About 1 in 8 UA 1799 flights from Houston arrived 15+ minutes late, diverted or cancelled over the past year (12%); 0.5% were cancelled. The typical flight landed 12 minutes early.
UA 1799: IAH → LAS
Scheduled to leave Houston at 9:45 a.m. local time. Over the past year it arrived on time 88% of the time (365 flights), in line with other UA flights on the route at that hour (91%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 87% |
| Tuesday | 52 | 83% |
| Wednesday | 52 | 92% |
| Thursday | 52 | 88% |
| Friday | 52 | 87% |
| Saturday | 52 | 88% |
| Sunday | 52 | 90% |
Why it was late
All flights IAH → LAS · Connecting off UA 1799? Check the risk
UA 1799: LAS → SFO
Scheduled to leave Las Vegas at 1:34 p.m. local time. Over the past year it arrived on time 52% of the time (288 flights), worse than other UA flights on the route at that hour (59%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 43 | 51% |
| Tuesday | 39 | 54% |
| Wednesday | 39 | 54% |
| Thursday | 41 | 39% |
| Friday | 42 | 52% |
| Saturday | 42 | 60% |
| Sunday | 42 | 57% |
Why it was late
All flights LAS → SFO · Connecting off UA 1799? Check the risk
Questions
How often is UA 1799 from IAH to LAS late?
United Airlines 1799 from Houston, TX to Las Vegas, NV arrived 15 or more minutes late, was diverted or was cancelled on 12% of 365 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.
How often is UA 1799 from LAS to SFO late?
United Airlines 1799 from Las Vegas, NV to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 48% of 288 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.