If I don’t have enough miles, can I top up my miles to pay for my airfare?

No. The Top-up option is only available for Flight Awards and Travel Awards but not applicable for booking flights on the Cathay Pacific Website by using Miles Plus Cash payment option.

More about Miles Plus Cash other features

Is there a cap of miles for Miles Plus Cash payment?
Will Miles Plus Cash payment be treated as a mileage use activity, thereby extending the expiration date of my miles?
If I book with Miles Plus Cash, can I still earn miles for the flight?
I'm paying with my Asia Miles co-branded credit card, can I also earn miles from the Miles Plus Cash payment?
If I have purchased a ticket with the full miles payment option, is it considered a Flight Award ticket?

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