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

Return flights

20 Sep - 01 Oct	Lufthansa
27 Sep - 07 Oct	SWISS
17 Sep - 23 Sep	Finnair
24 Sep - 30 Sep	Finnair
26 Sep - 30 Sep	Finnair
29 Sep - 05 Oct	Lufthansa
11 Sep - 14 Sep	Finnair
17 Sep - 24 Sep	Finnair
11 Sep - 18 Sep	Finnair
05 Sep - 18 Sep	Finnair
20 Sep - 29 Sep	Lufthansa
28 Sep - 07 Oct	Finnair
28 Sep - 06 Oct	Finnair
03 Sep - 16 Sep	Finnair
20 Sep - 04 Oct	SWISS
06 Sep - 19 Sep	Finnair
27 Sep - 06 Oct	Lufthansa
17 Sep - 07 Oct	Lufthansa
19 Sep - 02 Oct	Lufthansa

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 $722

Return flights