# Amsterdam, Netherlands → London, UK RTT

🇳🇱 **Amsterdam, Netherlands (AMS)** → 🇬🇧 **London, UK (LON)**

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

In the 2026-08-16T04:07:28Z round, ICMP echo probes from Amsterdam, Netherlands to London, UK averaged 5.2 ms across 50 samples, with a minimum of 4.89 ms and a maximum of 5.85 ms. Zero packet loss and 0.22 ms jitter kept the route stable for the duration of the test.

The 358 km geodesic distance has a vacuum floor of 2.39 ms and a fiber floor of 3.51 ms. At 5.2 ms average, the route sits 1.48 times above the fiber floor and reaches 67.4% fiber efficiency, a solid result over a relatively short cross-border span.

This route ranks first among 19 outbound paths measured from Amsterdam in the same round. Its 0.25 ms standard deviation is about 4.8% of the 5.2 ms average, above the 3.28% route-set median standard-deviation-to-average ratio, yet with zero loss and a sub-millisecond spread the route remained consistent throughout the measurement window.

## Latency Summary

| Metric               | Value                                          |
| -------------------- | ---------------------------------------------- |
| RTT                  | **5.2 ms**                                     |
| Jitter               | **0.22 ms**                                    |
| Packet Loss          | **0%**                                         |
| Standard Fiber Floor | **3.51 ms**                                    |
| Fiber Efficiency     | **67.4%**                                      |
| Latency Tier         | Ultra-Low                                      |
| Source Region        | [Europe](/docs/network/latency/regions/europe) |
| Destination Region   | [Europe](/docs/network/latency/regions/europe) |

## 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.

## 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](#about-this-measurement) for citation guidance.

## Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for [Amsterdam](https://www.geonames.org/2759794) (52.37403, 4.88969) and [London](https://www.geonames.org/2643743) (51.50853, -0.12574). It does not disclose either facility address.

| Physical Reference                            | Value       |
| --------------------------------------------- | ----------- |
| WGS-84 geodesic distance                      | **358 km**  |
| Vacuum RTT floor                              | **2.39 ms** |
| Standard fiber RTT floor ($n_g=1.4679$)       | **3.51 ms** |
| Low-latency fiber material floor              | **3.49 ms** |
| Engineering floor (5% path allowance)         | **3.68 ms** |
| Research 1.33× mapped-fiber reference         | **4.66 ms** |
| Estimated unamplified path loss               | **75.2 dB** |
| Transparent optical spans / inline amplifiers | **5 / 4**   |
| Published RTT inflation over fiber floor      | **1.48×**   |

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](/docs/network/latency/theoretical-fiber-latency).

## 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        | **4.89 ms** |
| Average RTT        | **5.2 ms**  |
| Maximum RTT        | **5.85 ms** |
| Standard deviation | **0.25 ms** |
| Stdev / average    | **4.8%**    |

## Route Context

* Departure PoP: [Amsterdam (AMS)](/docs/network/latency/ams-amsterdam)
* Destination PoP: [London (LON)](/docs/network/latency/lon-london)
* Region overview: [Europe](/docs/network/latency/regions/europe) → [Europe](/docs/network/latency/regions/europe)
* Full global matrix: [Backbone Latency Matrix](/docs/network/latency)
* Physical methodology: [Theoretical Fiber Latency](/docs/network/latency/theoretical-fiber-latency)

## Related City-Pair Routes

**Reverse direction**

* [London to Amsterdam latency and RTT](/docs/network/latency/pairs/lon-ams-rtt) — 5.2 ms

**Fastest routes departing Amsterdam (AMS)**

* [Amsterdam to Frankfurt latency and RTT](/docs/network/latency/pairs/ams-fra-rtt) — 5.9 ms
* [Amsterdam to Paris latency and RTT](/docs/network/latency/pairs/ams-par-rtt) — 7 ms
* [Amsterdam to Berlin latency and RTT](/docs/network/latency/pairs/ams-ber-rtt) — 7.2 ms
* [Amsterdam to Marseille latency and RTT](/docs/network/latency/pairs/ams-mrs-rtt) — 19.6 ms
* [Amsterdam to Moscow latency and RTT](/docs/network/latency/pairs/ams-mow-rtt) — 38.1 ms

**Fastest routes arriving at London (LON)**

* [Paris to London latency and RTT](/docs/network/latency/pairs/par-lon-rtt) — 6.4 ms
* [Frankfurt to London latency and RTT](/docs/network/latency/pairs/fra-lon-rtt) — 12.9 ms
* [Berlin to London latency and RTT](/docs/network/latency/pairs/ber-lon-rtt) — 15.2 ms
* [Marseille to London latency and RTT](/docs/network/latency/pairs/mrs-lon-rtt) — 18.9 ms
* [Moscow to London latency and RTT](/docs/network/latency/pairs/mow-lon-rtt) — 42.4 ms

**Same corridor (Europe → Europe)**

* [Frankfurt to Amsterdam latency and RTT](/docs/network/latency/pairs/fra-ams-rtt) — 5.9 ms
* [Berlin to Frankfurt latency and RTT](/docs/network/latency/pairs/ber-fra-rtt) — 6.1 ms
* [Frankfurt to Berlin latency and RTT](/docs/network/latency/pairs/fra-ber-rtt) — 6.1 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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/ams-lon.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Amsterdam → London round 2026-08-16T04:07:28Z, CC BY 4.0".

***

*Data auto-generated on August 16, 2026. Explore the [full interactive latency matrix](/docs/network/latency) or browse more [city-pair routes](/docs/network/latency/pairs).*

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## License and attribution

- **Canonical source:** [View the human-readable HTML page](https://hatsnet.io/docs/network/latency/pairs/ams-lon-rtt).
- **Original documentation:** © Hats Network Inc., licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
- **Public latency data:** © Hats Network Inc., licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
- **Full terms:** [Content and Data License](https://hatsnet.io/docs/legal/content-and-data-license) — includes attribution requirements, third-party material, trademarks, source code and other exclusions.