 29 Sep	Wizz Air UK
12 Sep - 15 Sep	Fly Play
29 Sep - 13 Oct	Wizz Air UK
19 Sep - 21 Sep	Wizz Air
12 Sep - 18 Sep	Fly Play
18 Sep - 25 Sep	Wizz Air UK
11 Sep - 18 Sep	Lufthansa
29 Sep - 13 Oct	Fly Play	direct
29 Sep - 06 Oct	Fly Play	direct
29 Sep - 03 Oct	Wizz Air
29 Sep - 09 Oct	Fly Play	direct

Also check the deals for one-way flights from Split 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 Split to Keflavik in September from $244

Return flights