About 1 in 9 UA 4878 flights from Mobile arrived 15+ minutes late, diverted or cancelled over the past year (11%); 0.3% were cancelled. The typical flight landed 17 minutes early.
UA 4878: MOB → IAH
Scheduled to leave Mobile at 11:00 a.m. local time, operated by CommutAir as C5 4878. Over the past year it arrived on time 89% of the time (359 flights), in line with other UA flights on the route at that hour (88%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 89% |
| Tuesday | 51 | 88% |
| Wednesday | 52 | 92% |
| Thursday | 52 | 87% |
| Friday | 52 | 88% |
| Saturday | 47 | 89% |
| Sunday | 52 | 90% |
Why it was late
All flights MOB → IAH · Connecting off UA 4878? Check the risk
Questions
How often is UA 4878 from MOB to IAH late?
United Airlines 4878 from Mobile, AL to Houston, TX arrived 15 or more minutes late, was diverted or was cancelled on 11% of 359 scheduled flights between September 2025 and August 2026. 0.3% 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.