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

Return flights

13 Aug - 20 Aug	Air Canada
10 Aug - 20 Aug	Air Canada
11 Aug - 23 Aug	Air Canada
28 Aug - 19 Sep	Icelandair	direct
01 Aug - 13 Aug	Air Canada
04 Aug - 15 Aug	Air Canada
01 Aug - 22 Aug	Air Canada
15 Aug - 05 Sep	Icelandair	direct
05 Aug - 15 Aug	Air Canada
01 Aug - 15 Aug	Air Canada
03 Aug - 29 Aug	United
01 Aug - 12 Aug	Air Canada

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 449€

Return flights