About 1 in 5 UA 4320 flights from Houston arrived 15+ minutes late, diverted or cancelled over the past year (19%); 0.7% were cancelled. The typical flight landed 9 minutes early.
UA 4320: IAH → JAN
Scheduled to leave Houston at 8:30 p.m. local time, operated by CommutAir as C5 4320. Over the past year it arrived on time 81% of the time (295 flights), in line with other UA flights on the route at that hour (80%). Last seen in the data Aug 31, 2026.
Usually United Airlines's last flight of the day from Houston to Jackson (100% of days). United Airlines's last IAH–JAN flight was cancelled 0.5% of the time, against 1.1% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 9:57 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 46 | 83% |
| Tuesday | 39 | 85% |
| Wednesday | 46 | 85% |
| Thursday | 43 | 86% |
| Friday | 44 | 75% |
| Saturday | 33 | 79% |
| Sunday | 44 | 75% |
Why it was late
All flights IAH → JAN · Connecting off UA 4320? Check the risk
Questions
How often is UA 4320 from IAH to JAN late?
United Airlines 4320 from Houston, TX to Jackson/Vicksburg, MS arrived 15 or more minutes late, was diverted or was cancelled on 19% of 295 scheduled flights between September 2025 and August 2026. 0.7% 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.