The storm has claimed the lives of seven people.
Spain's Red Cross confirmed the cash donation by thanking the shot-stopper for his generosity yesterday/on Thursday.
The organisation said in a social media message alongside a picture of the footballer: “€200,000 to support the people affected by the flooding in Alicante and Murcia.
“David de Gea, thanks for your solidarity."
The provinces of Alicante and Murcia were the worst affected by last week's storm, with torrential rain causing widespread flooding and leaving many areas cut off.