Are there nonstop flights from Chicago (ORD) to Hanoi (HAN)?

No. The fastest connection is via Seoul, about 16h 32m of total flying time.

What is the fastest connection from Chicago (ORD) to Hanoi (HAN)?

via Seoul ≈ 16h 32m, via Hong Kong ≈ 16h 44m, via Taipei ≈ 17h 1m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 47,000 JAL miles (economy, one way, based on the published award charts).

Chicago O'Hare International Airport (ORD) to Noi Bai International Airport (HAN)・12,847 km

No nonstop flights. The fastest connection is via Seoul (ICN), about 16h 32m of flying time (layover not included).

With milesANA 27,500 miles+ (via NRT)JAL 47,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

18 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.