About 1 in 2 UA 504 flights from Baltimore arrived 15+ minutes late, diverted or cancelled over the past year (47%); 1.6% were cancelled. The typical flight landed 10 minutes late.
UA 504: BWI → SFO
Scheduled to leave Baltimore at 6:59 p.m. local time. Over the past year it arrived on time 53% of the time (187 flights), worse than other UA flights on the route at that hour (59%). Last seen in the data Aug 31, 2026.
Usually United Airlines's last flight of the day from Baltimore to San Francisco (100% of days). United Airlines's last BWI–SFO flight was cancelled 1.1% of the time, against 0.7% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 6:38 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 34 | 41% |
| Tuesday | 4 | — |
| Wednesday | 22 | 55% |
| Thursday | 34 | 47% |
| Friday | 34 | 47% |
| Saturday | 25 | 84% |
| Sunday | 34 | 53% |
Why it was late
All flights BWI → SFO · Connecting off UA 504? Check the risk
Questions
How often is UA 504 from BWI to SFO late?
United Airlines 504 from Baltimore, MD to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 47% of 187 scheduled flights between September 2025 and August 2026. 1.6% 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.