Flight profile · United Airlines
UA1721
San Francisco (SFO) to Kailua-Kona (KOA) · scheduled 9:05 AM – 11:31 AM
How UA1721 performs
1,089 operations, 2023-07-01 to 2026-06-30.
Source: US DOT Bureau of Transportation Statistics · 1,089 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1721 | 84.0% | 0.28% | -8 min | 7.1% | 1,089 |
| United Airlines on SFO → KOA | 83.8% | 0.30% | -7 min | 5.0% | 2,344 |
| All SFO → KOA flights | 84.4% | 0.27% | -7 min | 4.9% | 2,573 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA1721 run worse on particular days?
Monday is historically the most reliable day and Friday the least, a gap of 8.7 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes UA1721 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 |
|---|---|---|---|
| SAN→SFO San Diego to San Francisco | 2026-02-12 – 2026-03-02 | 15 | — |
| BZN→DEN Bozeman to Denver | 2023-12-14 – 2023-12-20 | 7 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1721 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,089 records of UA1721 operating SFO → KOA, 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.