I was trying to book two tickets to Tokyo and was quite surprised to learn that SIA's airfares seem to get more expensive the closer the date (I always thought airfares were the most expensive the earlier you book).
I went on Singaporeair.com.sg sometime in August and at that time, I could get two tickets for around S$1200 + S$152 (taxes & surcharges).
Today, if I go online, they cost S$1800 + S$514 (taxes & surcharges). The exact same dates were chosen.
What I was surprised was that the taxes and surcharges actually change! I thought they were fixed costs regardless of the air ticket cost.
One clue to this could be that now only the "Flexi" option is available. Previously, there were "Super Deals", "Flexi Saver" and "Flexi". It could be because all the Super Deals and Flexi Savers were sold out?
Any help would be appreciated.