Seattle, USA to Ashburn, USA ICMP round-trip time measurement: 62 ms average, 0% loss, 50 samples, round 2026-08-15T04:03:13Z.

🇺🇸 Seattle, USA (SEA) → 🇺🇸 Ashburn, USA (IAD)

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

For round 2026-08-15T04:03:13Z, the Seattle-to-Ashburn ICMP echo path averaged 62 ms over 50 samples, with a minimum of 59.71 ms and a maximum of 66.98 ms. Zero packets were lost, and the 1.84 ms standard deviation kept the round-trip times tightly grouped.

This is 1.71 times the theoretical fiber floor for the 3,704 km great-circle distance, which translates to a fiber efficiency of 58.5 percent. The route ranked third among the 19 outbound paths measured in this round, and its variability sits below the group's median 3.08 percent dispersion, so the consistency is not simply a byproduct of a low average.

The sub-2 ms jitter and zero loss indicate a stable route under the conditions sampled. For a coast-to-coast crossing, the 62 ms average is a useful network-level benchmark, though it should not be read as a prediction of application performance.

Latency Summary

Metric	Value
RTT	62 ms
Jitter	1.52 ms
Packet Loss	0%
Standard Fiber Floor	36.27 ms
Fiber Efficiency	58.5%
Latency Tier	Excellent
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 → IAD

50 ICMP echo samples at 100 ms intervals · round 2026-08-15T04:03:13Z · avg 62.0 ± 0.26 ms (SE)

Sample distribution: box = interquartile range (60.7–63.1 ms), median 61.5 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 (36.3 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	60.02
2	100	59.71
3	200	65.43
4	300	61.60
5	400	61.42
6	500	62.44
7	600	61.32
8	700	59.91
9	800	59.76
10	900	63.91
11	1000	63.75
12	1100	65.55
13	1200	65.71
14	1300	66.98
15	1400	62.78
16	1500	62.26
17	1600	61.64
18	1700	60.88
19	1800	64.32
20	1900	61.56
21	2000	60.00
22	2100	64.30
23	2200	61.13
24	2300	60.10
25	2400	61.63
26	2500	60.23
27	2600	59.71
28	2700	62.58
29	2800	62.60
30	2900	61.01
31	3000	59.93
32	3100	64.69
33	3200	65.14
34	3300	64.59
35	3400	63.38
36	3500	61.55
37	3600	60.72
38	3700	63.15
39	3800	61.37
40	3900	61.70
41	4000	60.16
42	4100	61.15
43	4200	61.34
44	4300	60.97
45	4400	62.27
46	4500	61.09
47	4600	61.52
48	4700	60.74
49	4800	60.05
50	4900	60.25

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 Ashburn (39.04372, -77.48749). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	3,704 km
Vacuum RTT floor	24.71 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	36.27 ms
Low-latency fiber material floor	36.13 ms
Engineering floor (5% path allowance)	38.09 ms
Research 1.33× mapped-fiber reference	48.24 ms
Estimated unamplified path loss	777.8 dB
Transparent optical spans / inline amplifiers	49 / 48
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	59.71 ms
Average RTT	62 ms
Maximum RTT	66.98 ms
Standard deviation	1.84 ms
Stdev / average	3.0%

RTT trend

Estimated route stability across the selected time window.

Average: 62.1 ms
Minimum: 61.4 ms
Maximum: 62.6 ms
Average loss: 0.03%

Route Context

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

Reverse direction

Ashburn to Seattle latency and RTT — 61.3 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 Miami latency and RTT — 81.1 ms
Seattle to Tokyo latency and RTT — 84.8 ms
Seattle to Taipei latency and RTT — 115.1 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
London to Ashburn latency and RTT — 71.3 ms
Amsterdam to Ashburn latency and RTT — 75.7 ms

Same corridor (North America → North America)

Ashburn to New York latency and RTT — 6 ms
Los Angeles to Seattle latency and RTT — 27.5 ms
Ashburn to Miami latency and RTT — 28.6 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-iad.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Seattle → 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.

Seattle, USA → Ashburn, USA RTT