About 1 in 6 UA 1803 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (16%); 0.3% were cancelled. The typical flight landed 10 minutes early.
UA 1803: ORD → DEN
Scheduled to leave Chicago at 10:40 a.m. local time. Over the past year it arrived on time 84% of the time (297 flights), in line with other UA flights on the route at that hour (85%). Last seen in the data Jun 24, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 43 | 84% |
| Tuesday | 43 | 86% |
| Wednesday | 43 | 84% |
| Thursday | 42 | 86% |
| Friday | 42 | 86% |
| Saturday | 42 | 81% |
| Sunday | 42 | 83% |
Why it was late
All flights ORD → DEN · Connecting off UA 1803? Check the risk
UA 1803: PIT → ORD
Scheduled to leave Pittsburgh at 7:00 a.m. local time. Over the past year it arrived on time 86% of the time (214 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
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 30 | 87% |
| Tuesday | 31 | 87% |
| Wednesday | 29 | 86% |
| Thursday | 31 | 87% |
| Friday | 31 | 90% |
| Saturday | 31 | 81% |
| Sunday | 31 | 87% |
Why it was late
All flights PIT → ORD · Connecting off UA 1803? Check the risk
Questions
How often is UA 1803 from ORD to DEN late?
United Airlines 1803 from Chicago, IL to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 16% of 297 scheduled flights between September 2025 and August 2026. 0.3% were cancelled.
How often is UA 1803 from PIT to ORD late?
United Airlines 1803 from Pittsburgh, PA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 14% of 214 scheduled flights between September 2025 and August 2026. 1.4% 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.