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

Return flights

29 Aug - 04 Sep	Icelandair	direct
12 Aug - 19 Aug	Icelandair	direct
09 Aug - 18 Aug	SWISS
08 Aug - 17 Aug	SWISS
05 Aug - 13 Aug	Lufthansa
08 Aug - 16 Aug	SWISS
08 Aug - 14 Aug	SWISS
06 Aug - 15 Aug	SWISS
08 Aug - 17 Aug	Icelandair	direct
08 Aug - 14 Aug	Icelandair	direct
08 Aug - 16 Aug	Icelandair	direct

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 407€

Return flights