AirHint found the following cheapest return flights from Singapore (SIN) to Keflavik (KEF) in May 2026 (see full year).

Return flights

05 May - 19 May	Qatar Airways
13 May - 20 May	Turkish Airlines
26 May - 01 Jun	Malaysia Airlines
23 May - 06 Jun	Etihad Airways
30 May - 12 Jun	Gulf Air
11 May - 21 May	Lufthansa
26 May - 02 Jun	Lufthansa
26 May - 09 Jun	Lufthansa
16 May - 23 May	Lufthansa
21 May - 31 May	KLM
28 May - 06 Jun	Lufthansa
27 May - 07 Jun	KLM
05 May - 11 May	British Airways
27 May - 06 Jun	British Airways
27 May - 24 Jun	British Airways
25 May - 31 May	British Airways
26 May - 07 Jun	British Airways
22 May - 31 May	Finnair
15 May - 22 May	Finnair
26 May - 31 May	Finnair

Also check the deals for one-way flights from Singapore to Keflavik in May.

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 May from $780

Return flights