Flight profile · United Airlines
UA638
San Francisco (SFO) to Honolulu (HNL) · scheduled 7:10 PM – 9:44 PM
How UA638 performs
677 operations, 2023-10-29 to 2026-06-30.
UA638 arrived on time 89.8% of the time, against 80.1% for all SFO → HNL flights — this specific departure is 9.7 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 6.9 points better.
Source: US DOT Bureau of Transportation Statistics · 677 operations between 2023-10-29 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA638 | 89.8% | 0.15% | -11 min | 3.8% | 677 |
| United Airlines on SFO → HNL | 82.9% | 0.31% | -8 min | 5.9% | 5,147 |
| All SFO → HNL flights | 80.1% | 1.05% | -5 min | 5.8% | 7,530 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-10-29 to 2026-06-30
Other routes UA638 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DEN→LAX Denver to Los Angeles | 2026-02-12 – 2026-03-04 | 21 | — |
| PHL→DEN Philadelphia to Denver | 2026-01-06 – 2026-02-11 | 37 | — |
| MSY→SFO New Orleans to San Francisco | 2025-12-18 – 2026-01-05 | 15 | — |
| ABQ→SFO Albuquerque to San Francisco | 2025-10-26 – 2025-12-01 | 30 | — |
| DEN→FAI Denver to Fairbanks | 2025-09-07 – 2025-09-24 | 18 | — |
| DEN→BOI Denver to Boise | 2025-08-19 – 2025-09-01 | 14 | — |
| DEN→PHX Denver to Phoenix | 2025-02-13 – 2025-03-05 | 21 | — |
| FLL→CLE Fort Lauderdale to Cleveland | 2025-01-07 – 2025-02-12 | 37 | — |
| DEN→IAD Denver to Washington | 2024-08-19 – 2024-09-25 | 38 | — |
| COS→DEN Colorado Springs to Denver | 2024-03-07 – 2024-03-29 | 20 | — |
| SFO→EWR San Francisco to Newark | 2024-03-09 – 2024-03-09 | 1 | — |
| EWR→RSW Newark to Fort Myers | 2024-02-15 – 2024-03-06 | 21 | — |
| LGA→ORD New York to Chicago | 2024-01-09 – 2024-02-14 | 36 | — |
| HNL→SFO Honolulu to San Francisco | 2023-12-20 – 2024-01-08 | 20 | — |
| EGE→IAH Eagle to Houston | 2023-12-14 – 2023-12-19 | 6 | — |
| DCA→ORD Washington to Chicago | 2023-09-29 – 2023-10-28 | 30 | — |
| MCO→ORD Orlando to Chicago | 2023-07-01 – 2023-09-28 | 90 | 83.3% |
| ORD→MCI Chicago to Kansas City | 2023-08-01 – 2023-09-04 | 34 | — |
| ORD→LAS Chicago to Las Vegas | 2023-07-02 – 2023-07-31 | 26 | — |
Because the same number has served different journeys, the statistics above describe only the route UA638 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 677 records of UA638 operating SFO → HNL, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.