AirHint found the following cheapest return flights from London (STN) to Keflavik (KEF) in September 2026 (see full year).
Return flights
| 18 Sep - 30 Sep | easyJet | ||
| 01 Sep - 30 Sep | easyJet | ||
| 03 Sep - 19 Sep | Ryanair | ||
| 19 Sep - 27 Sep | Ryanair | ||
| 03 Sep - 12 Sep | Ryanair | ||
| 09 Sep - 19 Sep | Ryanair | ||
| 05 Sep - 13 Sep | Ryanair | ||
| 28 Sep - 11 Oct | Ryanair |
Also check the deals for one-way flights from London to Keflavik in September.
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