AirHint found the following cheapest return flights from Frankfurt (FRA) to Keflavik (KEF) in May 2026 (see full year).

Return flights

05 May - 12 May	Ryanair
08 May - 20 May	Ryanair
11 May - 19 May	easyJet
20 May - 02 Jun	ITA Airways
13 May - 27 May	Ryanair
25 May - 04 Jun	easyJet
21 May - 05 Jun	LOT
09 May - 16 May	Ryanair
11 May - 02 Jun	Scandinavian Airlines
23 May - 06 Jun	LOT
02 May - 16 May	Lufthansa
02 May - 10 May	LOT
02 May - 09 May	Lufthansa	direct
02 May - 11 May	Lufthansa	direct
28 May - 06 Jun	Icelandair	direct
13 May - 20 May	Scandinavian Airlines
25 May - 05 Jun	ITA Airways
30 May - 06 Jun	Icelandair	direct
23 May - 06 Jun	Icelandair	direct
11 May - 02 Jun	Icelandair	direct

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

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 Frankfurt to Keflavik in May from 223€

Return flights