AirHint found the following cheapest return flights from New York (JFK) to Keflavik (KEF) in May 2026 (see full year).

Return flights

03 May - 10 May	Finnair
04 May - 11 May	Finnair
10 May - 21 May	Lufthansa
03 May - 09 May	Lufthansa
06 May - 16 May	Finnair
08 May - 17 May	Finnair
09 May - 17 May	Air France	direct
03 May - 09 May	Icelandair	direct
26 May - 31 May	Icelandair	direct
05 May - 30 May	Icelandair	direct
28 May - 06 Jun	Icelandair	direct
25 May - 03 Jun	Icelandair	direct
25 May - 06 Jun	Icelandair	direct
26 May - 20 Jun	Icelandair	direct
24 May - 03 Jun	Icelandair	direct
26 May - 02 Jun	Icelandair	direct

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

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 May from $444

Return flights