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

Return flights

09 Mar - 13 Mar	Scandinavian Airlines
19 Mar - 23 Mar	Scandinavian Airlines
12 Mar - 19 Mar	Scandinavian Airlines
11 Mar - 18 Mar	Scandinavian Airlines
10 Mar - 17 Mar	Icelandair
31 Mar - 07 Apr	Icelandair
07 Mar - 28 Mar	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 $549

Return flights