AirHint found the following cheapest return flights from Delhi (DEL) to Keflavik (KEF) in September 2025 (see full year).

Return flights

23 Sep - 01 Oct	LOT
02 Sep - 10 Sep	LOT
04 Sep - 10 Sep	LOT
25 Sep - 02 Oct	Lufthansa
08 Sep - 15 Sep	Lufthansa
03 Sep - 16 Sep	SWISS
15 Sep - 26 Sep	Lufthansa
01 Sep - 15 Sep	Lufthansa
17 Sep - 30 Sep	Finnair
10 Sep - 17 Sep	Finnair
16 Sep - 23 Sep	Finnair
05 Sep - 12 Sep	Finnair
20 Sep - 02 Oct	Lufthansa
20 Sep - 01 Oct	Finnair
26 Sep - 05 Oct	Lufthansa
27 Sep - 03 Oct	Lufthansa
27 Sep - 06 Oct	Lufthansa
22 Sep - 01 Oct	KLM

Also check the deals for one-way flights from Delhi to Keflavik in September.

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 Delhi to Keflavik in September from $703

Return flights