ICMP RTT data for Seattle, USA to Paris, France: average, min, max, jitter and loss from 50 echo requests in a single round.

🇺🇸 Seattle, USA (SEA) → 🇫🇷 Paris, France (PAR)

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

In the 2026-08-16T04:07:28Z measurement round, 50 ICMP echo probes from Seattle, USA to Paris, France returned an average RTT of 129.2 ms, with a tight range of 126.7 ms to 135.02 ms. Zero packet loss and 1.78 ms jitter put this route in the Good latency tier.

This route was ranked 9th among the 19 Seattle outbound routes measured in the same round. Its standard deviation of 2.13 ms is only about 1.65% of the average, well below the 3.28% median variability for the route set.

With a geodesic distance of 8,065.2 km and a theoretical fiber floor of 78.98 ms, the observed RTT is 1.64 times the floor and equals 61.1% fiber efficiency. The very stable RTT, low jitter, and zero loss make this a steady long-haul ICMP measurement route from Seattle to Paris.

Latency Summary

Metric	Value
RTT	129.2 ms
Jitter	1.78 ms
Packet Loss	0%
Standard Fiber Floor	78.98 ms
Fiber Efficiency	61.1%
Latency Tier	Good
Source Region	North America
Destination Region	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.

Ping series: SEA → PAR

50 ICMP echo samples at 100 ms intervals · round 2026-08-16T04:07:28Z · avg 129.2 ± 0.30 ms (SE)

Sample distribution: box = interquartile range (127.6–130.2 ms), median 128.4 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 (79.0 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	129.69
2	100	128.06
3	200	127.59
4	300	128.26
5	400	127.28
6	500	127.02
7	600	129.05
8	700	127.37
9	800	127.03
10	900	127.97
11	1000	130.25
12	1100	127.90
13	1200	129.09
14	1300	131.21
15	1400	128.42
16	1500	130.65
17	1600	129.11
18	1700	130.95
19	1800	128.84
20	1900	127.48
21	2000	127.78
22	2100	134.85
23	2200	129.98
24	2300	132.59
25	2400	129.73
26	2500	128.57
27	2600	127.51
28	2700	129.87
29	2800	127.61
30	2900	135.02
31	3000	132.96
32	3100	132.59
33	3200	132.58
34	3300	130.68
35	3400	128.78
36	3500	134.17
37	3600	130.01
38	3700	130.56
39	3800	128.00
40	3900	127.21
41	4000	128.21
42	4100	128.29
43	4200	127.97
44	4300	126.95
45	4400	127.84
46	4500	127.39
47	4600	126.70
48	4700	127.24
49	4800	126.83
50	4900	128.31

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 Seattle (47.60621, -122.33207) and Paris (48.85341, 2.34880). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	8,065.2 km
Vacuum RTT floor	53.8 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	78.98 ms
Low-latency fiber material floor	78.66 ms
Engineering floor (5% path allowance)	82.94 ms
Research 1.33× mapped-fiber reference	105.04 ms
Estimated unamplified path loss	1693.7 dB
Transparent optical spans / inline amplifiers	106 / 105
Published RTT inflation over fiber floor	1.64×

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:

Round Statistic	Value
Minimum RTT	126.7 ms
Average RTT	129.2 ms
Maximum RTT	135.02 ms
Standard deviation	2.13 ms
Stdev / average	1.6%

RTT trend

Estimated route stability across the selected time window.

Average: 129.2 ms
Minimum: 127.8 ms
Maximum: 130.5 ms
Average loss: 0.03%

Route Context

Departure PoP: Seattle (SEA)
Destination PoP: Paris (PAR)
Region overview: North America → Europe
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Paris to Seattle latency and RTT — 128 ms

Fastest routes departing Seattle (SEA)

Seattle to Los Angeles latency and RTT — 25.9 ms
Seattle to New York latency and RTT — 59.5 ms
Seattle to Ashburn latency and RTT — 61.5 ms
Seattle to Miami latency and RTT — 81.7 ms
Seattle to Tokyo latency and RTT — 85 ms

Fastest routes arriving at Paris (PAR)

London to Paris latency and RTT — 6.4 ms
Amsterdam to Paris latency and RTT — 7 ms
Frankfurt to Paris latency and RTT — 7.6 ms
Marseille to Paris latency and RTT — 8.9 ms
Berlin to Paris latency and RTT — 15.6 ms

Same corridor (North America → Europe)

New York to London latency and RTT — 63.5 ms
New York to Amsterdam latency and RTT — 68.7 ms
New York to Paris 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/sea-par.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Seattle → Paris round 2026-08-16T04:07:28Z, CC BY 4.0".

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

Seattle, USA → Paris, France RTT