Why is there such a huge difference in the amount of tax and surcharges among the airlines?

For a return flight from Singapore to Seoul, Thai Airways charges 270 SGD for the tax and surcharges! Cathay Pacific, on the other hand, charges only 170 bucks for that. Why is there such a wide gap among different airlines? Is it because Bangkok's Suvarnabhumi Airport is new and therefore its airport tax is... show more For a return flight from Singapore to Seoul, Thai Airways charges 270 SGD for the tax and surcharges! Cathay Pacific, on the other hand, charges only 170 bucks for that. Why is there such a wide gap among different airlines? Is it because Bangkok's Suvarnabhumi Airport is new and therefore its airport tax is exorbitant?
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