Cheapest return flights from Newark to Keflavik in September from $402

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

22 Sep - 01 Oct KLM
20 Sep - 01 Oct KLM
27 Sep - 08 Oct KLM
14 Sep - 25 Sep Icelandair direct
13 Sep - 24 Sep KLM
03 Sep - 12 Sep KLM
20 Sep - 29 Sep KLM
06 Sep - 10 Sep Icelandair direct
15 Sep - 25 Sep Icelandair direct
23 Sep - 02 Oct Icelandair direct
01 Sep - 10 Sep Delta
04 Sep - 10 Sep Delta
22 Sep - 01 Oct Icelandair direct
20 Sep - 01 Oct Icelandair direct
27 Sep - 08 Oct Icelandair direct
28 Sep - 16 Oct Icelandair direct
25 Sep - 02 Oct Icelandair direct
28 Sep - 03 Oct Icelandair direct
10 Sep - 19 Sep Icelandair direct
17 Sep - 26 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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik