With half a dozen Chinese airlines flying to the U.S. in addition to three U.S. airlines flying to China — and with China’s carriers growing capacity from secondary cities — fares to China are some of the lowest in the world.
Air China’s Shenzen flight is super interesting because the airport is a mere 24 miles from Hong Kong. You can take a taxi or ferry across to Hong Kong (there’s a border crossing involved) and save about $1000 roundtrip and avoid a connecting flight, or save $3000 roundtrip compared to Hong Kong non-stops.