London, UK to New York, USA ICMP RTT measurement results: 50 samples, 63.5 ms average, 0% loss, and low jitter on the transatlantic route.

🇬🇧 London, UK (LON) → 🇺🇸 New York, USA (NYC)

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

ICMP echo requests sent in round 2026-08-15T04:03:13Z between London and New York averaged 63.5 ms round-trip time, with a minimum of 62.2 ms and a maximum of 66.7 ms. All 50 samples were answered, so packet loss was 0%, and jitter remained low at 0.86 ms.

Compared with the 19 London-origin routes in the same round, this path ranks 7th by outbound latency. Its variability is about 1.6% of the average, clearly below the network median of roughly 3.08%, making this one of the steadier transatlantic routes.

The geodesic distance is 5,585.2 km, giving a vacuum light-time floor of 37.26 ms and a fiber floor of 54.69 ms. At 63.5 ms, the measured average is only 1.16 times the fiber floor, or 86.1% fiber efficiency, leaving little propagation headroom.

Latency Summary

Metric	Value
RTT	63.5 ms
Jitter	0.86 ms
Packet Loss	0%
Standard Fiber Floor	54.69 ms
Fiber Efficiency	86.1%
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 → NYC

50 ICMP echo samples at 100 ms intervals · round 2026-08-15T04:03:13Z · avg 63.5 ± 0.14 ms (SE)

Sample distribution: box = interquartile range (62.7–64.1 ms), median 63.3 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 (54.7 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	62.20
2	100	63.22
3	200	62.74
4	300	62.94
5	400	62.45
6	500	62.41
7	600	64.62
8	700	63.16
9	800	63.02
10	900	64.33
11	1000	63.17
12	1100	62.73
13	1200	63.55
14	1300	63.39
15	1400	62.62
16	1500	63.01
17	1600	63.04
18	1700	63.72
19	1800	63.54
20	1900	62.66
21	2000	62.63
22	2100	62.52
23	2200	62.37
24	2300	62.37
25	2400	62.72
26	2500	62.61
27	2600	64.58
28	2700	64.09
29	2800	64.95
30	2900	63.41
31	3000	64.39
32	3100	63.30
33	3200	64.27
34	3300	63.17
35	3400	66.70
36	3500	65.07
37	3600	64.29
38	3700	62.93
39	3800	63.69
40	3900	64.02
41	4000	64.53
42	4100	63.64
43	4200	62.81
44	4300	62.54
45	4400	63.71
46	4500	63.31
47	4600	62.73
48	4700	66.49
49	4800	65.05
50	4900	63.59

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 New York City (40.71427, -74.00597). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	5,585.2 km
Vacuum RTT floor	37.26 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	54.69 ms
Low-latency fiber material floor	54.48 ms
Engineering floor (5% path allowance)	57.44 ms
Research 1.33× mapped-fiber reference	72.74 ms
Estimated unamplified path loss	1172.9 dB
Transparent optical spans / inline amplifiers	74 / 73
Published RTT inflation over fiber floor	1.16×

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	62.2 ms
Average RTT	63.5 ms
Maximum RTT	66.7 ms
Standard deviation	0.99 ms
Stdev / average	1.6%

RTT trend

Estimated route stability across the selected time window.

Average: 63.4 ms
Minimum: 62.9 ms
Maximum: 64.2 ms
Average loss: 0.02%

Route Context

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

Reverse direction

New York to London latency and RTT — 64.3 ms

Fastest routes departing London (LON)

London to Amsterdam latency and RTT — 5.1 ms
London to Paris latency and RTT — 7.1 ms
London to Frankfurt latency and RTT — 12.3 ms
London to Berlin latency and RTT — 16.2 ms
London to Marseille latency and RTT — 24.9 ms

Fastest routes arriving at New York (NYC)

Ashburn to New York latency and RTT — 6 ms
Miami to New York latency and RTT — 34 ms
Los Angeles to New York latency and RTT — 59 ms
Seattle to New York latency and RTT — 59 ms
Amsterdam to New York latency and RTT — 68.2 ms

Same corridor (Europe → North America)

Paris to New York latency and RTT — 68.6 ms
London to Ashburn latency and RTT — 71.3 ms
Frankfurt to New York latency and RTT — 73.6 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/lon-nyc.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, London → New York 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.

London, UK → New York, USA RTT