By Air
Hong Kong International Airport (IATA: HKG) on Lantau Island is one of Asia's principal hubs, with direct flights from most major cities worldwide. From Europe and North America, typical flight times are 12–14 hours. The Airport Express train connects the airport to Hong Kong Station in Central in 24 minutes, with a stop at Tsing Yi and Kowloon Station en route. It runs every 10 minutes and costs around HK$115 from the airport to Central; tickets include the right to check in luggage at the city-side stations the morning of your flight. The bus is considerably slower but cheaper — the A series routes (A10, A11, A21) serve most parts of the city for around HK$45.
By Rail
The MTR East Rail Line connects Lo Wu and Lok Ma Chau on the mainland border to Hong Kong via Kowloon. From the Shenzhen side you can take a through-train from Guangzhou East or transfer at Lo Wu. High-speed trains (Guangzhou-Shenzhen-Hong Kong Express Rail Link) run from West Kowloon station directly to Guangzhou South, Shenzhen North, and beyond — significantly faster than the old Kowloon-Canton Railway. The West Kowloon terminus opened in 2018 and gives access to the Chinese national rail network, with services reaching Beijing and Shanghai.
By Sea
Frequent high-speed ferries connect Hong Kong to Macau (roughly 1 hour), Guangzhou, Zhongshan, Zhuhai, and several other Pearl River Delta cities. The main terminals are the China Ferry Terminal in Tsim Sha Tsui and the Macau Ferry Terminal in Sheung Wan. Ferries to Macau run 24 hours a day and cost around HK$170–200. The Hong Kong–Zhuhai–Macau Bridge (opened 2018) also connects to Macau by bus for those who prefer a road crossing.