About 1 in 5 UA 1859 flights from Houston arrived 15+ minutes late, diverted or cancelled over the past year (18%); 1.2% were cancelled. The typical flight landed 5 minutes early.
UA 1859: IAH → AUS
Scheduled to leave Houston at 12:05 p.m. local time. Over the past year it arrived on time 82% of the time (327 flights), in line with other UA flights on the route at that hour (81%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 50 | 80% |
| Tuesday | 47 | 91% |
| Wednesday | 50 | 88% |
| Thursday | 48 | 83% |
| Friday | 48 | 75% |
| Saturday | 38 | 84% |
| Sunday | 46 | 70% |
Why it was late
All flights IAH → AUS · Connecting off UA 1859? Check the risk
UA 1859: PIT → IAH
Scheduled to leave Pittsburgh at 6:15 a.m. local time. Over the past year it arrived on time 94% of the time (155 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 | 22 | 95% |
| Tuesday | 22 | 86% |
| Wednesday | 22 | 95% |
| Thursday | 22 | 95% |
| Friday | 22 | 95% |
| Saturday | 22 | 95% |
| Sunday | 23 | 91% |
Why it was late
All flights PIT → IAH · Connecting off UA 1859? Check the risk
Questions
How often is UA 1859 from IAH to AUS late?
United Airlines 1859 from Houston, TX to Austin, TX arrived 15 or more minutes late, was diverted or was cancelled on 18% of 327 scheduled flights between September 2025 and August 2026. 1.2% were cancelled.
How often is UA 1859 from PIT to IAH late?
United Airlines 1859 from Pittsburgh, PA to Houston, TX arrived 15 or more minutes late, was diverted or was cancelled on 6% of 155 scheduled flights between September 2025 and August 2026. 0.0% 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.