Cheapest return flights from Boston to Keflavik in September from $236

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

Return flights

05 Sep - 11 Sep Fly Play direct
03 Sep - 10 Sep Fly Play direct
06 Sep - 08 Sep Fly Play direct
05 Sep - 08 Sep Fly Play direct
01 Sep - 08 Sep Fly Play direct
01 Sep - 05 Sep Fly Play direct
17 Sep - 01 Oct Icelandair direct
27 Sep - 07 Oct Icelandair direct
28 Sep - 08 Oct Icelandair direct
16 Sep - 07 Oct Icelandair direct
17 Sep - 08 Oct Icelandair direct
07 Sep - 05 Oct Icelandair direct
15 Sep - 11 Oct Icelandair direct
27 Sep - 05 Oct Icelandair direct
09 Sep - 23 Sep Icelandair direct
10 Sep - 24 Sep Icelandair direct
16 Sep - 30 Sep Icelandair direct
02 Sep - 16 Sep Icelandair direct
25 Sep - 05 Oct Icelandair direct
25 Sep - 06 Oct 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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