Are there nonstop flights from Sydney (SYD) to Seattle (SEA)?

No. The fastest connection is via Honolulu, about 15h 41m of total flying time.

What is the fastest connection from Sydney (SYD) to Seattle (SEA)?

via Honolulu ≈ 15h 41m, via Vancouver ≈ 15h 56m, via San Francisco ≈ 16h 21m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 40,000 JAL miles (economy, one way, based on the published award charts).

Sydney Kingsford Smith International Airport (SYD) to Seattle–Tacoma International Airport (SEA)・12,472 km

No nonstop flights. The fastest connection is via Honolulu (HNL), about 15h 41m of flying time (layover not included).

With milesANA 30,000 miles+ (via HND)JAL 40,000 miles+ (via HNL)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

23 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.