Heathrow is absolutely fantastic if you need postal services both pre-security and post-security.

Official Information

Drop Boxes

From their Web site:

Need to send a letter or postcard from Heathrow? You’ll find post boxes before and after security in each terminal.

Please be aware that you can’t post parcels using the post boxes, and that anything you do post may be inspected by HM Customs.

You’re looking for the iconic pillar box, but it may be mostly transparent for airport security purposes. This is an example in Terminal 5:

[![](https://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Transparent_pillar_box_Heathrow_Terminal_5.jpg/1024px-Transparent_pillar_box_Heathrow_Terminal_5.jpg)](https://commons.wikimedia.org/wiki/File:Transparent_pillar_box_Heathrow_Terminal_5.jpg)Heathrow Post-Security Terminal 5 Pillar Box via Wikipedia I've used the one in Terminal 5.

Pre-security Post Office!

From their Web site:

The airport Post Office is on the first floor of Terminal 3 departures, in the public area before security ( it’s near the security control entrance).

Opening hours: Monday to Saturday 09:00 – 17:30, Sunday 09:00 – 13:00.

Telephone: +44 (0)20 8897 3463

Purchasing Stamps

From their Web site:

You can buy stamps at branches of WHSmith in the terminals (post-security) and on the concourses (pre-security). There are also coin-operated stamp machines in each terminal.

Source

User-Submitted Information

Mark Lee submitted the following:

Terminal 2 postbox on arrivals concourse landslide next to Plaza Premium Lounge. Collections 1600 Monday-Friday; 1145 Saturday. Only thin letters can be posted unlike at postboxes outside the airport.

Michael Kincaid shared some valuable information regarding Terminal 3 (as of December 2023):

T3 landside: Currently, the post box airside at Terminal 3 is directly after the security area and before you enter World Duty Free and the landside post box is located on Level 1 opposite Boots.

T3 airside: despite the Heathrow website stating there should be one in all terminals, there was no sign of any postbox shown on the airside map.

WH Smith post office at T3 departures: be aware that the postal desk may not be open during all of the posted hours. When we were there it appeared the postal employee was on break. However, the shopkeeper can sell 8-packs of 2nd class stamps.

Robert submitted the following:

Terminal 4 across from the security checkpoint. Collection time is Monday-Friday 1645, Saturday 0915.

Last updated 11 November 2024