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 71.5% reliability across all hours - rather patchy. The Liberty line and the Lioness line stood out with the best reliability, though the Tram and the Suffragette line faced the most disruption. During peak hours*, reliability was slightly higher at 77.8%.
Across the Tube network specifically, reliability sat at 72.3%, while the Overground lines came in at 80.4% - the Overground having the better week. The Victoria line notably improved, averaging 70.9% over the past week compared to 53.4% over the previous month. The Tram saw a notable dip, averaging 4.3% over the past week compared to 44.2% over the previous month.
Over the 30 days from to , the network came in at 77.6% overall - fairly reasonable. The Liberty line led the way at 100.0%, with the Tram the most delayed at 44.2%. During peak hours*, the Tube and Overground worked out at 81.8%, 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 99.9%, while the Piccadilly line has been the most delayed at 59.2%. The network as a whole worked out at 78.9% reliability across all hours. During peak hours*, reliability was slightly higher at 82.0%. The Tube came in at 75.7% on average, behind the Overground at 86.6%.
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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 (81.7%), worst: Sat (60.1%).