UA638
UA638 (United Airlines) is a multi-stop service on 9 routes, busiest San Francisco to Honolulu. Of 698 departures recorded from October 2024 to July 2026, 82.8% left on time, according to the US BTS.
- On-time departures82.8%of 698 flights
- Average delay9.8 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.3%
- Legs flown under this number9
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 | 31 | 35 | ▲ 12.9% |
| February | 28 | 28 | 0.0% |
| March | 31 | 31 | 0.0% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 25 | – | – |
| October | 36 | – | in progress |
| November | 54 | – | – |
| December | 43 | – | – |
| Year to date (Jan–Jul) | 212 | 216 | ▲ 1.9% |
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 | 93.6% | 67.7% | ▼ 27.7% |
| February | 89.3% | 85.7% | ▼ 4.0% |
| March | 90.3% | 93.6% | ▲ 3.6% |
| April | 93.3% | 93.3% | 0.0% |
| May | 93.6% | 74.2% | ▼ 20.7% |
| June | 96.7% | 60.0% | ▼ 37.9% |
| July | 96.7% | 54.8% | ▼ 43.3% |
| August | 71.0% | – | – |
| September | 88.0% | – | – |
| October | 80.6% | – | in progress |
| November | 81.5% | – | – |
| December | 74.4% | – | – |
| Year-to-date average (Jan–Jul) | 93.3% | 75.6% | ▼ 19.0% |
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 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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 99.7% 696
- Cancelled 0.3% 2
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SFO HNL San Francisco International Airport – Daniel K. Inouye International Airport | 3,857 | 8.4 min | 83.5% | 505 |
| PHL DEN Philadelphia International Airport – Denver International Airport | 2,501 | 16.6 min | 83.3% | 37 |
| FLL CLE Fort Lauderdale Hollywood International Airport – Cleveland Hopkins International Airport | 1,713 | -4.0 min | 97.3% | 37 |
| ABQ SFO Albuquerque International Sunport – San Francisco International Airport | 1,439 | 16.2 min | 70.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 30 | 30 | 86.7% | 0 |
| December 2024 | 31 | 31 | 74.2% | 0 |
| January 2025 | 31 | 31 | 93.6% | 0 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 31 | 31 | 90.3% | 0 |
| April 2025 | 30 | 30 | 93.3% | 0 |
| May 2025 | 31 | 31 | 93.6% | 0 |
| June 2025 | 30 | 30 | 96.7% | 0 |
| July 2025 | 31 | 30 | 96.7% | 1 |
| August 2025 | 31 | 31 | 71.0% | 0 |
| September 2025 | 25 | 25 | 88.0% | 0 |
| October 2025 | 36 | 36 | 80.6% | 0 |
| November 2025 | 54 | 54 | 81.5% | 0 |
| December 2025 | 43 | 43 | 74.4% | 0 |
| January 2026 | 35 | 34 | 67.7% | 1 |
| February 2026 | 28 | 28 | 85.7% | 0 |
| March 2026 | 31 | 31 | 93.6% | 0 |
| April 2026 | 30 | 30 | 93.3% | 0 |
| May 2026 | 31 | 31 | 74.2% | 0 |
| June 2026 | 30 | 30 | 60.0% | 0 |
| July 2026 | 31 | 31 | 54.8% | 0 |