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

Return flights

09 Mar - 17 Mar	British Airways
10 Mar - 18 Mar	British Airways
11 Mar - 19 Mar	British Airways
08 Mar - 16 Mar	British Airways
14 Mar - 22 Mar	British Airways
12 Mar - 20 Mar	British Airways
12 Mar - 26 Mar	British Airways
07 Mar - 15 Mar	British Airways
13 Mar - 21 Mar	British Airways
30 Mar - 03 Apr	Air France
15 Mar - 29 Mar	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 517€

Return flights