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

Return flights

01 Sep - 08 Sep	Virgin Atlantic	direct
02 Sep - 09 Sep	Icelandair	direct
14 Sep - 21 Sep	Icelandair	direct
15 Sep - 22 Sep	Icelandair	direct
10 Sep - 17 Sep	Air Canada
10 Sep - 17 Sep	Icelandair	direct
13 Sep - 20 Sep	Air Canada
26 Sep - 01 Oct	Icelandair	direct
16 Sep - 16 Oct	Icelandair	direct
07 Sep - 14 Sep	Air Canada
09 Sep - 18 Sep	Delta	direct
07 Sep - 14 Sep	Icelandair	direct
26 Sep - 06 Oct	Air France	direct
29 Sep - 05 Oct	Air France	direct
26 Sep - 05 Oct	Air France	direct
28 Sep - 04 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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Cheapest return flights from New York to Keflavik in September from 310€

Return flights