AirHint found the following cheapest return flights from Keflavik (KEF) to Vienna (VIE) in August 2025 (see full year).

Return flights

28 Aug - 01 Sep	Fly Play
29 Aug - 02 Sep	Fly Play
22 Aug - 24 Aug	Fly Play
01 Aug - 05 Aug	Fly Play
15 Aug - 17 Aug	Fly Play
29 Aug - 02 Sep	Austrian Airlines	direct
15 Aug - 17 Aug	Austrian Airlines	direct

Also check the deals for one-way flights from Keflavik to Vienna in August.

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 Keflavik to Vienna in August from $306

Return flights