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

Return flights

26 May - 09 Jun	Icelandair	direct
23 May - 06 Jun	Icelandair	direct
22 May - 29 May	Icelandair	direct
20 May - 27 May	Icelandair	direct
16 May - 23 May	Icelandair	direct
04 May - 11 May	Icelandair	direct

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

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 May from $431

Return flights