About 1 in 4 UA 2456 flights from Houston arrived 15+ minutes late, diverted or cancelled over the past year (26%); 0.4% were cancelled. The typical flight landed 1 minutes early.
UA 2456: IAH → SEA
Scheduled to leave Houston at 7:57 p.m. local time. Over the past year it arrived on time 74% of the time (280 flights), in line with other UA flights on the route at that hour (76%). Last seen in the data Aug 10, 2026.
Usually United Airlines's last flight of the day from Houston to Seattle (93% of days). United Airlines's last IAH–SEA flight was cancelled 0.3% of the time, against 0.0% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 8:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 41 | 71% |
| Tuesday | 34 | 88% |
| Wednesday | 33 | 76% |
| Thursday | 44 | 77% |
| Friday | 44 | 70% |
| Saturday | 39 | 69% |
| Sunday | 45 | 69% |
Why it was late
All flights IAH → SEA · Connecting off UA 2456? Check the risk
UA 2456: MCO → IAH
Scheduled to leave Orlando at 3:15 p.m. local time. Over the past year it arrived on time 86% of the time (187 flights), better than other UA flights on the route at that hour (83%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 30 | 93% |
| Tuesday | 22 | 95% |
| Wednesday | 22 | 95% |
| Thursday | 29 | 76% |
| Friday | 29 | 76% |
| Saturday | 25 | 88% |
| Sunday | 30 | 83% |
Why it was late
All flights MCO → IAH · Connecting off UA 2456? Check the risk
Questions
How often is UA 2456 from IAH to SEA late?
United Airlines 2456 from Houston, TX to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 26% of 280 scheduled flights between September 2025 and August 2026. 0.4% were cancelled.
How often is UA 2456 from MCO to IAH late?
United Airlines 2456 from Orlando, FL to Houston, TX arrived 15 or more minutes late, was diverted or was cancelled on 14% of 187 scheduled flights between September 2025 and August 2026. 0.5% 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.