USPS First Class Package International Service Delivery Time from San Antonio Texas US to London UK

Parcel was shipped via USPS First Class Package International Service from San Antonio Texas on the 14 Aug 2017 and delivered to the destination address in London UK on the 07 September 2017 which took about 24 days or 3 weeks delivery time. Not very fast but it's arrived as expected. Below is the tracking info from USPS post office and Royal Mail UK tracking

USPS Post Office Tracking Number: LF116963251US

Delivered
Product & Tracking Information

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Postal Product:
First-Class Package International Service
Features:
Small Packet

DATE & TIME STATUS OF ITEM LOCATION
September 7, 2017, 8:20 am Delivered UNITED KINGDOM
Your item was delivered in UNITED KINGDOM at 8:20 am on September 7, 2017.
August 23, 2017, 6:27 am Attempted Delivery - Scheduled for another delivery attempt today UNITED KINGDOM
August 22, 2017, 9:27 am Processed Through Facility UNITED KINGDOM
August 22, 2017, 8:25 am Processed Through Facility UNITED KINGDOM
August 19, 2017, 7:28 am Departed LONDON, UNITED KINGDOM
August 18, 2017, 5:17 pm Departed CHICAGO, UNITED STATES
August 18, 2017, 11:43 am Arrived CHICAGO, UNITED STATES
August 18, 2017, 5:30 am Processed Through Facility ISC CHICAGO IL (USPS)
August 17, 2017, 11:54 pm Departed USPS Regional Facility CHICAGO IL INTERNATIONAL DISTRIBUTION CENTER
August 17, 2017, 11:54 pm Arrived at USPS Regional Facility CHICAGO IL INTERNATIONAL DISTRIBUTION CENTER
August 17, 2017, 11:54 am Arrived at Facility ISC CHICAGO IL (USPS)
August 17, 2017, 9:52 am In Transit to Destination
August 16, 2017, 12:52 am Departed USPS Regional Facility SAN ANTONIO TX DISTRIBUTION CENTER
August 16, 2017, 12:50 am Arrived at USPS Regional Facility SAN ANTONIO TX DISTRIBUTION CENTER
August 15, 2017, 11:35 pm Accepted at USPS Origin Facility SAN ANTONIO, TX 78210
August 14, 2017 Pre-Shipment Info Sent to USPS, USPS Awaiting Item

Royal Mail Tracking Number:
Item:
LF116963251US
from USA
Latest update: Delivered
Your item, posted on 22/08/17 with reference LF116963251US was delivered in EAST HAM PDO on 07/09/17.

Date Time Status Track point
07/09/17 08:20 RECIPIENT COLLECTED 07/09/17 EAST HAM PDO
23/08/17 06:27 ON DELIVERY EAST HAM PDO
23/08/17 01:59 ARRIVED AT ROMFORD MAIL CENTRE ROMFORD MAIL CENTRE
23/08/17 01:53 ON ITS WAY TO EAST HAM PDO ROMFORD MAIL CENTRE
22/08/17 09:27 ON ITS WAY TO ROMFORD MAIL CENTRE HEATHROW WORLDWIDE DC
22/08/17 08:25 ARRIVED IN THE UK HEATHROW WORLDWIDE DC