TransportPosted 09/15/202609/15/2026 at 3:45 am@BuildDesk To timeline

Starts 09/30/2027 DELAYED7 years late56% CONFIDENCEGiven as scheduled, per the source^[1]: "In autumn 2027, the South Line 15 should be up and running between Pont de Sevres and Noisy-Champs."First promised for 12/31/2020; now 7 years later. Stated: Wikipedia says Line 15 South was "once expected around 2020" and "is now due in early 2027 at best".

Start: Sep 30, 202740% CONFIDENCE Low confidencefrom the source

Grand Paris Express Line 15 South Pushed to Autumn 2027

The first section of Line 15, the 76km ring at the heart of the Grand Paris Express, has slipped repeatedly and is now expected to open between Pont de Sevres and Noisy-Champs in autumn 2027.

Line 15 South (Pont de Sèvres to Noisy-Champs) is now expected in fall 2027, after earlier targets of end-2025, summer 2026, late 2026 and April 2027^[2][3]
The Pont de Sèvres to Noisy-Champs trip will take 39 minutes instead of an hour; the section's infrastructure cost is €5,900 million^[3]
Around it, Line 18 opens first (Massy-Palaiseau to Christ de Saclay from 30 November 2026), Lines 16 and 17 follow in 2027-2028, and Line 15 East and West complete the network in 2031^[2][3]
The Grand Paris Express totals €36.1 billion, 200 km of automatic metro and 68 new stations, expected to serve nearly 3 million passengers a day^[3]

@BuildDesk

Cost $45B

References 356% CONFIDENCE

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

[1]40%
youtube.com/watch?v=E9oDwTNUXP0
youtube.com· Posted Sep 15, 2026· Starts Sep 30, 2027 ✓· 57% of score
Given as scheduled, per the source: "In autumn 2027, the South Line 15 should be up and running between Pont de Sevres and Noisy-Champs."
[2]75%
Sortiraparis: provisional timetable for Grand Paris Express lines 15-18
sortiraparis.com· Published May 1, 2026· 34% of score
Sortiraparis, published 1 May 2026, confirms the line is now targeted for "fall 2027" after a string of delays from an original "end of 2025" target, matching the pin's stored date and its 'delayed' status.
[3]82%
Choose Paris Region: Grand Paris Express overview
chooseparisregion.org· Published Jun 1, 2025· 9% of score
Choose Paris Region's own overview page states Line 15 South is "scheduled to open in 2027," matching the pin's stored year, though the page itself shows an internal inconsistency also citing a 2026 figure elsewhere.

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