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

Return flights

28 Jul - 02 Aug	Air France	direct
29 Jul - 06 Aug	Icelandair	direct
27 Jul - 04 Aug	Icelandair	direct
31 Jul - 07 Aug	Air Canada
28 Jul - 01 Aug	Icelandair	direct
30 Jul - 06 Aug	Icelandair	direct
30 Jul - 05 Aug	Icelandair	direct
30 Jul - 02 Aug	Delta	direct
31 Jul - 03 Aug	Lufthansa
31 Jul - 07 Aug	Icelandair	direct

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

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 July from 342€

Return flights