While purchasing the first ticket, you can mark the Return button, or after purchasing one-way, you can re-enter the system and purchase the return tickets by examining the reverse route sign with the reverse route sign.
When you search for flights between İstanbul and Hong Kong, all active companies and flight times on the date you entered are listed. You can find the cheapest flight tickets by sorting this list by price.
The most frequently used airline companies from İstanbul to Hong Kong are generally
Türk Hava Yolları,
Emirates,
Lufthansa,
China Eastern Airlines,
Qatar Airways,
Air France,
China Southern Airlines,
Air New Zealand,
Cathay Pacific,
Asiana Airlines,
Ethiopian Airlines,
Miat Mongolian Airlines,
Thai Airways Intl,
Finnair,
Hong Kong Airlines,
British Airways,
Sichuan Airlines,
Korean Air,
LOT Polish Airlines,
Malindo Airways,
Royal Jordanian,
KLM Royal Dutch Airlines,
Singapore Airlines
are companies.