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

Return flights

18 Mar - 23 Mar	Scandinavian Airlines
10 Mar - 13 Mar	Scandinavian Airlines
09 Mar - 12 Mar	Scandinavian Airlines
09 Mar - 13 Mar	Scandinavian Airlines
09 Mar - 16 Mar	Scandinavian Airlines
23 Mar - 30 Mar	jetBlue
30 Mar - 06 Apr	jetBlue
04 Mar - 11 Mar	Scandinavian Airlines
07 Mar - 13 Mar	Scandinavian Airlines
07 Mar - 15 Mar	Scandinavian Airlines
07 Mar - 14 Mar	Scandinavian Airlines
26 Mar - 01 Apr	jetBlue
28 Mar - 05 Apr	jetBlue
28 Mar - 06 Apr	Icelandair

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 $505

Return flights