UA552
UA552 (United Airlines) is a multi-stop service on 15 routes, busiest San Francisco to Ontario. Of 845 departures recorded from October 2024 to July 2026, 80.0% left on time, according to the US BTS.
- On-time departures80.0%of 845 flights
- Average delay10.8 min
- July 202631▼ 45.6%vs July 2025
- Cancelled0.5%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 37 | 31 | ▼ 16.2% |
| February | 24 | 40 | ▲ 66.7% |
| March | 22 | 84 | ▲ 281.8% |
| April | 21 | 56 | ▲ 166.7% |
| May | 39 | 51 | ▲ 30.8% |
| June | 59 | 30 | ▼ 49.2% |
| July | 57 | 31 | ▼ 45.6% |
| August | 50 | – | – |
| September | 40 | – | – |
| October | 29 | – | in progress |
| November | 19 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 259 | 323 | ▲ 24.7% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 78.4% | 87.1% | ▲ 11.1% |
| February | 79.2% | 80.0% | ▲ 1.0% |
| March | 86.4% | 80.5% | ▼ 6.8% |
| April | 100.0% | 71.4% | ▼ 28.6% |
| May | 76.9% | 64.7% | ▼ 15.9% |
| June | 71.2% | 76.7% | ▲ 7.7% |
| July | 82.5% | 77.4% | ▼ 6.1% |
| August | 92.0% | – | – |
| September | 90.0% | – | – |
| October | 79.3% | – | in progress |
| November | 89.5% | – | – |
| December | 73.3% | – | – |
| Year-to-date average (Jan–Jul) | 82.1% | 76.8% | ▼ 6.4% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 0 | 2 |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.5% 841
- Cancelled 0.5% 4
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SFO ONT San Francisco International Airport – Ontario International Airport | 585 | 8.1 min | 82.4% | 194 |
| SFO PHL San Francisco International Airport – Philadelphia International Airport | 4,048 | 2.9 min | 87.9% | 174 |
| LAX SFO Los Angeles International Airport – San Francisco International Airport | 543 | 8.3 min | 80.7% | 155 |
| PIT SFO Pittsburgh International Airport – San Francisco International Airport | 3,618 | 13.8 min | 81.4% | 130 |
| MSP SFO Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field – San Francisco International Airport | 2,551 | 26.7 min | 65.3% | 98 |
| ONT SFO Ontario International Airport – San Francisco International Airport | 585 | 18.9 min | 57.1% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 30 | 30 | 70.0% | 0 |
| December 2024 | 44 | 43 | 86.1% | 1 |
| January 2025 | 37 | 37 | 78.4% | 0 |
| February 2025 | 24 | 24 | 79.2% | 0 |
| March 2025 | 22 | 22 | 86.4% | 0 |
| April 2025 | 21 | 21 | 100.0% | 0 |
| May 2025 | 39 | 39 | 76.9% | 0 |
| June 2025 | 59 | 59 | 71.2% | 0 |
| July 2025 | 57 | 57 | 82.5% | 0 |
| August 2025 | 50 | 50 | 92.0% | 0 |
| September 2025 | 40 | 40 | 90.0% | 0 |
| October 2025 | 29 | 29 | 79.3% | 0 |
| November 2025 | 19 | 19 | 89.5% | 0 |
| December 2025 | 31 | 30 | 73.3% | 1 |
| January 2026 | 31 | 31 | 87.1% | 0 |
| February 2026 | 40 | 40 | 80.0% | 0 |
| March 2026 | 84 | 82 | 80.5% | 2 |
| April 2026 | 56 | 56 | 71.4% | 0 |
| May 2026 | 51 | 51 | 64.7% | 0 |
| June 2026 | 30 | 30 | 76.7% | 0 |
| July 2026 | 31 | 31 | 77.4% | 0 |