Hi, I have a BA Silver Card and am planning to book some flights to South America next year on BA using my Avios.

I propose - LHR - GRU /- EZE - LHR

Flying out F and back J.

I'll have to book as 2 singles as their website doesn't allow open jaw.

What would the refund fee be, if I had to cancel? Can't find anywhere on the website.

Thanks in advance.