AirHint found the following cheapest return flights from Washington (IAD) to Keflavik (KEF) in August 2026 (see full year).
Return flights
| 26 Aug - 09 Sep | Scandinavian Airlines | ||
| 19 Aug - 04 Sep | Icelandair | direct | |
| 23 Aug - 06 Sep | United | direct | |
| 26 Aug - 09 Sep | Icelandair | direct | |
| 11 Aug - 18 Aug | SWISS | ||
| 11 Aug - 18 Aug | Icelandair | direct |
Also check the deals for one-way flights from Washington to Keflavik in August.
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