Are there nonstop flights from Gaua Island (ZGU) to Luganville (SON)?

Yes. Air Vanuatu fly this route. Flight time is about 40m.

Gaua Island → Luganville

Gaua Island Airport (ZGU) to Santo Pekoa International Airport (SON)・148 km

Nonstop flights available (1 airline). Flight time about 40m. Nonstop return flights also operate.

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