United Airlines
Is UA3999 delayed?
No delay reported yet. UA3999 is scheduled to leave Colorado Springs at 12:23 on Nov 14 and reach Houston at 15:19 (as of Nov 14, 16:16 UTC).
Usually on time: arrived within 15 min of schedule on 26 of the last 28 flights.
No live update yet
Showing the published schedule until live times come in.
Update time unavailable
Departure
Colorado Springs
COS
Scheduled
Nov 14
Arrival
Houston
IAH
Scheduled
Nov 14
Times shown in airport local time
Service date: · Scheduled departure date (America/Denver)
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
- Not available
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 14 min early
Colorado Springs → Houston
- 31 min early
Colorado Springs → Houston
- 8 min early
Colorado Springs → Houston
- 9 min early
Colorado Springs → Houston
- 14 min early
Colorado Springs → Houston
Is UA3999 usually late?
Period: Oct 15, 2026 – Nov 14, 2026
On time means arriving no more than 15 minutes after the scheduled time; late means more than 15 minutes after. Cancelled and diverted flights are counted apart from arrivals. Compares scheduled and actual arrival times. Cancelled and diverted flights are left out. Some flights may be missing.
At the airports today
Houston (IAH) departures
- Left more than 15 min late
- 18 of 58
- Cancelled today
- 53
Related flights
Flight history and details
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Nov 13, 2026Arrived | Colorado Springs | Houston | -14 | |
| Nov 12, 2026Arrived | Colorado Springs | Houston | -31 | |
| Nov 11, 2026Arrived | Colorado Springs | Houston | -8 | |
| Nov 10, 2026Arrived | Colorado Springs | Houston | -9 | |
| Nov 9, 2026Arrived | Colorado Springs | Houston | -14 | |
| Nov 8, 2026Arrived | Colorado Springs | Houston | -11 | |
| Nov 7, 2026Arrived | Colorado Springs | Houston | -18 | |
| Nov 6, 2026Arrived | Colorado Springs | Houston | -19 | |
| Nov 5, 2026Arrived | Colorado Springs | Houston | 30 | |
| Nov 4, 2026Arrived | Colorado Springs | Houston | -19 | |
| Nov 3, 2026Arrived | Colorado Springs | Houston | 87 | |
| Nov 2, 2026Arrived | Colorado Springs | Houston | -16 | |
| Nov 1, 2026Arrived | Colorado Springs | Houston | -19 | |
| Oct 31, 2026Arrived | Colorado Springs | Houston | -21 | |
| Oct 30, 2026Arrived | Colorado Springs | Houston | -17 | |
| Oct 29, 2026Arrived | Colorado Springs | Houston | -24 | |
| Oct 28, 2026Arrived | Colorado Springs | Houston | -10 | |
| Oct 27, 2026Arrived | Colorado Springs | Houston | -4 | |
| Oct 26, 2026Arrived | Colorado Springs | Houston | -20 | |
| Oct 25, 2026Arrived | Colorado Springs | Houston | -11 | |
| Oct 24, 2026Arrived | Atlanta | Houston | -6 | |
| Oct 23, 2026Arrived | Atlanta | Houston | -36 | |
| Oct 22, 2026Arrived | Atlanta | Houston | -11 | |
| Oct 21, 2026Arrived | Cleveland | Dulles | 0 | |
| Oct 19, 2026Arrived | Atlanta | Houston | -25 | |
| Oct 18, 2026Arrived | Atlanta | Houston | -23 | |
| Oct 17, 2026Arrived | Atlanta | Houston | -26 | |
| Oct 16, 2026Arrived | Atlanta | Houston | -3 |