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

No clear winner: United’s IAD → LAS flights land within a few points of 9 in 10 on time whatever the hour.

Best time to leave 9–10 am 96% arrive on time from IAD
Best single flight UA 1323 IAD 08:15 → LAS 10:24 · 95% on time Avoid UA 2156 IAD 13:00 → LAS 15:09 · 91% 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
93
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73
% 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 1323 IAD 08:15 LAS 10:24 95%
UA 2156 IAD 13:00 LAS 15:09 91%

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 1323 IAD 08:15 LAS 10:24 5h 09m 287 95% 1.0% 69 min
UA 2156 IAD 13:00 LAS 15:09 5h 09m 278 91% 0.4% 48 min
UA 1764 IAD 20:10 LAS 22:19 5h 09m 121 77% 0.0% 110 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 LAS 5h 09m 89% 0.5% 978 Flying now

Alternatives with one stop

All connections →
UnitedDetails → IAD 08:15 → DEN 10:10UA 792 1h 12m Denver DEN 11:22 → LAS 12:24UA 526 7h 09m 95% 78%
UnitedDetails → IAD 08:40 → IAH 10:59UA 1524 56m Houston IAH 11:55 → LAS 13:13UA 1524 7h 33m 87% 77%
UnitedDetails → IAD 12:48 → DEN 14:42UA 1587 1h 18m Denver DEN 16:00 → LAS 17:03UA 716 7h 15m 94% 74%
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