Sri Lankan AirlinesUL86% on time
Flights UL503 20:00 daily
live
Direct flights from Colombo (CMB) to London (LHR): 7 nonstop departures observed each week across 1 airline. 86% of the last 7 operated flights arrived within 15 minutes of schedule. The median arrival is 8 minutes late. No cancellations were recorded across the 7 tracked flights. The nonstop covers 8,715 km, an estimated 11 hours 40 minutes in the air. Measured by Pro Flight Search from live flight boards at Colombo and London. Updated 25 September 2026 at 11:44 UTC.
CMB
Colombo
tracking
LHR
London
smooth · +0
8,715 km · ~11h 40m est.
Runs reliable · 1 airline · 7x weekly · nonstop
86% on time
of the last 7 operated CMB → LHR flights arrived within 15 minutes
Median arrival delay is +8 min. 0 of 7 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+8 minacross the last 7 operated legs
Flight time~11h 40mestimated from route distance
Weekly departures7x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Sri Lankan Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsnext sweep in 120s
How the Colombo to London route actually runs
Pro Flight Search records official board updates for nonstop CMB to LHR flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Colombo (CMB) to London (LHR) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/CMB-LHR
CMB to LHR questions
Is CMB–LHR running on time right now?
Smooth skies ahead. Both endpoints currently score the same, route health score 100/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from CMB to LHR?
Great-circle distance is 8,715 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 645–777 min gate-to-gate on this route.
How often does CMB–LHR fly?
Sri Lankan Airlines runs the route with about 7 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at CMB and arrival-side delay at LHR, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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