I was looking into the documentation of s3distcp (https://docs.aws.amazon.com/emr/latest/ReleaseGuide/UsingEMR_s3distcp.html) but I was not able to find any explicit site where mention about costs of each action. This is a sample scenario:
Questions is:
AWS S3 costs will be billed as separate line items from your AWS EMR costs, so you should factor in S3 costs in addition to the EMR charges. S3 costs in this scenario will include charges for requests and possibly data transfer as per the S3 pricing guide.
That said, the associated S3 charges are likely to be trivial relative to the cost of an EMR cluster.