These airmile distances have been calculated using a website called - Great Circle Mapper. The destinations below are a few of the popular ones based on recent surveys.
 
I am sure you have gone to many more wonderful places.
 
I hope this gets you started! To calculate airmiles for other locations just use the code guide here to put them into the Mapper.
 
Use this format to put them into the Mapper:
                  Sydney to London -  type in - SYD-LON
                  Delhi to Vancouver - type in - DEL-YVR