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

Return flights

26 Jul - 05 Aug	Aegean Airlines
31 Jul - 05 Aug	Lufthansa
31 Jul - 08 Aug	Lufthansa
31 Jul - 13 Aug	Lufthansa
27 Jul - 29 Jul	Condor
25 Jul - 31 Jul	Ryanair
26 Jul - 08 Aug	Aegean Airlines
28 Jul - 05 Aug	Condor
31 Jul - 12 Aug	Lufthansa
25 Jul - 04 Aug	Ryanair
30 Jul - 12 Aug	Ryanair
25 Jul - 28 Jul	Ryanair
27 Jul - 03 Aug	Condor
25 Jul - 29 Jul	Ryanair
27 Jul - 30 Jul	easyJet
26 Jul - 28 Jul	easyJet
27 Jul - 31 Jul	Condor
24 Jul - 28 Jul	easyJet
24 Jul - 27 Jul	Ryanair
24 Jul - 26 Jul	Ryanair

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

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 July from 378€

Return flights