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

Return flights

14 Mar - 21 Mar	Icelandair	direct
13 Mar - 20 Mar	Icelandair	direct
15 Mar - 22 Mar	Icelandair	direct
09 Mar - 13 Mar	Icelandair	direct
06 Mar - 10 Mar	Icelandair	direct
08 Mar - 12 Mar	Icelandair	direct

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 401€

Return flights