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
11 Dec - 30 Dec	easyJet
11 Dec - 31 Dec	easyJet
12 Dec - 31 Dec	Wizz Air
22 Dec - 11 Jan	Wizz Air
12 Dec - 26 Dec	Wizz Air
12 Dec - 04 Jan	Wizz Air
11 Dec - 01 Jan	easyJet
12 Dec - 01 Jan	Wizz Air
11 Dec - 02 Jan	easyJet
11 Dec - 03 Jan	easyJet
20 Dec - 29 Jan	Transavia France
17 Dec - 04 Jan	easyJet
22 Dec - 05 Jan	Wizz Air
19 Dec - 06 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 $935

Return flights