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

Return flights

10 Jan - 17 Jan	Icelandair	direct
22 Jan - 28 Jan	Icelandair	direct
16 Jan - 30 Jan	Icelandair	direct
13 Jan - 27 Jan	Icelandair	direct
17 Jan - 25 Jan	Icelandair	direct
09 Jan - 16 Jan	Icelandair	direct
14 Jan - 21 Jan	Icelandair	direct
24 Jan - 31 Jan	Icelandair	direct
04 Jan - 11 Jan	Icelandair	direct
17 Jan - 24 Jan	Icelandair	direct

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

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 January from $348

Return flights