# Sydney, Australia → Ashburn, USA RTT

🇦🇺 **Sydney, Australia (SYD)** → 🇺🇸 **Ashburn, USA (IAD)**

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

At 2026-08-16T04:07:28Z, the ICMP echo path from Sydney to Ashburn averaged 195.3 ms over 50 samples sent every 100 ms. The minimum RTT was 186.39 ms, the maximum 216.22 ms, and packet loss was zero.

This Sydney–Ashburn route ranks 10th by average RTT among the 19 outgoing paths in this round. Its variability is slightly above the 3.28% median ratio for the set: standard deviation was 7.74 ms and jitter 6.41 ms, a spread of roughly 3.96% of the average.

The geodesic distance is 15,673.1 km and the direct-fiber floor is about 153.48 ms. At 195.3 ms, the measured RTT is only 1.27 times that floor, with a fiber-efficiency score of 78.6%; the sub-200 ms average and zero packet loss make this a clean ICMP timing reference for the route.

## Latency Summary

| Metric               | Value                                                        |
| -------------------- | ------------------------------------------------------------ |
| RTT                  | **195.3 ms**                                                 |
| Jitter               | **6.41 ms**                                                  |
| Packet Loss          | **0%**                                                       |
| Standard Fiber Floor | **153.48 ms**                                                |
| Fiber Efficiency     | **78.6%**                                                    |
| 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 [Sydney](https://www.geonames.org/2147714) (-33.86785, 151.20732) 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                      | **15,673.1 km** |
| Vacuum RTT floor                              | **104.56 ms**   |
| Standard fiber RTT floor ($n_g=1.4679$)       | **153.48 ms**   |
| Low-latency fiber material floor              | **152.87 ms**   |
| Engineering floor (5% path allowance)         | **161.18 ms**   |
| Research 1.33× mapped-fiber reference         | **204.13 ms**   |
| Estimated unamplified path loss               | **3291.4 dB**   |
| Transparent optical spans / inline amplifiers | **206 / 205**   |
| Published RTT inflation over fiber floor      | **1.27×**       |

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        | **186.39 ms** |
| Average RTT        | **195.3 ms**  |
| Maximum RTT        | **216.22 ms** |
| Standard deviation | **7.74 ms**   |
| Stdev / average    | **4.0%**      |

## Route Context

* Departure PoP: [Sydney (SYD)](/docs/network/latency/syd-sydney)
* 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 Sydney latency and RTT](/docs/network/latency/pairs/iad-syd-rtt) — 193.6 ms

**Fastest routes departing Sydney (SYD)**

* [Sydney to Melbourne latency and RTT](/docs/network/latency/pairs/syd-mel-rtt) — 9.8 ms
* [Sydney to Singapore latency and RTT](/docs/network/latency/pairs/syd-sin-rtt) — 94.5 ms
* [Sydney to Tokyo latency and RTT](/docs/network/latency/pairs/syd-tyo-rtt) — 101.3 ms
* [Sydney to Taipei latency and RTT](/docs/network/latency/pairs/syd-tpe-rtt) — 131.7 ms
* [Sydney to Hong Kong latency and RTT](/docs/network/latency/pairs/syd-hkg-rtt) — 135.7 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/syd-iad.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Sydney → 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/syd-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.