where are you off to? = where are you going?, where are you going to? 0:53 so where are you off to now? I haven't made up my mind. 今度はどこへ行くんだい?まだ決めてないわ。
Picard and Vash Say Goodbye
0:16 where are you off to in such a hurry? shopping. it's dollar day. そんなに急いでどこへ行くの?お買い物よ。今日は特売日なの。
Bewitched | Fashion Moments | Classic TV Rewind
8:17 where are you off to? oh, just some place to laze about. 今回の使命は?どこか羽を伸ばせるところさ。
All the Miss Moneypenny scenes 1962 - 2012
0:49 where are you off to? north. どこへ向かう?北さ。
"Hard Times" Last Scene 1 Saying Goodbye
参考リンク
http://bridge-english.blogspot.com/2015/05/off-to.html off to