London (UK) to São Paulo (Brazil) ICMP echo RTT: 170.7 ms average latency, 4.17 ms jitter, zero packet loss, and 54.3% fiber efficiency.

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

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

In the 2026-08-16T04:07:28Z round, London-to-São Paulo produced an average ICMP echo RTT of 170.7 ms from 50 samples, with a minimum of 165.28 ms and a maximum of 185.16 ms.

The 4.35 ms standard deviation and 4.17 ms jitter place the route in the fair latency tier, and no packet loss was observed. Across the 9,472.8 km great-circle distance, the fiber floor is 92.76 ms, so the average is 1.84 times that floor and fiber efficiency is 54.3%.

Ranked 14th among the 19 routes measured in this round, this route is one of the slower ones in the set. Its standard deviation is 2.55% of the average, below the median of 3.28% across the measured route set, so timing remains relatively consistent even at the higher latency level.

Latency Summary

Metric	Value
RTT	170.7 ms
Jitter	4.17 ms
Packet Loss	0%
Standard Fiber Floor	92.76 ms
Fiber Efficiency	54.3%
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 2026-08-16T04:07:28Z · avg 170.7 ± 0.62 ms (SE)

Sample distribution: box = interquartile range (167.3–173.2 ms), median 169.6 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 (92.8 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	170.94
2	100	173.65
3	200	170.60
4	300	173.22
5	400	167.75
6	500	166.33
7	600	175.10
8	700	170.25
9	800	175.59
10	900	170.35
11	1000	177.87
12	1100	169.84
13	1200	166.51
14	1300	168.72
15	1400	168.68
16	1500	168.09
17	1600	185.16
18	1700	173.04
19	1800	175.78
20	1900	168.64
21	2000	166.54
22	2100	169.54
23	2200	168.89
24	2300	166.97
25	2400	169.00
26	2500	166.41
27	2600	165.28
28	2700	167.31
29	2800	166.89
30	2900	181.18
31	3000	175.12
32	3100	169.62
33	3200	168.72
34	3300	167.57
35	3400	166.11
36	3500	178.14
37	3600	178.32
38	3700	176.82
39	3800	170.10
40	3900	167.25
41	4000	165.92
42	4100	172.25
43	4200	170.77
44	4300	167.05
45	4400	169.98
46	4500	166.50
47	4600	174.54
48	4700	169.54
49	4800	169.72
50	4900	166.84

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	1.84×

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	165.28 ms
Average RTT	170.7 ms
Maximum RTT	185.16 ms
Standard deviation	4.35 ms
Stdev / average	2.5%

RTT trend

Estimated route stability across the selected time window.

Average: 170.7 ms
Minimum: 169.5 ms
Maximum: 172.4 ms
Average loss: 0.02%

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 — 175.8 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 Frankfurt latency and RTT — 13.6 ms
London to Berlin latency and RTT — 16.2 ms
London to Marseille latency and RTT — 17.9 ms

Fastest routes arriving at São Paulo (GRU)

Ashburn to São Paulo latency and RTT — 101.4 ms
New York to São Paulo latency and RTT — 106.9 ms
Miami to São Paulo latency and RTT — 128.7 ms
Los Angeles to São Paulo latency and RTT — 131.3 ms
Seattle to São Paulo latency and RTT — 155.7 ms

Same corridor (Europe → South America)

Amsterdam to São Paulo latency and RTT — 175.5 ms
Paris to São Paulo latency and RTT — 175.8 ms
Frankfurt to São Paulo latency and RTT — 181.3 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 2026-08-16T04:07:28Z, 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 → São Paulo, Brazil RTT