American AirlinesAA
live
Direct flights from Louisville (SDF) to Boston (BOS): 14 nonstop departures observed each week across 2 airlines. 38% of the last 8 operated flights arrived within 15 minutes of schedule. The median arrival is 46 minutes late. No cancellations were recorded across the 8 tracked flights. The nonstop covers 1,332 km, an estimated 2 hours 12 minutes in the air. Measured by Pro Flight Search from live flight boards at Louisville and Boston. Updated 6 September 2026 at 13:26 UTC.
SDF
Louisville
busy · +15
BOS
Boston
smooth · +0
1,332 km · ~2h 12m est.
Runs rough · 2 airlines · 14x weekly · nonstop
38% on time
of the last 8 operated SDF → BOS flights arrived within 15 minutes
Median arrival delay is +46 min. 0 of 8 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+46 minacross the last 8 operated legs
Flight time~2h 12mestimated from route distance
Weekly departures14x2 direct airlines on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
American AirlinesDelta Air Lines
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 daysDelta Air LinesDL
Flights DL5615 varies daily
History
operated legs · board outcomes09-03MQ4110departed+57
Actual 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 BOS: 39% odds of a 15+ minute delay and around +8 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 Louisville to Boston route actually runs
Pro Flight Search records official board updates for nonstop SDF to BOS 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 — Louisville (SDF) to Boston (BOS) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/SDF-BOS
SDF to BOS questions
Is SDF–BOS running on time right now?
Smooth skies ahead. The departure side at SDF is the weaker end, route health score 90/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from SDF to BOS?
Great-circle distance is 1,332 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 124–144 min gate-to-gate on this route.
How often does SDF–BOS fly?
2 carriers operate this route, around 14 flights a week between them. Compare carrier days and times in the airline list above.
What does the route health score measure?
A blend of departure-side delay at SDF and arrival-side delay at BOS, 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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