About 1 in 3 UA 1603 flights from Las Vegas arrived 15+ minutes late, diverted or cancelled over the past year (37%); 0.0% were cancelled. The typical flight landed 5 minutes late.
UA 1603: LAS → SFO
Scheduled to leave Las Vegas at 6:20 p.m. local time. Over the past year it arrived on time 63% of the time (229 flights), better than other UA flights on the route at that hour (59%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 34 | 59% |
| Tuesday | 31 | 58% |
| Wednesday | 31 | 68% |
| Thursday | 34 | 68% |
| Friday | 34 | 56% |
| Saturday | 31 | 71% |
| Sunday | 34 | 62% |
Why it was late
All flights LAS → SFO · Connecting off UA 1603? Check the risk
UA 1603: SFO → ATL
Scheduled to leave San Francisco at 9:20 p.m. local time. Over the past year it arrived on time 85% of the time (165 flights), in line with other UA flights on the route at that hour (86%). Last seen in the data Aug 31, 2026.
Usually United Airlines's last flight of the day from San Francisco to Atlanta (100% of days). United Airlines's last SFO–ATL flight was cancelled 0.4% of the time, against 0.0% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 8:45 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 29 | 93% |
| Tuesday | 11 | — |
| Wednesday | 28 | 82% |
| Thursday | 29 | 90% |
| Friday | 26 | 81% |
| Saturday | 13 | — |
| Sunday | 29 | 72% |
Why it was late
All flights SFO → ATL · Connecting off UA 1603? Check the risk
Questions
How often is UA 1603 from LAS to SFO late?
United Airlines 1603 from Las Vegas, NV to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 37% of 229 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
How often is UA 1603 from SFO to ATL late?
United Airlines 1603 from San Francisco, CA to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 15% of 165 scheduled flights between September 2025 and August 2026. 0.6% 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.