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Showing United only (incl. its regional partners)All airlines ×
1,151 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: United’s BUF → IAD flights land within a few points of 85% on time whatever the hour.

Best time to leave 10–11 am 88% arrive on time from BUF
Best single flight UA 4270 BUF 19:52 → IAD 21:15 · 82% on time Avoid UA 4291 BUF 15:00 → IAD 16:23 · 79% 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 4270flown by CommuteAir BUF 19:52 IAD 21:15 82%
UA 4291flown by CommuteAir BUF 15:00 IAD 16:23 79%

All 6 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 4534flown by GoJet BUF 06:09 IAD 07:27 1h 18m 15 93% 0.0% 75 min
UA 3668flown by Republic BUF 06:15 IAD 07:34 1h 19m 21 90% 4.8% 175 min
UA 4179flown by GoJet BUF 10:34 IAD 11:48 1h 14m 24 92% 0.0% 132 min
UA 3430flown by Republic BUF 10:34 IAD 11:50 1h 16m 42 88% 0.0% 89 min
UA 4291flown by CommuteAir BUF 15:00 IAD 16:23 1h 23m 274 79% 2.9% 93 min
UA 4270flown by CommuteAir BUF 19:52 IAD 21:15 1h 23m 203 82% 3.9% 107 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 BUF IAD 1h 21m 85% 2.3% 1,151 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