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

Return flights

31 Aug - 04 Sep	Fly Play	direct
31 Aug - 07 Sep	Fly Play	direct
17 Aug - 24 Aug	Fly Play	direct
11 Aug - 17 Aug	Fly Play	direct
03 Aug - 10 Aug	Fly Play	direct
04 Aug - 11 Aug	Fly Play	direct
04 Aug - 10 Aug	Fly Play	direct
18 Aug - 27 Aug	Icelandair	direct
05 Aug - 10 Aug	Scandinavian Airlines
06 Aug - 10 Aug	Scandinavian Airlines
07 Aug - 10 Aug	Scandinavian Airlines
06 Aug - 11 Aug	Icelandair	direct

Also check the deals for one-way flights from Billund to Keflavik 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 Billund to Keflavik in August from $236

Return flights