Seattle to Marseille ping and RTT: 141.7 ms, 4.23 ms jitter, 85.27 ms fiber floor, and 60.2% efficiency across AS203314. Updated 2026-08-09.

🇺🇸 This page compares the published ping and round-trip time (RTT) from Seattle (SEA) to 🇫🇷 Marseille (MRS) with vacuum and optical-fiber physical limits.

As of August 9, 2026, the Seattle → Marseille route on Hats Network averages 141.7 ms RTT across a 50-sample daily ICMP echo measurement round (source: RETN), 1.66× the theoretical fiber-floor limit of 85.27 ms.

Among the 19 measured routes departing Seattle, this route ranks 13th fastest by average RTT.

With a stdev-to-average ratio of 4.2%, this route fluctuates more than the network median of 3.4%, so short congestion windows can surface as transient RTT spikes. Across the round, per-probe RTT ranged from 134.52 ms to 163.09 ms with a standard deviation of 6.02 ms.

Latency Summary

Metric	Value
RTT	141.7 ms
Jitter	4.23 ms
Packet Loss	0%
Standard Fiber Floor	85.27 ms
Fiber Efficiency	60.2%
Latency Tier	Good
Source Region	North America
Destination Region	Europe

Ping Measurement Series

The chart below renders the 50-sample ICMP echo measurement round for this route; an accessible table of every sample is included with the chart.

Ping series: SEA → MRS

50 ICMP echo samples at 100 ms intervals · round 2026-08-09 · avg 141.7 ± 0.85 ms (SE)

Sample distribution: box = interquartile range (137.2–143.4 ms), median 140.6 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 (85.3 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	134.52
2	100	139.94
3	200	143.68
4	300	145.71
5	400	143.45
6	500	143.24
7	600	140.54
8	700	141.76
9	800	137.15
10	900	139.34
11	1000	136.24
12	1100	144.95
13	1200	163.09
14	1300	150.18
15	1400	158.54
16	1500	150.92
17	1600	151.85
18	1700	142.51
19	1800	137.29
20	1900	138.01
21	2000	143.04
22	2100	140.18
23	2200	136.91
24	2300	135.83
25	2400	141.14
26	2500	141.24
27	2600	137.19
28	2700	135.52
29	2800	137.70
30	2900	135.47
31	3000	134.75
32	3100	136.63
33	3200	142.21
34	3300	141.76
35	3400	137.40
36	3500	136.04
37	3600	143.28
38	3700	137.84
39	3800	136.62
40	3900	140.70
41	4000	139.87
42	4100	147.84
43	4200	142.91
44	4300	150.99
45	4400	149.42
46	4500	141.06
47	4600	137.01
48	4700	136.22
49	4800	137.93
50	4900	147.39

Download This Route's Data

This route's measurement round is published as open data (CC BY 4.0) in CSV, JSON, and YAML. See About This Measurement for citation guidance.

Download this dataset

Per-route ICMP ping series, released under CC BY 4.0. Uncompressed plain text — no decompression step needed.

CSV JSON YAML Full dataset

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 ( $n_g=1.4679$ )	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	1.66×

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 current measurement round (2026-08-09) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

Round Statistic	Value
Minimum RTT	134.52 ms
Average RTT	141.7 ms
Maximum RTT	163.09 ms
Standard deviation	6.02 ms
Stdev / average	4.2%

RTT trend

Estimated route stability across the selected time window.

Average: 141.6 ms
Minimum: 140.2 ms
Maximum: 142.8 ms
Average loss: 0.02%

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

Reverse direction

Marseille to Seattle latency and RTT — 141.2 ms

Fastest routes departing Seattle (SEA)

Seattle to Los Angeles latency and RTT — 26.8 ms
Seattle to New York latency and RTT — 58.7 ms
Seattle to Ashburn latency and RTT — 61.8 ms
Seattle to Miami latency and RTT — 81.8 ms
Seattle to Tokyo latency and RTT — 84.6 ms

Fastest routes arriving at Marseille (MRS)

Paris to Marseille latency and RTT — 8.9 ms
Frankfurt to Marseille latency and RTT — 16.5 ms
London to Marseille latency and RTT — 18.2 ms
Amsterdam to Marseille latency and RTT — 19.8 ms
Berlin to Marseille latency and RTT — 21.6 ms

Same corridor (North America → Europe)

New York to London latency and RTT — 64.3 ms
New York to Paris latency and RTT — 68.4 ms
New York to Amsterdam latency and RTT — 68.7 ms

About This Measurement

Published RTT reflects best-case backbone path behavior measured with ICMP echo probes between PoPs. End-user latency also depends on local access networks, congestion, routing policy, and traffic engineering. None of these values is an SLA.

The measurement round behind this page is published as open data under CC BY 4.0 in the Hats Network latency dataset. Per-pair files are available at /opendata/latency/latest/pairs/sea-mrs.pings.{csv,json,yaml}. When citing, include the route, the measurement round date, and the dataset version — for example: "Hats Network latency dataset, Seattle → Marseille round 2026-08-09, CC BY 4.0".

Data auto-generated on August 9, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Seattle to Marseille Latency, Ping & RTT | AS203314