Cheapest return flights from Boston to Keflavik in December from $352

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 December 2025 (see full year).

Return flights

29 Dec - 07 Jan Fly Play direct
30 Dec - 07 Jan Fly Play direct
06 Dec - 13 Dec Icelandair direct
07 Dec - 14 Dec Icelandair direct
11 Dec - 18 Dec Icelandair direct
29 Dec - 03 Jan Fly Play direct
08 Dec - 15 Dec Fly Play direct
09 Dec - 16 Dec Fly Play direct
10 Dec - 17 Dec Fly Play direct
23 Dec - 30 Dec Fly Play direct
27 Dec - 03 Jan Fly Play direct
26 Dec - 31 Dec Fly Play direct

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

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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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