Amazon Route53 DNS delivers the client directly to your server.

We are pleased to present you with Latency Based Routing (LBR) for Amazon Route 53, a highly reliable and cost-effective service. LBR is one of the most requested features that helps you improve the performance of your applications globally. LBR directs your users directly to the AWS endpoint, be it an EC2 instance, Elastic IP or ELB balancer.
So says the official announcement of the new feature from Amazon for Route53 DNS.


AWS reports that they constantly collect anonymous information about delays to end users, save them in the RDS, and use this data to make a comparative analysis of these delays.
The scheme works in such a way that Route 53 will automatically determine the data center closest to the client and return the IP of your application in it.

This feature works for “A”, “AAAA”, “CNAME”, “TXT” records, as well as for Route 53 specific “ALIAS to A” and “ALIAS to AAAA” record types.
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Prices:
$ 0.750 per million queries - First billion queries / month
$ 0.375 per million inquiries - After 1 billion inquiries / month

Calls to alias that are attached to the Elastic Load Balancers are free. These requests are included in the report (usage report) as “Intra-AWS-DNS-Queries”.