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 80.7% reliability across all hours - broadly fair. The Waterloo & City line and the Liberty line stood out with the best reliability, though the Metropolitan line and the DLR faced the most disruption. During peak hours*, reliability was slightly higher at 84.9%.
Across the Tube network specifically, reliability worked out at 82.0%, while the Overground lines averaged 82.7% - a close match between the two. The District line notably improved, averaging 86.0% over the past week compared to 59.9% over the previous month. The Lioness line saw a notable dip, averaging 49.0% over the past week compared to 82.9% over the previous month.
Taking the 30-day period ending , the network averaged 78.5% overall - fairly reasonable. The Liberty line led the way at 100.0%, with the District line the most delayed at 59.9%. During peak hours*, the Tube and Overground sat at 80.3%, 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 99.8%, while the Piccadilly line has been the most delayed at 61.4%. The network as a whole sat at 79.8% reliability across all hours. During peak hours*, reliability was slightly higher at 83.3%. The Tube averaged 76.8% on average, behind the Overground at 88.2%.
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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: Mon (84.7%), worst: Sun (68.3%).