AirHint found the following cheapest return flights from New York (NYC) to Keflavik (KEF) in September 2026 (see full year).

Return flights

20 Sep - 24 Sep	Icelandair	direct
07 Sep - 25 Sep	Icelandair	direct
13 Sep - 20 Sep	Icelandair	direct
07 Sep - 13 Sep	Icelandair	direct
05 Sep - 13 Sep	KLM	direct
06 Sep - 14 Sep	KLM	direct
08 Sep - 16 Sep	Air France	direct
09 Sep - 17 Sep	Air France	direct
10 Sep - 18 Sep	Air France	direct
13 Sep - 21 Sep	Air France	direct
27 Sep - 05 Oct	KLM	direct
24 Sep - 02 Oct	Air France	direct
29 Sep - 07 Oct	Air Canada
30 Sep - 06 Oct	United
25 Sep - 03 Oct	United
30 Sep - 08 Oct	United
23 Sep - 01 Oct	United
28 Sep - 06 Oct	Air Canada
23 Sep - 01 Oct	Icelandair	direct
25 Sep - 03 Oct	Icelandair	direct

Also check the deals for one-way flights from New York 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 New York to Keflavik in September from $398

Return flights