In English, if a bad situation seems imminent but is finally avoided, we might reply with an interjection like "Thank goodness!" or "Whew!". I know "Thank goodness!" has several possible translations at the beginning of a sentence, but I'm thinking of it being used as a standalone interjection. What is typically said in Spanish in situations like this?
A usual translation for the interjection "Whew!" is
In these situations it is common to say:
It is also common to say
In Uruguay we say also "En el anca de un piojo" but I don't know if this is common elsewhere.
to express how close to the bad situation we had come.
"Thank goodness" might also be "Gracias a Dios", but this may have a religious component.
A common verb is "zafar". For example,
Just to add to Bruno's answer you can say these aswell:
and for some humor we say sometimes this in Colombia:
The translation would be I saved myself by the hair of a bald frog. Since frogs have no hair, a bald frog would have even less hair. So he saved himself by so little!