Now with the latest support you can now deliver Amazon VPC Flow Logs to your S3

Delivering the Amazon VPC Flow Logs to AWS Storage Service (S3) as well as the CloudWatch Logs is now possible via the AWS Command Line Interface (CLI) or a personalized AWS EC2 or VPC console. You will find this method of archiving all your essential log events, simple and cost-effective. An added advantage is the inclusion of a number of different storage classes and solutions to process any custom data applications. You can also monitor your system and application functioning by delivering VPC Flow Logs to CloudWatch Logs. These can generate and visualize metrics, setting-up alerts or search the log events by accessing CloudWatch Logs.