Are there nonstop flights from St Louis (STL) to Tokyo (NRT)?

No. The fastest connection is via Seattle, about 13h 14m of total flying time.

What is the fastest connection from St Louis (STL) to Tokyo (NRT)?

via Seattle ≈ 13h 14m, via Chicago ≈ 13h 20m, via Denver ≈ 13h 23m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 40,000 JAL miles (economy, one way, based on the published award charts).

St. Louis Lambert International Airport (STL) to Narita International Airport (NRT)・10,227 km

No nonstop flights. The fastest connection is via Seattle (SEA), about 13h 14m of flying time (layover not included).

With milesANA 27,500 miles+ (via ORD)JAL 40,000 miles+ (via SEA)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.