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

Return flights

25 Sep - 02 Oct	Wizz Air Malta
13 Sep - 17 Sep	Air Europa
25 Sep - 28 Sep	Wizz Air Malta
17 Sep - 24 Sep	Wizz Air Malta
25 Sep - 03 Oct	KLM
22 Sep - 28 Sep	Vueling Airlines
11 Sep - 14 Sep	Wizz Air Malta
20 Sep - 29 Sep	Wizz Air Malta
13 Sep - 20 Sep	Air Europa
28 Sep - 30 Sep	Ryanair
20 Sep - 27 Sep	Wizz Air Malta
14 Sep - 20 Sep	Wizz Air Malta
26 Sep - 05 Oct	easyJet

Also check the deals for one-way flights from Valencia 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 Valencia to Keflavik in September from $284

Return flights