Bargain for $1500 Return from Sydney to London from Expedia BR

I was looking for a reasonably costing air fare ticket to London during November, and I found an about $1500 return from Expedia Brazil. I think many dates are possible for this deal, so make sure to check your calendar. But the dates I put for my ticket fare were going to my destination on 7th of November and returning on 23rd of November. My second date was going on 18th of November and returning on 30th of November. The currency on the expedia website is in Brazilian, so if you want to not take part an addition of currency exchange fees, you should pay using Citibank Visa Debit or 28 degrees or use standard cards. This was the cheapest deal I found with an addition of carriers going up to around $1800.