About 1 in 6 UA 678 flights from Mission arrived 15+ minutes late, diverted or cancelled over the past year (17%); 0.5% were cancelled. The typical flight landed 7 minutes early.
UA 678: MFE → IAH
Scheduled to leave Mission at 7:00 a.m. local time. Over the past year it arrived on time 83% of the time (363 flights), in line with 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 | 53 | 87% |
| Tuesday | 52 | 87% |
| Wednesday | 51 | 75% |
| Thursday | 52 | 83% |
| Friday | 51 | 90% |
| Saturday | 52 | 79% |
| Sunday | 52 | 83% |
Why it was late
All flights MFE → IAH · Connecting off UA 678? Check the risk
UA 678: IAH → LGA
Scheduled to leave Houston at 9:47 a.m. local time. Over the past year it arrived on time 76% of the time (222 flights), worse than other UA flights on the route at that hour (80%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 38 | 74% |
| Tuesday | 37 | 81% |
| Wednesday | 37 | 84% |
| Thursday | 37 | 68% |
| Friday | 37 | 78% |
| Saturday | 2 | — |
| Sunday | 34 | 74% |
Why it was late
All flights IAH → LGA · Connecting off UA 678? Check the risk
Questions
How often is UA 678 from MFE to IAH late?
United Airlines 678 from Mission/McAllen/Edinburg, TX to Houston, TX arrived 15 or more minutes late, was diverted or was cancelled on 17% of 363 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.
How often is UA 678 from IAH to LGA late?
United Airlines 678 from Houston, TX to New York, NY arrived 15 or more minutes late, was diverted or was cancelled on 24% of 222 scheduled flights between September 2025 and August 2026. 2.3% 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.