AirHint found the following cheapest return flights from Boston (BOS) to Keflavik (KEF) in October 2025 (see full year).

Return flights

19 Oct - 26 Oct	Icelandair	direct
23 Oct - 30 Oct	Icelandair	direct
17 Oct - 24 Oct	Icelandair	direct
20 Oct - 27 Oct	Icelandair	direct
21 Oct - 28 Oct	Icelandair	direct
22 Oct - 29 Oct	Icelandair	direct
24 Oct - 31 Oct	Icelandair	direct
02 Oct - 14 Oct	Icelandair	direct
01 Oct - 09 Oct	Icelandair	direct
01 Oct - 07 Oct	Icelandair	direct
23 Oct - 02 Nov	United
30 Oct - 04 Nov	United
23 Oct - 03 Nov	United
31 Oct - 08 Nov	United

Also check the deals for one-way flights from Boston to Keflavik in October.

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 October from 261€

Return flights