ICMP echo RTT from Ashburn, USA to São Paulo, Brazil: average 101.4 ms, jitter, packet loss and route efficiency for the IAD-GRU path.

🇺🇸 Ashburn, USA (IAD) → 🇧🇷 São Paulo, Brazil (GRU)

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

During the 2026-08-16T04:07:28Z measurement round, ICMP echo RTT from Ashburn to São Paulo averaged 101.4 ms across 50 samples, with a minimum of 98.16 ms and a maximum of 107.74 ms. Zero packet loss and 2.06 ms jitter made the window unusually stable.

The observed average is 1.36 times the theoretical fiber floor for the 7,637.7 km great-circle distance, translating to 73.8% fiber efficiency. The 2.31 ms standard deviation, or about 2.3% of the average, points to low sample-to-sample variation.

Ranked 11th among the 19 outbound paths sampled from this network, the route showed less variability than the network-wide median ratio of 3.28%. The tight 9.6 ms spread between minimum and maximum is a useful bound for short-term RTT variation on this corridor.

Latency Summary

Metric	Value
RTT	101.4 ms
Jitter	2.06 ms
Packet Loss	0%
Standard Fiber Floor	74.79 ms
Fiber Efficiency	73.8%
Latency Tier	Good
Source Region	North America
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: IAD → GRU

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 101.4 ± 0.33 ms (SE)

Sample distribution: box = interquartile range (99.8–102.3 ms), median 100.4 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 (74.8 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	98.16
2	100	99.09
3	200	99.08
4	300	101.26
5	400	99.51
6	500	99.52
7	600	99.21
8	700	99.82
9	800	102.69
10	900	100.15
11	1000	103.97
12	1100	100.32
13	1200	100.36
14	1300	100.03
15	1400	99.59
16	1500	98.91
17	1600	102.29
18	1700	100.09
19	1800	106.90
20	1900	102.19
21	2000	101.71
22	2100	99.76
23	2200	103.13
24	2300	99.95
25	2400	99.87
26	2500	99.35
27	2600	99.15
28	2700	102.31
29	2800	100.44
30	2900	100.99
31	3000	101.63
32	3100	100.37
33	3200	106.27
34	3300	103.71
35	3400	101.47
36	3500	100.85
37	3600	99.81
38	3700	100.19
39	3800	101.20
40	3900	105.16
41	4000	100.65
42	4100	100.08
43	4200	107.46
44	4300	103.74
45	4400	107.74
46	4500	104.05
47	4600	104.10
48	4700	101.98
49	4800	100.46
50	4900	99.28

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 Ashburn (39.04372, -77.48749) and São Paulo (-23.54750, -46.63611). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	7,637.7 km
Vacuum RTT floor	50.95 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	74.79 ms
Low-latency fiber material floor	74.49 ms
Engineering floor (5% path allowance)	78.54 ms
Research 1.33× mapped-fiber reference	99.48 ms
Estimated unamplified path loss	1603.9 dB
Transparent optical spans / inline amplifiers	101 / 100
Published RTT inflation over fiber floor	1.36×

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	98.16 ms
Average RTT	101.4 ms
Maximum RTT	107.74 ms
Standard deviation	2.31 ms
Stdev / average	2.3%

RTT trend

Estimated route stability across the selected time window.

Average: 101.5 ms
Minimum: 100.5 ms
Maximum: 102.4 ms
Average loss: 0.02%

Route Context

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

Reverse direction

São Paulo to Ashburn latency and RTT — 128 ms

Fastest routes departing Ashburn (IAD)

Ashburn to New York latency and RTT — 6 ms
Ashburn to Miami latency and RTT — 27.4 ms
Ashburn to Los Angeles latency and RTT — 60.7 ms
Ashburn to Seattle latency and RTT — 62.3 ms
Ashburn to London latency and RTT — 70.3 ms

Fastest routes arriving at São Paulo (GRU)

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
London to São Paulo latency and RTT — 170.7 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/iad-gru.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Ashburn → 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.

Ashburn, USA → São Paulo, Brazil RTT