Explore Johannesburg, South Africa to Miami, USA ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.

🇿🇦 Johannesburg, South Africa (JNB) → 🇺🇸 Miami, USA (MIA)

Measurement round: 2026-08-16T04:07:28Z.

Johannesburg to Miami averaged 259.9 ms, compared with a 126.78 ms city-centre fiber reference. The difference cannot be assigned to a particular cable or carrier from RTT alone.

Standard deviation was 5.02 ms, or 1.9% of the average. This describes variation within the sample without identifying its cause.

Latency Summary

Metric	Value
RTT	259.9 ms
Jitter	4.08 ms
Packet Loss	0%
Standard Fiber Floor	126.78 ms
Fiber Efficiency	48.8%
Latency Tier	High
Source Region	Africa
Destination Region	North America

Ping Measurement Series

50 ICMP echo probes were recorded in this round. Individual replies and their distribution are shown below.

Ping series: JNB → MIA

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 259.9 ± 0.71 ms (SE)

Sample distribution: box = interquartile range (256.5–262.2 ms), median 258.2 ms · whiskers = min–max · diamond = round average · each dot is one measured sample.

How to read this chart

The shaded band spans the measured minimum to maximum RTT of all samples collected up to that point, and the thin line traces the running average. The final position therefore matches the round statistics exactly. The band only widens when a new extreme sample arrives.

The dashed line is the round average, and the shaded band at the bottom is the theoretical fiber-optic floor (126.8 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	252.44
2	100	253.44
3	200	255.23
4	300	254.35
5	400	256.70
6	500	257.61
7	600	257.98
8	700	261.59
9	800	257.64
10	900	261.85
11	1000	264.50
12	1100	260.01
13	1200	256.57
14	1300	255.23
15	1400	257.43
16	1500	254.95
17	1600	267.34
18	1700	262.18
19	1800	258.18
20	1900	254.50
21	2000	260.64
22	2100	258.14
23	2200	257.07
24	2300	257.98
25	2400	254.43
26	2500	255.02
27	2600	255.74
28	2700	255.44
29	2800	268.27
30	2900	262.07
31	3000	266.43
32	3100	275.29
33	3200	262.91
34	3300	259.26
35	3400	258.37
36	3500	260.81
37	3600	256.50
38	3700	269.51
39	3800	261.31
40	3900	271.74
41	4000	270.28
42	4100	262.62
43	4200	263.66
44	4300	259.01
45	4400	255.95
46	4500	257.04
47	4600	257.79
48	4700	262.82
49	4800	256.96
50	4900	262.22

Download This Route's Data

Download the probe round as CSV, JSON or YAML under CC BY 4.0. Citation details include the route and round timestamp.

CSV JSON YAML Full dataset

Theoretical Fiber Latency

The propagation model uses public city-centre coordinates from GeoNames: Johannesburg (-26.20227, 28.04363) and Miami (25.77427, -80.19366). These are not facility coordinates or a surveyed cable path.

Physical Reference	Value
WGS-84 geodesic distance	12,945.8 km
Vacuum RTT floor	86.36 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	126.78 ms
Low-latency fiber material floor	126.27 ms
Engineering floor (5% path allowance)	133.13 ms
Research 1.33× mapped-fiber reference	168.61 ms
Estimated unamplified path loss	2718.6 dB
Transparent optical spans / inline amplifiers	170 / 169
Published RTT inflation over fiber floor	2.05×

The span count assumes 80 km optical spans. Attenuation is a power-loss term, not a propagation delay. See the model assumptions and equations.

Stability & Trend

Statistics from the same 50 replies. They describe this probe round, not continuous historical monitoring.

Round Statistic	Value
Minimum RTT	252.44 ms
Average RTT	259.9 ms
Maximum RTT	275.29 ms
Standard deviation	5.02 ms
Stdev / average	1.9%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 259.4 ms
Minimum: 257.2 ms
Maximum: 262.7 ms
Average loss: 0.02%

Route Context

Departure PoP: Johannesburg (JNB)
Destination PoP: Miami (MIA)
Region overview: Africa → North America
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Miami to Johannesburg latency and RTT: 259.8 ms

Fastest routes departing Johannesburg (JNB)

Johannesburg to London latency and RTT: 158 ms
Johannesburg to Amsterdam latency and RTT: 163.2 ms
Johannesburg to Paris latency and RTT: 164.4 ms
Johannesburg to Frankfurt latency and RTT: 166 ms
Johannesburg to Marseille latency and RTT: 172 ms

Fastest routes arriving at Miami (MIA)

Ashburn to Miami latency and RTT: 27.4 ms
New York to Miami latency and RTT: 32.9 ms
Los Angeles to Miami latency and RTT: 57.3 ms
São Paulo to Miami latency and RTT: 74 ms
Seattle to Miami latency and RTT: 81.7 ms

Same corridor (Africa → North America)

Johannesburg to New York latency and RTT: 221.8 ms
Johannesburg to Ashburn latency and RTT: 229 ms
Johannesburg to Seattle latency and RTT: 281.2 ms

About This Measurement

These ICMP measurements cover the two backbone endpoints. Access networks, routing policy and load can change an end user's result. A probe round is not an SLA.

The underlying replies are available under CC BY 4.0 in the Hats Network latency dataset. Per-pair files are available at /opendata/latency/latest/pairs/jnb-mia.pings.{csv,json,yaml}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Johannesburg → Miami round 2026-08-16T04:07:28Z, CC BY 4.0".

Round published August 16, 2026. See the full interactive latency matrix or browse more city-pair routes.

Johannesburg, South Africa → Miami, USA RTT