回复：回复：H-1/10 Day - 回复：You don't need to if - 回复：什么时候我必须离境签h1b?

You may leave US after Oct 1st, while I would not recommend it.

1) You do have grace period on F-1, however it may be regarded as a gap after Aug 20th;
2) You may not work after Oct 1st, even with your approval notice.

Try harder to find a ticket