About 1 in 2 UA 2356 flights from Las Vegas arrived 15+ minutes late, diverted or cancelled over the past year (41%); 0.3% were cancelled. The typical flight landed 6 minutes late.
UA 2356: LAS → SFO
Scheduled to leave Las Vegas at 7:45 a.m. local time. Over the past year it arrived on time 59% of the time (346 flights), in line with other UA flights on the route at that hour (57%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 59% |
| Tuesday | 46 | 57% |
| Wednesday | 49 | 43% |
| Thursday | 50 | 52% |
| Friday | 50 | 64% |
| Saturday | 50 | 72% |
| Sunday | 50 | 66% |
Why it was late
All flights LAS → SFO · Connecting off UA 2356? Check the risk
UA 2356: SFO → BOS
Scheduled to leave San Francisco at 10:05 a.m. local time. Over the past year it arrived on time 62% of the time (328 flights), worse than other UA flights on the route at that hour (67%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 48 | 58% |
| Tuesday | 46 | 61% |
| Wednesday | 46 | 59% |
| Thursday | 47 | 64% |
| Friday | 47 | 57% |
| Saturday | 47 | 77% |
| Sunday | 47 | 60% |
Why it was late
All flights SFO → BOS · Connecting off UA 2356? Check the risk
Questions
How often is UA 2356 from LAS to SFO late?
United Airlines 2356 from Las Vegas, NV to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 41% of 346 scheduled flights between September 2025 and August 2026. 0.3% were cancelled.
How often is UA 2356 from SFO to BOS late?
United Airlines 2356 from San Francisco, CA to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 38% of 328 scheduled flights between September 2025 and August 2026. 0.9% 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.