Ashburn to Tokyo Latency, Ping & RTT | AS203314
Ashburn to Tokyo ping and RTT: 150.9 ms, 1.14 ms jitter, 106.69 ms fiber floor, and 70.7% efficiency across AS203314. Updated 2026-07-19.
🇺🇸 This page compares the published ping and round-trip time (RTT) from Ashburn (IAD) to 🇯🇵 Tokyo (TYO) with vacuum and optical-fiber physical limits.
Latency Summary
| Metric | Value |
|---|---|
| RTT | 150.9 ms |
| Jitter | 1.14 ms |
| Packet Loss | 0.16% |
| Standard Fiber Floor | 106.69 ms |
| Fiber Efficiency | 70.7% |
| Latency Tier | Fair |
| Source Region | North America |
| Destination Region | Asia Pacific |
Theoretical Fiber Latency
The public physical reference uses the GeoNames city centres for Ashburn (39.04372, -77.48749) and Tokyo (35.68950, 139.69171). It does not disclose either facility address.
| Physical Reference | Value |
|---|---|
| WGS-84 geodesic distance | 10,894.6 km |
| Vacuum RTT floor | 72.68 ms |
| Standard fiber RTT floor () | 106.69 ms |
| Low-latency fiber material floor | 106.26 ms |
| Engineering floor (5% path allowance) | 112.04 ms |
| Research 1.33× mapped-fiber reference | 141.9 ms |
| Estimated unamplified path loss | 2287.9 dB |
| Transparent optical spans / inline amplifiers | 143 / 142 |
| Published RTT inflation over fiber floor | 1.41× |
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.
Stability & Trend
The following estimated indicators summarize route stability for the current publication period and are intended for comparative planning rather than SLA evaluation.
| Stability Indicator | Value |
|---|---|
| Minimum RTT | 149.7 ms |
| Median RTT (p50) | 150.8 ms |
| 95th percentile RTT (p95) | 152.8 ms |
| Maximum RTT | 153.1 ms |
| Jitter | 1.14 ms |
| Packet loss | 0.16% |
RTT trend
Estimated route stability across the selected time window.
- Average
- 150.8 ms
- Minimum
- 149.5 ms
- Maximum
- 152.4 ms
- Average loss
- 0.03%
Route Context
- Departure PoP: Ashburn (IAD)
- Destination PoP: Tokyo (TYO)
- Region overview: North America → Asia Pacific
- Full global matrix: Backbone Latency Matrix
- Physical methodology: Theoretical Fiber Latency
Related City-Pair Routes
- Reverse direction: Tokyo to Ashburn latency and RTT — 149.4 ms
- Ashburn to New York latency and RTT — 6 ms
- Ashburn to Miami latency and RTT — 33.5 ms
- Ashburn to Los Angeles latency and RTT — 59.7 ms
- Ashburn to Seattle latency and RTT — 61.8 ms
- Ashburn to London latency and RTT — 71.1 ms
About This Measurement
Published RTT reflects best-case backbone path behavior. End-user latency also depends on local access networks, congestion, routing policy, and traffic engineering. Stability indicators are comparative estimates, and none of these values is an SLA.
Data auto-generated on July 19, 2026. Explore the full interactive latency matrix or browse more city-pair routes.