298
Usually an Alexander Dennis Adl Enviro 400.

77% 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.
The weekly figures

The share of departures that left on time.

Week endingArnos Grove StationPotters Bar Station
21 Jun 2025no datano data
28 Jun 202599%81%
5 Jul 202583% thin70% thin
12 Jul 202595% thin78% thin
19 Jul 202596%88%
26 Jul 202598%85%
2 Aug 202595%83%
9 Aug 202595%87%
16 Aug 202590%64%
23 Aug 202594%81%
30 Aug 202577%78%
6 Sept 202588%74%
13 Sept 202579%41%
20 Sept 202588%80%
27 Sept 202565%77%
4 Oct 202591%71%
11 Oct 202581%74%
18 Oct 202591%74%
25 Oct 202572%71%
1 Nov 202584%65%
8 Nov 202566%57%
15 Nov 202591% thin73% thin
22 Nov 202586% thin72% thin
29 Nov 202582%61%
6 Dec 202570%43%
13 Dec 202580%59%
20 Dec 202588%78%
27 Dec 202585% thin74% thin
3 Jan 202689%82%
10 Jan 202682%65%
17 Jan 202674%55%
24 Jan 202677%67%
31 Jan 202690%59%
7 Feb 202687%65%
14 Feb 202680%62%
21 Feb 2026no datano data
28 Feb 2026no datano data
7 Mar 202678%53%
14 Mar 202685%64%
21 Mar 202684%53%
28 Mar 202675%58%
4 Apr 202690%77%
11 Apr 202673%54%
18 Apr 202689%39%
25 Apr 202662% thin64% thin
2 May 202674%47%
9 May 202691%51%
16 May 202684%60%
23 May 202684%58%
30 May 202685%58%
6 Jun 202685%74%
13 Jun 202684%67%
20 Jun 202689%63%
27 Jun 202691%61%
4 Jul 2026no datano data
11 Jul 202685%60%
18 Jul 202680%69%
25 Jul 202683%75%
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 202682%54%
12 Sept 202677%53%
19 Sept 202681%57%
26 Sept 202684%73%
3 Oct 202682%60%
10 Oct 202689%65%
17 Oct 202683%71%

A passenger going by the timetable at Potters Bar Station would find about three departures in ten leaving more than 2.5 minutes early or 5 minutes late.

Arnos Grove Station
On time
83%
Cut short
1.2%
Potters Bar Station
On time
71%
Cut short
0.9%

64 minutes was the longest gap between buses this week, at Highview Gardens towards Arnos Grove Station, on Sunday 11 October from 20:49 to 21:53. This excludes any gaps caused by holes in our own data. Watch it happen →

Journeys cut short

Last week: 1.0% 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 Arnos Grove Station

Last week, 1 of 348 journeys (0%) were turned short.

  • Park Avenue7.3 km short of the end 1

towards Potters Bar Station

Last week, 6 of 350 journeys (2%) were turned short.

  • Cockfosters Station6.5 km short of the end 2
  • Beech Hill4.7 km short of the end 1
  • Coombehurst Close5.5 km short of the end 1
  • Slopers Pond Farm3.8 km short of the end 1
  • Wagon Road4.1 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 202674% 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
  • Arnos Grove Station: 223 departures seen
  • Potters Bar Station: 226 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.