Are there nonstop flights from Houston (IAH) to Ho Chi Minh City (SGN)?

No. The fastest connection is via Taipei, about 18h 36m of total flying time.

What is the fastest connection from Houston (IAH) to Ho Chi Minh City (SGN)?

via Taipei ≈ 18h 36m, via Tokyo ≈ 18h 42m, via Tokyo ≈ 18h 42m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 50,000 JAL miles (economy, one way, based on the published award charts).

George Bush Intercontinental Airport (IAH) to Tan Son Nhat International Airport (SGN)・14,904 km

No nonstop flights. The fastest connection is via Taipei (TPE), about 18h 36m of flying time (layover not included).

With milesANA 27,500 miles+ (via HND)JAL 50,000 miles+ (via CDG)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

13 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.