London to Ashburn ping and RTT: 70.6 ms, 2.02 ms jitter, 58.1 ms fiber floor, and 82.3% efficiency across AS203314. Updated 2026-08-09.

🇬🇧 This page compares the published ping and round-trip time (RTT) from London (LON) to 🇺🇸 Ashburn (IAD) with vacuum and optical-fiber physical limits.

As of August 9, 2026, the London → Ashburn route on Hats Network averages 70.6 ms RTT across a 50-sample daily ICMP echo measurement round (source: RETN), 1.22× the theoretical fiber-floor limit of 58.1 ms.

Among the 19 measured routes departing London, this route ranks 8th fastest by average RTT.

With a stdev-to-average ratio of 3.4%, this route sits close to the network-wide stability median of 3.4%. Across the round, per-probe RTT ranged from 68 ms to 78.37 ms with a standard deviation of 2.37 ms.

Latency Summary

Metric	Value
RTT	70.6 ms
Jitter	2.02 ms
Packet Loss	0%
Standard Fiber Floor	58.1 ms
Fiber Efficiency	82.3%
Latency Tier	Excellent
Source Region	Europe
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: LON → IAD

50 ICMP echo samples at 100 ms intervals · round 2026-08-09 · avg 70.6 ± 0.34 ms (SE)

Sample distribution: box = interquartile range (68.8–71.4 ms), median 70.1 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 (58.1 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	68.25
2	100	74.46
3	200	71.52
4	300	72.45
5	400	69.90
6	500	74.46
7	600	70.82
8	700	68.73
9	800	69.95
10	900	69.16
11	1000	72.59
12	1100	73.84
13	1200	70.13
14	1300	68.94
15	1400	68.17
16	1500	70.71
17	1600	68.83
18	1700	70.25
19	1800	68.53
20	1900	68.00
21	2000	68.22
22	2100	70.08
23	2200	68.64
24	2300	68.69
25	2400	68.09
26	2500	68.83
27	2600	68.70
28	2700	71.07
29	2800	73.63
30	2900	70.10
31	3000	74.94
32	3100	71.45
33	3200	78.37
34	3300	74.37
35	3400	70.63
36	3500	70.66
37	3600	69.59
38	3700	68.55
39	3800	69.74
40	3900	69.41
41	4000	70.17
42	4100	70.08
43	4200	71.27
44	4300	68.89
45	4400	68.16
46	4500	68.39
47	4600	69.27
48	4700	72.09
49	4800	71.35
50	4900	76.88

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 London (51.50853, -0.12574) and Ashburn (39.04372, -77.48749). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	5,932.8 km
Vacuum RTT floor	39.58 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	58.1 ms
Low-latency fiber material floor	57.87 ms
Engineering floor (5% path allowance)	61.01 ms
Research 1.33× mapped-fiber reference	77.27 ms
Estimated unamplified path loss	1245.9 dB
Transparent optical spans / inline amplifiers	78 / 77
Published RTT inflation over fiber floor	1.22×

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 (2026-08-09) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

Round Statistic	Value
Minimum RTT	68 ms
Average RTT	70.6 ms
Maximum RTT	78.37 ms
Standard deviation	2.37 ms
Stdev / average	3.4%

RTT trend

Estimated route stability across the selected time window.

Average: 70.6 ms
Minimum: 70.0 ms
Maximum: 71.1 ms
Average loss: 0.02%

Route Context

Departure PoP: London (LON)
Destination PoP: Ashburn (IAD)
Region overview: Europe → North America
Corridor overview: Europe to North America
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Ashburn to London latency and RTT — 70.3 ms

Fastest routes departing London (LON)

London to Amsterdam latency and RTT — 5.1 ms
London to Paris latency and RTT — 6.4 ms
London to Frankfurt latency and RTT — 12.8 ms
London to Berlin latency and RTT — 16.5 ms
London to Marseille latency and RTT — 18.2 ms

Fastest routes arriving at Ashburn (IAD)

New York to Ashburn latency and RTT — 6.1 ms
Miami to Ashburn latency and RTT — 27 ms
Los Angeles to Ashburn latency and RTT — 59.2 ms
Seattle to Ashburn latency and RTT — 61.8 ms
Amsterdam to Ashburn latency and RTT — 75.6 ms

Same corridor (Europe → North America)

London to New York latency and RTT — 64 ms
Amsterdam to New York latency and RTT — 69.3 ms
Paris to New York latency and RTT — 69.3 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/lon-iad.pings.{csv,json,yaml}. When citing, include the route, the measurement round date, and the dataset version — for example: "Hats Network latency dataset, London → Ashburn round 2026-08-09, CC BY 4.0".

Data auto-generated on August 9, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

London to Ashburn Latency, Ping & RTT | AS203314