I’m flying to Bali next month on SQ due to a stop in SG I have to make. Basically have Y+ ticket but SIN-DPS is in M class as only Y/J is the cabins on the 787. What’s the chance an upgrade bid of A$250 would go through? I was able to place it a few weeks back and out of all my flights it’s the only one I could upgrade too. Max upgrade possible is A$400.