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

Return flights

16 Mar - 23 Mar	Scandinavian Airlines
03 Mar - 10 Mar	Scandinavian Airlines
31 Mar - 07 Apr	Finnair
02 Mar - 09 Mar	Scandinavian Airlines
01 Mar - 08 Mar	Scandinavian Airlines
20 Mar - 29 Mar	jetBlue
02 Mar - 07 Mar	jetBlue
18 Mar - 22 Mar	jetBlue
19 Mar - 24 Mar	Icelandair
19 Mar - 29 Mar	jetBlue
14 Mar - 22 Mar	Icelandair
30 Mar - 03 Apr	Icelandair
13 Mar - 04 Apr	British Airways
26 Mar - 18 Apr	British Airways
28 Mar - 04 Apr	British Airways

Also check the deals for one-way flights from Washington 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 Washington to Keflavik in March from 442€

Return flights