"These birds fly to Australia."

Translation: Ezek a madarak Ausztráliába repülnek.

[guilth]

why not: ezek a madarak repülnek ausztáliába?

[vvsey]

It is good. Note that your version emphasizes "these birds" as opposed to other birds.

[BetsyLowe]

I reversed Ausztraliába and repülnek. Is that incorrect?

[RyagonIV]

"Ausztráliánek repülba"? :P
If you mean the same thing the guy above suggested already: it's a fine translation.