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

Return flights

10 Sep - 13 Sep	Brussels Airlines	direct
10 Sep - 15 Sep	Brussels Airlines	direct
10 Sep - 18 Sep	Air France	direct
07 Sep - 17 Sep	Brussels Airlines	direct
04 Sep - 12 Sep	United
04 Sep - 11 Sep	United
03 Sep - 08 Sep	United
05 Sep - 16 Sep	Air France
05 Sep - 18 Sep	Air France
04 Sep - 08 Sep	KLM
25 Sep - 03 Oct	United
25 Sep - 03 Oct	Icelandair	direct
28 Sep - 08 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 346€

Return flights