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%).
During the past seven days up to , the London Underground and Overground network came in at 77.8% reliability across all hours - pretty decent. The Liberty line led the way, closely followed by the Suffragette line, with the District line and the Circle line experiencing the most delays. During peak hours*, reliability was slightly higher at 85.3%.
Across the Tube network specifically, reliability worked out at 71.5%, while the Overground lines averaged 91.7% - the Overground having the better week. The Piccadilly line notably improved, averaging 86.3% over the past week compared to 43.5% over the previous month. The Elizabeth line saw a notable dip, averaging 60.0% over the past week compared to 78.8% over the previous month.
Taking the 30-day period ending , the network averaged 78.3% overall - broadly fair. The Liberty line led the way at 100.0%, with the Piccadilly line the most delayed at 43.5%. During peak hours*, the Tube and Overground sat at 84.7%, 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 99.8%, while the Tram has been the most delayed at 55.1%. The network as a whole sat at 79.7% reliability across all hours. During peak hours*, reliability was slightly higher at 83.3%. The Tube averaged 77.8% 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 (86%), worst: Sun (63.8%).