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%).
For the week to , the London Underground and Overground network worked out at 87.7% reliability across all hours - fairly good. The Waterloo & City line led the way, closely followed by the Tram, with the Piccadilly line and the Windrush line experiencing the most delays. During peak hours*, reliability was slightly higher at 92.1%.
Across the Tube network specifically, reliability averaged 86.3%, while the Overground lines sat at 88.3% - with the Overground ahead of the Underground. The Metropolitan line notably improved, averaging 91.5% over the past week compared to 65.9% over the previous month. The Windrush line saw a notable dip, averaging 72.7% over the past week compared to 81.4% over the previous month.
Looking at the 30-day window from to , the network sat at 80.2% overall - broadly fair. The Liberty line led the way at 100.0%, with the Piccadilly line the most delayed at 56.4%. During peak hours*, the Tube and Overground came in at 82.5%, edging slightly above 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 61.1%. The network as a whole came in at 80.1% reliability across all hours. During peak hours*, reliability was slightly higher at 83.6%. The Tube sat at 76.8% on average, behind the Overground at 88.3%.
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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%).