Cheapest return flights from Boston to Keflavik in September from 229€

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

14 Sep - 17 Sep Fly Play direct
24 Sep - 08 Oct Fly Play direct
16 Sep - 07 Oct Fly Play direct
16 Sep - 08 Oct Fly Play direct
15 Sep - 07 Oct Fly Play direct
17 Sep - 07 Oct Fly Play direct
24 Sep - 07 Oct Fly Play direct
10 Sep - 17 Sep Fly Play direct
16 Sep - 30 Sep Fly Play direct
19 Sep - 10 Oct Fly Play direct
19 Sep - 07 Oct Fly Play direct
09 Sep - 16 Sep Fly Play direct
15 Sep - 22 Sep Fly Play direct
16 Sep - 23 Sep Fly Play direct
17 Sep - 24 Sep Fly Play direct
10 Sep - 23 Sep Fly Play direct
10 Sep - 24 Sep Fly Play direct
16 Sep - 24 Sep Fly Play direct
25 Sep - 01 Oct Fly Play direct
29 Sep - 07 Oct Fly Play 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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