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 76.8% reliability across all hours - pretty decent. The Liberty line led the way, closely followed by the Weaver line, with the Elizabeth line and the Central line experiencing the most delays. During peak hours*, reliability was broadly similar at 75.3%.
Across the Tube network specifically, reliability worked out at 72.4%, while the Overground lines averaged 89.2% - the Overground having the better week. The Tram notably improved, averaging 84.8% over the past week compared to 37.1% over the previous month. The Elizabeth line saw a notable dip, averaging 26.1% over the past week compared to 69.4% over the previous month.
Taking the 30-day period ending , the network averaged 72.4% overall - rather patchy. The Liberty line led the way at 99.9%, with the Tram the most delayed at 37.1%. During peak hours*, the Tube and Overground sat at 73.8%, broadly matching 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 Piccadilly line has been the most delayed at 57.4%. The network as a whole sat at 79.1% reliability across all hours. During peak hours*, reliability was slightly higher at 82.2%. The Tube averaged 75.8% on average, behind the Overground at 86.8%.
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: Sun (81.3%), worst: Sat (65.1%).