How long would it take to fly from Texas to Kentucky?

A random search for flights from Dallas Fort Worth (DFW) to Seoul Incheon (ICN) shows:

OPTION 1: 17hr 10min via Seattle/Tacoma (SEA)

DFW - SEA American Airlines Flt 621 Dep 10:40am 30Jul,Fri

SEA - ICN Korean Air Flt 20 Dep 02:40pm 30Jul,Fri

Flight Duration: 15hr 20min; Layover Time: 1hr 50min; Total Trip Time: 17hr 10min

OPTION 2: 18hr 45min via Chicago OHare (ORD) [Cheaper Option]

DFW - ORD American Airlines Flt 2374 Dep 08:15pm 30Jul,Fri

ORD - ICN Asiana Airlines Flt 235 Dep 01:00am 31Jul,Sat

Flight Duration: 16hr 10min; Layover Time: 2hr 35min; Total Trip Time: 18hr 45min