# Ashburn, USA → Los Angeles, USA RTT

🇺🇸 **Ashburn, USA (IAD)** → 🇺🇸 **Los Angeles, USA (LAX)**

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

For the 2026-08-16T04:07:28Z run, ICMP probes from Ashburn to Los Angeles averaged 60.7 ms across 50 samples, with a minimum of 58.56 ms and a maximum of 67.73 ms. All 50 probes returned without loss, and the 1.84 ms standard deviation kept jitter at 1.64 ms, making the route steady across the measurement window.

The 3,660.1 km great-circle distance defines a 24.42 ms vacuum-latency floor and a 35.84 ms realistic fiber floor. At 60.7 ms, the route is about 1.69 times the fiber floor, or 59% fiber efficiency, so there is meaningful excess delay beyond the ideal straight-line fiber path.

This route is ranked 3rd by RTT among the 19 outbound paths measured from the same starting point, putting it near the fast end of the set. The median standard-deviation-to-average ratio for outbound paths from this starting point is 3.28%, and the observed standard deviation of 1.84 ms is a small fraction of the 60.7 ms average, so the route is both fast and consistent; however, ICMP RTT should not be used as a proxy for end-user application performance.

## Latency Summary

| Metric               | Value                                                        |
| -------------------- | ------------------------------------------------------------ |
| RTT                  | **60.7 ms**                                                  |
| Jitter               | **1.64 ms**                                                  |
| Packet Loss          | **0%**                                                       |
| Standard Fiber Floor | **35.84 ms**                                                 |
| Fiber Efficiency     | **59%**                                                      |
| Latency Tier         | Excellent                                                    |
| Source Region        | [North America](/docs/network/latency/regions/north-america) |
| 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 [Ashburn](https://www.geonames.org/4744870) (39.04372, -77.48749) and [Los Angeles](https://www.geonames.org/5368361) (34.05223, -118.24368). It does not disclose either facility address.

| Physical Reference                            | Value          |
| --------------------------------------------- | -------------- |
| WGS-84 geodesic distance                      | **3,660.1 km** |
| Vacuum RTT floor                              | **24.42 ms**   |
| Standard fiber RTT floor ($n_g=1.4679$)       | **35.84 ms**   |
| Low-latency fiber material floor              | **35.7 ms**    |
| Engineering floor (5% path allowance)         | **37.64 ms**   |
| Research 1.33× mapped-fiber reference         | **47.67 ms**   |
| Estimated unamplified path loss               | **768.6 dB**   |
| Transparent optical spans / inline amplifiers | **49 / 48**    |
| Published RTT inflation over fiber floor      | **1.69×**      |

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        | **58.56 ms** |
| Average RTT        | **60.7 ms**  |
| Maximum RTT        | **67.73 ms** |
| Standard deviation | **1.84 ms**  |
| Stdev / average    | **3.0%**     |

## Route Context

* Departure PoP: [Ashburn (IAD)](/docs/network/latency/iad-ashburn)
* Destination PoP: [Los Angeles (LAX)](/docs/network/latency/lax-los-angeles)
* Region overview: [North America](/docs/network/latency/regions/north-america) → [North America](/docs/network/latency/regions/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**

* [Los Angeles to Ashburn latency and RTT](/docs/network/latency/pairs/lax-iad-rtt) — 60.4 ms

**Fastest routes departing Ashburn (IAD)**

* [Ashburn to New York latency and RTT](/docs/network/latency/pairs/iad-nyc-rtt) — 6 ms
* [Ashburn to Miami latency and RTT](/docs/network/latency/pairs/iad-mia-rtt) — 27.4 ms
* [Ashburn to Seattle latency and RTT](/docs/network/latency/pairs/iad-sea-rtt) — 62.3 ms
* [Ashburn to London latency and RTT](/docs/network/latency/pairs/iad-lon-rtt) — 70.3 ms
* [Ashburn to Amsterdam latency and RTT](/docs/network/latency/pairs/iad-ams-rtt) — 75.2 ms

**Fastest routes arriving at Los Angeles (LAX)**

* [Seattle to Los Angeles latency and RTT](/docs/network/latency/pairs/sea-lax-rtt) — 25.9 ms
* [Miami to Los Angeles latency and RTT](/docs/network/latency/pairs/mia-lax-rtt) — 56.8 ms
* [New York to Los Angeles latency and RTT](/docs/network/latency/pairs/nyc-lax-rtt) — 58.9 ms
* [Tokyo to Los Angeles latency and RTT](/docs/network/latency/pairs/tyo-lax-rtt) — 101.2 ms
* [London to Los Angeles latency and RTT](/docs/network/latency/pairs/lon-lax-rtt) — 127.5 ms

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

* [New York to Ashburn latency and RTT](/docs/network/latency/pairs/nyc-iad-rtt) — 6 ms
* [Los Angeles to Seattle latency and RTT](/docs/network/latency/pairs/lax-sea-rtt) — 26.9 ms
* [Miami to Ashburn latency and RTT](/docs/network/latency/pairs/mia-iad-rtt) — 27.3 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](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/iad-lax.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Ashburn → Los Angeles 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/iad-lax-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.