Largely demand/supply. When you get to the time shortly before a flight, airlines typically post very high prices since:
1.) There may only be a few seats left on that flight. The airline figures someone might be desperate enough to pay the asking price.
2.) Someone looking at last minute travel arrangements probably doesn’t have much flexibility and likely will be travelling that route by some means.
For some routes, specific times of the week may see higher demand than others.
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