Seattle, USA to Miami, USA ICMP round-trip time measurement: 81.1 ms average, 0% loss, 50 samples, round 2026-08-15T04:03:13Z.

🇺🇸 Seattle, USA (SEA) → 🇺🇸 Miami, USA (MIA)

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

In round 2026-08-15T04:03:13Z, Seattle-to-Miami ICMP echo RTT averaged 81.1 ms across 50 samples, with a minimum of 76.51 ms and a maximum of 94.5 ms. Zero packets were lost, but the 3.95 ms standard deviation and 2.79 ms jitter show the path is not perfectly uniform.

The route ranked fourth among the 19 outbound paths measured in this round, and its 4.9 percent relative dispersion sits above the group's median 3.08 percent. At 1.88 times the direct fiber floor for the 4,399.4 km great-circle distance, the path carries notable overhead, with fiber efficiency of 53.1 percent.

Despite the Good latency tier, the near-18 ms gap between minimum and maximum is the most useful signal: the path is consistently loss-free but occasionally adds delay at the tail. For a transcontinental route terminating in Miami's Latin American gateway, this round provides a realistic network-level RTT benchmark rather than an end-user performance promise.

Latency Summary

Metric	Value
RTT	81.1 ms
Jitter	2.79 ms
Packet Loss	0%
Standard Fiber Floor	43.08 ms
Fiber Efficiency	53.1%
Latency Tier	Good
Source Region	North 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: SEA → MIA

50 ICMP echo samples at 100 ms intervals · round 2026-08-15T04:03:13Z · avg 81.1 ± 0.56 ms (SE)

Sample distribution: box = interquartile range (78.4–81.7 ms), median 80.4 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 (43.1 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	86.84
2	100	80.11
3	200	81.21
4	300	77.85
5	400	80.87
6	500	80.28
7	600	80.72
8	700	85.02
9	800	80.41
10	900	79.42
11	1000	78.37
12	1100	78.04
13	1200	77.66
14	1300	80.43
15	1400	78.76
16	1500	77.08
17	1600	76.51
18	1700	77.74
19	1800	78.93
20	1900	81.44
21	2000	81.14
22	2100	81.23
23	2200	80.97
24	2300	78.44
25	2400	79.09
26	2500	77.57
27	2600	76.65
28	2700	76.54
29	2800	79.84
30	2900	78.06
31	3000	77.18
32	3100	86.97
33	3200	85.60
34	3300	94.50
35	3400	83.67
36	3500	94.21
37	3600	87.83
38	3700	81.23
39	3800	88.53
40	3900	81.84
41	4000	81.10
42	4100	79.74
43	4200	81.99
44	4300	82.25
45	4400	80.55
46	4500	82.76
47	4600	79.36
48	4700	79.91
49	4800	77.79
50	4900	80.77

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 Seattle (47.60621, -122.33207) and Miami (25.77427, -80.19366). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	4,399.4 km
Vacuum RTT floor	29.35 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	43.08 ms
Low-latency fiber material floor	42.91 ms
Engineering floor (5% path allowance)	45.24 ms
Research 1.33× mapped-fiber reference	57.3 ms
Estimated unamplified path loss	923.9 dB
Transparent optical spans / inline amplifiers	58 / 57
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	76.51 ms
Average RTT	81.1 ms
Maximum RTT	94.5 ms
Standard deviation	3.95 ms
Stdev / average	4.9%

RTT trend

Estimated route stability across the selected time window.

Average: 81.1 ms
Minimum: 80.2 ms
Maximum: 81.9 ms
Average loss: 0.02%

Route Context

Departure PoP: Seattle (SEA)
Destination PoP: Miami (MIA)
Region overview: North America → North America
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Miami to Seattle latency and RTT — 82 ms

Fastest routes departing Seattle (SEA)

Seattle to Los Angeles latency and RTT — 26.6 ms
Seattle to New York latency and RTT — 59 ms
Seattle to Ashburn latency and RTT — 62 ms
Seattle to Tokyo latency and RTT — 84.8 ms
Seattle to Taipei latency and RTT — 115.1 ms

Fastest routes arriving at Miami (MIA)

Ashburn to Miami latency and RTT — 28.6 ms
New York to Miami latency and RTT — 34.3 ms
Los Angeles to Miami latency and RTT — 57.1 ms
São Paulo to Miami latency and RTT — 74 ms
London to Miami latency and RTT — 100.9 ms

Same corridor (North America → North America)

Ashburn to New York latency and RTT — 6 ms
New York to Ashburn latency and RTT — 6 ms
Miami to Ashburn latency and RTT — 27.3 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/sea-mia.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Seattle → Miami 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.

Seattle, USA → Miami, USA RTT