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Showing United only (incl. its regional partners)All airlines ×
1,071 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: United’s IAH → SDF flights land within a few points of 84% on time whatever the hour.

Best time to leave 10–11 am 87% arrive on time from IAH
Best single flight UA 3990 IAH 08:30 → SDF 11:54 · 86% on time Avoid UA 4050 IAH 16:35 → SDF 20:01 · 84% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

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% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.
UA 3990flown by Mesa IAH 08:30 SDF 11:54 86%
UA 4052flown by Mesa IAH 18:49 SDF 22:15 84%
UA 4050flown by Mesa IAH 16:35 SDF 20:01 84%

All 3 United flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
UA 3990flown by Mesa IAH 08:30 SDF 11:54 2h 24m 263 86% 0.4% 58 min
UA 4050flown by Mesa IAH 16:35 SDF 20:01 2h 26m 221 84% 2.7% 74 min
UA 4052flown by Mesa IAH 18:49 SDF 22:15 2h 26m 201 84% 0.5% 91 min

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.
United IAH SDF 2h 25m 84% 1.0% 1,071 Flying now
Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON