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Currently the longest regular passenger flight is 9,534 mi (15,344 km) Singapore Airlines flight SQ 21 from Newark to Singapore, with duration of 18h30m. Flight is performed on Airbus A350-900ULR1).
The shortest scheduled regular commercial flight is Loganair's 1.7 mile (2.7 km) between Scottish islands of Westray and Papa Westray. It could take under 60 seconds2).
Cincinnati's Flamingo Air was providing a private 1-hour long “Romantic Flight” with curtains, champagne, chocolates, and a discreet pilot for $4253).