ICMP RTT from São Paulo, Brazil (GRU) to Ashburn, USA (IAD): average latency, jitter, packet loss, and route efficiency from the 2026-08-15T04:03:13Z round.

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

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

The 2026-08-15T04:03:13Z ICMP echo round from São Paulo, Brazil to Ashburn, USA collected 50 samples at 100 ms intervals, returning an average RTT of 128 ms, a minimum of 123.13 ms, a maximum of 146.31 ms, and zero packet loss. The standard deviation of 4.81 ms and jitter of 3.64 ms show that most replies landed in a comparatively narrow band around the average.

Geographically, the 7,637.7 km separation between the two cities gives a theoretical vacuum round-trip floor of 50.95 ms and a straight-line fiber round-trip floor of 74.79 ms. The 128 ms average is 1.71 times that fiber floor, so the route's efficiency relative to the straight-line fiber round-trip floor is 58.4%, and the observed RTT sits about 53 ms above that lower bound.

Within the 2026-08-15T04:03:13Z round, the route ranks third among 19 outbound route measurements, and its standard-deviation-to-average ratio of roughly 3.8% is slightly higher than the 3.08% median across the round's routes. The practical takeaway is that Ashburn-bound ICMP from São Paulo currently shows reliable delivery (0% loss) and modest typical variation, although the 23.18 ms gap between the fastest and slowest replies means the range deserves attention even with a low jitter figure.

Latency Summary

Metric	Value
RTT	128 ms
Jitter	3.64 ms
Packet Loss	0%
Standard Fiber Floor	74.79 ms
Fiber Efficiency	58.4%
Latency Tier	Good
Source Region	South America
Destination Region	North 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: GRU → IAD

50 ICMP echo samples at 100 ms intervals · round 2026-08-15T04:03:13Z · avg 128.0 ± 0.68 ms (SE)

Sample distribution: box = interquartile range (124.7–129.5 ms), median 126.3 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	124.15
2	100	123.74
3	200	135.48
4	300	131.52
5	400	126.50
6	500	124.38
7	600	123.60
8	700	127.46
9	800	146.31
10	900	134.59
11	1000	127.67
12	1100	124.68
13	1200	125.60
14	1300	125.40
15	1400	125.38
16	1500	124.70
17	1600	123.53
18	1700	124.32
19	1800	124.34
20	1900	124.91
21	2000	123.62
22	2100	123.13
23	2200	127.57
24	2300	130.84
25	2400	127.79
26	2500	130.01
27	2600	128.25
28	2700	127.55
29	2800	125.43
30	2900	124.11
31	3000	128.55
32	3100	126.68
33	3200	138.30
34	3300	134.45
35	3400	129.73
36	3500	125.99
37	3600	125.52
38	3700	124.17
39	3800	127.07
40	3900	137.72
41	4000	133.16
42	4100	128.79
43	4200	126.01
44	4300	125.43
45	4400	138.31
46	4500	132.17
47	4600	126.75
48	4700	125.04
49	4800	125.20
50	4900	124.40

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 Ashburn (39.04372, -77.48749). 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	1.71×

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	123.13 ms
Average RTT	128 ms
Maximum RTT	146.31 ms
Standard deviation	4.81 ms
Stdev / average	3.8%

RTT trend

Estimated route stability across the selected time window.

Average: 128.0 ms
Minimum: 126.7 ms
Maximum: 129.2 ms
Average loss: 0.02%

Route Context

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

Reverse direction

Ashburn to São Paulo latency and RTT — 102.6 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 Los Angeles latency and RTT — 130.8 ms
São Paulo to Seattle latency and RTT — 156 ms
São Paulo to London latency and RTT — 174.7 ms

Fastest routes arriving at Ashburn (IAD)

New York to Ashburn latency and RTT — 6 ms
Miami to Ashburn latency and RTT — 27.3 ms
Los Angeles to Ashburn latency and RTT — 59.9 ms
Seattle to Ashburn latency and RTT — 62 ms
London to Ashburn latency and RTT — 71.3 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/gru-iad.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 → Ashburn 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 → Ashburn, USA RTT