The venomous intruder was initially discovered crawling over seats on flight EZY6883 from Glasgow to Paris on Monday.
The flight was then held after the arachnid was seen again by a cleaner.
“EasyJet can confirm that a passenger reported to crew that a scorpion was onboard flight EZY6883 from Glasgow to Paris, Charles de Gaulle," read a statement from the company.
“The safety and comfort of our passengers and crew is always our highest priority so, as a precaution, the aircraft will be fumigated before its next flight, EZY6884 to Glasgow, which is delayed overnight as a result. Although this is outside of our control, we would like [to] apologisees for any inconvenience to passengers,” the airline said in a statement.
It added that passengers were being offered overnight accommodation in nearby hotels.
In April a Canadian man said he was stung by a scorpion while travelling on a United Airlines flight from Houston, Texas, to Calgary, in Canada.
While painful and occasionally requiring medical treatment, most scorpion stings are harmless to humans.