I did some testing with my own Droplets and got the following data. Results could vary based on routing, Internet conditions, hypervisor load, etc., but hopefully this is a good starting point. You can use the usual grep, sort, and so on to narrow down the list.

from    to      min      avg      max      mdev
f:ams2  t:ams2  0.040    0.059    0.275    0.032
f:ams2  t:ams3  0.898    1.124    1.437    0.129
f:ams2  t:blr1  138.613  138.715  139.054  0.224
f:ams2  t:fra1  6.845    6.978    7.411    0.118
f:ams2  t:lon1  11.303   11.434   11.682   0.161
f:ams2  t:nyc1  93.167   93.299   93.732   0.322
f:ams2  t:nyc2  99.329   99.547   100.528  0.437
f:ams2  t:nyc3  78.971   79.399   80.485   0.470
f:ams2  t:sfo1  164.883  165.011  165.217  0.280
f:ams2  t:sfo2  149.449  149.659  153.752  0.700
f:ams2  t:sgp1  339.653  339.886  340.139  0.419
f:ams2  t:tor1  95.862   98.325   106.832  2.689
f:ams3  t:ams2  0.860    1.103    1.404    0.128
f:ams3  t:ams3  0.021    0.038    0.059    0.011
f:ams3  t:blr1  140.728  140.798  141.078  0.267
f:ams3  t:fra1  6.782    6.850    6.938    0.089
f:ams3  t:lon1  6.434    6.495    6.631    0.112
f:ams3  t:nyc1  100.365  100.449  100.885  0.365
f:ams3  t:nyc2  90.764   90.968   93.138   0.511
f:ams3  t:nyc3  91.280   91.378   91.769   0.335
f:ams3  t:sfo1  159.194  159.288  159.448  0.125
f:ams3  t:sfo2  151.976  154.697  183.006  5.640
f:ams3  t:sgp1  320.547  320.640  320.825  0.362
f:ams3  t:tor1  101.619  104.223  112.711  2.761
f:blr1  t:ams2  138.648  138.874  142.248  0.647
f:blr1  t:ams3  140.771  140.862  141.073  0.503
f:blr1  t:blr1  0.019    0.032    0.054    0.009
f:blr1  t:fra1  143.041  143.103  143.206  0.435
f:blr1  t:lon1  154.127  154.172  154.254  0.249
f:blr1  t:nyc1  212.354  212.420  212.621  0.481
f:blr1  t:nyc2  203.972  204.119  204.629  0.407
f:blr1  t:nyc3  210.540  210.605  210.954  0.530
f:blr1  t:sfo1  250.825  250.894  251.058  0.643
f:blr1  t:sfo2  252.730  252.811  252.939  0.673
f:blr1  t:sgp1  91.072   91.238   91.883   0.407
f:blr1  t:tor1  234.763  234.943  237.501  0.796
f:fra1  t:ams2  6.861    6.961    7.136    0.092
f:fra1  t:ams3  6.763    6.878    7.942    0.175
f:fra1  t:blr1  141.391  141.458  141.563  0.420
f:fra1  t:fra1  0.014    0.023    0.046    0.008
f:fra1  t:lon1  18.733   18.848   19.152   0.149
f:fra1  t:nyc1  81.428   81.582   86.900   0.853
f:fra1  t:nyc2  84.878   85.039   85.291   0.315
f:fra1  t:nyc3  83.103   83.180   83.275   0.379
f:fra1  t:sfo1  168.601  168.663  168.765  0.500
f:fra1  t:sfo2  168.933  169.033  169.144  0.321
f:fra1  t:sgp1  197.451  197.658  198.132  0.166
f:fra1  t:tor1  113.986  115.724  121.993  1.783
f:lon1  t:ams2  11.269   11.422   12.081   0.166
f:lon1  t:ams3  6.368    6.467    6.625    0.098
f:lon1  t:blr1  154.134  154.228  154.667  0.496
f:lon1  t:fra1  18.754   18.864   19.040   0.068
f:lon1  t:lon1  0.021    0.029    0.040    0.007
f:lon1  t:nyc1  73.517   73.590   74.071   0.352
f:lon1  t:nyc2  68.118   68.344   69.496   0.339
f:lon1  t:nyc3  74.069   74.162   74.271   0.236
f:lon1  t:sfo1  145.143  145.270  145.420  0.121
f:lon1  t:sfo2  144.158  144.304  144.928  0.418
f:lon1  t:sgp1  191.727  191.935  192.301  0.483
f:lon1  t:tor1  84.874   86.818   91.808   1.675
f:nyc1  t:ams2  93.119   93.249   93.617   0.272
f:nyc1  t:ams3  100.320  100.411  100.563  0.373
f:nyc1  t:blr1  212.300  212.367  212.605  0.323
f:nyc1  t:fra1  81.382   81.460   81.893   0.377
f:nyc1  t:lon1  73.500   73.569   73.725   0.328
f:nyc1  t:nyc1  0.024    0.031    0.039    0.008
f:nyc1  t:nyc2  0.864    1.170    10.134   1.282
f:nyc1  t:nyc3  1.442    1.559    1.977    0.096
f:nyc1  t:sfo1  77.116   77.186   77.391   0.313
f:nyc1  t:sfo2  76.255   76.331   76.640   0.207
f:nyc1  t:sgp1  252.959  253.127  253.423  0.624
f:nyc1  t:tor1  15.793   17.062   21.958   1.533
f:nyc2  t:ams2  99.349   99.618   100.861  0.406
f:nyc2  t:ams3  90.697   90.922   92.663   0.486
f:nyc2  t:blr1  205.766  205.940  207.435  0.334
f:nyc2  t:fra1  84.939   85.055   86.354   0.456
f:nyc2  t:lon1  68.154   68.250   68.603   0.164
f:nyc2  t:nyc1  0.873    1.031    2.429    0.233
f:nyc2  t:nyc2  0.035    0.057    0.167    0.019
f:nyc2  t:nyc3  1.252    1.424    1.909    0.136
f:nyc2  t:sfo1  81.272   81.415   81.760   0.365
f:nyc2  t:sfo2  78.321   78.560   81.371   0.571
f:nyc2  t:sgp1  254.019  254.156  254.399  0.283
f:nyc2  t:tor1  15.791   17.240   23.452   1.657
f:nyc3  t:ams2  78.980   79.269   80.357   0.353
f:nyc3  t:ams3  91.239   91.352   91.606   0.367
f:nyc3  t:blr1  212.248  212.320  212.539  0.311
f:nyc3  t:fra1  83.159   83.209   83.308   0.333
f:nyc3  t:lon1  74.050   74.157   74.224   0.126
f:nyc3  t:nyc1  1.488    1.556    1.724    0.042
f:nyc3  t:nyc2  1.261    1.408    1.793    0.087
f:nyc3  t:nyc3  0.019    0.033    0.065    0.008
f:nyc3  t:sfo1  79.816   79.935   80.277   0.260
f:nyc3  t:sfo2  78.820   78.946   79.381   0.335
f:nyc3  t:sgp1  250.023  250.193  251.362  0.728
f:nyc3  t:tor1  16.397   17.972   24.016   1.791
f:sfo1  t:ams2  164.892  164.995  165.116  0.448
f:sfo1  t:ams3  159.248  159.322  159.493  0.312
f:sfo1  t:blr1  251.954  252.079  252.195  0.675
f:sfo1  t:fra1  168.599  168.685  168.845  0.223
f:sfo1  t:lon1  145.206  145.298  146.816  0.526
f:sfo1  t:nyc1  77.129   77.183   77.312   0.162
f:sfo1  t:nyc2  81.313   81.543   82.325   0.402
f:sfo1  t:nyc3  79.811   79.964   81.188   0.335
f:sfo1  t:sfo1  0.019    0.042    0.079    0.010
f:sfo1  t:sfo2  1.265    1.354    1.464    0.068
f:sfo1  t:sgp1  174.157  174.284  174.428  0.380
f:sfo1  t:tor1  63.214   63.444   65.445   0.381
f:sfo2  t:ams2  149.420  149.548  149.731  0.535
f:sfo2  t:ams3  151.967  153.757  164.331  2.461
f:sfo2  t:blr1  252.702  252.860  255.059  0.740
f:sfo2  t:fra1  168.964  169.095  171.180  0.325
f:sfo2  t:lon1  144.206  144.270  144.354  0.417
f:sfo2  t:nyc1  76.254   76.326   76.534   0.329
f:sfo2  t:nyc2  78.306   78.474   79.292   0.297
f:sfo2  t:nyc3  78.862   78.955   79.141   0.376
f:sfo2  t:sfo1  1.309    1.385    1.532    0.069
f:sfo2  t:sfo2  0.024    0.031    0.043    0.005
f:sfo2  t:sgp1  169.442  169.581  169.943  0.583
f:sfo2  t:tor1  63.040   63.270   66.089   0.594
f:sgp1  t:ams2  339.717  339.905  340.043  0.429
f:sgp1  t:ams3  320.517  320.758  325.287  0.792
f:sgp1  t:blr1  91.051   91.195   91.485   0.370
f:sgp1  t:fra1  197.507  197.666  197.884  0.365
f:sgp1  t:lon1  191.816  191.983  192.141  0.246
f:sgp1  t:nyc1  252.982  253.131  253.290  0.590
f:sgp1  t:nyc2  254.122  254.275  255.251  0.477
f:sgp1  t:nyc3  250.067  250.204  250.435  0.674
f:sgp1  t:sfo1  174.089  174.256  174.436  0.432
f:sgp1  t:sfo2  169.397  169.576  169.754  0.384
f:sgp1  t:sgp1  0.021    0.049    0.086    0.017
f:sgp1  t:tor1  237.888  238.073  238.873  0.619
f:tor1  t:ams2  95.777   96.738   99.263   0.788
f:tor1  t:ams3  101.702  102.986  111.426  1.618
f:tor1  t:blr1  234.777  234.906  235.701  0.564
f:tor1  t:fra1  113.947  115.101  120.405  1.366
f:tor1  t:lon1  84.981   87.273   96.185   2.869
f:tor1  t:nyc1  15.982   19.497   29.091   2.983
f:tor1  t:nyc2  15.844   18.020   27.312   2.568
f:tor1  t:nyc3  16.439   21.813   34.928   4.558
f:tor1  t:sfo1  63.247   63.449   64.861   0.298
f:tor1  t:sfo2  62.985   63.107   63.917   0.192
f:tor1  t:sgp1  237.886  238.145  240.014  0.702
f:tor1  t:tor1  0.028    0.051    0.239    0.028