Round-trip flights from Houston (IAH) to Hong Kong (HKG) are $608 with a connection in Incheon (ICN). Connection times are usually three to four hours but if you encounter a longer one, you should probably try to pick a different departure or return date. Fare allows stopovers in Incheon for $100 each. Which means you can visit BOTH Hong Kong and South Korea for about $733!
Click for more details and booking links Cheap Flights: Houston to Hong Kong $608 r/t – Korean Air