Originally Posted by LCY8737

It's relatively straightforward: Assuming J/F rtn you pay
£56 for LHR
£185 APD
Foreign taxes ranging from very little to ~£70

and then the big whopper is YQ
North America £700
China/Japan £300-£400
Sydney £714
Rest of world £500-£600

I assume China/Japan will follow the rest of world trend once meaningful flights resume.

The funny thing is that once you get to the final booking screen US flights (and maybe others?) drop by about £150 below the above numbers, but this only becomes clear at the very final payment stage. So probably a BA.com issue.