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

Return flights

17 Sep - 23 Sep	Wizz Air Malta
25 Sep - 02 Oct	Wizz Air Malta
16 Sep - 25 Sep	Wizz Air Malta
16 Sep - 23 Sep	Wizz Air Malta
27 Sep - 02 Oct	Wizz Air Malta
23 Sep - 27 Sep	Wizz Air Malta
16 Sep - 20 Sep	Wizz Air Malta
24 Sep - 28 Sep	Wizz Air Malta
26 Sep - 01 Oct	Ryanair
04 Sep - 08 Sep	Wizz Air Malta
11 Sep - 18 Sep	Wizz Air Malta
25 Sep - 28 Sep	Wizz Air Malta
02 Sep - 16 Sep	Wizz Air Malta

Also check the deals for one-way flights from Bucharest 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 Bucharest to Keflavik in September from $218

Return flights