Cheapest return flights from Frankfurt to Keflavik in September from $208

Best time to book flights for Frankfurt (FRA) to Keflavik (KEF) flights at AirHint

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

Return flights

28 Sep - 02 Oct Ryanair
18 Sep - 02 Oct Ryanair
24 Sep - 08 Oct Ryanair
11 Sep - 17 Sep Ryanair
17 Sep - 02 Oct Ryanair
04 Sep - 07 Sep Ryanair
01 Sep - 14 Sep Ryanair
10 Sep - 12 Sep Ryanair
11 Sep - 15 Sep Ryanair
12 Sep - 14 Sep Ryanair
18 Sep - 22 Sep Ryanair
08 Sep - 10 Sep Ryanair
01 Sep - 07 Sep Ryanair
17 Sep - 28 Sep Ryanair
15 Sep - 02 Oct Ryanair
27 Sep - 11 Oct Ryanair
26 Sep - 10 Oct Ryanair
24 Sep - 04 Oct Ryanair
27 Sep - 06 Oct Ryanair
20 Sep - 04 Oct Ryanair

Also check the deals for one-way flights from Frankfurt to Keflavik in September.

Skyscanner

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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