Explore Seattle, USA to Marseille, France ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.

🇺🇸 Seattle, USA (SEA) → 🇫🇷 Marseille, France (MRS)

Measurement round: 2026-08-16T04:07:28Z.

Seattle to Marseille averaged 141.2 ms across 50 replies. The observed range was 134.28 to 166.5 ms; these figures describe one probe round, not a long-term service target.

Standard deviation was 6.79 ms, or 4.8% of the average. This describes variation within the sample without identifying its cause.

Latency Summary

Metric	Value
RTT	141.2 ms
Jitter	5.32 ms
Packet Loss	0%
Standard Fiber Floor	85.27 ms
Fiber Efficiency	60.4%
Latency Tier	Good
Source Region	North America
Destination Region	Europe

Ping Measurement Series

50 ICMP echo probes were recorded in this round. Individual replies and their distribution are shown below.

Ping series: SEA → MRS

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 141.2 ± 0.96 ms (SE)

Sample distribution: box = interquartile range (136.5–144.6 ms), median 138.8 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	136.59
2	100	134.96
3	200	147.62
4	300	148.46
5	400	145.33
6	500	138.53
7	600	139.75
8	700	146.26
9	800	141.53
10	900	137.25
11	1000	141.56
12	1100	138.55
13	1200	138.26
14	1300	135.45
15	1400	138.81
16	1500	137.01
17	1600	141.12
18	1700	137.37
19	1800	136.25
20	1900	135.07
21	2000	135.41
22	2100	138.76
23	2200	136.27
24	2300	134.84
25	2400	134.28
26	2500	147.56
27	2600	139.56
28	2700	136.60
29	2800	136.08
30	2900	135.90
31	3000	137.75
32	3100	140.64
33	3200	136.45
34	3300	135.11
35	3400	135.61
36	3500	155.58
37	3600	145.71
38	3700	140.29
39	3800	137.12
40	3900	156.28
41	4000	166.50
42	4100	149.20
43	4200	139.36
44	4300	155.07
45	4400	142.24
46	4500	152.21
47	4600	147.50
48	4700	139.87
49	4800	139.99
50	4900	136.53

Download This Route's Data

Download the probe round as CSV, JSON or YAML under CC BY 4.0. Citation details include the route and round timestamp.

CSV JSON YAML Full dataset

Theoretical Fiber Latency

The propagation model uses public city-centre coordinates from GeoNames: Seattle (47.60621, -122.33207) and Marseille (43.29695, 5.38107). These are not facility coordinates or a surveyed cable path.

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×

The span count assumes 80 km optical spans. Attenuation is a power-loss term, not a propagation delay. See the model assumptions and equations.

Stability & Trend

Statistics from the same 50 replies. They describe this probe round, not continuous historical monitoring.

Round Statistic	Value
Minimum RTT	134.28 ms
Average RTT	141.2 ms
Maximum RTT	166.5 ms
Standard deviation	6.79 ms
Stdev / average	4.8%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 141.1 ms
Minimum: 139.7 ms
Maximum: 142.5 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

Reverse direction

Marseille to Seattle latency and RTT: 141.7 ms

Fastest routes departing Seattle (SEA)

Seattle to Los Angeles latency and RTT: 25.9 ms
Seattle to New York latency and RTT: 59.5 ms
Seattle to Ashburn latency and RTT: 61.5 ms
Seattle to Miami latency and RTT: 81.7 ms
Seattle to Tokyo latency and RTT: 85 ms

Fastest routes arriving at Marseille (MRS)

Paris to Marseille latency and RTT: 8.9 ms
Frankfurt to Marseille latency and RTT: 16.4 ms
London to Marseille latency and RTT: 17.9 ms
Amsterdam to Marseille latency and RTT: 19.6 ms
Berlin to Marseille latency and RTT: 20.2 ms

Same corridor (North America → Europe)

New York to London latency and RTT: 63.5 ms
New York to Amsterdam latency and RTT: 68.7 ms
New York to Paris latency and RTT: 68.9 ms

About This Measurement

These ICMP measurements cover the two backbone endpoints. Access networks, routing policy and load can change an end user's result. A probe round is not an SLA.

The underlying replies are available 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}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, Seattle → Marseille round 2026-08-16T04:07:28Z, CC BY 4.0".

Round published August 16, 2026. See the full interactive latency matrix or browse more city-pair routes.

Seattle, USA → Marseille, France RTT