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"Like all Singaporeans, we couldn't be more proud of Joseph's amazing performance at the 2016 Rio Olympics.
"He has flown our flag high by bringing home Singapore's very first Olympic Gold medal.
"So it is with great pleasure that we present Joseph with his very own Singapore Airlines KrisFlyer Elite Gold card, and one million KrisFlyer Miles.
"Because the King of the Butterfly deserves a Great Way to Fly."
The 21-year-old made history after smashing the current Olympic record and clocked a swim time of 50.39 at the Men's 100m Butterfly.
He also beat the legendary Michael Phelps, who has won 22 Olympic gold medals at time of reporting.