ICMP RTT from São Paulo, Brazil to London, UK: 175.8 ms average, 0% packet loss, fair latency. Explore the measurement details.

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

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

In the 2026-08-16T04:07:28Z round, 50 ICMP echo requests from São Paulo to London recorded an average RTT of 175.8 ms, with a minimum of 170.28 ms and a maximum of 196 ms. Packet loss was 0%, jitter was 3.82 ms, and the standard deviation was 5.34 ms.

The measured average sits 1.9 times above the 92.76 ms fiber floor for the 9,472.8 km great-circle distance, putting the route at 52.8% fiber efficiency and in the “Fair” latency tier. Geographic distance alone cannot explain the delay; the inflation over the fiber floor shows how much of the ideal path remains unrealized.

This route ranks 6th among the 19 outbound São Paulo routes in the round, while the median variability for those 19 paths is 3.28% of average RTT. At about 3.0% of its average, the route’s own standard deviation is slightly below that median, making London a steadier-than-typical transatlantic destination from São Paulo.

Latency Summary

Metric	Value
RTT	175.8 ms
Jitter	3.82 ms
Packet Loss	0%
Standard Fiber Floor	92.76 ms
Fiber Efficiency	52.8%
Latency Tier	Fair
Source Region	South America
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: GRU → LON

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 175.8 ± 0.76 ms (SE)

Sample distribution: box = interquartile range (172.3–177.0 ms), median 173.6 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	178.50
2	100	173.02
3	200	187.64
4	300	192.92
5	400	180.26
6	500	182.36
7	600	176.46
8	700	176.78
9	800	173.30
10	900	171.82
11	1000	174.85
12	1100	173.02
13	1200	173.07
14	1300	173.50
15	1400	171.38
16	1500	180.24
17	1600	176.82
18	1700	176.21
19	1800	196.00
20	1900	182.41
21	2000	176.43
22	2100	177.03
23	2200	172.67
24	2300	173.83
25	2400	172.98
26	2500	171.30
27	2600	176.70
28	2700	172.27
29	2800	174.02
30	2900	172.60
31	3000	183.55
32	3100	178.00
33	3200	179.72
34	3300	177.86
35	3400	173.25
36	3500	171.15
37	3600	171.85
38	3700	176.94
39	3800	172.35
40	3900	171.92
41	4000	170.91
42	4100	176.41
43	4200	173.71
44	4300	171.92
45	4400	172.87
46	4500	171.65
47	4600	171.56
48	4700	172.63
49	4800	171.08
50	4900	170.28

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 São Paulo (-23.54750, -46.63611) and London (51.50853, -0.12574). 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	1.9×

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	170.28 ms
Average RTT	175.8 ms
Maximum RTT	196 ms
Standard deviation	5.34 ms
Stdev / average	3.0%

RTT trend

Estimated route stability across the selected time window.

Average: 175.8 ms
Minimum: 174.2 ms
Maximum: 177.2 ms
Average loss: 0.01%

Route Context

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

Reverse direction

London to São Paulo latency and RTT — 170.7 ms

Fastest routes departing São Paulo (GRU)

São Paulo to Miami latency and RTT — 74 ms
São Paulo to New York latency and RTT — 122 ms
São Paulo to Ashburn latency and RTT — 128 ms
São Paulo to Los Angeles latency and RTT — 130.8 ms
São Paulo to Seattle latency and RTT — 155.9 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
Marseille to London latency and RTT — 18.9 ms

Same corridor (South America → Europe)

São Paulo to Amsterdam latency and RTT — 180 ms
São Paulo to Paris latency and RTT — 180.2 ms
São Paulo to Frankfurt latency and RTT — 186.2 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/gru-lon.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, São Paulo → 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.

São Paulo, Brazil → London, UK RTT