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%).
Over the seven days to , the London Underground and Overground network averaged 86.5% reliability across all hours - generally healthy. The Waterloo & City line and the Tram stood out with the best reliability, though the Piccadilly line and the Windrush line faced the most disruption. During peak hours*, reliability was slightly higher at 89.7%.
Across the Tube network specifically, reliability sat at 86.3%, while the Overground lines came in at 84.5% - a close match between the two. The Central line notably improved, averaging 90.8% over the past week compared to 64.1% over the previous month. The Windrush line saw a notable dip, averaging 63.9% over the past week compared to 81.4% over the previous month.
Over the 30 days from to , the network came in at 80.1% overall - fairly reasonable. The Liberty line led the way at 100.0%, with the Piccadilly line the most delayed at 54.8%. During peak hours*, the Tube and Overground worked out 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 99.8%, while the Piccadilly line has been the most delayed at 61.0%. The network as a whole worked out at 80.1% reliability across all hours. During peak hours*, reliability was slightly higher at 83.6%. The Tube came in at 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 (85.2%), worst: Sat (69.2%).