About 1 in 17 UA 2666 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (6%); 0.0% were cancelled. The typical flight landed 14 minutes early.
UA 2666: DEN → SNA
Scheduled to leave Denver at 7:40 a.m. local time. Over the past year it arrived on time 94% of the time (340 flights), in line with other UA flights on the route at that hour (93%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 49 | 90% |
| Tuesday | 48 | 94% |
| Wednesday | 48 | 90% |
| Thursday | 49 | 96% |
| Friday | 48 | 96% |
| Saturday | 49 | 96% |
| Sunday | 49 | 98% |
Why it was late
All flights DEN → SNA · Connecting off UA 2666? Check the risk
UA 2666: ORD → DEN
Scheduled to leave Chicago at 5:00 a.m. local time. Over the past year it arrived on time 95% of the time (158 flights), in line with other UA flights on the route at that hour (95%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 23 | 91% |
| Tuesday | 22 | 95% |
| Wednesday | 22 | 100% |
| Thursday | 23 | 96% |
| Friday | 23 | 96% |
| Saturday | 23 | 96% |
| Sunday | 22 | 91% |
Why it was late
All flights ORD → DEN · Connecting off UA 2666? Check the risk
Questions
How often is UA 2666 from DEN to SNA late?
United Airlines 2666 from Denver, CO to Santa Ana, CA arrived 15 or more minutes late, was diverted or was cancelled on 6% of 340 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
How often is UA 2666 from ORD to DEN late?
United Airlines 2666 from Chicago, IL to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 5% of 158 scheduled flights between September 2025 and August 2026. 1.3% 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.