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

Return flights

11 Sep - 16 Sep	Wizz Air
11 Sep - 18 Sep	Lufthansa
02 Sep - 04 Sep	Lufthansa
09 Sep - 16 Sep	Fly Play
09 Sep - 12 Sep	Fly Play
14 Sep - 22 Sep	Fly Play
04 Sep - 12 Sep	Fly Play	direct
09 Sep - 12 Sep	Fly Play	direct
09 Sep - 15 Sep	Fly Play
02 Sep - 04 Sep	Fly Play	direct

Also check the deals for one-way flights from Keflavik to Split 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.

Book a cheap hotel in Split

Cheap car rent in Split

Cheapest return flights from Keflavik to Split in September from $311

Return flights