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

Return flights

19 Jul - 25 Jul	SWISS
05 Jul - 12 Jul	SWISS
24 Jul - 01 Aug	SWISS
26 Jul - 02 Aug	SWISS
24 Jul - 28 Jul	SWISS
30 Jul - 06 Aug	Air Serbia
13 Jul - 19 Jul	Lufthansa
26 Jul - 03 Aug	SWISS
12 Jul - 19 Jul	SWISS
24 Jul - 30 Jul	SWISS
28 Jul - 31 Jul	SWISS
24 Jul - 29 Jul	SWISS
15 Jul - 22 Jul	Lufthansa
27 Jul - 03 Aug	Vueling Airlines
02 Jul - 10 Jul	SWISS
28 Jul - 04 Aug	SWISS
31 Jul - 14 Aug	Air Serbia

Also check the deals for one-way flights from Ljubljana 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 Ljubljana to Keflavik in July from $288

Return flights