ON TIMEBOARD
United Airlines / IAD → LAS

UA 1323 on time

United Airlines 1323: Washington to Las Vegas at 9:00 a.m.; Las Vegas to Denver at 1:36 p.m. (past 12 months). Figures below the title are for IAD → LAS, its busiest leg

On time
95%
277 flights · likely 91–97%
Cancelled
1.1%
of scheduled flights
Typical arrival
−17 min
median vs schedule
When late
+73 min
average delay
Similar flights
97%
UA, same route & hour

About 1 in 18 UA 1323 flights from Washington arrived 15+ minutes late, diverted or cancelled over the past year (5%); 1.1% were cancelled. The typical flight landed 17 minutes early.

UA 1323: IAD → LAS

Scheduled to leave Washington at 9:00 a.m. local time. Over the past year it arrived on time 95% of the time (277 flights), in line with other UA flights on the route at that hour (97%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Aug 2025: 87% on time (31 flights)87AugSep 2025: 97% on time (30 flights)97SepOct 2025: 100% on time (31 flights)100OctNov 2025: 97% on time (30 flights)97NovDec 2025: 84% on time (31 flights)84DecJan 2026: 81% on time (31 flights)81JanFeb 2026: 100% on time (23 flights)100FebMar 2026: 97% on time (29 flights)97MarApr 2026: 100% on time (30 flights)100AprMay 2026: 100% on time (20 flights)100MayJul 2026: too few flights (1 flights)JulAug 2026: 95% on time (21 flights)95Aug

By day of week

DayFlightsOn time
Monday4190%
Tuesday3892%
Wednesday38100%
Thursday4098%
Friday4098%
Saturday4095%
Sunday4090%

Why it was late

Airline (crew, maintenance, ops) 56%Air traffic & airport (NAS) 21%Late inbound plane 21%Severe weather 3%

All flights IAD → LAS · Connecting off UA 1323? Check the risk

UA 1323: LAS → DEN

Scheduled to leave Las Vegas at 1:36 p.m. local time. Over the past year it arrived on time 71% of the time (180 flights), worse than other UA flights on the route at that hour (74%). Last seen in the data Aug 31, 2026.

Month by month

30%65%100%Mar 2025: too few flights (2 flights)MarApr 2025: 90% on time (30 flights)90AprMay 2025: 76% on time (21 flights)76MayMar 2026: 78% on time (27 flights)78MarApr 2026: 90% on time (30 flights)90AprMay 2026: 77% on time (31 flights)77MayJun 2026: 77% on time (30 flights)77JunJul 2026: 61% on time (31 flights)61JulAug 2026: 42% on time (31 flights)42Aug

By day of week

DayFlightsOn time
Monday2658%
Tuesday2576%
Wednesday2572%
Thursday2677%
Friday2650%
Saturday2685%
Sunday2677%

Why it was late

Air traffic & airport (NAS) 54%Airline (crew, maintenance, ops) 35%Late inbound plane 11%

All flights LAS → DEN · Connecting off UA 1323? Check the risk

Questions

How often is UA 1323 from IAD to LAS late?

United Airlines 1323 from Washington, DC to Las Vegas, NV arrived 15 or more minutes late, was diverted or was cancelled on 5% of 277 scheduled flights between September 2025 and August 2026. 1.1% were cancelled.

How often is UA 1323 from LAS to DEN late?

United Airlines 1323 from Las Vegas, NV to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 29% of 180 scheduled flights between September 2025 and August 2026. 1.1% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.