Dear [Supervisor/Teacher/Manager], I hope this letter finds you well. I am writing to explain and apologize for my tardiness on [date] at [time]. I understand that punctuality is crucial in maintaining a professional/workplace environment and I sincerely regret any inconvenience caused to the team/school/organization. The reason for my delayed arrival was [provide specific reason for tardiness]. [Explain the circumstances or events that led to the delay]. Despite my best efforts to be on time, unforeseen circumstances occurred that were beyond my control. I take full responsibility for my tardiness and assure you that it is not a reflection of my commitment to my responsibilities. I understand the impact of my late arrival on [workplace operations/student learning/workflow], and I want to assure you that I am taking immediate steps to prevent such situations from happening again. Furthermore, I have taken the following measures to ensure my punctuality moving forward: [mention any steps or changes you have implemented in your routine to prevent future tardiness]. Furthermore, I understand the importance of communication and I acknowledge that it is my responsibility to inform you promptly if I encounter any delays in the future. Furthermore, I apologize for not doing so on this occasion, and I assure you that it was an oversight and not intentional. Furthermore, I value my position at [company/school/organization] and the trust you have placed in me. Furthermore, I am fully committed to being punctual in the future, as I realize the detrimental effect tardiness can have on individual and group productivity. Once again, I apologize for my tardiness and any inconvenience caused. I would be grateful for your understanding and consideration. If you have any further questions or require any additional information, please do not hesitate to reach out to me. Thank you for your attention to this matter. Sincerely, [Your Name] [Your Position/Student ID] [Contact Information]