First, identify the aviation program you wish to attend and study that countries flying regulations. Many aeronautics programs will offer the course work and aeronautics but you may have to go to a separate school to train in flight hours. In the States flight hours must be completed in an FAA regulated program; there are similar parameters for Europe. Look for a program that includes flight school as part of their curriculum. Once, you have narrowed it down to a few programs of interest reach out to the schools admissions department to determine what scholarship options are available to you.
Keep in mind, flight school, is often seen as a "trade" school, it may be difficult to find a scholarship. Many of my students major in aeronautic, aviation maintenance or aerospace engineering as an undergraduate and then add a flight school certificate.
However, most countries in Europe usually offer 30%-50% scholarship. You might be lucky to get a fully funded one.
Gianoula Yianna’s Answer
Although you might be successful in finding a fully funded aviation program, you will have to budget for housing and other living expenses. Some countries, like Bulgaria, have a very low cost of living. More developed countries, like France and Germany, are very expensive.
After the Pandemic we are currently have a shortage of Commercial pilots across the globe , I would advise you to check in with the Airline companies to see if they are offering free tuition scholarships or tuition reimbursement if you work for them.