ICMP RTT measurement from London, UK to Frankfurt, Germany: 50-sample round-trip latency, packet loss, jitter, and fiber-floor efficiency for this route.

🇬🇧 London, UK (LON) → 🇩🇪 Frankfurt, Germany (FRA)

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

In round 2026-08-16T04:07:28Z, ICMP echo round-trip time from London, UK to Frankfurt, Germany averaged 13.6 ms across 50 samples, with a minimum of 13.18 ms and a maximum of 15.43 ms. No packets were lost, and jitter was 0.29 ms.

The geodesic distance of 639.5 km yields a fiber-floor round-trip estimate of 6.26 ms. The observed 13.6 ms average is 2.17 times that floor, corresponding to 46.1% fiber efficiency; the 13.18 ms minimum remains 6.92 ms above the floor, so the route does not approach its physical limit in this round.

This route ranked third among the 19 routes measured from London in this round. Its standard deviation of 0.42 ms is about 3.1% of the mean, close to the 3.28% median spread across the set, and jitter stayed at 0.29 ms. Despite the modest fiber-efficiency figure, the route shows tight dispersion within the ultra-low latency tier.

Latency Summary

Metric	Value
RTT	13.6 ms
Jitter	0.29 ms
Packet Loss	0%
Standard Fiber Floor	6.26 ms
Fiber Efficiency	46.1%
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: LON → FRA

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 13.6 ± 0.06 ms (SE)

Sample distribution: box = interquartile range (13.3–13.7 ms), median 13.5 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 (6.3 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	15.43
2	100	14.04
3	200	13.50
4	300	13.36
5	400	13.33
6	500	13.25
7	600	13.22
8	700	13.39
9	800	13.31
10	900	13.26
11	1000	14.71
12	1100	13.85
13	1200	13.46
14	1300	13.68
15	1400	13.69
16	1500	13.86
17	1600	13.52
18	1700	13.79
19	1800	13.69
20	1900	13.33
21	2000	13.18
22	2100	13.29
23	2200	13.51
24	2300	14.25
25	2400	13.52
26	2500	13.42
27	2600	13.51
28	2700	13.63
29	2800	13.33
30	2900	13.63
31	3000	13.71
32	3100	13.88
33	3200	13.67
34	3300	13.40
35	3400	13.68
36	3500	13.47
37	3600	13.33
38	3700	13.38
39	3800	13.28
40	3900	13.71
41	4000	14.54
42	4100	14.14
43	4200	13.76
44	4300	13.38
45	4400	13.21
46	4500	13.34
47	4600	13.21
48	4700	13.28
49	4800	13.42
50	4900	13.27

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 London (51.50853, -0.12574) and Frankfurt am Main (50.11552, 8.68417). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	639.5 km
Vacuum RTT floor	4.27 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	6.26 ms
Low-latency fiber material floor	6.24 ms
Engineering floor (5% path allowance)	6.58 ms
Research 1.33× mapped-fiber reference	8.33 ms
Estimated unamplified path loss	134.3 dB
Transparent optical spans / inline amplifiers	9 / 8
Published RTT inflation over fiber floor	2.17×

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 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	13.18 ms
Average RTT	13.6 ms
Maximum RTT	15.43 ms
Standard deviation	0.42 ms
Stdev / average	3.1%

RTT trend

Estimated route stability across the selected time window.

Average: 13.6 ms
Minimum: 13.5 ms
Maximum: 13.8 ms
Average loss: 0.02%

Route Context

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

Reverse direction

Frankfurt to London latency and RTT — 12.9 ms

Fastest routes departing London (LON)

London to Amsterdam latency and RTT — 5.2 ms
London to Paris latency and RTT — 6.4 ms
London to Berlin latency and RTT — 16.2 ms
London to Marseille latency and RTT — 17.9 ms
London to Moscow latency and RTT — 43.5 ms

Fastest routes arriving at Frankfurt (FRA)

Amsterdam to Frankfurt latency and RTT — 5.9 ms
Berlin to Frankfurt latency and RTT — 6.1 ms
Paris to Frankfurt latency and RTT — 7.6 ms
Marseille to Frankfurt latency and RTT — 16 ms
Moscow to Frankfurt latency and RTT — 35.9 ms

Same corridor (Europe → Europe)

Amsterdam to London latency and RTT — 5.2 ms
Frankfurt to Amsterdam latency and RTT — 5.9 ms
Frankfurt to Berlin latency and RTT — 6.1 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/lon-fra.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, London → Frankfurt 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.

London, UK → Frankfurt, Germany RTT