1,077 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: airlines and hours on this route all land within a few points of 87% on time.

Best time to leave 8–9 am 91% 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).

IAD

% 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

Las Vegas flights leaving IAD 9–10 am: 1Close ×


F9 4277	IAD 09:50	LAS 11:45	4h 58m	99	66%	0.0%	60 min

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.


United	978	89%	0.5%	77 min
Frontier	99	–	0.0%	60 min

Dimmed: fewer than 150 flights in the year, too few to rank.

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 4 flights on this route →

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
Frontier	IAD	LAS	4h 58m	66%	0.0%	99	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