# Hong Kong → São Paulo, Brazil RTT

🇭🇰 **Hong Kong (HKG)** → 🇧🇷 **São Paulo, Brazil (GRU)**

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

ICMP echo probes in the 2026-08-16T04:07:28Z round measured an average Hong Kong-to-São Paulo round-trip time of 287.6 ms, with a minimum of 276.79 ms and a maximum of 338.46 ms. The route landed in the high latency tier, while all 50 probes were answered and packet loss stayed at zero.

Across the 19 outbound paths measured on this network, the route placed 18th by round-trip time, putting it near the slower end of the set. Its standard deviation of 13.48 ms and jitter of 8.34 ms are correspondingly larger in absolute terms, though relative to the 287.6 ms average the variability is about 4.7%, slightly above the 3.28% median for the route set.

At roughly 18,060 km, this is a very long intercontinental haul, and the fiber floor is 176.86 ms. The measured average is 1.63 times that floor, or about 61.5% fiber efficiency, which points to a mostly efficient long-haul path despite the high absolute latency. With zero packet loss, the high RTT is best understood as a distance-driven feature of this round, and the 61.6 ms gap between minimum and maximum is a more noticeable source of variation.

## Latency Summary

| Metric               | Value                                                        |
| -------------------- | ------------------------------------------------------------ |
| RTT                  | **287.6 ms**                                                 |
| Jitter               | **8.34 ms**                                                  |
| Packet Loss          | **0%**                                                       |
| Standard Fiber Floor | **176.86 ms**                                                |
| Fiber Efficiency     | **61.5%**                                                    |
| Latency Tier         | High                                                         |
| Source Region        | [Asia Pacific](/docs/network/latency/regions/asia-pacific)   |
| Destination Region   | [South America](/docs/network/latency/regions/south-america) |

## 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 [São Paulo](https://www.geonames.org/3448439) (-23.54750, -46.63611). It does not disclose either facility address.

| Physical Reference                            | Value         |
| --------------------------------------------- | ------------- |
| WGS-84 geodesic distance                      | **18,060 km** |
| Vacuum RTT floor                              | **120.48 ms** |
| Standard fiber RTT floor ($n_g=1.4679$)       | **176.86 ms** |
| Low-latency fiber material floor              | **176.15 ms** |
| Engineering floor (5% path allowance)         | **185.72 ms** |
| Research 1.33× mapped-fiber reference         | **235.22 ms** |
| Estimated unamplified path loss               | **3792.6 dB** |
| Transparent optical spans / inline amplifiers | **238 / 237** |
| Published RTT inflation over fiber floor      | **1.63×**     |

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        | **276.79 ms** |
| Average RTT        | **287.6 ms**  |
| Maximum RTT        | **338.46 ms** |
| Standard deviation | **13.48 ms**  |
| Stdev / average    | **4.7%**      |

## Route Context

* Departure PoP: [Hong Kong (HKG)](/docs/network/latency/hkg-hong-kong)
* Destination PoP: [São Paulo (GRU)](/docs/network/latency/gru-sao-paulo)
* Region overview: [Asia Pacific](/docs/network/latency/regions/asia-pacific) → [South America](/docs/network/latency/regions/south-america)
* Corridor overview: [Asia Pacific to South America](/docs/network/latency/regions/asia-pacific-to-south-america)
* 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**

* [São Paulo to Hong Kong latency and RTT](/docs/network/latency/pairs/gru-hkg-rtt) — 273.5 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 São Paulo (GRU)**

* [Ashburn to São Paulo latency and RTT](/docs/network/latency/pairs/iad-gru-rtt) — 101.4 ms
* [New York to São Paulo latency and RTT](/docs/network/latency/pairs/nyc-gru-rtt) — 106.9 ms
* [Miami to São Paulo latency and RTT](/docs/network/latency/pairs/mia-gru-rtt) — 128.7 ms
* [Los Angeles to São Paulo latency and RTT](/docs/network/latency/pairs/lax-gru-rtt) — 131.3 ms
* [Seattle to São Paulo latency and RTT](/docs/network/latency/pairs/sea-gru-rtt) — 155.7 ms

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

* [Tokyo to São Paulo latency and RTT](/docs/network/latency/pairs/tyo-gru-rtt) — 230.5 ms
* [Taipei to São Paulo latency and RTT](/docs/network/latency/pairs/tpe-gru-rtt) — 273 ms
* [Sydney to São Paulo latency and RTT](/docs/network/latency/pairs/syd-gru-rtt) — 296.7 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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/hkg-gru.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 → São Paulo 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-gru-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.