Cheapest return flights from Boston to Keflavik in September from $315

Best time to book flights for Boston (BOS) to Keflavik (KEF) flights at AirHint

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

Return flights

11 Sep - 15 Sep Fly Play direct
27 Sep - 06 Oct Fly Play direct
20 Sep - 04 Oct Fly Play direct
27 Sep - 04 Oct Fly Play direct
10 Sep - 14 Sep Icelandair direct
05 Sep - 15 Sep Fly Play direct
25 Sep - 28 Sep Icelandair direct
11 Sep - 14 Sep Icelandair direct
21 Sep - 28 Sep Icelandair direct
04 Sep - 12 Sep Fly Play direct
06 Sep - 13 Sep Icelandair direct

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

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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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