Cheapest return flights from Newark to Keflavik in September from $387

Best time to book flights for Newark (EWR) to Keflavik (KEF) flights at AirHint

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

Return flights

29 Sep - 06 Oct Air Canada
03 Sep - 10 Sep Air Canada
01 Sep - 10 Sep Icelandair direct
28 Sep - 12 Oct Icelandair direct
15 Sep - 26 Sep Icelandair direct
16 Sep - 01 Oct Icelandair direct
20 Sep - 26 Sep Icelandair direct
29 Sep - 06 Oct Icelandair direct
14 Sep - 21 Sep Icelandair direct
23 Sep - 30 Sep Icelandair direct
17 Sep - 24 Sep Icelandair direct
03 Sep - 10 Sep Icelandair direct
10 Sep - 17 Sep Icelandair direct
05 Sep - 10 Sep Icelandair direct

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

Skyscanner

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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