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

Return flights

07 Aug - 14 Aug	Air Canada
08 Aug - 15 Aug	Air Canada
21 Aug - 29 Aug	Air Canada
19 Aug - 03 Sep	Air Canada
20 Aug - 25 Aug	United
21 Aug - 25 Aug	United
25 Aug - 03 Sep	Air Canada
20 Aug - 24 Aug	United
21 Aug - 24 Aug	United
19 Aug - 26 Aug	Air Canada
21 Aug - 26 Aug	United
22 Aug - 26 Aug	United
31 Aug - 09 Sep	KLM
23 Aug - 08 Sep	Delta
31 Aug - 09 Sep	Icelandair	direct
23 Aug - 08 Sep	United	direct
09 Aug - 09 Sep	United
30 Aug - 05 Sep	Air France
20 Aug - 04 Sep	SWISS
19 Aug - 03 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 317€

Return flights