ICMP round-trip time measurement between Hong Kong, Hong Kong and Seattle, USA, with latency, jitter and packet-loss statistics for the HKG-SEA route.

🇭🇰 Hong Kong (HKG) → 🇺🇸 Seattle, USA (SEA)

Measurement round: 2026-08-15T04:03:13Z.

The 2026-08-15T04:03:13Z round measured 50 ICMP probes from Hong Kong to Seattle at an average of 129.9 ms, with all samples between 127.66 ms and 139.63 ms and zero packet loss. The 2.04 ms jitter and 2.28 ms standard deviation make this a steady route in the good latency tier.

Within the 19 outbound routes leaving Hong Kong in this round, this link ranked fifth, while its variability of about 1.8 percent of the average sat well below the 3.08 percent median across those routes.

The 78.7 percent fiber efficiency puts the measured RTT only about 27 percent above the theoretical fiber floor for the 10,436 km great-circle distance. That efficiency, combined with Hong Kong’s interconnection role and Seattle’s trans-Pacific cable landings, makes this a clean reference for trans-Pacific round-trip time.

Latency Summary

Metric	Value
RTT	129.9 ms
Jitter	2.04 ms
Packet Loss	0%
Standard Fiber Floor	102.2 ms
Fiber Efficiency	78.7%
Latency Tier	Good
Source Region	Asia Pacific
Destination Region	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.

Ping series: HKG → SEA

50 ICMP echo samples at 100 ms intervals · round 2026-08-15T04:03:13Z · avg 129.9 ± 0.32 ms (SE)

Sample distribution: box = interquartile range (128.4–130.7 ms), median 129.1 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 (102.2 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	129.89
2	100	129.91
3	200	130.75
4	300	131.28
5	400	130.56
6	500	128.87
7	600	127.75
8	700	128.65
9	800	128.07
10	900	131.63
11	1000	128.86
12	1100	128.53
13	1200	128.03
14	1300	128.36
15	1400	129.09
16	1500	128.55
17	1600	128.40
18	1700	127.69
19	1800	135.83
20	1900	131.05
21	2000	133.73
22	2100	129.88
23	2200	131.05
24	2300	128.84
25	2400	127.66
26	2500	129.28
27	2600	128.21
28	2700	131.71
29	2800	129.83
30	2900	139.63
31	3000	131.81
32	3100	128.73
33	3200	128.16
34	3300	129.21
35	3400	128.50
36	3500	129.16
37	3600	129.09
38	3700	128.26
39	3800	130.03
40	3900	128.34
41	4000	127.86
42	4100	129.04
43	4200	131.40
44	4300	133.41
45	4400	129.60
46	4500	127.96
47	4600	128.65
48	4700	134.63
49	4800	130.47
50	4900	129.12

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 Hong Kong (22.27832, 114.17469) and Seattle (47.60621, -122.33207). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	10,435.9 km
Vacuum RTT floor	69.62 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	102.2 ms
Low-latency fiber material floor	101.79 ms
Engineering floor (5% path allowance)	107.32 ms
Research 1.33× mapped-fiber reference	135.92 ms
Estimated unamplified path loss	2191.5 dB
Transparent optical spans / inline amplifiers	137 / 136
Published RTT inflation over fiber floor	1.27×

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 (2026-08-15T04:03:13Z) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

Round Statistic	Value
Minimum RTT	127.66 ms
Average RTT	129.9 ms
Maximum RTT	139.63 ms
Standard deviation	2.28 ms
Stdev / average	1.8%

RTT trend

Estimated route stability across the selected time window.

Average: 130.1 ms
Minimum: 128.9 ms
Maximum: 131.4 ms
Average loss: 0.01%

Route Context

Departure PoP: Hong Kong (HKG)
Destination PoP: Seattle (SEA)
Region overview: Asia Pacific → North America
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Seattle to Hong Kong latency and RTT — 130.7 ms

Fastest routes departing Hong Kong (HKG)

Hong Kong to Taipei latency and RTT — 15.2 ms
Hong Kong to Singapore latency and RTT — 31.2 ms
Hong Kong to Tokyo latency and RTT — 45 ms
Hong Kong to Moscow latency and RTT — 116.6 ms
Hong Kong to Sydney latency and RTT — 136.3 ms

Fastest routes arriving at Seattle (SEA)

Los Angeles to Seattle latency and RTT — 27.5 ms
New York to Seattle latency and RTT — 59 ms
Ashburn to Seattle latency and RTT — 61.3 ms
Miami to Seattle latency and RTT — 82 ms
Tokyo to Seattle latency and RTT — 84.6 ms

Same corridor (Asia Pacific → North America)

Tokyo to Los Angeles latency and RTT — 101.5 ms
Taipei to Seattle latency and RTT — 115.7 ms
Taipei to Los Angeles latency and RTT — 132.9 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/hkg-sea.pings.{csv,json,yaml}. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Hong Kong → Seattle round 2026-08-15T04:03:13Z, CC BY 4.0".

Data auto-generated on August 15, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Hong Kong → Seattle, USA RTT