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

Return flights

31 Aug - 08 Sep	Icelandair	direct
24 Aug - 28 Aug	Icelandair	direct
18 Aug - 27 Aug	Icelandair	direct
30 Aug - 11 Sep	Icelandair	direct
25 Aug - 11 Sep	Icelandair	direct
31 Aug - 05 Sep	Icelandair	direct
19 Aug - 28 Aug	Icelandair	direct
22 Aug - 03 Sep	Air Canada
21 Aug - 24 Aug	United
22 Aug - 24 Aug	United
22 Aug - 25 Aug	United
20 Aug - 27 Aug	Air Canada
22 Aug - 27 Aug	United
23 Aug - 30 Aug	United
22 Aug - 29 Aug	United
21 Aug - 13 Sep	United
22 Aug - 02 Sep	United
19 Aug - 13 Sep	Icelandair	direct
29 Aug - 06 Sep	Spirit Airlines
26 Aug - 02 Sep	Icelandair	direct

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 244€

Return flights