AirHint found the following cheapest return flights from Washington (DCA) to Keflavik (KEF) in May 2026 (see full year).
Return flights
| 14 May - 25 May | Scandinavian Airlines | ||
| 10 May - 17 May | Scandinavian Airlines | ||
| 14 May - 06 Jun | United | ||
| 16 May - 21 May | United | ||
| 04 May - 11 May | Icelandair | ||
| 22 May - 31 May | jetBlue | ||
| 29 May - 06 Jun | Icelandair |
Also check the deals for one-way flights from Washington to Keflavik in May.
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