This is not an official report nor reliable benchmark. The testing environments are vary. These EC2 latencies are measured by http://aws-latency.altaircp.com/ Thanks to my friends!
If you want to add a result from your location, feel free to comment on this gist. Please note that you need to try it several times to get an accurate result.
Asia Pacific (Seoul) ap-northeast-2 19ms
Asia Pacific (Tokyo) ap-northeast-1 92ms
US West (Oregon) us-west-2 137ms
US West (N. California) us-west-1 177ms
Asia Pacific (Sydney) ap-southeast-2 192ms
US East (N. Virginia) us-east-1 238ms
EU (Ireland) eu-west-1 309ms
EU (Frankfurt) eu-central-1 310ms
Asia Pacific (Singapore) ap-southeast-1 327ms
South America (Sao Paulo) sa-east-1 389ms
Asia Pacific (Tokyo) ap-northeast-1 8ms
Asia Pacific (Seoul) ap-northeast-2 35ms
Asia Pacific (Singapore) ap-southeast-1 75ms
US West (N. California) us-west-1 107ms
Asia Pacific (Sydney) ap-southeast-2 115ms
US West (Oregon) us-west-2 127ms
US East (N. Virginia) us-east-1 167ms
EU (Frankfurt) eu-central-1 241ms
EU (Ireland) eu-west-1 252ms
South America (Sao Paulo) sa-east-1 279ms
Asia Pacific (Tokyo) ap-northeast-1 550ms
Asia Pacific (Singapore) ap-southeast-1 1057ms
Asia Pacific (Seoul) ap-northeast-2 1178ms
Asia Pacific (Sydney) ap-southeast-2 1364ms
US West (Oregon) us-west-2 1510ms
US East (N. Virginia) us-east-1 1814ms
South America (Sao Paulo) sa-east-1 1884ms
EU (Ireland) eu-west-1 1891ms
EU (Frankfurt) eu-central-1 1945ms
US West (N. California) us-west-1 2070ms
Asia Pacific (Singapore) ap-southeast-1 43ms
Asia Pacific (Tokyo) ap-northeast-1 61ms
Asia Pacific (Seoul) ap-northeast-2 80ms
US West (N. California) us-west-1 156ms
Asia Pacific (Sydney) ap-southeast-2 179ms
US West (Oregon) us-west-2 187ms
EU (Frankfurt) eu-central-1 206ms
EU (Ireland) eu-west-1 229ms
US East (N. Virginia) us-east-1 230ms
South America (Sao Paulo) sa-east-1 332ms
Asia Pacific (Tokyo) ap-northeast-1 536ms
Asia Pacific (Singapore) ap-southeast-1 568ms
Asia Pacific (Seoul) ap-northeast-2 636ms
Asia Pacific (Sydney) ap-southeast-2 1074ms
US West (N. California) us-west-1 1121ms
US West (Oregon) us-west-2 1292ms
US East (N. Virginia) us-east-1 1557ms
EU (Ireland) eu-west-1 1809ms
South America (Sao Paulo) sa-east-1 1916ms
EU (Frankfurt) eu-central-1 1938ms
Asia Pacific (Tokyo) ap-northeast-1 185ms
Asia Pacific (Singapore) ap-southeast-1 242ms
South America (Sao Paulo) sa-east-1 372ms
US West (Oregon) us-west-2 480ms
US West (N. California) us-west-1 549ms
Asia Pacific (Sydney) ap-southeast-2 973ms
EU (Ireland) eu-west-1 986ms
EU (Frankfurt) eu-central-1 1204ms
US East (N. Virginia) us-east-1 2207ms
Asia Pacific (Seoul) ap-northeast-2 2769ms
Asia Pacific (Tokyo) ap-northeast-1 47ms
Asia Pacific (Singapore) ap-southeast-1 68ms
Asia Pacific (Seoul) ap-northeast-2 90ms
US West (N. California) us-west-1 142ms
Asia Pacific (Sydney) ap-southeast-2 155ms
US West (Oregon) us-west-2 173ms
US East (N. Virginia) us-east-1 219ms
EU (Ireland) eu-west-1 298ms
EU (Frankfurt) eu-central-1 303ms
South America (Sao Paulo) sa-east-1 328ms
Asia Pacific (Singapore) ap-southeast-1 9ms
Asia Pacific (Tokyo) ap-northeast-1 99ms
Asia Pacific (Seoul) ap-northeast-2 109ms
Asia Pacific (Sydney) ap-southeast-2 115ms
US West (Oregon) us-west-2 186ms
US West (N. California) us-west-1 202ms
EU (Frankfurt) eu-central-1 210ms
EU (Ireland) eu-west-1 216ms
US East (N. Virginia) us-east-1 262ms
South America (Sao Paulo) sa-east-1 384ms
Asia Pacific (Singapore) ap-southeast-1 86ms
Asia Pacific (Tokyo) ap-northeast-1 112ms
US West (Oregon) us-west-2 210ms
EU (Ireland) eu-west-1 304ms
Asia Pacific (Seoul) ap-northeast-2 458ms
Asia Pacific (Sydney) ap-southeast-2 569ms
EU (Frankfurt) eu-central-1 576ms
US West (N. California) us-west-1 598ms
South America (Sao Paulo) sa-east-1 1075ms
US East (N. Virginia) us-east-1 1589ms
Asia Pacific (Singapore) ap-southeast-1 41ms
Asia Pacific (Seoul) ap-northeast-2 122ms
Asia Pacific (Tokyo) ap-northeast-1 150ms
EU (Frankfurt) eu-central-1 213ms
Asia Pacific (Sydney) ap-southeast-2 233ms
US West (Oregon) us-west-2 277ms
US East (N. Virginia) us-east-1 285ms
EU (Ireland) eu-west-1 306ms
US West (N. California) us-west-1 310ms
South America (Sao Paulo) sa-east-1 473ms
EU (Frankfurt) eu-central-1 59ms
EU (Ireland) eu-west-1 75ms
US East (N. Virginia) us-east-1 145ms
Asia Pacific (Tokyo) ap-northeast-1 157ms
US West (Oregon) us-west-2 202ms
US West (N. California) us-west-1 203ms
Asia Pacific (Seoul) ap-northeast-2 205ms
Asia Pacific (Singapore) ap-southeast-1 247ms
South America (Sao Paulo) sa-east-1 289ms
Asia Pacific (Sydney) ap-southeast-2 348ms
EU (Frankfurt) eu-central-1 31ms
EU (Ireland) eu-west-1 47ms
US East (N. Virginia) us-east-1 124ms
US West (Oregon) us-west-2 179ms
US West (N. California) us-west-1 190ms
Asia Pacific (Singapore) ap-southeast-1 225ms
South America (Sao Paulo) sa-east-1 245ms
Asia Pacific (Tokyo) ap-northeast-1 288ms
Asia Pacific (Seoul) ap-northeast-2 320ms
Asia Pacific (Sydney) ap-southeast-2 373ms
US East (N. Virginia) us-east-1 43ms
US West (N. California) us-west-1 82ms
US West (Oregon) us-west-2 93ms
EU (Frankfurt) eu-central-1 125ms
EU (Ireland) eu-west-1 129ms
South America (Sao Paulo) sa-east-1 160ms
Asia Pacific (Seoul) ap-northeast-2 180ms
Asia Pacific (Tokyo) ap-northeast-1 207ms
Asia Pacific (Sydney) ap-southeast-2 245ms
Asia Pacific (Singapore) ap-southeast-1 249ms