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

Return flights

06 Aug - 20 Aug	Air Canada
21 Aug - 26 Aug	Air Canada
20 Aug - 25 Aug	Air Canada
21 Aug - 25 Aug	Air Canada
22 Aug - 24 Aug	Air Canada
21 Aug - 24 Aug	Air Canada
22 Aug - 25 Aug	Air Canada
20 Aug - 24 Aug	Air Canada
04 Aug - 19 Aug	United
27 Aug - 05 Sep	Icelandair	direct
18 Aug - 26 Aug	Air Canada
21 Aug - 04 Sep	Air Canada
27 Aug - 07 Sep	Air Canada
25 Aug - 03 Sep	United
23 Aug - 02 Sep	Air Canada
27 Aug - 02 Sep	Air Canada
25 Aug - 03 Sep	Icelandair	direct
29 Aug - 08 Sep	United
29 Aug - 14 Sep	Air Canada
29 Aug - 07 Sep	Air Canada

Also check the deals for one-way flights from Newark 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 Newark to Keflavik in August from $366

Return flights