Ashburn to Tokyo ping and RTT: 149 ms, 5.22 ms jitter, 106.69 ms fiber floor, and 71.6% efficiency across AS203314. Updated 2026-08-09.

🇺🇸 This page compares the published ping and round-trip time (RTT) from Ashburn (IAD) to 🇯🇵 Tokyo (TYO) with vacuum and optical-fiber physical limits.

As of August 9, 2026, the Ashburn → Tokyo route on Hats Network averages 149 ms RTT across a 50-sample daily ICMP echo measurement round (source: GSL), 1.4× the theoretical fiber-floor limit of 106.69 ms.

Among the 19 measured routes departing Ashburn, this route ranks 13th fastest by average RTT.

With a stdev-to-average ratio of 4.1%, this route fluctuates more than the network median of 3.4%, so short congestion windows can surface as transient RTT spikes. Across the round, per-probe RTT ranged from 140.83 ms to 168.03 ms with a standard deviation of 6.08 ms.

Latency Summary

Metric	Value
RTT	149 ms
Jitter	5.22 ms
Packet Loss	0%
Standard Fiber Floor	106.69 ms
Fiber Efficiency	71.6%
Latency Tier	Good
Source Region	North America
Destination Region	Asia Pacific

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: IAD → TYO

50 ICMP echo samples at 100 ms intervals · round 2026-08-09 · avg 149.0 ± 0.86 ms (SE)

Sample distribution: box = interquartile range (144.3–152.2 ms), median 148.2 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 (106.7 ms) for this route.

Full 50-sample dataset

Seq	Offset (ms)	RTT (ms)
1	0	147.99
2	100	143.37
3	200	146.47
4	300	158.28
5	400	168.03
6	500	159.37
7	600	147.27
8	700	152.50
9	800	156.42
10	900	149.14
11	1000	152.25
12	1100	157.03
13	1200	148.28
14	1300	143.24
15	1400	149.68
16	1500	149.39
17	1600	148.84
18	1700	149.67
19	1800	165.06
20	1900	148.76
21	2000	145.76
22	2100	144.04
23	2200	142.15
24	2300	149.51
25	2400	155.02
26	2500	152.14
27	2600	147.89
28	2700	149.86
29	2800	148.87
30	2900	143.34
31	3000	144.80
32	3100	143.61
33	3200	141.53
34	3300	141.00
35	3400	140.83
36	3500	145.43
37	3600	158.65
38	3700	156.82
39	3800	148.04
40	3900	144.89
41	4000	143.39
42	4100	153.36
43	4200	145.39
44	4300	142.15
45	4400	153.06
46	4500	145.55
47	4600	150.94
48	4700	145.19
49	4800	144.18
50	4900	141.57

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 Ashburn (39.04372, -77.48749) and Tokyo (35.68950, 139.69171). It does not disclose either facility address.

Physical Reference	Value
WGS-84 geodesic distance	10,894.6 km
Vacuum RTT floor	72.68 ms
Standard fiber RTT floor ( $n_g=1.4679$ )	106.69 ms
Low-latency fiber material floor	106.26 ms
Engineering floor (5% path allowance)	112.04 ms
Research 1.33× mapped-fiber reference	141.9 ms
Estimated unamplified path loss	2287.9 dB
Transparent optical spans / inline amplifiers	143 / 142
Published RTT inflation over fiber floor	1.4×

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 (2026-08-09) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

Round Statistic	Value
Minimum RTT	140.83 ms
Average RTT	149 ms
Maximum RTT	168.03 ms
Standard deviation	6.08 ms
Stdev / average	4.1%

RTT trend

Estimated route stability across the selected time window.

Average: 148.9 ms
Minimum: 147.4 ms
Maximum: 150.3 ms
Average loss: 0.02%

Route Context

Departure PoP: Ashburn (IAD)
Destination PoP: Tokyo (TYO)
Region overview: North America → Asia Pacific
Corridor overview: North America to Asia Pacific
Full global matrix: Backbone Latency Matrix
Physical methodology: Theoretical Fiber Latency

Reverse direction

Tokyo to Ashburn latency and RTT — 151.1 ms

Fastest routes departing Ashburn (IAD)

Ashburn to New York latency and RTT — 6.1 ms
Ashburn to Miami latency and RTT — 27.9 ms
Ashburn to Los Angeles latency and RTT — 59.8 ms
Ashburn to Seattle latency and RTT — 62.3 ms
Ashburn to London latency and RTT — 70.3 ms

Fastest routes arriving at Tokyo (TYO)

Taipei to Tokyo latency and RTT — 31.2 ms
Hong Kong to Tokyo latency and RTT — 44.9 ms
Singapore to Tokyo latency and RTT — 69.8 ms
Seattle to Tokyo latency and RTT — 84.6 ms
Los Angeles to Tokyo latency and RTT — 100.8 ms

Same corridor (North America → Asia Pacific)

Seattle to Taipei latency and RTT — 117.1 ms
Seattle to Hong Kong latency and RTT — 131.1 ms
Los Angeles to Taipei latency and RTT — 132.1 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. Per-pair files are available at /opendata/latency/latest/pairs/iad-tyo.pings.{csv,json,yaml}. When citing, include the route, the measurement round date, and the dataset version — for example: "Hats Network latency dataset, Ashburn → Tokyo round 2026-08-09, CC BY 4.0".

Data auto-generated on August 9, 2026. Explore the full interactive latency matrix or browse more city-pair routes.

Ashburn to Tokyo Latency, Ping & RTT | AS203314