London, UK to São Paulo, Brazil ICMP RTT measurement results: 50 samples, 171.8 ms average, 0% loss, and moderate jitter on a South Atlantic route.

🇬🇧 London, UK (LON) → 🇧🇷 São Paulo, Brazil (GRU)

Measurement round: 2026-08-15T04:03:13Z.

Round 2026-08-15T04:03:13Z recorded an average London-to-São Paulo ICMP round-trip time of 171.8 ms, with a minimum of 165.53 ms and a maximum of 187.69 ms. All 50 probes were returned, yielding 0% packet loss, while jitter was 4.69 ms and standard deviation was 5.45 ms.

Against the 19 London-origin routes in the same round, this path ranks 14th by outbound latency. Its variability of about 3.2% of the average sits close to the network median of roughly 3.08%, meaning the route's steadiness is near typical for this group.

The geodesic distance of 9,472.8 km places the vacuum floor at 63.2 ms and the fiber floor at 92.76 ms. The measured average is 1.85 times the fiber floor (54.0% fiber efficiency), so there is considerable propagation headroom; the zero loss and moderate jitter nonetheless show a route that is stable under this sample.

Latency Summary

Metric	Value
RTT	171.8 ms
Jitter	4.69 ms
Packet Loss	0%
Standard Fiber Floor	92.76 ms
Fiber Efficiency	54%
Latency Tier	Fair
Source Region	Europe
Destination Region	South America

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 → GRU

50 ICMP echo samples at 100 ms intervals · round 2026-08-15T04:03:13Z · avg 171.8 ± 0.77 ms (SE)

Sample distribution: box = interquartile range (168.1–173.8 ms), median 169.8 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 (92.8 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	168.21
2	100	167.80
3	200	187.69
4	300	176.27
5	400	183.14
6	500	171.33
7	600	167.26
8	700	167.45
9	800	172.07
10	900	177.39
11	1000	174.78
12	1100	169.78
13	1200	167.87
14	1300	169.81
15	1400	184.97
16	1500	174.65
17	1600	169.82
18	1700	169.07
19	1800	168.45
20	1900	167.98
21	2000	172.49
22	2100	169.84
23	2200	167.75
24	2300	168.04
25	2400	186.68
26	2500	176.73
27	2600	176.01
28	2700	172.42
29	2800	168.23
30	2900	168.68
31	3000	166.15
32	3100	165.53
33	3200	171.09
34	3300	186.02
35	3400	173.62
36	3500	170.42
37	3600	167.29
38	3700	170.70
39	3800	173.80
40	3900	169.34
41	4000	167.39
42	4100	168.76
43	4200	174.34
44	4300	170.56
45	4400	168.86
46	4500	170.40
47	4600	169.06
48	4700	169.77
49	4800	167.66
50	4900	166.58

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 São Paulo (-23.54750, -46.63611). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	9,472.8 km
Vacuum RTT floor	63.2 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	92.76 ms
Low-latency fiber material floor	92.39 ms
Engineering floor (5% path allowance)	97.42 ms
Research 1.33× mapped-fiber reference	123.38 ms
Estimated unamplified path loss	1989.3 dB
Transparent optical spans / inline amplifiers	125 / 124
Published RTT inflation over fiber floor	1.85×

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 (2026-08-15T04:03:13Z) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

Round Statistic	Value
Minimum RTT	165.53 ms
Average RTT	171.8 ms
Maximum RTT	187.69 ms
Standard deviation	5.45 ms
Stdev / average	3.2%

RTT trend

Estimated route stability across the selected time window.

Average: 171.7 ms
Minimum: 170.5 ms
Maximum: 173.0 ms
Average loss: 0.01%

Route Context

Departure PoP: London (LON)
Destination PoP: São Paulo (GRU)
Region overview: Europe → South America
Corridor overview: Europe to South America
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

São Paulo to London latency and RTT — 174.7 ms

Fastest routes departing London (LON)

London to Amsterdam latency and RTT — 5.1 ms
London to Paris latency and RTT — 7.1 ms
London to Frankfurt latency and RTT — 12.3 ms
London to Berlin latency and RTT — 16.2 ms
London to Marseille latency and RTT — 24.9 ms

Fastest routes arriving at São Paulo (GRU)

Ashburn to São Paulo latency and RTT — 102.6 ms
New York to São Paulo latency and RTT — 108.3 ms
Miami to São Paulo latency and RTT — 129.9 ms
Los Angeles to São Paulo latency and RTT — 131.1 ms
Seattle to São Paulo latency and RTT — 155.1 ms

Same corridor (Europe → South America)

Amsterdam to São Paulo latency and RTT — 176.5 ms
Paris to São Paulo latency and RTT — 176.9 ms
Frankfurt to São Paulo latency and RTT — 181.9 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/lon-gru.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, London → São Paulo round 2026-08-15T04:03:13Z, CC BY 4.0".

Data auto-generated on August 15, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

London, UK → São Paulo, Brazil RTT