Flight Reliability
UA 4318 · United Airlines
JAN → Houston (JAN–IAH)97% of its flights flew this route. The rest (GPT–IAH, IAH–AMA) are included in these numbers.
88
Pretty Reliable
WanderNerd Reliability Score
- 81%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 0.3%
- Cancelled
- 8 min early
- Median arrival delay
Based on 342 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 4318 arrived on time 90% of the time on Mondays and just 71% on Sundays. That gap is worth planning around.
It basically never cancels.
Out of 342 scheduled flights, only 0.3% were cancelled.
Recent months have been rougher.
UA 4318 arrived on time 74% of the time over the last three months in the data, compared with 85% in the three months before that.
The breakdown
- Mon90%(52 flights)
- Tue77%(48 flights)
- Wed89%(47 flights)
- Thu83%(52 flights)
- Fri75%(47 flights)
- Sat81%(47 flights)
- Sun71%(48 flights)
- 6–9 AM80%(330 flights)
- 9 AM–12 PM—(9 flights)
- 3–6 PM—(2 flights)
68%
May
Jun 83% → May 68% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 90% | 31 |
| August 2025 | 81% | 31 |
| September 2025 | 96% | 26 |
| October 2025 | 92% | 13 |
| November 2025 | 60% | 30 |
| December 2025 | 84% | 31 |
| January 2026 | 83% | 30 |
| February 2026 | 89% | 27 |
| March 2026 | 77% | 31 |
| April 2026 | 77% | 30 |
| May 2026 | 68% | 31 |
- Departures on time
- 91%
- Diverted
- 0%
- Flights flown
- 341
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 342 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.