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

Return flights

19 Aug - 03 Sep	Air Canada
25 Aug - 03 Sep	Delta	direct
25 Aug - 03 Sep	KLM
21 Aug - 29 Aug	Air Canada
19 Aug - 03 Sep	Icelandair	direct
18 Aug - 26 Aug	Air France
21 Aug - 26 Aug	Air Canada
19 Aug - 28 Aug	Air France
20 Aug - 24 Aug	United
21 Aug - 27 Aug	Air France
21 Aug - 28 Aug	Air France
23 Aug - 08 Sep	Air France
18 Aug - 05 Sep	Air France
21 Aug - 24 Aug	United
20 Aug - 25 Aug	Air Canada
22 Aug - 26 Aug	United
30 Aug - 05 Sep	Air France
18 Aug - 05 Sep	Icelandair	direct
30 Aug - 05 Sep	Virgin Atlantic	direct
30 Aug - 06 Sep	Air France	direct

Also check the deals for one-way flights from New York to Keflavik in August.

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 August from 325€

Return flights