What is the cheapest way to get from Sydney to London and then to Toronto and back to Sydney again?

I'm planning my first overseas trip and would like to go to London and do a Topdeck Tour of Europe (starting and finishing in London) and then go to Canada (Toronto) to visit my brother before returning to Sydney. What is the cheapest/easiest way to do this? Is a Round the World ticket a good idea?What is the cheapest way to get from Sydney to London and then to Toronto and back to Sydney again?
Around the world ticket. You can get a 3 stop or a 5 stop which is a little dearer . It pays to shop around . I had a 5 stop with Air New Zealand . They gave me the best deal They belong to Star alliance so they not only book you on air NZ they use other carriers as well. I had to return though from USA with them via NZ but leaving I flew from Australia with singapore air and from London to Canada they put me with Air Canada. I phoned Air New Zealand direct and had shopped around with flight Centre and other places. They will all come up with something different. Qantas belong to One World so they use carriers that also belong to One world British airways is one that belongs to one world. They where a little dearer . I had great flights.What is the cheapest way to get from Sydney to London and then to Toronto and back to Sydney again?
Check out the Round the World tickets with Qantas and British Airways. Great value.



And you can add a few more countries to your itinerary too....all included in the price.