# Paris, France → Ashburn, USA RTT

🇫🇷 **Paris, France (PAR)** → 🇺🇸 **Ashburn, USA (IAD)**

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

The 2026-08-16T04:07:28Z round of 50 ICMP probes from Paris to Ashburn returned a 75.5 ms average RTT, a 2.46 ms standard deviation, and 2.26 ms jitter. No packets were lost, and the fastest reply came in at 72.75 ms while the slowest reached 85.2 ms.

That result placed the route eighth among the 19 outbound paths measured from Paris in this round. Its run-to-run spread worked out to about 3.26 percent of the average, slightly below the 3.28 percent median variability across the measured routes, so timing on the transatlantic leg stayed unusually consistent.

For a 6,202 km great-circle distance, the average sits roughly 15 ms above the 60.73 ms fiber lower bound, an inflation factor of 1.24 that corresponds to about 80 percent fiber efficiency. The zero-loss sample and narrow min-max range make this a notably stable path into the Northern Virginia corridor.

## Latency Summary

| Metric               | Value                                                        |
| -------------------- | ------------------------------------------------------------ |
| RTT                  | **75.5 ms**                                                  |
| Jitter               | **2.26 ms**                                                  |
| Packet Loss          | **0%**                                                       |
| Standard Fiber Floor | **60.73 ms**                                                 |
| Fiber Efficiency     | **80.4%**                                                    |
| Latency Tier         | Excellent                                                    |
| Source Region        | [Europe](/docs/network/latency/regions/europe)               |
| Destination Region   | [North America](/docs/network/latency/regions/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.

## 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 [Paris](https://www.geonames.org/2988507) (48.85341, 2.34880) and [Ashburn](https://www.geonames.org/4744870) (39.04372, -77.48749). It does not disclose either facility address.

| Physical Reference                            | Value         |
| --------------------------------------------- | ------------- |
| WGS-84 geodesic distance                      | **6,202 km**  |
| Vacuum RTT floor                              | **41.38 ms**  |
| Standard fiber RTT floor ($n_g=1.4679$)       | **60.73 ms**  |
| Low-latency fiber material floor              | **60.49 ms**  |
| Engineering floor (5% path allowance)         | **63.78 ms**  |
| Research 1.33× mapped-fiber reference         | **80.78 ms**  |
| Estimated unamplified path loss               | **1302.4 dB** |
| Transparent optical spans / inline amplifiers | **82 / 81**   |
| Published RTT inflation over fiber floor      | **1.24×**     |

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        | **72.75 ms** |
| Average RTT        | **75.5 ms**  |
| Maximum RTT        | **85.2 ms**  |
| Standard deviation | **2.46 ms**  |
| Stdev / average    | **3.3%**     |

## Route Context

* Departure PoP: [Paris (PAR)](/docs/network/latency/par-paris)
* Destination PoP: [Ashburn (IAD)](/docs/network/latency/iad-ashburn)
* Region overview: [Europe](/docs/network/latency/regions/europe) → [North America](/docs/network/latency/regions/north-america)
* Corridor overview: [Europe to North America](/docs/network/latency/regions/europe-to-north-america)
* 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**

* [Ashburn to Paris latency and RTT](/docs/network/latency/pairs/iad-par-rtt) — 76.1 ms

**Fastest routes departing Paris (PAR)**

* [Paris to London latency and RTT](/docs/network/latency/pairs/par-lon-rtt) — 6.4 ms
* [Paris to Amsterdam latency and RTT](/docs/network/latency/pairs/par-ams-rtt) — 7 ms
* [Paris to Frankfurt latency and RTT](/docs/network/latency/pairs/par-fra-rtt) — 7.6 ms
* [Paris to Marseille latency and RTT](/docs/network/latency/pairs/par-mrs-rtt) — 8.9 ms
* [Paris to Berlin latency and RTT](/docs/network/latency/pairs/par-ber-rtt) — 15.5 ms

**Fastest routes arriving at Ashburn (IAD)**

* [New York to Ashburn latency and RTT](/docs/network/latency/pairs/nyc-iad-rtt) — 6 ms
* [Miami to Ashburn latency and RTT](/docs/network/latency/pairs/mia-iad-rtt) — 27.3 ms
* [Los Angeles to Ashburn latency and RTT](/docs/network/latency/pairs/lax-iad-rtt) — 60.4 ms
* [Seattle to Ashburn latency and RTT](/docs/network/latency/pairs/sea-iad-rtt) — 61.5 ms
* [London to Ashburn latency and RTT](/docs/network/latency/pairs/lon-iad-rtt) — 71 ms

**Same corridor (Europe → North America)**

* [London to New York latency and RTT](/docs/network/latency/pairs/lon-nyc-rtt) — 63.8 ms
* [Amsterdam to New York latency and RTT](/docs/network/latency/pairs/ams-nyc-rtt) — 68.6 ms
* [Paris to New York latency and RTT](/docs/network/latency/pairs/par-nyc-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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/par-iad.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Paris → Ashburn 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/par-iad-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.