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

Return flights

25 Sep - 06 Oct	LOT
17 Sep - 23 Sep	Lufthansa
16 Sep - 22 Sep	LOT
25 Sep - 05 Oct	LOT
17 Sep - 26 Sep	Lufthansa
02 Sep - 08 Sep	LOT
20 Sep - 24 Sep	LOT
11 Sep - 22 Sep	LOT
09 Sep - 19 Sep	LOT
08 Sep - 15 Sep	Lufthansa
16 Sep - 23 Sep	Lufthansa
23 Sep - 29 Sep	LOT
24 Sep - 02 Oct	Lufthansa
23 Sep - 02 Oct	SWISS
24 Sep - 05 Oct	Lufthansa
26 Sep - 05 Oct	Lufthansa
24 Sep - 04 Oct	Lufthansa
17 Sep - 03 Oct	Finnair
18 Sep - 07 Oct	Lufthansa
28 Sep - 07 Oct	Finnair

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 555€

Return flights