The opening of Asia's first "travel bubble" allowing tourism without quarantines since the pandemic hit has sparked a surge in searches and bookings for travel between Singapore and Hong Kong, stirring hopes the model could be rolled out more broadly.

Some of the first flights between the two cities starting Nov 22 on Singapore Airlines Ltd and Cathay Pacific Airways Ltd have already sold out, amid a quota of 200 daily travellers that will rise to 400 on Dec 7...