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Why does Modern Greek have flexible word order?

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Thematic map of Eurasia showing the approximate geographic distribution of Indo-European language families, each represented by a different color. Areas include Celtic in western Europe, Germanic in northern and central Europe, Romance in southwestern Europe, Slavic in eastern Europe and Russia, and Indo-Iranian languages in South Asia. Non-Indo-European language regions and areas of common bilingualism are also indicated. — Greek language Approximate locations of Indo-European languages in contemporary Eurasia.

Modern Greek maintains a flexible word order primarily because of its robust inflectional system.

In Greek, syntactical relationships—such as whether a noun is the subject or the object of a sentence—are clearly marked by case endings rather than relying strictly on the position of words within a sentence. Because these grammatical roles are encoded directly into the words themselves, the language allows for greater freedom in word order compared to languages like English, which depend more heavily on fixed word placement to convey meaning. Additionally, as in languages like Italian, the subject of a sentence in Modern Greek can often be omitted, further contributing to its syntactic flexibility.12