Cheapest return flights from Boston to Keflavik in September from $300

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

Return flights

27 Sep - 05 Oct Icelandair direct
24 Sep - 01 Oct Icelandair direct
30 Sep - 07 Oct Icelandair direct
12 Sep - 17 Sep Icelandair direct
23 Sep - 30 Sep Icelandair direct
04 Sep - 11 Sep Icelandair direct
25 Sep - 29 Sep Icelandair direct
13 Sep - 20 Sep Icelandair direct
08 Sep - 15 Sep Icelandair direct
25 Sep - 28 Sep Icelandair direct
03 Sep - 10 Sep Icelandair direct
12 Sep - 20 Sep Icelandair direct
11 Sep - 16 Sep Icelandair direct
27 Sep - 04 Oct Icelandair direct
25 Sep - 04 Oct Icelandair direct
27 Sep - 10 Oct Icelandair direct

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

Skyscanner

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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