# Hong Kong → Ashburn, USA RTT

🇭🇰 **Hong Kong (HKG)** → 🇺🇸 **Ashburn, USA (IAD)**

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

For the 2026-08-16T04:07:28Z measurement round, 50 ICMP echo probes from Hong Kong to Ashburn were sent at 100 ms intervals, and all probes were answered. Average RTT was 186.2 ms, with a minimum of 178.2 ms and a maximum of 209.61 ms.

With an 8.04 ms standard deviation and 5.28 ms jitter, this route falls in the Fair latency tier. It ranks sixteenth among the 19 outbound routes from Hong Kong measured in this round, and its variation coefficient is above the 3.28 percent median for that set, so the RTT spread is wider than typical.

The route spans 13,108.8 km along the great circle, and its theoretical fiber-floor RTT is 128.37 ms. The observed average is 1.45 times that floor, giving a fiber efficiency of 68.9 percent. The 31.41 ms difference between minimum and maximum is a useful reminder that ICMP RTT is a network-layer signal, not a fixed value or an end-user performance predictor.

## Latency Summary

| Metric               | Value                                                        |
| -------------------- | ------------------------------------------------------------ |
| RTT                  | **186.2 ms**                                                 |
| Jitter               | **5.28 ms**                                                  |
| Packet Loss          | **0%**                                                       |
| Standard Fiber Floor | **128.37 ms**                                                |
| Fiber Efficiency     | **68.9%**                                                    |
| Latency Tier         | Fair                                                         |
| Source Region        | [Asia Pacific](/docs/network/latency/regions/asia-pacific)   |
| Destination Region   | [North America](/docs/network/latency/regions/north-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 [Ashburn](https://www.geonames.org/4744870) (39.04372, -77.48749). It does not disclose either facility address.

| Physical Reference                            | Value           |
| --------------------------------------------- | --------------- |
| WGS-84 geodesic distance                      | **13,108.8 km** |
| Vacuum RTT floor                              | **87.45 ms**    |
| Standard fiber RTT floor ($n_g=1.4679$)       | **128.37 ms**   |
| Low-latency fiber material floor              | **127.86 ms**   |
| Engineering floor (5% path allowance)         | **134.81 ms**   |
| Research 1.33× mapped-fiber reference         | **170.73 ms**   |
| Estimated unamplified path loss               | **2752.9 dB**   |
| Transparent optical spans / inline amplifiers | **173 / 172**   |
| Published RTT inflation over fiber floor      | **1.45×**       |

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        | **178.2 ms**  |
| Average RTT        | **186.2 ms**  |
| Maximum RTT        | **209.61 ms** |
| Standard deviation | **8.04 ms**   |
| Stdev / average    | **4.3%**      |

## Route Context

* Departure PoP: [Hong Kong (HKG)](/docs/network/latency/hkg-hong-kong)
* Destination PoP: [Ashburn (IAD)](/docs/network/latency/iad-ashburn)
* Region overview: [Asia Pacific](/docs/network/latency/regions/asia-pacific) → [North America](/docs/network/latency/regions/north-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**

* [Ashburn to Hong Kong latency and RTT](/docs/network/latency/pairs/iad-hkg-rtt) — 187.2 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 Ashburn (IAD)**

* [New York to Ashburn latency and RTT](/docs/network/latency/pairs/nyc-iad-rtt) — 6 ms
* [Miami to Ashburn latency and RTT](/docs/network/latency/pairs/mia-iad-rtt) — 27.3 ms
* [Los Angeles to Ashburn latency and RTT](/docs/network/latency/pairs/lax-iad-rtt) — 60.4 ms
* [Seattle to Ashburn latency and RTT](/docs/network/latency/pairs/sea-iad-rtt) — 61.5 ms
* [London to Ashburn latency and RTT](/docs/network/latency/pairs/lon-iad-rtt) — 71 ms

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

* [Tokyo to Seattle latency and RTT](/docs/network/latency/pairs/tyo-sea-rtt) — 84.8 ms
* [Tokyo to Los Angeles latency and RTT](/docs/network/latency/pairs/tyo-lax-rtt) — 101.2 ms
* [Taipei to Seattle latency and RTT](/docs/network/latency/pairs/tpe-sea-rtt) — 115.8 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-iad.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 → Ashburn 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-iad-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.