Are there nonstop flights from New Delhi (DEL) to Vientiane (VTE)?

No. The fastest connection is via Yangon, about 4h 34m of total flying time.

What is the fastest connection from New Delhi (DEL) to Vientiane (VTE)?

via Yangon ≈ 4h 34m, via Bangkok ≈ 5h 1m, via Bangkok ≈ 5h 4m (estimated flying time, excluding layovers).

from 15,000 ANA miles (economy, one way, based on the published award charts).

Indira Gandhi International Airport (DEL) to Wattay International Airport (VTE)・2,847 km

No nonstop flights. The fastest connection is via Yangon (RGN), about 4h 34m of flying time (layover not included).

With milesANA 15,000 miles+ (via BKK)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

10 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

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