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

Return flights

02 Mar - 14 Mar	SWISS
19 Mar - 26 Mar	Finnair
21 Mar - 28 Mar	Finnair
22 Mar - 29 Mar	Finnair
07 Mar - 14 Mar	Finnair
08 Mar - 15 Mar	Finnair
24 Mar - 07 Apr	Finnair
18 Mar - 25 Mar	British Airways
01 Mar - 11 Mar	Icelandair	direct
17 Mar - 24 Mar	Icelandair	direct
11 Mar - 18 Mar	Icelandair	direct
24 Mar - 07 Apr	Icelandair	direct
25 Mar - 06 Apr	Icelandair	direct
27 Mar - 10 Apr	Icelandair	direct
29 Mar - 12 Apr	Air France	direct
27 Mar - 03 Apr	Icelandair	direct

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

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 March from 345€

Return flights