Well, how about when he ran away from his parents because he thought he would end up killing his father? Because he left, he ran TOWARDS his real parents.

Oedipus promises to get rid of whoever killed King Laius; however, HE was the one who unkowingly did it.

He also curses whoever killed the king, and wishes them a miserable and painful life. Jinx …

Incest was one of the worst crimes in ancient Greek. Because he left to avoid marrying his mother, he married his mother. Yeah. And had four kids with her.

There are tons of examples like this, just read it again and keep an eye out.

RE:
what is an example of situational irony in oedipus rex?