Seattle to Marseille Latency, Ping & RTT | AS203314
Seattle to Marseille ping and RTT: 139.5 ms, 0.64 ms jitter, 85.27 ms fiber floor, and 61.1% efficiency across AS203314. Updated 2026-07-19.
🇺🇸 This page compares the published ping and round-trip time (RTT) from Seattle (SEA) to 🇫🇷 Marseille (MRS) with vacuum and optical-fiber physical limits.
Latency Summary
| Metric | Value |
|---|---|
| RTT | 139.5 ms |
| Jitter | 0.64 ms |
| Packet Loss | 0.09% |
| Standard Fiber Floor | 85.27 ms |
| Fiber Efficiency | 61.1% |
| Latency Tier | Good |
| Source Region | North America |
| Destination Region | Europe |
Theoretical Fiber Latency
The public physical reference uses the GeoNames city centres for Seattle (47.60621, -122.33207) and Marseille (43.29695, 5.38107). It does not disclose either facility address.
| Physical Reference | Value |
|---|---|
| WGS-84 geodesic distance | 8,707.5 km |
| Vacuum RTT floor | 58.09 ms |
| Standard fiber RTT floor () | 85.27 ms |
| Low-latency fiber material floor | 84.93 ms |
| Engineering floor (5% path allowance) | 89.55 ms |
| Research 1.33× mapped-fiber reference | 113.41 ms |
| Estimated unamplified path loss | 1828.6 dB |
| Transparent optical spans / inline amplifiers | 115 / 114 |
| Published RTT inflation over fiber floor | 1.64× |
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 | 138.7 ms |
| Median RTT (p50) | 139.4 ms |
| 95th percentile RTT (p95) | 140.5 ms |
| Maximum RTT | 140.7 ms |
| Jitter | 0.64 ms |
| Packet loss | 0.09% |
RTT trend
Estimated route stability across the selected time window.
- Average
- 139.5 ms
- Minimum
- 138.4 ms
- Maximum
- 140.5 ms
- Average loss
- 0.03%
Route Context
- Departure PoP: Seattle (SEA)
- Destination PoP: Marseille (MRS)
- Region overview: North America → Europe
- Full global matrix: Backbone Latency Matrix
- Physical methodology: Theoretical Fiber Latency
Related City-Pair Routes
- Reverse direction: Marseille to Seattle latency and RTT — 139.7 ms
- Seattle to Los Angeles latency and RTT — 27.1 ms
- Seattle to New York latency and RTT — 59.1 ms
- Seattle to Ashburn latency and RTT — 61.8 ms
- Seattle to Miami latency and RTT — 81.1 ms
- Seattle to Tokyo latency and RTT — 84 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.