Are there nonstop flights from Sapporo (OKD) to Rishiri (RIS)?

Yes. Hokkaido Air System fly this route. Flight time is about 47m.

Sapporo → Rishiri

Sapporo Okadama Airport (OKD) to Rishiri Airport (RIS)・237 km

Nonstop flights available (1 airline). Flight time about 47m. Nonstop return flights also operate.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.