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

Return flights

31 Mar - 07 Apr	Virgin Atlantic
04 Mar - 11 Mar	jetBlue
30 Mar - 06 Apr	jetBlue
02 Mar - 09 Mar	jetBlue
03 Mar - 10 Mar	jetBlue
28 Mar - 06 Apr	jetBlue
26 Mar - 31 Mar	jetBlue
01 Mar - 08 Mar	jetBlue
05 Mar - 09 Mar	Scandinavian Airlines
05 Mar - 08 Mar	Icelandair
13 Mar - 16 Mar	Icelandair
18 Mar - 21 Mar	Scandinavian Airlines
19 Mar - 22 Mar	Scandinavian Airlines
29 Mar - 04 Apr	jetBlue

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 451€

Return flights