ICMP RTT metrics from São Paulo, Brazil to London, UK: average, minimum, maximum, jitter, packet loss, and fiber efficiency for the transatlantic route.

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

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

During the 2026-08-15T04:03:13Z measurement round, the São Paulo-to-London ICMP path averaged 174.7 ms across 50 samples, with a minimum of 165.57 ms and a maximum of 206.06 ms. No packets were lost, and jitter came in at 7.19 ms.

The route’s 8.49 ms standard deviation is modest in absolute terms but works out to about 4.9% of the average. This path finished sixth in the 19-route outbound set, while the median variability across that set was 3.08%.

At 53.1% fiber efficiency, the route runs about 1.88 times the theoretical fiber floor of 92.76 ms for the 9,472.8 km geodesic distance. The combination of zero loss and contained jitter means the Fair latency tier reflects the long Atlantic separation more than erratic delivery.

Latency Summary

Metric	Value
RTT	174.7 ms
Jitter	7.19 ms
Packet Loss	0%
Standard Fiber Floor	92.76 ms
Fiber Efficiency	53.1%
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 2026-08-15T04:03:13Z · avg 174.7 ± 1.20 ms (SE)

Sample distribution: box = interquartile range (168.5–177.9 ms), median 171.4 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	190.43
2	100	174.37
3	200	169.74
4	300	165.98
5	400	170.47
6	500	178.53
7	600	174.80
8	700	178.01
9	800	169.92
10	900	168.00
11	1000	168.22
12	1100	186.15
13	1200	183.73
14	1300	171.83
15	1400	167.42
16	1500	176.21
17	1600	177.71
18	1700	168.51
19	1800	167.12
20	1900	169.66
21	2000	181.44
22	2100	192.58
23	2200	176.82
24	2300	176.02
25	2400	184.29
26	2500	173.76
27	2600	180.90
28	2700	170.73
29	2800	172.26
30	2900	170.25
31	3000	206.06
32	3100	187.23
33	3200	173.36
34	3300	168.47
35	3400	195.51
36	3500	178.74
37	3600	174.60
38	3700	170.25
39	3800	169.24
40	3900	166.94
41	4000	168.87
42	4100	167.86
43	4200	168.42
44	4300	170.74
45	4400	171.02
46	4500	166.14
47	4600	166.49
48	4700	175.22
49	4800	168.41
50	4900	165.57

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	1.88×

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	165.57 ms
Average RTT	174.7 ms
Maximum RTT	206.06 ms
Standard deviation	8.49 ms
Stdev / average	4.9%

RTT trend

Estimated route stability across the selected time window.

Average: 174.6 ms
Minimum: 173.0 ms
Maximum: 176.6 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 — 171.8 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 — 156 ms

Fastest routes arriving at London (LON)

Amsterdam to London latency and RTT — 5.1 ms
Paris to London latency and RTT — 7.1 ms
Frankfurt to London latency and RTT — 12.6 ms
Berlin to London latency and RTT — 15.9 ms
Marseille to London latency and RTT — 24.5 ms

Same corridor (South America → Europe)

São Paulo to Paris latency and RTT — 179.4 ms
São Paulo to Amsterdam latency and RTT — 181.3 ms
São Paulo to Marseille 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 2026-08-15T04:03:13Z, CC BY 4.0".

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

São Paulo, Brazil → London, UK RTT