I'm sorry for being late.
I appologize for being late.
2 กรกฎาคม 2015
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Thanks!!
2 กรกฎาคม 2015
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"I am sorry to be late" is perfectly correct. The second sentence might be better, "I apologize for being late." You could also say, "I'm sorry I'm late" or "I am sorry that I am late."