AirHint found the following cheapest return flights from Oslo (OSL) to Basel (BSL) in May 2026 (see full year).
Return flights
| 28 May - 07 Jun | Norwegian | direct | |
| 28 May - 01 Jun | Norwegian | ||
| 28 May - 08 Jun | Norwegian | ||
| 28 May - 31 May | Norwegian | direct |
Also check the deals for one-way flights from Oslo to Basel in May.
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