ICMP RTT measurement from Seattle, USA to Ashburn, USA: 61.5 ms average latency, 2.57 ms jitter, and zero packet loss across 50 echo samples.

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

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

For round 2026-08-16T04:07:28Z, the ICMP echo path from Seattle, USA to Ashburn, USA returned a 61.5 ms average round-trip time, with all 50 samples landing between 57.92 ms and 70.85 ms and no packet loss.

The measured average is 1.7 times the theoretical fiber floor for the 3,704 km span, which is consistent with an Excellent latency tier. Jitter of 2.57 ms and a standard deviation of 2.96 ms indicate a steady result, though not an ultra-tight one.

This route ranks third among the 19 outbound routes in its measurement set. Its standard-deviation-to-average ratio of about 4.8 percent sits above the set-wide median of 3.28 percent, so while zero loss and a 61.5 ms average make the result useful for baseline planning, the observed spread should be expected in that estimate.

Latency Summary

Metric	Value
RTT	61.5 ms
Jitter	2.57 ms
Packet Loss	0%
Standard Fiber Floor	36.27 ms
Fiber Efficiency	59%
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 2026-08-16T04:07:28Z · avg 61.5 ± 0.42 ms (SE)

Sample distribution: box = interquartile range (59.3–62.6 ms), median 60.8 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	63.16
2	100	59.86
3	200	58.23
4	300	58.41
5	400	64.88
6	500	62.75
7	600	61.37
8	700	62.24
9	800	58.99
10	900	61.82
11	1000	61.50
12	1100	59.25
13	1200	70.85
14	1300	65.51
15	1400	65.69
16	1500	61.30
17	1600	70.05
18	1700	66.02
19	1800	60.96
20	1900	59.33
21	2000	67.70
22	2100	61.70
23	2200	60.42
24	2300	61.45
25	2400	60.15
26	2500	59.26
27	2600	59.01
28	2700	59.78
29	2800	61.29
30	2900	64.30
31	3000	64.06
32	3100	60.32
33	3200	59.00
34	3300	58.10
35	3400	60.27
36	3500	59.78
37	3600	59.48
38	3700	66.26
39	3800	60.66
40	3900	58.92
41	4000	58.58
42	4100	59.02
43	4200	59.73
44	4300	58.97
45	4400	57.92
46	4500	61.28
47	4600	60.25
48	4700	62.76
49	4800	60.90
50	4900	61.51

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	1.7×

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	57.92 ms
Average RTT	61.5 ms
Maximum RTT	70.85 ms
Standard deviation	2.96 ms
Stdev / average	4.8%

RTT trend

Estimated route stability across the selected time window.

Average: 61.6 ms
Minimum: 60.9 ms
Maximum: 62.1 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 — 62.3 ms

Fastest routes departing Seattle (SEA)

Seattle to Los Angeles latency and RTT — 25.9 ms
Seattle to New York latency and RTT — 59.5 ms
Seattle to Miami latency and RTT — 81.7 ms
Seattle to Tokyo latency and RTT — 85 ms
Seattle to Taipei latency and RTT — 114.7 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 — 60.4 ms
London to Ashburn latency and RTT — 71 ms
Paris to Ashburn latency and RTT — 75.5 ms

Same corridor (North America → North America)

Ashburn to New York latency and RTT — 6 ms
Los Angeles to Seattle latency and RTT — 26.9 ms
Ashburn to Miami latency and RTT — 27.4 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 2026-08-16T04:07:28Z, CC BY 4.0".

Data auto-generated on August 16, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Seattle, USA → Ashburn, USA RTT