Qantas said in a statement the 20-centimeter (8-inch) snake was found by staff in the passenger cabin near the door before passengers were due to board late Sunday at Sydney International Airport for a flight to Tokyo.
The Australian airline said the passengers were accommodated in hotels overnight and left Sydney on a replacement plane Monday morning.
The snake was taken by quarantine officials for analysis.
The Australian government on Monday did not immediately name the type of snake or say how it might have got aboard the plane which had flown to Sydney from Singapore.
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