ICMP RTT data for the Johannesburg, South Africa, to Miami, USA, route: average latency, jitter, loss, and efficiency for the 2026-08-16 round.

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

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

Round 2026-08-16T04:07:28Z recorded ICMP echo RTT from Johannesburg, South Africa, to Miami, USA, across 50 samples. The average RTT was 259.9 ms, with a tight range from 252.44 ms to 275.29 ms and no packet loss, placing it in the high latency tier.

At a geodesic distance of 12,945.8 km, the vacuum floor is 86.36 ms and the fiber floor is 126.78 ms. The measured average is about 2.05 times the fiber floor, corresponding to a fiber efficiency of 48.8%, with a standard deviation of 5.02 ms and jitter of 4.08 ms.

This was one of 19 outbound routes from Johannesburg in the round, ranked 10th by average RTT. Variability around 1.9% of the average is well below the network-wide median of 3.28%, and a 22.85 ms maximum-minimum spread shows a stable RTT distribution on this path.

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

The chart below renders the 50-sample ICMP echo measurement round for this route; an accessible table of every sample is included with the chart.

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

This route's measurement round is published as open data (CC BY 4.0) in CSV, JSON, and YAML. See About This Measurement for citation guidance.

Download this dataset

Per-route ICMP ping series, released under CC BY 4.0. Uncompressed plain text — no decompression step needed.

CSV JSON YAML Full dataset

Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for Johannesburg (-26.20227, 28.04363) and Miami (25.77427, -80.19366). It does not disclose either facility address.

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×

Attenuation is used to estimate the number of 80 km optical spans; it does not directly slow light. See the full theoretical fiber latency, GeoNames, attenuation, and amplifier methodology.

Stability & Trend

The current measurement round (2026-08-16T04:07:28Z) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

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%

RTT trend

Estimated route stability across the selected time window.

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

Published RTT reflects best-case backbone path behavior measured with ICMP echo probes between PoPs. End-user latency also depends on local access networks, congestion, routing policy, and traffic engineering. None of these values is an SLA.

The measurement round behind this page is published as open data 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}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Johannesburg → Miami round 2026-08-16T04:07:28Z, CC BY 4.0".

Data auto-generated on August 16, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Johannesburg, South Africa → Miami, USA RTT