How do I write a letter of excuse for work?

Write a letter of excuse for work by explaining the details of your absence, communicating any arrangements you've made for your absence, and thanking the person for their understanding.

Be brief but thorough, describing how long and why you're going to be gone, as well as who will be covering for you. You can also invite the recipient and any coworkers to contact you during your absence -- just remember to provide the information they need to be able to do this.