AirHint found the following cheapest return flights from Cologne (CGN) to Oslo (OSL) in May 2026 (see full year).
Return flights
| 08 May - 10 May | Ryanair | ||
| 23 May - 26 May | Lufthansa | ||
| 24 May - 26 May | Ryanair | ||
| 14 May - 16 May | Lufthansa |
Also check the deals for one-way flights from Cologne to Oslo in May.
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