AirHint found the following cheapest return flights from Washington (DCA) to Keflavik (KEF) in September 2026 (see full year).
Return flights
| 03 Sep - 07 Sep | Air Canada | ||
| 12 Sep - 19 Sep | Air Canada | ||
| 05 Sep - 11 Sep | Air Canada | ||
| 11 Sep - 16 Sep | Scandinavian Airlines | ||
| 03 Sep - 08 Sep | British Airways |
Also check the deals for one-way flights from Washington to Keflavik in September.
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