# Johannesburg, South Africa → Singapore RTT

🇿🇦 **Johannesburg, South Africa (JNB)** → 🇸🇬 **Singapore (SIN)**

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

Johannesburg to Singapore averaged 311.6 ms, compared with a 84.85 ms city-centre fiber reference. The difference cannot be assigned to a particular cable or carrier from RTT alone.

Standard deviation was 9.83 ms, or 3.2% of the average. This describes variation within the sample without identifying its cause.

## Latency Summary

| Metric               | Value                                                      |
| -------------------- | ---------------------------------------------------------- |
| RTT                  | **311.6 ms**                                               |
| Jitter               | **7.03 ms**                                                |
| Packet Loss          | **0%**                                                     |
| Standard Fiber Floor | **84.85 ms**                                               |
| Fiber Efficiency     | **27.2%**                                                  |
| Latency Tier         | High                                                       |
| Source Region        | [Africa](/docs/network/latency/regions/africa)             |
| Destination Region   | [Asia Pacific](/docs/network/latency/regions/asia-pacific) |

## Ping Measurement Series

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

## Download This Route's Data

Download the probe round as CSV, JSON or YAML under CC BY 4.0. [Citation details](#about-this-measurement) include the route and round timestamp.

## Theoretical Fiber Latency

The propagation model uses public city-centre coordinates from GeoNames: [Johannesburg](https://www.geonames.org/993800) (-26.20227, 28.04363) and [Singapore](https://www.geonames.org/1880252) (1.28967, 103.85007). These are not facility coordinates or a surveyed cable path.

| Physical Reference                            | Value          |
| --------------------------------------------- | -------------- |
| WGS-84 geodesic distance                      | **8,664.2 km** |
| Vacuum RTT floor                              | **57.8 ms**    |
| Standard fiber RTT floor ($n_g=1.4679$)       | **84.85 ms**   |
| Low-latency fiber material floor              | **84.51 ms**   |
| Engineering floor (5% path allowance)         | **89.1 ms**    |
| Research 1.33× mapped-fiber reference         | **112.85 ms**  |
| Estimated unamplified path loss               | **1819.5 dB**  |
| Transparent optical spans / inline amplifiers | **114 / 113**  |
| Published RTT inflation over fiber floor      | **3.67×**      |

The span count assumes 80 km optical spans. Attenuation is a power-loss term, not a propagation delay. See the [model assumptions and equations](/docs/network/latency/theoretical-fiber-latency).

## Stability & Trend

Statistics from the same 50 replies. They describe this probe round, not continuous historical monitoring.

| Round Statistic    | Value         |
| ------------------ | ------------- |
| Minimum RTT        | **301.09 ms** |
| Average RTT        | **311.6 ms**  |
| Maximum RTT        | **347.05 ms** |
| Standard deviation | **9.83 ms**   |
| Stdev / average    | **3.2%**      |

## Route Context

* Departure PoP: [Johannesburg (JNB)](/docs/network/latency/jnb-johannesburg)
* Destination PoP: [Singapore (SIN)](/docs/network/latency/sin-singapore)
* Region overview: [Africa](/docs/network/latency/regions/africa) → [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**

* [Singapore to Johannesburg latency and RTT](/docs/network/latency/pairs/sin-jnb-rtt): 312.6 ms

**Fastest routes departing Johannesburg (JNB)**

* [Johannesburg to London latency and RTT](/docs/network/latency/pairs/jnb-lon-rtt): 158 ms
* [Johannesburg to Amsterdam latency and RTT](/docs/network/latency/pairs/jnb-ams-rtt): 163.2 ms
* [Johannesburg to Paris latency and RTT](/docs/network/latency/pairs/jnb-par-rtt): 164.4 ms
* [Johannesburg to Frankfurt latency and RTT](/docs/network/latency/pairs/jnb-fra-rtt): 166 ms
* [Johannesburg to Marseille latency and RTT](/docs/network/latency/pairs/jnb-mrs-rtt): 172 ms

**Fastest routes arriving at Singapore (SIN)**

* [Hong Kong to Singapore latency and RTT](/docs/network/latency/pairs/hkg-sin-rtt): 31.5 ms
* [Taipei to Singapore latency and RTT](/docs/network/latency/pairs/tpe-sin-rtt): 44.3 ms
* [Tokyo to Singapore latency and RTT](/docs/network/latency/pairs/tyo-sin-rtt): 69.4 ms
* [Melbourne to Singapore latency and RTT](/docs/network/latency/pairs/mel-sin-rtt): 88.4 ms
* [Sydney to Singapore latency and RTT](/docs/network/latency/pairs/syd-sin-rtt): 94.5 ms

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

* [Johannesburg to Hong Kong latency and RTT](/docs/network/latency/pairs/jnb-hkg-rtt): 318 ms
* [Johannesburg to Taipei latency and RTT](/docs/network/latency/pairs/jnb-tpe-rtt): 329.8 ms
* [Johannesburg to Tokyo latency and RTT](/docs/network/latency/pairs/jnb-tyo-rtt): 360.5 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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/jnb-sin.pings.{csv,json,yaml}`. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Johannesburg → Singapore round 2026-08-16T04:07:28Z, CC BY 4.0".

***

*Round published August 16, 2026. See the [full interactive latency matrix](/docs/network/latency) or browse more [city-pair routes](/docs/network/latency/pairs).*

---

## License and attribution

- **Canonical source:** [View the human-readable HTML page](https://hatsnet.io/docs/network/latency/pairs/jnb-sin-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.