Tickets on trips from Hong Kong to Portugal were sold on the airline's website for $1,512, instead of $16,000 usually charged for a similar journey.
The carrier said it would honour the tickets as it investigates the cause of the error.
It extends a recent run of blows to the firm including a huge data breach.
The mispriced fares were available on Cathay Pacific's website on Sunday.
First-class flights from Lisbon to Hong Kong - via London with a connecting flight - were offered for $1,512 (£1,177), according to the South China Morning Post.