AirHint found the following cheapest return flights from Cologne (CGN) to Keflavik (KEF) in May 2026 (see full year).
Return flights
| 13 May - 17 May | Ryanair | ||
| 13 May - 18 May | Ryanair | ||
| 16 May - 26 May | Eurowings | ||
| 31 May - 13 Jun | Austrian Airlines | ||
| 22 May - 07 Jun | Ryanair |
Also check the deals for one-way flights from Cologne to Keflavik in May.
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