London, UK → Miami, USA RTT

🇬🇧 London, UK (LON) → 🇺🇸 Miami, USA (MIA)

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

For the 2026-08-16T04:07:28Z measurement round, London-to-Miami ICMP echo RTT averaged 101.9ms, with a minimum of 97.83ms, a maximum of 115.14ms, and no packet loss across 50 samples.

The 101.9ms average is 1.46 times the theoretical fiber-floor time for the 7,138.4km geodesic distance, corresponding to 68.6% fiber efficiency. The route's standard deviation is about 3.8% of its average, above the 3.28% median for the 19-route set, and it ranked 9th among those routes in this cycle.

Given that the fiber floor for 7,138.4km is 69.9ms and the observed average is 101.9ms, the route behaves as the distance would suggest. The wider relative standard deviation is the main thing to watch, but zero packet loss keeps the measurement clean.

Latency Summary

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.

Sample distribution: box = interquartile range (99.3–103.2 ms), median 100.8 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 (69.9 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	100.24
2	100	100.11
3	200	98.68
4	300	97.83
5	400	100.73
6	500	106.12
7	600	102.90
8	700	99.16
9	800	98.81
10	900	98.58
11	1000	103.26
12	1100	101.13
13	1200	105.03
14	1300	104.31
15	1400	100.82
16	1500	98.70
17	1600	101.00
18	1700	104.11
19	1800	102.86
20	1900	101.92
21	2000	102.32
22	2100	100.86
23	2200	99.70
24	2300	111.20
25	2400	115.14
26	2500	104.42
27	2600	100.19
28	2700	98.18
29	2800	99.19
30	2900	97.92
31	3000	114.35
32	3100	103.11
33	3200	99.70
34	3300	98.27
35	3400	99.95
36	3500	101.69
37	3600	100.30
38	3700	99.52
39	3800	101.12
40	3900	106.55
41	4000	104.69
42	4100	101.78
43	4200	100.04
44	4300	108.65
45	4400	104.16
46	4500	99.95
47	4600	99.62
48	4700	99.27
49	4800	98.46
50	4900	98.40

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.

Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for London (51.50853, -0.12574) and Miami (25.77427, -80.19366). It does not disclose either facility address.

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:

Route Context

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

Related City-Pair Routes

Reverse direction

• Miami to London latency and RTT — 101.8 ms

Fastest routes departing London (LON)

• London to Amsterdam latency and RTT — 5.2 ms
• London to Paris latency and RTT — 6.4 ms
• London to Frankfurt latency and RTT — 13.6 ms
• London to Berlin latency and RTT — 16.2 ms
• London to Marseille latency and RTT — 17.9 ms

Fastest routes arriving at Miami (MIA)

• Ashburn to Miami latency and RTT — 27.4 ms
• New York to Miami latency and RTT — 32.9 ms
• Los Angeles to Miami latency and RTT — 57.3 ms
• São Paulo to Miami latency and RTT — 74 ms
• Seattle to Miami latency and RTT — 81.7 ms

Same corridor (Europe → North America)

• London to New York latency and RTT — 63.8 ms
• Amsterdam to New York latency and RTT — 68.6 ms
• Paris to New York latency and RTT — 68.9 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-mia.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, London → Miami round 2026-08-16T04:07:28Z, CC BY 4.0".

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