Are there nonstop flights from Houston (IAH) to Osaka (KIX)?

No. The fastest connection is via Vancouver, about 14h 4m of total flying time.

What is the fastest connection from Houston (IAH) to Osaka (KIX)?

via Vancouver ≈ 14h 4m, via Tokyo ≈ 14h 7m, via Tokyo ≈ 14h 8m (estimated flying time, excluding layovers).

from 20,000 ANA miles, from 50,000 JAL miles (economy, one way, based on the published award charts).

George Bush Intercontinental Airport (IAH) to Kansai International Airport (KIX)・11,103 km

No nonstop flights. The fastest connection is via Vancouver (YVR), about 14h 4m of flying time (layover not included).

With milesANA 20,000 miles+ (via HND)JAL 50,000 miles+ (via CDG)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

15 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.