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

Return flights

30 Jun - 08 Jul	Fly Play	direct
30 Jun - 03 Jul	Fly Play	direct
26 Jun - 30 Jun	Air Canada
28 Jun - 10 Jul	SWISS
28 Jun - 05 Jul	SWISS
29 Jun - 06 Jul	SWISS
26 Jun - 29 Jun	Air Canada
28 Jun - 06 Jul	SWISS
27 Jun - 04 Jul	United
27 Jun - 03 Jul	United
27 Jun - 01 Jul	United
29 Jun - 01 Jul	United
27 Jun - 28 Jun	Icelandair	direct
26 Jun - 30 Jun	Icelandair	direct
26 Jun - 29 Jun	Fly Play	direct

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

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 June from $411

Return flights