United Airlines
Is UA3924 delayed?
Service date: · Scheduled departure date (UTC)
Arrived
132 min late
Official source · Updated
Departure
Sacramento
SMF
Actual
Scheduled 21:41
Sep 18
Arrival
San Francisco
SFO
Actual
Scheduled 15:16
Sep 18
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
SMFSFO
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 8 min late
IAH → CLE
- 132 min late
SMF → SFO
- 6 min late
EWR → ORD
- 10 min early
PHL → ORD
- 1 min late
ORD → MSP
Flight history and details
Aug 23, 2026 — Sep 22, 2026
- Observed arrivals
- 6
- Arrivals over 15 minutes late
- 2
- Observed cancellations
- 1
- Observed occurrences
- 8
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 | Houston | Cleveland | 8 | |
| Sep 18, 2026Arrived | Sacramento | San Francisco | 132 | |
| Sep 16, 2026Cancelled | Chicago | Denver | Not available | Not available |
| Sep 14, 2026Arrived | Newark | Chicago | 6 | |
| Sep 12, 2026Arrived | Philadelphia | Chicago | -10 | |
| Sep 7, 2026Arrived | Chicago | Minneapolis | 1 | |
| Sep 5, 2026Arrived | Frankfurt-am-Main | Denver | 64 |