This fare is back until December 2. GRU/BOG/PTY are around the same price.
Example:
BKK-IST-GRU-EZE -- $2,653
(Google Flights and ITA Matrix in fact indicate a wider ex-BKK sale, to European destinations for ~$1,850 and N./S. American destinations for ~$2,650. But only EZE/GRU/BOG/PTY seem to price out on the TK website.)