Tokyo to London Latency, Ping & RTT | AS203314
Tokyo to London ping and RTT: 205.1 ms, 1.99 ms jitter, 93.84 ms fiber floor, and 45.8% efficiency across AS203314. Updated 2026-07-19.
🇯🇵 This page compares the published ping and round-trip time (RTT) from Tokyo (TYO) to 🇬🇧 London (LON) with vacuum and optical-fiber physical limits.
Latency Summary
| Metric | Value |
|---|---|
| RTT | 205.1 ms |
| Jitter | 1.99 ms |
| Packet Loss | 0% |
| Standard Fiber Floor | 93.84 ms |
| Fiber Efficiency | 45.8% |
| Latency Tier | Fair |
| Source Region | Asia Pacific |
| Destination Region | Europe |
Theoretical Fiber Latency
The public physical reference uses the GeoNames city centres for Tokyo (35.68950, 139.69171) and London (51.50853, -0.12574). It does not disclose either facility address.
| Physical Reference | Value |
|---|---|
| WGS-84 geodesic distance | 9,582.1 km |
| Vacuum RTT floor | 63.93 ms |
| Standard fiber RTT floor () | 93.84 ms |
| Low-latency fiber material floor | 93.46 ms |
| Engineering floor (5% path allowance) | 98.54 ms |
| Research 1.33× mapped-fiber reference | 124.8 ms |
| Estimated unamplified path loss | 2012.2 dB |
| Transparent optical spans / inline amplifiers | 126 / 125 |
| Published RTT inflation over fiber floor | 2.19× |
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 | 202.4 ms |
| Median RTT (p50) | 204.8 ms |
| 95th percentile RTT (p95) | 208 ms |
| Maximum RTT | 209.4 ms |
| Jitter | 1.99 ms |
| Packet loss | 0% |
RTT trend
Estimated route stability across the selected time window.
- Average
- 205.1 ms
- Minimum
- 202.9 ms
- Maximum
- 207.0 ms
- Average loss
- 0.00%
Route Context
- Departure PoP: Tokyo (TYO)
- Destination PoP: London (LON)
- Region overview: Asia Pacific → Europe
- Full global matrix: Backbone Latency Matrix
- Physical methodology: Theoretical Fiber Latency
Related City-Pair Routes
- Reverse direction: London to Tokyo latency and RTT — 206.7 ms
- Tokyo to Taipei latency and RTT — 32.7 ms
- Tokyo to Hong Kong latency and RTT — 45.2 ms
- Tokyo to Singapore latency and RTT — 68.8 ms
- Tokyo to Seattle latency and RTT — 84.1 ms
- Tokyo to Los Angeles latency and RTT — 101.3 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.