Tokyo, Japan to Sydney, Australia ICMP RTT measurements: 101.9 ms average round-trip time, 0% packet loss, jitter, and route context.

🇯🇵 Tokyo, Japan (TYO) → 🇦🇺 Sydney, Australia (SYD)

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

For measurement round 2026-08-16T04:07:28Z, the ICMP echo RTT from Tokyo, Japan to Sydney averages 101.9 ms, with samples from 97.82 ms to 112.89 ms.

It is the sixth-fastest of the 19 outbound routes measured from Tokyo in this round. The 3.32 ms standard deviation is about 3.3% of the average, closely matching the 3.28% median standard-deviation-to-average ratio for the measured set; jitter is 3.13 ms and packet loss is 0%.

The average is 1.34 times the estimated fiber-floor time of 76.31 ms, leaving the route at roughly 74.9% fiber efficiency over the 7,793 km trans-Pacific path. Zero packet loss and a Good latency tier indicate a stable route despite the larger absolute RTT.

Latency Summary

Metric	Value
RTT	101.9 ms
Jitter	3.13 ms
Packet Loss	0%
Standard Fiber Floor	76.31 ms
Fiber Efficiency	74.9%
Latency Tier	Good
Source Region	Asia Pacific
Destination Region	Asia Pacific

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: TYO → SYD

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 101.9 ± 0.47 ms (SE)

Sample distribution: box = interquartile range (99.6–103.4 ms), median 101.0 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 (76.3 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	103.56
2	100	99.89
3	200	98.62
4	300	101.20
5	400	100.69
6	500	105.35
7	600	100.96
8	700	103.33
9	800	99.59
10	900	103.09
11	1000	99.96
12	1100	101.68
13	1200	99.20
14	1300	99.69
15	1400	102.56
16	1500	103.85
17	1600	103.47
18	1700	100.90
19	1800	99.36
20	1900	100.24
21	2000	98.64
22	2100	98.55
23	2200	98.71
24	2300	100.43
25	2400	112.89
26	2500	104.32
27	2600	100.56
28	2700	101.97
29	2800	100.57
30	2900	99.13
31	3000	102.48
32	3100	104.02
33	3200	111.33
34	3300	103.30
35	3400	100.99
36	3500	108.22
37	3600	101.44
38	3700	102.17
39	3800	99.25
40	3900	99.02
41	4000	98.14
42	4100	97.82
43	4200	103.36
44	4300	111.93
45	4400	103.88
46	4500	101.04
47	4600	99.15
48	4700	103.71
49	4800	100.51
50	4900	100.28

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 Tokyo (35.68950, 139.69171) and Sydney (-33.86785, 151.20732). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	7,792.8 km
Vacuum RTT floor	51.99 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	76.31 ms
Low-latency fiber material floor	76.01 ms
Engineering floor (5% path allowance)	80.14 ms
Research 1.33× mapped-fiber reference	101.5 ms
Estimated unamplified path loss	1636.5 dB
Transparent optical spans / inline amplifiers	103 / 102
Published RTT inflation over fiber floor	1.34×

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	97.82 ms
Average RTT	101.9 ms
Maximum RTT	112.89 ms
Standard deviation	3.32 ms
Stdev / average	3.3%

RTT trend

Estimated route stability across the selected time window.

Average: 102.1 ms
Minimum: 101.2 ms
Maximum: 102.8 ms
Average loss: 0.03%

Route Context

Departure PoP: Tokyo (TYO)
Destination PoP: Sydney (SYD)
Region overview: Asia Pacific → Asia Pacific
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Sydney to Tokyo latency and RTT — 101.3 ms

Fastest routes departing Tokyo (TYO)

Tokyo to Taipei latency and RTT — 32.3 ms
Tokyo to Hong Kong latency and RTT — 44.8 ms
Tokyo to Singapore latency and RTT — 69.4 ms
Tokyo to Seattle latency and RTT — 84.8 ms
Tokyo to Los Angeles latency and RTT — 101.2 ms

Fastest routes arriving at Sydney (SYD)

Melbourne to Sydney latency and RTT — 9.8 ms
Singapore to Sydney latency and RTT — 94.5 ms
Taipei to Sydney latency and RTT — 133.2 ms
Hong Kong to Sydney latency and RTT — 137.2 ms
Los Angeles to Sydney latency and RTT — 137.6 ms

Same corridor (Asia Pacific → Asia Pacific)

Sydney to Melbourne latency and RTT — 9.8 ms
Hong Kong to Taipei latency and RTT — 14.7 ms
Taipei to Hong Kong latency and RTT — 15.5 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/tyo-syd.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Tokyo → Sydney 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.

Tokyo, Japan → Sydney, Australia RTT