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

Return flights

22 Aug - 26 Aug	Air Canada
08 Aug - 15 Aug	Air Canada
07 Aug - 14 Aug	Air Canada
14 Aug - 26 Aug	Air Canada
18 Aug - 25 Aug	Delta
23 Aug - 27 Aug	Delta
08 Aug - 19 Aug	Air Canada
25 Aug - 29 Aug	Delta
21 Aug - 26 Aug	Air Canada
18 Aug - 27 Aug	Delta
26 Aug - 03 Sep	Delta
27 Aug - 03 Sep	Air Canada
27 Aug - 05 Sep	United
21 Aug - 04 Sep	United
28 Aug - 04 Sep	United
26 Aug - 01 Sep	United
29 Aug - 01 Sep	United
28 Aug - 01 Sep	United
25 Aug - 03 Sep	Lufthansa
29 Aug - 03 Sep	Lufthansa

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 283€

Return flights