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

No clear winner: United’s GSP → IAD flights land within a few points of 86% on time whatever the hour.

Best time to leave 10–11 am 92% arrive on time from GSP
Best single flight UA 4958 GSP 10:30 → IAD 12:08 · 92% on time Avoid UA 4959 GSP 14:55 → IAD 16:30 · 80% 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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GSP
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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 4958flown by CommuteAir GSP 10:30 IAD 12:08 92%
UA 4959flown by CommuteAir GSP 14:55 IAD 16:30 80%

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 4958flown by CommuteAir GSP 10:30 IAD 12:08 1h 38m 318 92% 1.3% 71 min
UA 4959flown by CommuteAir GSP 14:55 IAD 16:30 1h 35m 308 80% 1.9% 116 min
UA 4313flown by CommuteAir GSP 19:40 IAD 21:19 1h 39m 115 83% 3.5% 189 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 GSP IAD 1h 35m 86% 1.7% 864 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