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

Return flights

16 Aug - 23 Aug	Aer Lingus
20 Aug - 23 Aug	easyJet
19 Aug - 23 Aug	Aer Lingus
28 Aug - 31 Aug	easyJet
13 Aug - 17 Aug	Aer Lingus
08 Aug - 10 Aug	easyJet
04 Aug - 10 Aug	easyJet
01 Aug - 08 Aug	Aer Lingus
01 Aug - 04 Aug	Aer Lingus
02 Aug - 08 Aug	Aer Lingus

Also check the deals for one-way flights from Belfast 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 Belfast to Keflavik in August from $349

Return flights