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 77.9% reliability across all hours - broadly fair. The Liberty line and the Waterloo & City line stood out with the best reliability, though the Tram and the Central line faced the most disruption. During peak hours*, reliability was slightly higher at 81.0%.
Across the Tube network specifically, reliability worked out at 78.9%, while the Overground lines averaged 84.6% - the Overground having the better week. The Piccadilly line notably improved, averaging 93.9% over the past week compared to 62.2% over the previous month. The Tram saw a notable dip, averaging 13.1% over the past week compared to 79.5% over the previous month.
Taking the 30-day period ending , the network averaged 79.4% overall - fairly reasonable. The Liberty line led the way at 99.8%, with the Central line the most delayed at 51.2%. During peak hours*, the Tube and Overground sat at 82.2%, edging slightly above the all-hours figure.
Looking at the twelve months 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 57.0%. The network as a whole sat at 79.5% reliability across all hours. During peak hours*, reliability was slightly higher at 82.7%. The Tube averaged 75.4% on average, behind the Overground at 87.5%.
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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 (82.5%), worst: Sat (67.3%).