About 1 in 6 UA 1535 flights from Washington arrived 15+ minutes late, diverted or cancelled over the past year (16%); 0.6% were cancelled. The typical flight landed 12 minutes early.
UA 1535: IAD → IAH
Scheduled to leave Washington at 12:50 p.m. local time. Over the past year it arrived on time 84% of the time (320 flights), in line with other UA flights on the route at that hour (86%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 46 | 89% |
| Tuesday | 45 | 89% |
| Wednesday | 45 | 80% |
| Thursday | 46 | 80% |
| Friday | 46 | 76% |
| Saturday | 46 | 85% |
| Sunday | 46 | 89% |
Why it was late
All flights IAD → IAH · Connecting off UA 1535? Check the risk
UA 1535: IAH → DFW
Scheduled to leave Houston at 6:05 p.m. local time. Over the past year it arrived on time 68% of the time (217 flights), in line with other UA flights on the route at that hour (68%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 32 | 72% |
| Tuesday | 30 | 63% |
| Wednesday | 29 | 69% |
| Thursday | 32 | 72% |
| Friday | 31 | 81% |
| Saturday | 31 | 65% |
| Sunday | 32 | 53% |
Why it was late
All flights IAH → DFW · Connecting off UA 1535? Check the risk
UA 1535: RDU → IAD
Scheduled to leave Raleigh at 10:32 a.m. local time. Over the past year it arrived on time 89% of the time (180 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 | 26 | 92% |
| Tuesday | 25 | 92% |
| Wednesday | 25 | 88% |
| Thursday | 26 | 88% |
| Friday | 26 | 88% |
| Saturday | 26 | 92% |
| Sunday | 26 | 85% |
Why it was late
All flights RDU → IAD · Connecting off UA 1535? Check the risk
Questions
How often is UA 1535 from IAD to IAH late?
United Airlines 1535 from Washington, DC to Houston, TX arrived 15 or more minutes late, was diverted or was cancelled on 16% of 320 scheduled flights between September 2025 and August 2026. 0.6% were cancelled.
How often is UA 1535 from IAH to DFW late?
United Airlines 1535 from Houston, TX to Dallas/Fort Worth, TX arrived 15 or more minutes late, was diverted or was cancelled on 32% of 217 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.
How often is UA 1535 from RDU to IAD late?
United Airlines 1535 from Raleigh/Durham, NC to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 11% of 180 scheduled flights between September 2025 and August 2026. 0.6% 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.