This etiquette expert would advise you to never arrive late for a meeting or an appointment. It’s not all about you. Other people have schedules too and your tardiness interrupts their schedules. You may also be perceived as being disrespectful to the people you are meeting with.
There are times when arriving late is unavoidable such as getting stuck in an unexpected traffic delay. If you are going to be late for a scheduled meeting, please call the party you are meeting with to apologize and notify them of your tardiness and your expected arrival time. Depending on how late you’re going to be, the party you are meeting with now has the option to delay the meeting, move forward and let you catch up, or reschedule the meeting.