AirHint found the following cheapest return flights from Oslo (OSL) to Istanbul (IST) in April 2026 (see full year).
Return flights
| 19 Apr - 26 Apr | Pegasus Airlines | direct | |
| 03 Apr - 12 Apr | Air Serbia | ||
| 07 Apr - 11 Apr | Scandinavian Airlines | ||
| 07 Apr - 11 Apr | Turkish Airlines | direct | |
| 03 Apr - 12 Apr | Turkish Airlines | direct |
Also check the deals for one-way flights from Oslo to Istanbul in April.
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