United Airlines
Is UAL4521 delayed?
Service date: · Scheduled departure date (UTC)
Last reported
Cancelled
This update may be out of date. Check with your airline.
Update time unavailable
Departure
Fayetteville/Springdale/
XNA
Scheduled
Sep 18
Arrival
Houston
IAH
Scheduled
Sep 18
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
XNAIAH
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 9 min late
XNA → IAH
- 7 min late
XNA → IAH
- 18 min late
XNA → IAH
- 1 min late
XNA → IAH
- 16 min late
XNA → IAH
Flight history and details
Aug 23, 2026 — Sep 22, 2026
- Observed arrivals
- 16
- Arrivals over 15 minutes late
- 3
- Observed cancellations
- 1
- Observed occurrences
- 17
Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Sep 21, 2026Arrived | Fayetteville/Springdale/ | Houston | 9 | |
| Sep 20, 2026Arrived | Fayetteville/Springdale/ | Houston | 7 | |
| Sep 19, 2026Arrived | Fayetteville/Springdale/ | Houston | 18 | |
| Sep 18, 2026Cancelled | Fayetteville/Springdale/ | Houston | Not available | Not available |
| Sep 17, 2026Arrived | Fayetteville/Springdale/ | Houston | 1 | |
| Sep 16, 2026Arrived | Fayetteville/Springdale/ | Houston | 16 | |
| Sep 14, 2026Arrived | Fayetteville/Springdale/ | Houston | -13 | |
| Sep 13, 2026Arrived | Fayetteville/Springdale/ | Houston | -12 | |
| Sep 12, 2026Arrived | Fayetteville/Springdale/ | Houston | -16 | |
| Sep 11, 2026Arrived | Fayetteville/Springdale/ | Houston | -14 | |
| Sep 10, 2026Arrived | Fayetteville/Springdale/ | Houston | -9 | |
| Sep 9, 2026Arrived | Fayetteville/Springdale/ | Houston | -13 | |
| Sep 8, 2026Arrived | Fayetteville/Springdale/ | Houston | -9 | |
| Sep 7, 2026Arrived | Fayetteville/Springdale/ | Houston | 2 | |
| Sep 6, 2026Arrived | Fayetteville/Springdale/ | Houston | -2 | |
| Sep 5, 2026Arrived | Fayetteville/Springdale/ | Houston | 80 | |
| Sep 4, 2026Arrived | Fayetteville/Springdale/ | Houston | 4 |