$0.010 per GB - regional data transfer - in/out/between EC2 AZs or using elastic IPs or ELB

at flag

In my current AWS account, I have only one instance in Us-West -2. I do not have a ELB. The Elastic IP is in the same region. It does not specify any availability zone. but wrt RDS, this instance is connected to in a different availability zone of the same region and it also access few S3 buckets created in other region.. Is it why I am getting charged? any thoughts on this will be appreciated.

gp flag

Any inter-AZ traffic like EC2 in AZ-A to RDS in AZ-B will incur inter-AZ traffic charges. I suggest you move your resources into one AZ to eliminate those charges. One fairly easy way to do this is to snapshot the EC2 / RDS and create a new one based on the image. If you need instructions search for "Move AWS EC2 instance to another availability zone" or similar.

S3 access isn't inter-AZ, it's either via the internet gateway or the VPC endpoint. Make sure you provision an S3 gateway endpoint (not interface endpoint) in your VPC that way S3 traffic is free.

at flag
Thank you for the response. Will have it tried.

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