AWS Inter Region Latency

AWS supports 15 regions (excluding China regions) for its services. Understanding latency between the regions is important as performance starts to have noticeable degradation when the latency is more than 150 - 200ms between a client and server or between two servers in two different regions.

Below is our measurement of AWS inter region latencies measured in milliseconds. The measurement is done by taking an average to multiple pings. The accuracy is +/- 1ms.