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See you later; goodbye. So long, have a good weekend. I think we're ready to go. So long!
Good-bye. So long, see ya later. It's been good talking to you. So long.
Good-bye, as in So long, we'll see you next week. The allusion here is puzzling; long presumably means "a long time" and perhaps the sense is "until we meet again after a long time," but the usage has no such implication. [Colloquial; first half of 1800s]
so ˈlong (for now)(informal) goodbye until we next meet: So long for now. I’ll see you soon.
interj. Good-bye. It’s been good talking to you. So long.