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

Return flights

22 Jul - 31 Jul	easyJet
22 Jul - 25 Jul	easyJet
30 Jul - 20 Aug	Ryanair
24 Jul - 01 Aug	Condor
30 Jul - 21 Aug	Ryanair
22 Jul - 29 Jul	easyJet
26 Jul - 31 Jul	easyJet
27 Jul - 29 Jul	Lufthansa
21 Jul - 28 Jul	easyJet
21 Jul - 01 Aug	easyJet
29 Jul - 07 Aug	Ryanair
31 Jul - 10 Aug	Lufthansa
21 Jul - 23 Jul	easyJet
21 Jul - 30 Jul	easyJet
30 Jul - 06 Aug	Ryanair
30 Jul - 13 Aug	Ryanair
31 Jul - 12 Aug	Lufthansa
25 Jul - 05 Aug	Lufthansa
23 Jul - 30 Jul	Ryanair
23 Jul - 27 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 $404

Return flights