# Hong Kong → Sydney, Australia RTT

🇭🇰 **Hong Kong (HKG)** → 🇦🇺 **Sydney, Australia (SYD)**

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

ICMP echo RTT from Hong Kong to Sydney averaged 137.2 ms across 50 samples, with a minimum of 129.36 ms and a maximum of 162.96 ms. There was no packet loss, but jitter of 5.69 ms and a 6.53 ms standard deviation show a moderate spread in the sample.

The great-circle distance of 7,349.1 km implies a vacuum floor of 49.03 ms and a fiber floor of 71.97 ms. Observed latency is 1.91 times the fiber floor, or 52.5 percent fiber efficiency, leaving a sizeable overhead beyond the direct-fiber reference.

Among the 19 outbound routes from Hong Kong in round 2026-08-16T04:07:28Z, this path ranks sixth in RTT performance. The group's median standard deviation as a share of average RTT is 3.28 percent; at roughly 4.8 percent of its average, this route's standard deviation is above that median, so the latency is both high and a bit less steady.

Zero packet loss across all 50 samples remains a positive signal for reachability, even though round-trip time is the dominant factor on this long-haul route.

## Latency Summary

| Metric               | Value                                                      |
| -------------------- | ---------------------------------------------------------- |
| RTT                  | **137.2 ms**                                               |
| Jitter               | **5.69 ms**                                                |
| Packet Loss          | **0%**                                                     |
| Standard Fiber Floor | **71.97 ms**                                               |
| Fiber Efficiency     | **52.5%**                                                  |
| Latency Tier         | Good                                                       |
| Source Region        | [Asia Pacific](/docs/network/latency/regions/asia-pacific) |
| Destination Region   | [Asia Pacific](/docs/network/latency/regions/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.

## 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](#about-this-measurement) for citation guidance.

## Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for [Hong Kong](https://www.geonames.org/1819729) (22.27832, 114.17469) and [Sydney](https://www.geonames.org/2147714) (-33.86785, 151.20732). It does not disclose either facility address.

| Physical Reference                            | Value          |
| --------------------------------------------- | -------------- |
| WGS-84 geodesic distance                      | **7,349.1 km** |
| Vacuum RTT floor                              | **49.03 ms**   |
| Standard fiber RTT floor ($n_g=1.4679$)       | **71.97 ms**   |
| Low-latency fiber material floor              | **71.68 ms**   |
| Engineering floor (5% path allowance)         | **75.58 ms**   |
| Research 1.33× mapped-fiber reference         | **95.72 ms**   |
| Estimated unamplified path loss               | **1543.3 dB**  |
| Transparent optical spans / inline amplifiers | **97 / 96**    |
| Published RTT inflation over fiber floor      | **1.91×**      |

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](/docs/network/latency/theoretical-fiber-latency).

## 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        | **129.36 ms** |
| Average RTT        | **137.2 ms**  |
| Maximum RTT        | **162.96 ms** |
| Standard deviation | **6.53 ms**   |
| Stdev / average    | **4.8%**      |

## Route Context

* Departure PoP: [Hong Kong (HKG)](/docs/network/latency/hkg-hong-kong)
* Destination PoP: [Sydney (SYD)](/docs/network/latency/syd-sydney)
* Region overview: [Asia Pacific](/docs/network/latency/regions/asia-pacific) → [Asia Pacific](/docs/network/latency/regions/asia-pacific)
* Full global matrix: [Backbone Latency Matrix](/docs/network/latency)
* Physical methodology: [Theoretical Fiber Latency](/docs/network/latency/theoretical-fiber-latency)

## Related City-Pair Routes

**Reverse direction**

* [Sydney to Hong Kong latency and RTT](/docs/network/latency/pairs/syd-hkg-rtt) — 135.7 ms

**Fastest routes departing Hong Kong (HKG)**

* [Hong Kong to Taipei latency and RTT](/docs/network/latency/pairs/hkg-tpe-rtt) — 14.7 ms
* [Hong Kong to Singapore latency and RTT](/docs/network/latency/pairs/hkg-sin-rtt) — 31.5 ms
* [Hong Kong to Tokyo latency and RTT](/docs/network/latency/pairs/hkg-tyo-rtt) — 44.9 ms
* [Hong Kong to Moscow latency and RTT](/docs/network/latency/pairs/hkg-mow-rtt) — 118.2 ms
* [Hong Kong to Seattle latency and RTT](/docs/network/latency/pairs/hkg-sea-rtt) — 131.6 ms

**Fastest routes arriving at Sydney (SYD)**

* [Melbourne to Sydney latency and RTT](/docs/network/latency/pairs/mel-syd-rtt) — 9.8 ms
* [Singapore to Sydney latency and RTT](/docs/network/latency/pairs/sin-syd-rtt) — 94.5 ms
* [Tokyo to Sydney latency and RTT](/docs/network/latency/pairs/tyo-syd-rtt) — 101.9 ms
* [Taipei to Sydney latency and RTT](/docs/network/latency/pairs/tpe-syd-rtt) — 133.2 ms
* [Los Angeles to Sydney latency and RTT](/docs/network/latency/pairs/lax-syd-rtt) — 137.6 ms

**Same corridor (Asia Pacific → Asia Pacific)**

* [Sydney to Melbourne latency and RTT](/docs/network/latency/pairs/syd-mel-rtt) — 9.8 ms
* [Taipei to Hong Kong latency and RTT](/docs/network/latency/pairs/tpe-hkg-rtt) — 15.5 ms
* [Singapore to Hong Kong latency and RTT](/docs/network/latency/pairs/sin-hkg-rtt) — 30.8 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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/hkg-syd.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Hong Kong → Sydney round 2026-08-16T04:07:28Z, CC BY 4.0".

***

*Data auto-generated on August 16, 2026. Explore the [full interactive latency matrix](/docs/network/latency) or browse more [city-pair routes](/docs/network/latency/pairs).*

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## License and attribution

- **Canonical source:** [View the human-readable HTML page](https://hatsnet.io/docs/network/latency/pairs/hkg-syd-rtt).
- **Original documentation:** © Hats Network Inc., licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
- **Public latency data:** © Hats Network Inc., licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
- **Full terms:** [Content and Data License](https://hatsnet.io/docs/legal/content-and-data-license) — includes attribution requirements, third-party material, trademarks, source code and other exclusions.