Are there nonstop flights from Hanoi (HAN) to Seattle (SEA)?

No. The fastest connection is via Beijing, about 13h 58m of total flying time.

What is the fastest connection from Hanoi (HAN) to Seattle (SEA)?

via Beijing ≈ 13h 58m, via Seoul ≈ 14h, via Chongqing ≈ 14h 3m (estimated flying time, excluding layovers).

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

Noi Bai International Airport (HAN) to Seattle–Tacoma International Airport (SEA)・10,994 km

No nonstop flights. The fastest connection is via Beijing (PEK), about 13h 58m of flying time (layover not included).

With milesJAL 40,000 miles+ (via NRT)ANA 40,000 miles+ (via TPE)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

19 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.