Length — 49km (walked 2018)
This section turns out to link the first two headquarters of the Royal Flying Corps, which became the Royal Air Force. Biggin Hill was chosen to replace the original RFC site at Joyce Green. After the first section, which contains the final switchbacks of the Croydon Basin, the route descends to the Thames, gradually losing height.
| 38: Leaves Green to Cudham — 7.68km; 154m ascent Predominantly fieldpaths and woodland walking | Map Directions |
| 39: Cudham to Chelsfield station — 7.09km; 61m ascent Mainly footoaths with a few streets at the end | Map Directions |
| 40: Chelsfield station to Chelsfield village — 4.75km; 63m ascent Parkland, woodland, and some streets | Map Directions |
| 41: Chelsfield village to Swanley — 8.04km; 79m ascent Largely paths and lanes, with a few streets at Crockenhill | Map Directions |
| 42: Swanley to Baldwyns Park — 7.66km; 91m ascent Woodland paths, bookended by a few streets | Map Directions |
| 43: Baldwyns Park to Barnes Cray — 5.78km; 88m ascent Mainly suburban streets, with Dartford Heath as a sandwich | Map Directions |
| 44: Barnes Cray to Erith station — 7.93km; 66m ascent Persist beyond the ugly start for riverside walking, with streets in Erith | Map Directions |
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