ICMP RTT from Marseille, France, to London, UK: 50-sample latency, packet loss, jitter, and route efficiency for the Marseille-London path.

🇫🇷 Marseille, France (MRS) → 🇬🇧 London, UK (LON)

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

For round 2026-08-16T04:07:28Z, the Marseille-to-London ICMP echo run averaged 18.9 ms over 50 probes, with a minimum of 18.41 ms and a maximum of 20.09 ms. No packets were lost, and the 0.42 ms standard deviation with 0.34 ms jitter points to very steady delivery.

Within the 19 outbound routes measured from Marseille, this pair ranks third by average latency. The median variability-to-average ratio across that route set is 3.28%, and this route's own ratio is below that level, so the low average is accompanied by equally consistent sample-to-sample behavior.

London is the western anchor of the Northwest European corridor, while Marseille is a Mediterranean cable landing hub, making this a useful westbound corridor for traffic coming ashore in southern France. The measured average is 1.93 times the theoretical fiber-floor latency, corresponding to a fiber-efficiency value of 51.9%. As an ICMP round-trip reading, it describes the network path's delay profile rather than end-user application quality.

Latency Summary

Metric	Value
RTT	18.9 ms
Jitter	0.34 ms
Packet Loss	0%
Standard Fiber Floor	9.82 ms
Fiber Efficiency	51.9%
Latency Tier	Ultra-Low
Source Region	Europe
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: MRS → LON

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 18.9 ± 0.06 ms (SE)

Sample distribution: box = interquartile range (18.6–19.0 ms), median 18.8 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 (9.8 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	18.41
2	100	19.44
3	200	20.09
4	300	19.29
5	400	18.81
6	500	19.18
7	600	19.01
8	700	18.67
9	800	18.89
10	900	18.56
11	1000	18.64
12	1100	18.75
13	1200	19.05
14	1300	18.68
15	1400	18.77
16	1500	18.53
17	1600	19.27
18	1700	18.83
19	1800	18.84
20	1900	18.90
21	2000	18.70
22	2100	19.92
23	2200	19.98
24	2300	18.97
25	2400	18.97
26	2500	18.79
27	2600	18.56
28	2700	18.43
29	2800	18.67
30	2900	19.56
31	3000	18.81
32	3100	18.73
33	3200	18.55
34	3300	18.63
35	3400	18.72
36	3500	18.61
37	3600	18.49
38	3700	18.58
39	3800	18.60
40	3900	18.60
41	4000	18.45
42	4100	19.01
43	4200	18.69
44	4300	18.70
45	4400	20.05
46	4500	19.17
47	4600	19.36
48	4700	18.87
49	4800	18.58
50	4900	18.64

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 Marseille (43.29695, 5.38107) and London (51.50853, -0.12574). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	1,002.4 km
Vacuum RTT floor	6.69 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	9.82 ms
Low-latency fiber material floor	9.78 ms
Engineering floor (5% path allowance)	10.31 ms
Research 1.33× mapped-fiber reference	13.06 ms
Estimated unamplified path loss	210.5 dB
Transparent optical spans / inline amplifiers	14 / 13
Published RTT inflation over fiber floor	1.93×

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 (2026-08-16T04:07:28Z) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

Round Statistic	Value
Minimum RTT	18.41 ms
Average RTT	18.9 ms
Maximum RTT	20.09 ms
Standard deviation	0.42 ms
Stdev / average	2.2%

RTT trend

Estimated route stability across the selected time window.

Average: 18.9 ms
Minimum: 18.7 ms
Maximum: 19.1 ms
Average loss: 0.02%

Route Context

Departure PoP: Marseille (MRS)
Destination PoP: London (LON)
Region overview: Europe → Europe
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

London to Marseille latency and RTT — 17.9 ms

Fastest routes departing Marseille (MRS)

Marseille to Paris latency and RTT — 8.9 ms
Marseille to Frankfurt latency and RTT — 16 ms
Marseille to Amsterdam latency and RTT — 20.3 ms
Marseille to Berlin latency and RTT — 20.6 ms
Marseille to Moscow latency and RTT — 49.6 ms

Fastest routes arriving at London (LON)

Amsterdam to London latency and RTT — 5.2 ms
Paris to London latency and RTT — 6.4 ms
Frankfurt to London latency and RTT — 12.9 ms
Berlin to London latency and RTT — 15.2 ms
Moscow to London latency and RTT — 42.4 ms

Same corridor (Europe → Europe)

London to Amsterdam latency and RTT — 5.2 ms
Amsterdam to Frankfurt latency and RTT — 5.9 ms
Frankfurt to Amsterdam latency and RTT — 5.9 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/mrs-lon.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Marseille → London round 2026-08-16T04:07:28Z, CC BY 4.0".

Data auto-generated on August 16, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Marseille, France → London, UK RTT