Yukari is a pretty likely candidate as >>15328123 and >>15328173 pointed out. Marisa's got a decent shot too due to IN dialogue, but it could be any language, and knowing a few tidbits is not knowing a whole language. Sakuya/ Remilia/ Flandre have a decent chance due to coming from the west, and Alice Margatroid is a very western name, especially fitting for someone in Britain, so it wouldn't be out of the question for her to know English that said, it's never been specifically stated that she is from the west or even implied she is multilingual, so this is shaky even for speculation. Patchy is probably adept in many languages and also came from the west, so I'd even say she's more likely than not to know English, probably just as likely as Yukari. Yama has been judging dead people for a long time so maybe she's picked up on some languages, and Komachi is a talker that ferries dead people so she's bound to know some. Rinnosuke's pretty old and has read a lot of books, especially one on digital computers mentioning the letter 'F', and speculates on the letter 'F's position in the alphabet and ASCII(even if he didn't realize it was ASCII). Thus Rinnosuke is at least somewhat likely to have a loose grasp on English. There's nothing that says Satori can understand English but she can read minds on the unconscious level so you would probably be able to communicate with her, albeit not speaking in a normal way.
I'm only familiar with characters up to SA enough to be comfortable speculating on them so I'll stop there. Here's a tier list:
Rinnosuke, Yama, Komachi
Sakuya, Remilia, Flandre