Is UA552 delayed?
Service date: · Scheduled departure date (America/Los_Angeles)
Arrived
28 min early
Official source · Updated
Departure
San Francisco
SFO
Actual
Scheduled 21:42
Sep 14
Arrival
Ontario
ONT
Actual
Scheduled 05:48
Sep 15
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
SFOONT
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 16 min early
SMF → IAH
- 28 min early
SFO → ONT
- 25 min early
SMF → IAH
- 8 min early
IAH → SBN
- 25 min early
SMF → IAH
Flight history and details
Aug 18, 2026 — Sep 17, 2026
- Observed arrivals
- 10
- Arrivals over 15 minutes late
- 0
- Observed cancellations
- 0
- Observed occurrences
- 19
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 16, 2026Arrived | Sacramento | Houston | -16 | |
| Sep 14, 2026Arrived | San Francisco | Ontario | -28 | |
| Sep 12, 2026Arrived | Sacramento | Houston | -25 | |
| Sep 11, 2026Arrived | Houston | South Bend | -8 | |
| Sep 9, 2026Arrived | Sacramento | Houston | -25 | |
| Sep 8, 2026Arrived | Sacramento | Houston | -11 | |
| Sep 7, 2026Arrived | San Francisco | Ontario | -7 | |
| Sep 5, 2026Arrived | Raleigh/Durham | San Francisco | -20 | |
| Sep 4, 2026Arrived | San Francisco | Ontario | -23 | |
| Sep 3, 2026Arrived | San Francisco | Ontario | -2 |