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

Return flights

06 May - 13 May	Finnair
04 May - 13 May	Finnair
15 May - 18 May	Air France
09 May - 17 May	Air France
07 May - 21 May	Air France
19 May - 27 May	Air France	direct
14 May - 21 May	Virgin Atlantic
20 May - 28 May	Air France
20 May - 29 May	Air France
04 May - 13 May	Icelandair	direct
30 May - 07 Jun	Icelandair	direct
02 May - 05 Jun	Icelandair	direct
24 May - 06 Jun	Icelandair	direct
27 May - 03 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 $441

Return flights