Explore São Paulo, Brazil to Ashburn, USA ICMP RTT, jitter, packet loss and fiber latency limits on the AS203314 network.

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

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

São Paulo to Ashburn averaged 128 ms across 50 replies. The observed range was 121.55 to 142 ms; these figures describe one probe round, not a long-term service target.

This is number 3 of 19 outgoing routes by average RTT. That ranking compares different destinations and is not adjusted for distance.

Latency Summary

Metric	Value
RTT	128 ms
Jitter	4.04 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

50 ICMP echo probes were recorded in this round. Individual replies and their distribution are shown below.

Ping series: GRU → IAD

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 128.0 ± 0.67 ms (SE)

Sample distribution: box = interquartile range (124.6–130.1 ms), median 127.0 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	121.55
2	100	142.00
3	200	139.94
4	300	141.61
5	400	128.37
6	500	124.18
7	600	123.22
8	700	122.07
9	800	122.82
10	900	122.59
11	1000	131.88
12	1100	127.95
13	1200	127.50
14	1300	131.26
15	1400	132.25
16	1500	129.84
17	1600	126.40
18	1700	129.38
19	1800	124.02
20	1900	123.04
21	2000	129.15
22	2100	127.43
23	2200	130.17
24	2300	129.87
25	2400	124.56
26	2500	123.68
27	2600	130.53
28	2700	126.70
29	2800	131.31
30	2900	125.67
31	3000	132.53
32	3100	125.24
33	3200	125.20
34	3300	122.35
35	3400	127.32
36	3500	125.02
37	3600	137.11
38	3700	128.29
39	3800	128.46
40	3900	129.33
41	4000	125.25
42	4100	124.31
43	4200	124.28
44	4300	125.86
45	4400	132.71
46	4500	125.69
47	4600	126.18
48	4700	132.61
49	4800	126.76
50	4900	124.56

Download This Route's Data

Download the probe round as CSV, JSON or YAML under CC BY 4.0. Citation details include the route and round timestamp.

CSV JSON YAML Full dataset

Theoretical Fiber Latency

The propagation model uses public city-centre coordinates from GeoNames: São Paulo (-23.54750, -46.63611) and Ashburn (39.04372, -77.48749). These are not facility coordinates or a surveyed cable path.

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×

The span count assumes 80 km optical spans. Attenuation is a power-loss term, not a propagation delay. See the model assumptions and equations.

Stability & Trend

Statistics from the same 50 replies. They describe this probe round, not continuous historical monitoring.

Round Statistic	Value
Minimum RTT	121.55 ms
Average RTT	128 ms
Maximum RTT	142 ms
Standard deviation	4.73 ms
Stdev / average	3.7%

Estimated RTT trend

Modeled comparison, not historical probe measurements.

Average: 128.0 ms
Minimum: 126.8 ms
Maximum: 129.0 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: 101.4 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: 155.9 ms
São Paulo to London latency and RTT: 175.8 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: 60.4 ms
Seattle to Ashburn latency and RTT: 61.5 ms
London to Ashburn latency and RTT: 71 ms

About This Measurement

These ICMP measurements cover the two backbone endpoints. Access networks, routing policy and load can change an end user's result. A probe round is not an SLA.

The underlying replies are available 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}. Cite the route, round timestamp and dataset version. Example: "Hats Network latency dataset, São Paulo → Ashburn round 2026-08-16T04:07:28Z, CC BY 4.0".

Round published August 16, 2026. See the full interactive latency matrix or browse more city-pair routes.

São Paulo, Brazil → Ashburn, USA RTT