Which Tube and Overground lines are the most delayed? Historical delay data, performance trends, and reliability rankings for all lines
Track performance across all London Underground and Overground lines with historical reliability data. Compare which Tube lines experience the most delays and service disruptions, view hourly patterns throughout the day, and see how reliability has changed over time. Looking for what's happening right now? See the live line status page. Need lift status? See our step-free access alerts.
All London Underground and Overground lines ranked by average reliability within the selected time range.
Horizontal comparison of all line reliability. Green (≥ 95%), orange (≥ 85%), red (≥ 70%), dark red (< 70%).
In the week ending , the London Underground and Overground network sat at 87.6% reliability across all hours - fairly good. The Waterloo & City line led the way, closely followed by the Liberty line, with the Piccadilly line and the District line experiencing the most delays. During peak hours*, reliability was slightly higher at 91.6%.
Across the Tube network specifically, reliability came in at 83.2%, while the Overground lines worked out at 90.9% - with the Overground ahead of the Underground. The DLR notably improved, averaging 99.2% over the past week compared to 72.7% over the previous month.
Across the past month, from to , the network worked out at 77.2% overall - broadly fair. The Liberty line led the way at 99.6%, with the Piccadilly line the most delayed at 46.1%. During peak hours*, the Tube and Overground averaged 79.6%, edging slightly above the all-hours figure.
Over the past year, from to , the Liberty line has been the most reliable on the network at 99.7%, while the Piccadilly line has been the most delayed at 59.0%. The network as a whole averaged 79.8% reliability across all hours. During peak hours*, reliability was slightly higher at 83.0%. The Tube worked out at 75.9% on average, behind the Overground at 88.1%.
Get free email alerts when there are delays on your lines →Click lines to compare. First 3 shown by default.
Overall network average reliability across all Underground and Overground lines over the last 12 months.
Average line reliability by hour (0-23) based on 60-day rolling average. Scroll horizontally on mobile.
Network average over 90 days. Best: Tue (84.2%), worst: Sat (68.6%).