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Showing United only (incl. its regional partners)All airlines ×
1,514 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 93% depart on time. After 4 pm it’s 3 in 4.

Best time to leave 8–9 am 93% arrive on time from IAD
Best single flight UA 641 IAD 08:35 → BOS 10:20 · 92% on time Avoid UA 688 IAD 17:25 → BOS 19:14 · 63% 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 641 IAD 08:35 BOS 10:20 92%
UA 755 IAD 22:10 BOS 23:59 81%
UA 688 IAD 17:25 BOS 19:14 63%

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 641 IAD 08:35 BOS 10:20 1h 45m 344 92% 1.5% 58 min
UA 3552flown by Republic IAD 10:00 BOS 11:52 1h 52m 27 85% 3.7% 50 min
UA 1392 IAD 12:55 BOS 14:40 1h 45m 149 82% 1.3% 72 min
UA 3615flown by Republic IAD 15:30 BOS 17:24 1h 54m 27 65% 25.9% 71 min
UA 688 IAD 17:25 BOS 19:14 1h 49m 362 63% 3.3% 79 min
UA 755 IAD 22:10 BOS 23:59 1h 49m 323 81% 2.2% 66 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 BOS 1h 40m 78% 2.5% 1,514 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