It's a good thing (that)...
... olması iyi bir şey.
It's just as well...
İyi ki ...
Fortunately, / Luckily,
Allahtan / Bereket versin
As luck would have it...
Şansa ...
That was a stroke of luck.
Bu talih kuşuydu.
It's lucky...
Bu şanslı ...
It's very/most fortunate (that)...
Çok şanslısın ki ...
That was a close thing / near miss
Ucuz atlattık
It must be your lucky day!
Şanslı günün olmalı!
You lucky thing! / You jammy bastard!
Şanslı şey ! / Ballı köpek !(sadece çok samimi)