A 2 in 1 trip...
Open-jaw flights departing from Paris, France to both Melbourne, Australia and Beijing, China, before returning to London, UK for only £498 with Air China.
Flights from New York to Christchurch, New Zealand for $1014 return.
There is a 12-hour daytime layover in Sydney, Australia. More than enough time to exit the airport and explore the city before continuing your journey.