Sydney, Australia → Seattle, USA RTT
Explore Sydney, Australia to Seattle, USA ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.
🇦🇺 Sydney, Australia (SYD) → 🇺🇸 Seattle, USA (SEA)
Measurement round: 2026-10-11T10:12:58Z.
Sydney to Seattle averaged 161.1 ms, with a 156.64-173.07 ms range and no measured loss.
Sixth among 19 routes, it measured about 32% above the fiber reference. The narrow range shows limited dispersion in this sample.
Latency Summary
| Metric | Value |
|---|---|
| RTT | 161.1 ms |
| Jitter | 3.66 ms |
| Packet Loss | 0% |
| Standard Fiber Floor | 121.96 ms |
| Fiber Efficiency | 75.7% |
| Latency Tier | Fair |
| Source Region | Asia Pacific |
| Destination Region | North America |
Ping Measurement Series
50 ICMP echo probes were recorded in this round. Individual replies and their distribution are shown below.
Ping series: SYD → SEA
50 ICMP echo samples at 100 ms intervals · round 2026-10-11T10:12:58Z · avg 161.1 ± 0.52 ms (SE)
Sample distribution: box = interquartile range (158.6–162.5 ms), median 160.2 ms · whiskers = min–max · diamond = round average · each dot is one measured sample.
How to read this chart
The shaded band spans the measured minimum to maximum RTT of all samples collected up to that point, and the thin line traces the running average. The final position therefore matches the round statistics exactly. The band only widens when a new extreme sample arrives.
The dashed line is the round average, and the shaded band at the bottom is the theoretical fiber-optic floor (122.0 ms) for this route.
Full 50-sample dataset
| Seq | Offset (ms) | RTT (ms) |
|---|---|---|
| 1 | 0 | 158.98 |
| 2 | 100 | 162.18 |
| 3 | 200 | 158.25 |
| 4 | 300 | 156.94 |
| 5 | 400 | 157.47 |
| 6 | 500 | 159.92 |
| 7 | 600 | 158.49 |
| 8 | 700 | 159.08 |
| 9 | 800 | 157.48 |
| 10 | 900 | 158.80 |
| 11 | 1000 | 162.52 |
| 12 | 1100 | 160.03 |
| 13 | 1200 | 165.95 |
| 14 | 1300 | 163.05 |
| 15 | 1400 | 167.94 |
| 16 | 1500 | 160.65 |
| 17 | 1600 | 157.68 |
| 18 | 1700 | 156.64 |
| 19 | 1800 | 159.34 |
| 20 | 1900 | 156.98 |
| 21 | 2000 | 168.86 |
| 22 | 2100 | 161.14 |
| 23 | 2200 | 173.07 |
| 24 | 2300 | 161.91 |
| 25 | 2400 | 162.61 |
| 26 | 2500 | 159.29 |
| 27 | 2600 | 159.09 |
| 28 | 2700 | 163.42 |
| 29 | 2800 | 162.73 |
| 30 | 2900 | 159.65 |
| 31 | 3000 | 158.33 |
| 32 | 3100 | 172.07 |
| 33 | 3200 | 162.80 |
| 34 | 3300 | 160.32 |
| 35 | 3400 | 161.29 |
| 36 | 3500 | 158.20 |
| 37 | 3600 | 157.48 |
| 38 | 3700 | 166.46 |
| 39 | 3800 | 162.53 |
| 40 | 3900 | 160.84 |
| 41 | 4000 | 158.86 |
| 42 | 4100 | 156.95 |
| 43 | 4200 | 158.93 |
| 44 | 4300 | 160.18 |
| 45 | 4400 | 160.15 |
| 46 | 4500 | 166.12 |
| 47 | 4600 | 162.06 |
| 48 | 4700 | 158.34 |
| 49 | 4800 | 162.00 |
| 50 | 4900 | 160.95 |
Download This Route's Data
Download the probe round as CSV, JSON or YAML under CC BY 4.0. Citation details include the route and round timestamp.
Theoretical Fiber Latency
The propagation model uses public city-centre coordinates from GeoNames: Sydney (-33.86785, 151.20732) and Seattle (47.60621, -122.33207). These are not facility coordinates or a surveyed cable path.
| Physical Reference | Value |
|---|---|
| WGS-84 geodesic distance | 12,453.7 km |
| Vacuum RTT floor | 83.08 ms |
| Standard fiber RTT floor () | 121.96 ms |
| Low-latency fiber material floor | 121.47 ms |
| Engineering floor (5% path allowance) | 128.07 ms |
| Research 1.33× mapped-fiber reference | 162.2 ms |
| Estimated unamplified path loss | 2615.3 dB |
| Transparent optical spans / inline amplifiers | 164 / 163 |
| Published RTT inflation over fiber floor | 1.32× |
The span count assumes 80 km optical spans. Attenuation is a power-loss term, not a propagation delay. See the model assumptions and equations.
Stability & Trend
Statistics from the same 50 replies. They describe this probe round, not continuous historical monitoring.
| Round Statistic | Value |
|---|---|
| Minimum RTT | 156.64 ms |
| Average RTT | 161.1 ms |
| Maximum RTT | 173.07 ms |
| Standard deviation | 3.67 ms |
| Stdev / average | 2.3% |
Estimated RTT trend
Modeled comparison, not historical probe measurements.
- Average
- 161.2 ms
- Minimum
- 159.7 ms
- Maximum
- 162.7 ms
- Average loss
- 0.02%
Route Context
- Departure PoP: Sydney (SYD)
- Destination PoP: Seattle (SEA)
- Region overview: Asia Pacific → North America
- Full global matrix: Backbone Latency Matrix
- Physical methodology: Theoretical Fiber Latency
Related City-Pair Routes
Reverse direction
- Seattle to Sydney latency and RTT: 161.6 ms
Fastest routes departing Sydney (SYD)
- Sydney to Melbourne latency and RTT: 9.8 ms
- Sydney to Tokyo latency and RTT: 101.8 ms
- Sydney to Taipei latency and RTT: 131.4 ms
- Sydney to Los Angeles latency and RTT: 136.6 ms
- Sydney to Hong Kong latency and RTT: 147.2 ms
Fastest routes arriving at Seattle (SEA)
- Los Angeles to Seattle latency and RTT: 26.5 ms
- New York to Seattle latency and RTT: 59.3 ms
- Ashburn to Seattle latency and RTT: 62.8 ms
- Miami to Seattle latency and RTT: 82 ms
- Tokyo to Seattle latency and RTT: 84.5 ms
Same corridor (Asia Pacific → North America)
- Tokyo to Los Angeles latency and RTT: 100.7 ms
- Taipei to Seattle latency and RTT: 114.5 ms
- Hong Kong to Seattle latency and RTT: 129.3 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. Per-pair files are available at /opendata/latency/latest/pairs/syd-sea.pings.{csv,json,yaml}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Sydney → Seattle round 2026-10-11T10:12:58Z, CC BY 4.0".
Round published October 11, 2026. See the full interactive latency matrix or browse more city-pair routes.