About 1 in 8 UA 638 flights from San Francisco arrived 15+ minutes late, diverted or cancelled over the past year (13%); 0.0% were cancelled. The typical flight landed 10 minutes early.
UA 638: SFO → HNL
Scheduled to leave San Francisco at 7:00 p.m. local time. Over the past year it arrived on time 87% of the time (262 flights), better than other UA flights on the route at that hour (84%). Last seen in the data Aug 10, 2026.
Usually United Airlines's last flight of the day from San Francisco to Honolulu (100% of days). United Airlines's last SFO–HNL flight was cancelled 0.3% of the time, against 0.1% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 7:05 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 38 | 87% |
| Tuesday | 36 | 92% |
| Wednesday | 36 | 92% |
| Thursday | 38 | 89% |
| Friday | 38 | 87% |
| Saturday | 38 | 79% |
| Sunday | 38 | 84% |
Why it was late
All flights SFO → HNL · Connecting off UA 638? Check the risk
Questions
How often is UA 638 from SFO to HNL late?
United Airlines 638 from San Francisco, CA to Honolulu, HI arrived 15 or more minutes late, was diverted or was cancelled on 13% of 262 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.