Cheapest return flights from Boston to Keflavik in September from 298€

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

Return flights

29 Sep - 07 Oct Delta
30 Sep - 06 Oct KLM
23 Sep - 13 Oct KLM
21 Sep - 02 Oct Delta
29 Sep - 07 Oct Icelandair direct
30 Sep - 06 Oct Icelandair direct
21 Sep - 02 Oct Icelandair direct
22 Sep - 01 Oct Icelandair direct
22 Sep - 30 Sep Icelandair direct
23 Sep - 29 Sep Icelandair direct
22 Sep - 29 Sep Icelandair direct
23 Sep - 30 Sep Icelandair direct
24 Sep - 29 Sep Icelandair direct
30 Sep - 05 Oct Icelandair direct
19 Sep - 23 Sep United
19 Sep - 24 Sep Air Canada
27 Sep - 04 Oct Icelandair direct
23 Sep - 27 Sep Icelandair direct
20 Sep - 27 Sep Icelandair direct
21 Sep - 23 Sep Air France

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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