1. Since his post tonsillectomy
bleeding was controlled by conservative (non-surgical) management, it should be safe for him to fly after two weeks. Wound healing
should be complete by then.
2. He should also have received i.v. antibiotics to prevent secondary infection along with tranexamic acid
3. Your final decision should be based on his scheduled ENT examination. If he has had no further signs and symptoms after the 13th of May, all should be fine.