Are there nonstop flights from Vientiane (VTE) to Sainyabuli (ZBY)?

Yes. Lao Air fly this route. Flight time is about 42m.

Vientiane → Sainyabuli

Wattay International Airport (VTE) to Sayaboury Airport (ZBY)・167 km

Nonstop flights available (1 airline). Flight time about 42m. Nonstop return flights also operate.

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