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

Return flights

25 Sep - 02 Oct	Lufthansa
13 Sep - 20 Sep	IndiGo
23 Sep - 30 Sep	Finnair
14 Sep - 21 Sep	Lufthansa
24 Sep - 01 Oct	Finnair
15 Sep - 22 Sep	Lufthansa
22 Sep - 29 Sep	SWISS
30 Sep - 09 Oct	Air India
28 Sep - 05 Oct	Finnair
26 Sep - 30 Sep	Finnair
20 Sep - 30 Sep	SWISS
18 Sep - 07 Oct	Lufthansa
29 Sep - 04 Oct	Air India
26 Sep - 05 Oct	Lufthansa
17 Sep - 08 Oct	KLM
15 Sep - 26 Sep	Lufthansa
26 Sep - 06 Oct	Lufthansa
30 Sep - 11 Oct	SWISS

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 615€

Return flights