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Showing United only (incl. its regional partners)All airlines ×
1,266 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 86% depart on time. After 4 pm it’s 3 in 4.

Best time to leave 1–2 pm 86% arrive on time from IAD
Best single flight UA 4257 IAD 09:00 → TYS 10:42 · 80% on time Avoid UA 4914 IAD 18:46 → TYS 20:34 · 75% 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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IAD
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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 4257flown by CommuteAir IAD 09:00 TYS 10:42 80%
UA 4304flown by CommuteAir IAD 22:10 TYS 23:54 76%
UA 4914flown by CommuteAir IAD 18:46 TYS 20:34 75%

All 4 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 4257flown by CommuteAir IAD 09:00 TYS 10:42 1h 42m 335 80% 0.9% 113 min
UA 6110flown by Mesa IAD 12:50 TYS 14:27 1h 37m 72 82% 0.0% 111 min
UA 4914flown by CommuteAir IAD 18:46 TYS 20:34 1h 48m 365 75% 2.2% 169 min
UA 4304flown by CommuteAir IAD 22:10 TYS 23:54 1h 44m 180 76% 0.6% 94 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 IAD TYS 1h 45m 79% 1.3% 1,266 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