AirHint found the following cheapest return flights from Keflavik (KEF) to Bangkok (BKK) in December 2025 (see full year).

Return flights

08 Dec - 24 Dec	Wizz Air
29 Dec - 11 Jan	easyJet
08 Dec - 05 Jan	Wizz Air
10 Dec - 05 Jan	Wizz Air
09 Dec - 06 Jan	Wizz Air
09 Dec - 05 Jan	Wizz Air
09 Dec - 07 Jan	Wizz Air
09 Dec - 08 Jan	Wizz Air
25 Dec - 17 Jan	easyJet
12 Dec - 26 Dec	Wizz Air
17 Dec - 14 Jan	Icelandair
17 Dec - 06 Jan	Icelandair
23 Dec - 30 Dec	Finnair

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

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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Cheapest return flights from Keflavik to Bangkok in December from $784

Return flights