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Bus route 166

Transport
166
Usually a Byd.

68% on timeof departures in the week ending 17 October 2026, leaving no more than 2.5 minutes early or 5 minutes late. Half of London's timetabled routes managed 73% or better.

The last week, day by day
Share of departures leaving on time.

Watch a day of route 166’s buses: every bus, replayed on the map. Or click a day on the chart.

The weekly figures

The share of departures that left on time.

Week endingBanstead / Marks & SpencerWest Croydon Bus Station
21 Jun 2025no datano data
28 Jun 202536%64%
5 Jul 202537% thin66% thin
12 Jul 202533% thin69% thin
19 Jul 202534%17%
26 Jul 202535%15%
2 Aug 202540%62%
9 Aug 202544%61%
16 Aug 202547%76%
23 Aug 202534%58%
30 Aug 202543%49%
6 Sept 202548%76%
13 Sept 202547%66%
20 Sept 202548%82%
27 Sept 202544%55%
4 Oct 202546%69%
11 Oct 202547%74%
18 Oct 202544%81%
25 Oct 202545%81%
1 Nov 202548%86%
8 Nov 202546%73%
15 Nov 202538% thin64% thin
22 Nov 202550% thin82% thin
29 Nov 202542%63%
6 Dec 202538%62%
13 Dec 202544%81%
20 Dec 202544%77%
27 Dec 202551% thin78% thin
3 Jan 202675%75%
10 Jan 202646%82%
17 Jan 202645%73%
24 Jan 202645%77%
31 Jan 202639%76%
7 Feb 202635%71%
14 Feb 202654%81%
21 Feb 2026no datano data
28 Feb 2026no datano data
7 Mar 202643%79%
14 Mar 202659%79%
21 Mar 202650%80%
28 Mar 202663%86%
4 Apr 202649%73%
11 Apr 202656%85%
18 Apr 202647%68%
25 Apr 202629% thin84% thin
2 May 202637%77%
9 May 202654%76%
16 May 202641%84%
23 May 202638%81%
30 May 202671%84%
6 Jun 202669%89%
13 Jun 202654%83%
20 Jun 202655%90%
27 Jun 202657%76%
4 Jul 2026no datano data
11 Jul 202648%80%
18 Jul 202657%81%
25 Jul 202641%87%
1 Aug 2026no datano data
8 Aug 2026no datano data
15 Aug 2026no datano data
22 Aug 2026no datano data
29 Aug 2026no datano data
5 Sept 202668%88%
12 Sept 202657%77%
19 Sept 202663%75%
26 Sept 202645%85%
3 Oct 202640%76%
10 Oct 202660%84%
17 Oct 202659%81%

A passenger going by the timetable at Banstead / Marks & Spencer would find about four departures in ten leaving more than 2.5 minutes early or 5 minutes late.

Banstead / Marks & Spencer
On time
59%
Cut short
0.5%
West Croydon Bus Station
On time
81%
Cut short
0.8%

62 minutes was the longest gap between buses this week, at Chipstead Valley / Rectory Lane towards West Croydon Bus Station, on Tuesday 13 October from 17:33 to 18:35. This excludes any gaps caused by holes in our own data. Watch it happen →

Journeys cut short

Last week: 0.6% of journeys were turned back before the end of the line in the week ending 17 October 2026. Everyone on board has to get off; for anyone waiting further along the route it's effectively a cancellation.

towards Epsom Hospital

Last week, 1 of 294 journeys (0%) were turned short.

  • Warham Road / Brighton Road14.1 km short of the end 1

towards West Croydon Bus Station

Last week, 3 of 357 journeys (1%) were turned short.

  • St. George's Walk0.9 km short of the end 2
  • Drift Bridge19.4 km short of the end 1

Each place is the last stop the bus was timed at before it turned round, with the typical distance it fell short of the end of the line. The five busiest are named; the rest are counted together.

Compared with TfL's own figures

QuarterTfLOurs
2025/26 Q313 Sept – 2 Jan 202677% on timeno figure
2026/27 Q11 Apr – 26 Jun 202681% on timeno figure

TfL's figures come from its own tracking equipment and its own timetable; mine are computed from the buses' public position feed. They are the same calculation on independent data, so they should broadly agree and move together rather than match exactly.

About this data
Data collected, week ending 17 October 2026
100% of the week. This is the share of the week for which we hold bus location data at all, across the whole of London rather than for this route. A week under 60% is not published; under 90% it is marked as thin.
Departures observed
  • Banstead / Marks & Spencer: 274 departures seen
  • West Croydon Bus Station: 211 departures seen
A guide to how much evidence sits behind this week's figures, not a measure of the service.
How it is measured
Every day, 05:00–23:59. On time means leaving no more than 2.5 minutes early or 5 minutes late. A day with less than four hours of data collected shows no daily figure. How these figures are made.
Gaps in the record for this period (39)

Most recent first. Hover a week on the chart and it will name the gap behind it. Most are a few missing hours on an otherwise ordinary day.

  • 17 Sept 2026 partial day, no data 12:00-12:59: our collector was down (machine off or power cut)
  • 28 Aug 2026 partial day, no data 20:00-23:59: our collector was down (machine off or power cut)
  • 29 Jul – 26 Aug 2026 no collection: the volunteer BODS archive was down and our own collector had not yet started
  • 28 Jul 2026 partial day, no data 11:00-23:59: no collection: the volunteer BODS archive was down and our own collector had not yet started
  • 7 Jul 2026 partial day, no data 15:00-15:59: gap in the volunteer BODS archive (its collector was down)
  • 5 Jul 2026 partial day, no data 06:00-11:59: gap in the volunteer BODS archive (its collector was down)
  • 4 Jul 2026 partial day, no data 06:00-21:59: gap in the volunteer BODS archive (its collector was down)
  • 2 Jul – 3 Jul 2026 gap in the volunteer BODS archive (its collector was down)
  • 8 Jun 2026 partial day, no data 07:00-08:59: gap in the volunteer BODS archive (its collector was down)
  • 7 Jun 2026 partial day, no data 12:00-12:59, 18:00-19:59: gap in the volunteer BODS archive (its collector was down)
  • 6 Jun 2026 partial day, no data 12:00-12:59, 16:00-16:59, 18:00-18:59: gap in the volunteer BODS archive (its collector was down)
  • 27 Apr 2026 partial day, no data 12:00-12:59: gap in the volunteer BODS archive (its collector was down)
  • 21 Apr 2026 partial day, no data 06:00-11:59: gap in the volunteer BODS archive (its collector was down)
  • 20 Apr 2026 partial day, no data 15:00-23:59: gap in the volunteer BODS archive (its collector was down)
  • 16 Apr 2026 partial day, no data 12:00-15:59: gap in the volunteer BODS archive (its collector was down)
  • 28 Feb 2026 partial day, no data 06:00-18:59: gap in the volunteer BODS archive (its collector was down)
  • 16 Feb – 27 Feb 2026 gap in the volunteer BODS archive (its collector was down)
  • 15 Feb 2026 partial day, no data 16:00-23:59: gap in the volunteer BODS archive (its collector was down)
  • 30 Jan 2026 partial day, no data 20:00-23:59: gap in the volunteer BODS archive (its collector was down)
  • 25 Dec 2025 no bus service on Christmas Day
  • 23 Dec 2025 partial day, no data 06:00-07:59: gap in the volunteer BODS archive (its collector was down)
  • 5 Dec 2025 partial day, no data 06:00-08:59: gap in the volunteer BODS archive (its collector was down)
  • 24 Nov 2025 partial day, no data 17:00-17:59: gap in the volunteer BODS archive (its collector was down)
  • 17 Nov 2025 partial day, no data 06:00-09:59: gap in the volunteer BODS archive (its collector was down)
  • 15 Nov – 16 Nov 2025 no London vehicles in the national feed — TfL's export to BODS was down (the volunteer archive itself was collecting)
  • 14 Nov 2025 partial day, no data 06:00-07:59, 13:00-23:59: gap in the volunteer BODS archive (its collector was down)
  • 31 Oct 2025 partial day, no data 06:00-07:59: gap in the volunteer BODS archive (its collector was down)
  • 17 Oct 2025 partial day, no data 06:00-07:59: gap in the volunteer BODS archive (its collector was down)
  • 10 Oct 2025 partial day, no data 06:00-08:59: gap in the volunteer BODS archive (its collector was down)
  • 3 Oct 2025 partial day, no data 06:00-11:59: gap in the volunteer BODS archive (its collector was down)
  • 19 Sept 2025 partial day, no data 06:00-08:59: gap in the volunteer BODS archive (its collector was down)
  • 5 Sept 2025 partial day, no data 06:00-09:59: gap in the volunteer BODS archive (its collector was down)
  • 1 Aug 2025 partial day, no data 06:00-09:59: gap in the volunteer BODS archive (its collector was down)
  • 18 Jul 2025 partial day, no data 06:00-09:59: gap in the volunteer BODS archive (its collector was down)
  • 8 Jul 2025 partial day, no data 06:00-08:59: gap in the volunteer BODS archive (its collector was down)
  • 6 Jul – 7 Jul 2025 gap in the volunteer BODS archive (its collector was down)
  • 5 Jul 2025 partial day, no data 18:00-23:59: gap in the volunteer BODS archive (its collector was down)
  • 4 Jul 2025 partial day, no data 06:00-14:59: gap in the volunteer BODS archive (its collector was down)
  • 25 Jun 2025 partial day, no data 06:00-11:59: gap in the volunteer BODS archive (its collector was down)

For latest timetable and route information, see TfL's official page.

Contains public sector information licensed under the Open Government Licence v3.0; bus data via the DfT Bus Open Data Service and Transport for London. Figures are computed from observed bus positions, every day, 05:00–23:59. How these figures are made. Bus positions from the Department for Transport’s Bus Open Data Service (BODS); the Department for Transport cannot warrant the accuracy or quality of the data published there. Positions before September 2026 come from the Bus Open Data archive generously built and kept by Open Innovations, with thanks. Route lines and stops: Powered by TfL Open Data. Contains OS data © Crown copyright and database rights 2016. Geomni UK Map data © and database rights [2019]. These pages and the bus replay are built independently from open data: Transport for London, the Department for Transport and the bus operators had no part in making them, and none of them endorses them. Not for planning a journey.