Johannesburg to London ping and RTT: 158 ms, 6.99 ms jitter, 88.52 ms fiber floor, and 56% efficiency across AS203314. Updated 2026-08-10.

🇿🇦 This page compares the published ping and round-trip time (RTT) from Johannesburg (JNB) to 🇬🇧 London (LON) with vacuum and optical-fiber physical limits.

As of August 10, 2026, the Johannesburg → London route on Hats Network averages 158 ms RTT across a 50-sample daily ICMP echo measurement round, 1.78× the theoretical fiber-floor limit of 88.52 ms.

Among the 19 measured routes departing Johannesburg, this is the fastest route by average RTT.

With a stdev-to-average ratio of 4.8%, this route fluctuates more than the network median of 3.1%, so short congestion windows can surface as transient RTT spikes. Across the round, per-probe RTT ranged from 147.55 ms to 184.43 ms with a standard deviation of 7.54 ms.

Latency Summary

Metric	Value
RTT	158 ms
Jitter	6.99 ms
Packet Loss	0%
Standard Fiber Floor	88.52 ms
Fiber Efficiency	56%
Latency Tier	Fair
Source Region	Africa
Destination Region	Europe

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 → LON

50 ICMP echo samples at 100 ms intervals · round 2026-08-10 · avg 158.0 ± 1.07 ms (SE)

Sample distribution: box = interquartile range (152.7–160.6 ms), median 156.2 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 (88.5 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	160.68
2	100	153.25
3	200	156.43
4	300	160.18
5	400	154.64
6	500	161.36
7	600	153.05
8	700	156.02
9	800	167.47
10	900	168.25
11	1000	154.41
12	1100	149.43
13	1200	153.62
14	1300	159.09
15	1400	164.78
16	1500	159.07
17	1600	152.54
18	1700	158.56
19	1800	184.43
20	1900	169.67
21	2000	156.06
22	2100	154.31
23	2200	175.10
24	2300	163.88
25	2400	159.27
26	2500	158.93
27	2600	153.69
28	2700	160.40
29	2800	151.40
30	2900	149.69
31	3000	152.33
32	3100	155.31
33	3200	172.34
34	3300	159.94
35	3400	171.46
36	3500	158.57
37	3600	159.30
38	3700	153.58
39	3800	149.15
40	3900	157.13
41	4000	149.97
42	4100	147.55
43	4200	151.98
44	4300	148.31
45	4400	152.12
46	4500	155.44
47	4600	151.65
48	4700	148.46
49	4800	162.83
50	4900	162.92

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 London (51.50853, -0.12574). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	9,039.3 km
Vacuum RTT floor	60.3 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	88.52 ms
Low-latency fiber material floor	88.16 ms
Engineering floor (5% path allowance)	92.96 ms
Research 1.33× mapped-fiber reference	117.73 ms
Estimated unamplified path loss	1898.3 dB
Transparent optical spans / inline amplifiers	119 / 118
Published RTT inflation over fiber floor	1.78×

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 (2026-08-10) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

Round Statistic	Value
Minimum RTT	147.55 ms
Average RTT	158 ms
Maximum RTT	184.43 ms
Standard deviation	7.54 ms
Stdev / average	4.8%

RTT trend

Estimated route stability across the selected time window.

Average: 158.0 ms
Minimum: 156.3 ms
Maximum: 159.7 ms
Average loss: 0.03%

Route Context

Departure PoP: Johannesburg (JNB)
Destination PoP: London (LON)
Region overview: Africa → Europe
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

London to Johannesburg latency and RTT — 179.8 ms

Fastest routes departing Johannesburg (JNB)

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
Johannesburg to Berlin latency and RTT — 172.1 ms

Fastest routes arriving at London (LON)

Amsterdam to London latency and RTT — 5.2 ms
Paris to London latency and RTT — 6.4 ms
Frankfurt to London latency and RTT — 12.4 ms
Berlin to London latency and RTT — 15.8 ms
Marseille to London latency and RTT — 19.1 ms

Same corridor (Africa → Europe)

Johannesburg to Moscow latency and RTT — 201.7 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-lon.pings.{csv,json,yaml}. When citing, include the route, the measurement round date, and the dataset version — for example: "Hats Network latency dataset, Johannesburg → London round 2026-08-10, CC BY 4.0".

Data auto-generated on August 10, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Johannesburg to London Latency, Ping & RTT | AS203314