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

Return flights

08 Dec - 15 Dec	easyJet
06 Dec - 21 Dec	easyJet
08 Dec - 24 Dec	Wizz Air Malta
10 Dec - 17 Dec	easyJet
06 Dec - 22 Dec	Wizz Air
07 Dec - 08 Dec	Icelandair
29 Dec - 18 Jan	Wizz Air Malta
29 Dec - 19 Jan	Wizz Air Malta
27 Dec - 18 Jan	Icelandair
27 Dec - 19 Jan	Icelandair
12 Dec - 25 Dec	Wizz Air
26 Dec - 18 Jan	easyJet
12 Dec - 31 Dec	Wizz Air
12 Dec - 28 Dec	Wizz Air
12 Dec - 26 Dec	Wizz Air
20 Dec - 29 Jan	easyJet

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 713€

Return flights