About 1 in 8 UA 4738 flights from Bismarck arrived 15+ minutes late, diverted or cancelled over the past year (12%); 0.5% were cancelled. The typical flight landed 20 minutes early.
UA 4738: BIS → DEN
Scheduled to leave Bismarck at 6:00 a.m. local time, operated by SkyWest as OO 4738. Over the past year it arrived on time 88% of the time (362 flights), in line with other UA flights on the route at that hour (90%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 83% |
| Tuesday | 52 | 88% |
| Wednesday | 51 | 96% |
| Thursday | 52 | 87% |
| Friday | 51 | 90% |
| Saturday | 52 | 85% |
| Sunday | 51 | 88% |
Why it was late
All flights BIS → DEN · Connecting off UA 4738? Check the risk
Questions
How often is UA 4738 from BIS to DEN late?
United Airlines 4738 from Bismarck/Mandan, ND to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 12% of 362 scheduled flights between September 2025 and August 2026. 0.5% 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.