Are there nonstop flights from Haiphong (HPH) to Singapore (SIN)?

No. The fastest connection is via Phu Quoc Island, about 3h 35m of total flying time.

What is the fastest connection from Haiphong (HPH) to Singapore (SIN)?

via Phu Quoc Island ≈ 3h 35m, via Ho Chi Minh City ≈ 3h 35m, via Da Nang ≈ 3h 39m (estimated flying time, excluding layovers).

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

Cat Bi International Airport (HPH) to Singapore Changi Airport (SIN)・2,185 km

No nonstop flights. The fastest connection is via Phu Quoc Island (PQC), about 3h 35m of flying time (layover not included).

With milesANA 15,000 miles+ (via SZX)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.