About 1 in 3 UA 4665 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (31%); 0.6% were cancelled. The typical flight landed 1 minutes early.
UA 4665: DEN → BIS
Scheduled to leave Denver at 5:35 p.m. local time, operated by SkyWest as OO 4665. Over the past year it arrived on time 69% of the time (347 flights), in line with other UA flights on the route at that hour (68%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 63% |
| Tuesday | 49 | 76% |
| Wednesday | 49 | 84% |
| Thursday | 49 | 63% |
| Friday | 50 | 74% |
| Saturday | 49 | 61% |
| Sunday | 50 | 64% |
Why it was late
All flights DEN → BIS · Connecting off UA 4665? Check the risk
Questions
How often is UA 4665 from DEN to BIS late?
United Airlines 4665 from Denver, CO to Bismarck/Mandan, ND arrived 15 or more minutes late, was diverted or was cancelled on 31% of 347 scheduled flights between September 2025 and August 2026. 0.6% 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.