New York to London Latency, Ping & RTT | AS203314
New York to London ping and RTT: 64.2 ms, 0.7 ms jitter, 54.69 ms fiber floor, and 85.2% efficiency across AS203314. Updated 2026-07-19.
🇺🇸 This page compares the published ping and round-trip time (RTT) from New York (NYC) to 🇬🇧 London (LON) with vacuum and optical-fiber physical limits.
Latency Summary
| Metric | Value |
|---|---|
| RTT | 64.2 ms |
| Jitter | 0.7 ms |
| Packet Loss | 0% |
| Standard Fiber Floor | 54.69 ms |
| Fiber Efficiency | 85.2% |
| Latency Tier | Excellent |
| Source Region | North America |
| Destination Region | Europe |
Theoretical Fiber Latency
The public physical reference uses the GeoNames city centres for New York City (40.71427, -74.00597) and London (51.50853, -0.12574). It does not disclose either facility address.
| Physical Reference | Value |
|---|---|
| WGS-84 geodesic distance | 5,585.2 km |
| Vacuum RTT floor | 37.26 ms |
| Standard fiber RTT floor () | 54.69 ms |
| Low-latency fiber material floor | 54.48 ms |
| Engineering floor (5% path allowance) | 57.44 ms |
| Research 1.33× mapped-fiber reference | 72.74 ms |
| Estimated unamplified path loss | 1172.9 dB |
| Transparent optical spans / inline amplifiers | 74 / 73 |
| Published RTT inflation over fiber floor | 1.17× |
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 | 63.5 ms |
| Median RTT (p50) | 64.1 ms |
| 95th percentile RTT (p95) | 65.4 ms |
| Maximum RTT | 65.6 ms |
| Jitter | 0.7 ms |
| Packet loss | 0% |
RTT trend
Estimated route stability across the selected time window.
- Average
- 64.3 ms
- Minimum
- 63.7 ms
- Maximum
- 64.8 ms
- Average loss
- 0.01%
Route Context
- Departure PoP: New York (NYC)
- Destination PoP: London (LON)
- Region overview: North America → Europe
- Full global matrix: Backbone Latency Matrix
- Physical methodology: Theoretical Fiber Latency
Related City-Pair Routes
- Reverse direction: London to New York latency and RTT — 64.2 ms
- New York to Ashburn latency and RTT — 6 ms
- New York to Miami latency and RTT — 39.4 ms
- New York to Los Angeles latency and RTT — 58.3 ms
- New York to Seattle latency and RTT — 58.8 ms
- New York to Paris latency and RTT — 68.6 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.