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

Return flights

31 Dec - 10 Jan	Lufthansa
07 Dec - 14 Dec	Juneyao Airlines
31 Dec - 09 Jan	Lufthansa
11 Dec - 14 Dec	Scoot
27 Dec - 04 Jan	Hainan Airlines
25 Dec - 01 Jan	Scoot
08 Dec - 13 Dec	Lufthansa
06 Dec - 13 Dec	SWISS
06 Dec - 14 Dec	Finnair
28 Dec - 01 Jan	Finnair
18 Dec - 23 Dec	British Airways
01 Dec - 14 Dec	KLM
13 Dec - 30 Dec	SWISS
20 Dec - 28 Dec	British Airways
18 Dec - 30 Dec	British Airways
24 Dec - 04 Jan	KLM
20 Dec - 04 Jan	Finnair
23 Dec - 03 Jan	Lufthansa
25 Dec - 03 Jan	Lufthansa

Also check the deals for one-way flights from Singapore to Keflavik 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 Singapore to Keflavik in December from 736€

Return flights