Explore London, UK to Melbourne, Australia ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.

🇬🇧 London, UK (LON) → 🇦🇺 Melbourne, Australia (MEL)

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

London to Melbourne averaged 249.6 ms across 50 replies. The observed range was 242.04 to 269.23 ms; these figures describe one probe round, not a long-term service target.

Standard deviation was 5.89 ms, or 2.4% of the average. This describes variation within the sample without identifying its cause.

Latency Summary

Metric	Value
RTT	249.6 ms
Jitter	4.83 ms
Packet Loss	0%
Standard Fiber Floor	165.48 ms
Fiber Efficiency	66.3%
Latency Tier	Fair
Source Region	Europe
Destination Region	Asia Pacific

Ping Measurement Series

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

Ping series: LON → MEL

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 249.6 ± 0.83 ms (SE)

Sample distribution: box = interquartile range (245.5–252.2 ms), median 248.3 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 (165.5 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	242.39
2	100	244.53
3	200	244.11
4	300	246.18
5	400	252.50
6	500	250.00
7	600	254.92
8	700	257.67
9	800	260.12
10	900	261.59
11	1000	249.30
12	1100	247.37
13	1200	246.73
14	1300	243.77
15	1400	243.90
16	1500	242.91
17	1600	242.04
18	1700	242.98
19	1800	264.18
20	1900	255.41
21	2000	249.66
22	2100	246.02
23	2200	246.50
24	2300	269.23
25	2400	251.46
26	2500	253.69
27	2600	247.92
28	2700	247.28
29	2800	249.45
30	2900	248.33
31	3000	244.50
32	3100	257.91
33	3200	248.55
34	3300	248.58
35	3400	247.61
36	3500	254.82
37	3600	248.18
38	3700	259.11
39	3800	249.60
40	3900	248.31
41	4000	245.77
42	4100	244.22
43	4200	248.52
44	4300	245.02
45	4400	249.31
46	4500	252.42
47	4600	246.06
48	4700	244.75
49	4800	249.23
50	4900	245.39

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: London (51.50853, -0.12574) and Melbourne (-37.81400, 144.96332). These are not facility coordinates or a surveyed cable path.

Physical Reference	Value
WGS-84 geodesic distance	16,898.4 km
Vacuum RTT floor	112.73 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	165.48 ms
Low-latency fiber material floor	164.82 ms
Engineering floor (5% path allowance)	173.78 ms
Research 1.33× mapped-fiber reference	220.09 ms
Estimated unamplified path loss	3548.7 dB
Transparent optical spans / inline amplifiers	222 / 221
Published RTT inflation over fiber floor	1.51×

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	242.04 ms
Average RTT	249.6 ms
Maximum RTT	269.23 ms
Standard deviation	5.89 ms
Stdev / average	2.4%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 249.4 ms
Minimum: 247.3 ms
Maximum: 251.8 ms
Average loss: 0.02%

Route Context

Departure PoP: London (LON)
Destination PoP: Melbourne (MEL)
Region overview: Europe → Asia Pacific
Corridor overview: Europe to Asia Pacific
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Melbourne to London latency and RTT: 252 ms

Fastest routes departing London (LON)

London to Amsterdam latency and RTT: 5.2 ms
London to Paris latency and RTT: 6.4 ms
London to Frankfurt latency and RTT: 13.6 ms
London to Berlin latency and RTT: 16.2 ms
London to Marseille latency and RTT: 17.9 ms

Fastest routes arriving at Melbourne (MEL)

Sydney to Melbourne latency and RTT: 9.8 ms
Singapore to Melbourne latency and RTT: 88.6 ms
Tokyo to Melbourne latency and RTT: 113.9 ms
Hong Kong to Melbourne latency and RTT: 138.4 ms
Taipei to Melbourne latency and RTT: 142 ms

Same corridor (Europe → Asia Pacific)

Moscow to Hong Kong latency and RTT: 118.6 ms
Moscow to Taipei latency and RTT: 132.1 ms
Marseille to Singapore latency and RTT: 139.6 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/lon-mel.pings.{csv,json,yaml}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, London → Melbourne 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.

London, UK → Melbourne, Australia RTT