Direct flights from Houston (IAH) to Louisville (SDF): 7 nonstop departures observed each week across 1 airline. The median arrival is 18 minutes late. No cancellations were recorded across the 4 tracked flights. The nonstop covers 1,268 km, an estimated 2 hours 8 minutes in the air. Measured by Pro Flight Search from live flight boards at Houston and Louisville. Updated 20 October 2026 at 01:37 UTC.
Left IAH at 10:22, 35 min after its 09:47 slot.
Landing estimate from 150,816 tracked flights of 2 to 4 hours that left 30 to 59 min late. The SDF board has not posted a landing time yet. How planes make up time
Track UA3990 →Checked IAH board 20:37 · SDF board 15:03
route health from live IAH and SDF delay boards
Median arrival delay is +18 min. 0 of 4 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Actual board outcomes rather than schedules, paired departure and arrival per flight and day.
Current conditions put the pressure at SDF: 35% 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
Pro Flight Search records official board updates for nonstop IAH to SDF 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
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Pro Flight Search — Houston (IAH) to Louisville (SDF) route reliability, measured from operated flights on official airport boards.
https://proflightsearch.com/search-flights/IAH-SDF
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.
Operators schedule morning departures around 09:47 and evening departures around 18:45 from IAH. Earlier flights typically land before destination-airport delays accumulate later in the day; check the SDF delay card to confirm conditions when you'd arrive.
Great-circle distance is 1,268 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 120–139 min gate-to-gate on this route.
United Airlines runs the route with about 21 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.
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