ON TIMEBOARD
United Airlines / DEN → ORD

UA 2329 on time

United Airlines 2329: Denver to Chicago at 9:35 a.m.; San Luis Obispo to Denver at 5:00 a.m. (past 12 months). Figures below the title are for DEN → ORD, its busiest leg

On time
83%
365 flights · likely 79–86%
Cancelled
0.5%
of scheduled flights
Typical arrival
−1 min
median vs schedule
When late
+82 min
average delay
Similar flights
83%
UA, same route & hour

About 1 in 6 UA 2329 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (17%); 0.5% were cancelled. The typical flight landed 1 minutes early.

UA 2329: DEN → ORD

Scheduled to leave Denver at 9:35 a.m. local time. Over the past year it arrived on time 83% of the time (365 flights), in line with other UA flights on the route at that hour (83%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 93% on time (30 flights)93SepOct 2025: 94% on time (31 flights)94OctNov 2025: 80% on time (30 flights)80NovDec 2025: 87% on time (31 flights)87DecJan 2026: 84% on time (31 flights)84JanFeb 2026: 89% on time (28 flights)89FebMar 2026: 77% on time (31 flights)77MarApr 2026: 60% on time (30 flights)60AprMay 2026: 81% on time (31 flights)81MayJun 2026: 87% on time (30 flights)87JunJul 2026: 84% on time (31 flights)84JulAug 2026: 77% on time (31 flights)77Aug

By day of week

DayFlightsOn time
Monday5387%
Tuesday5281%
Wednesday5281%
Thursday5281%
Friday5281%
Saturday5285%
Sunday5285%

Why it was late

Air traffic & airport (NAS) 38%Airline (crew, maintenance, ops) 29%Late inbound plane 22%Severe weather 11%

All flights DEN → ORD · Connecting off UA 2329? Check the risk

UA 2329: SBP → DEN

Scheduled to leave San Luis Obispo at 5:00 a.m. local time. Over the past year it arrived on time 88% of the time (237 flights), in line with other UA flights on the route at that hour (86%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jan 2026: 85% on time (26 flights)85JanFeb 2026: 93% on time (27 flights)93FebMar 2026: 81% on time (31 flights)81MarApr 2026: 83% on time (30 flights)83AprMay 2026: 97% on time (31 flights)97MayJun 2026: 87% on time (30 flights)87JunJul 2026: 87% on time (31 flights)87JulAug 2026: 94% on time (31 flights)94Aug

By day of week

DayFlightsOn time
Monday3488%
Tuesday3494%
Wednesday3391%
Thursday3491%
Friday3485%
Saturday3482%
Sunday3485%

Why it was late

Airline (crew, maintenance, ops) 59%Late inbound plane 34%Air traffic & airport (NAS) 5%Severe weather 2%

All flights SBP → DEN · Connecting off UA 2329? Check the risk

Questions

How often is UA 2329 from DEN to ORD late?

United Airlines 2329 from Denver, CO to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 17% of 365 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.

How often is UA 2329 from SBP to DEN late?

United Airlines 2329 from San Luis Obispo, CA to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 12% of 237 scheduled flights between September 2025 and August 2026. 0.8% 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.