New answers tagged keigo
If you're not in a work environment, maybe you could use それでは
If you want to go old school and talk like you're out a manga, you can also say さらばだ.
さようなら is used mainly by school children, but adults use this less commonly in everyday conversations. Here's the list of possible expressions: お疲【つか】れ様【さま】です : Typically used after work. This is only polite enough to say goodbye to your colleagues. Don't say this to important external guests. (お先【さき】に)失礼【しつれい】します: Typically used when leaving (and entering) ...
You can always say 失礼します say goodbye or to excuse yourself (lit. "I'm being rude (by leaving))". This is probably the most common. There is also 失敬します, but I've heard this is rather old-man-ish and haven't heard anyone use in normal conversation.
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