AirHint found the following cheapest return flights from Basel (BSL) to Oslo (OSL) in September 2026 (see full year).
Return flights
| 06 Sep - 20 Sep | Norwegian | direct | |
| 17 Sep - 20 Sep | Wizz Air | ||
| 15 Sep - 18 Sep | Wizz Air | ||
| 17 Sep - 20 Sep | Norwegian | direct | |
| 07 Sep - 20 Sep | Norwegian Air Sweden AOC | ||
| 01 Sep - 02 Sep | Lufthansa |
Also check the deals for one-way flights from Basel to Oslo in September.
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