RyanairFR100% on time
Flights FR1731 varies Mo Tu We Th Fr Sa · FR2691 varies Mo Th Sa Su · FR8516 17:15 Fr Su · FR9962 varies Mo Tu We Fr
live
Direct flights from Sofia (SOF) to London (STN): 7 nonstop departures observed each week across 1 airline. 100% of the last 8 operated flights arrived within 15 minutes of schedule. The median arrival is 4 minutes early. No cancellations were recorded across the 8 tracked flights. The nonstop covers 2,012 km, an estimated 3 hours 5 minutes in the air. Measured by Pro Flight Search from live flight boards at Sofia and London. Updated 8 September 2026 at 05:09 UTC.
SOF
Sofia
smooth · +0
STN
London
smooth · +8
2,012 km · ~3h 05m est.
Runs reliable · 1 airline · 7x weekly · nonstop
100% on time
of the last 8 operated SOF → STN flights arrived within 15 minutes
Median arrival delay is −4 min. 0 of 8 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−4 minacross the last 8 operated legs
Flight time~3h 05mestimated from route distance
Weekly departures7x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Ryanair
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 boardsWeather lens
Current conditions put the pressure at STN: 45% odds of a 15+ minute delay and around +17 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Sofia to London route actually runs
Pro Flight Search records official board updates for nonstop SOF to STN 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 — Sofia (SOF) to London (STN) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/SOF-STN
SOF to STN questions
Is SOF–STN running on time right now?
Smooth skies ahead. The arrival side at STN is the weaker end, route health score 94/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from SOF to STN?
Great-circle distance is 2,012 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 172–202 min gate-to-gate on this route.
How often does SOF–STN fly?
Ryanair runs the route with about 16 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 SOF and arrival-side delay at STN, 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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