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

Return flights

23 Sep - 29 Sep	Delta
11 Sep - 15 Sep	Delta
04 Sep - 15 Sep	Delta
04 Sep - 12 Sep	Delta
04 Sep - 08 Sep	Delta
06 Sep - 20 Sep	Air Canada
09 Sep - 18 Sep	Air Canada
11 Sep - 18 Sep	Air Canada
05 Sep - 15 Sep	Air Canada
06 Sep - 13 Sep	Air Canada
18 Sep - 02 Oct	Air Canada
30 Sep - 07 Oct	KLM
27 Sep - 02 Oct	Air Canada
09 Sep - 21 Oct	United
29 Sep - 14 Oct	Delta
27 Sep - 03 Oct	Spirit Airlines
20 Sep - 01 Oct	Air Canada
24 Sep - 01 Oct	Air Canada
19 Sep - 01 Oct	Air Canada
26 Sep - 04 Oct	United

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 $366

Return flights