AirHint found the following cheapest return flights from Boston (BOS) to Keflavik (KEF) in August 2026 (see full year).

Return flights

30 Aug - 07 Sep	Delta
19 Aug - 26 Aug	Icelandair	direct
30 Aug - 07 Sep	Icelandair	direct
13 Aug - 20 Aug	Icelandair	direct
12 Aug - 19 Aug	Icelandair	direct
04 Aug - 19 Aug	Icelandair	direct
09 Aug - 19 Aug	Scandinavian Airlines
08 Aug - 16 Aug	Lufthansa
09 Aug - 16 Aug	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Boston 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 Boston to Keflavik in August from 397€

Return flights