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 75.2% reliability across all hours - broadly fair. The Liberty line and the Weaver line stood out with the best reliability, though the Elizabeth line and the Central line faced the most disruption. During peak hours*, reliability was broadly similar at 75.3%.
Across the Tube network specifically, reliability averaged 68.8%, while the Overground lines sat at 90.8% - with the Overground ahead of the Underground. The Tram notably improved, averaging 84.8% over the past week compared to 40.5% over the previous month. The Elizabeth line saw a notable dip, averaging 20.8% over the past week compared to 68.8% over the previous month.
Looking at the 30-day window from to , the network sat at 72.2% overall - a bit mixed. The Liberty line led the way at 99.9%, with the Tram the most delayed at 40.5%. During peak hours*, the Tube and Overground came in at 74.3%, 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 57.5%. The network as a whole came in at 79.1% reliability across all hours. During peak hours*, reliability was slightly higher at 82.2%. The Tube sat at 75.7% on average, behind the Overground at 86.8%.
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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 (81.3%), worst: Sat (65.1%).