# Hong Kong → Seattle, USA RTT

🇭🇰 **Hong Kong (HKG)** → 🇺🇸 **Seattle, USA (SEA)**

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

The 2026-08-16T04:07:28Z round of ICMP echo probes from Hong Kong to Seattle returned an average round-trip time of 131.6 ms, with a minimum of 125.78 ms and a maximum of 162.34 ms. All 50 probes were answered, so packet loss was zero; jitter came to 5.03 ms and the standard deviation was 6.2 ms, placing the route in the good latency tier.

On this network's 19-outbound-route measurement set, the path ranked 5th by round-trip time, and the median variability across the set was 3.28% of the average RTT. The route's own variability is about 4.7% of its average, so it is a little less stable than the set's typical path, though the difference is modest.

The geodesic reference for this crossing is roughly 10,436 km, with a vacuum floor of 69.62 ms and a fiber floor of 102.2 ms. The measured average is only 1.29 times the fiber floor, equivalent to a fiber efficiency of 77.7%, suggesting a fairly direct trans-Pacific alignment. Zero loss and a good latency tier make this a useful reference for the round, while the 36.6 ms spread between the fastest and slowest probes still shows noticeable RTT variation.

## Latency Summary

| Metric               | Value                                                        |
| -------------------- | ------------------------------------------------------------ |
| RTT                  | **131.6 ms**                                                 |
| Jitter               | **5.03 ms**                                                  |
| Packet Loss          | **0%**                                                       |
| Standard Fiber Floor | **102.2 ms**                                                 |
| Fiber Efficiency     | **77.7%**                                                    |
| Latency Tier         | Good                                                         |
| 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 [Seattle](https://www.geonames.org/5809844) (47.60621, -122.33207). It does not disclose either facility address.

| Physical Reference                            | Value           |
| --------------------------------------------- | --------------- |
| WGS-84 geodesic distance                      | **10,435.9 km** |
| Vacuum RTT floor                              | **69.62 ms**    |
| Standard fiber RTT floor ($n_g=1.4679$)       | **102.2 ms**    |
| Low-latency fiber material floor              | **101.79 ms**   |
| Engineering floor (5% path allowance)         | **107.32 ms**   |
| Research 1.33× mapped-fiber reference         | **135.92 ms**   |
| Estimated unamplified path loss               | **2191.5 dB**   |
| Transparent optical spans / inline amplifiers | **137 / 136**   |
| Published RTT inflation over fiber floor      | **1.29×**       |

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        | **125.78 ms** |
| Average RTT        | **131.6 ms**  |
| Maximum RTT        | **162.34 ms** |
| Standard deviation | **6.2 ms**    |
| Stdev / average    | **4.7%**      |

## Route Context

* Departure PoP: [Hong Kong (HKG)](/docs/network/latency/hkg-hong-kong)
* Destination PoP: [Seattle (SEA)](/docs/network/latency/sea-seattle)
* 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**

* [Seattle to Hong Kong latency and RTT](/docs/network/latency/pairs/sea-hkg-rtt) — 130.4 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 Sydney latency and RTT](/docs/network/latency/pairs/hkg-syd-rtt) — 137.2 ms

**Fastest routes arriving at Seattle (SEA)**

* [Los Angeles to Seattle latency and RTT](/docs/network/latency/pairs/lax-sea-rtt) — 26.9 ms
* [New York to Seattle latency and RTT](/docs/network/latency/pairs/nyc-sea-rtt) — 58.7 ms
* [Ashburn to Seattle latency and RTT](/docs/network/latency/pairs/iad-sea-rtt) — 62.3 ms
* [Miami to Seattle latency and RTT](/docs/network/latency/pairs/mia-sea-rtt) — 81.9 ms
* [Tokyo to Seattle latency and RTT](/docs/network/latency/pairs/tyo-sea-rtt) — 84.8 ms

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

* [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
* [Taipei to Los Angeles latency and RTT](/docs/network/latency/pairs/tpe-lax-rtt) — 132 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-sea.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 → Seattle 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-sea-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.