About 1 in 8 UA 591 flights from Newark arrived 15+ minutes late, diverted or cancelled over the past year (13%); 0.9% were cancelled. The typical flight landed 17 minutes early.
UA 591: EWR → SAT
Scheduled to leave Newark at 9:29 a.m. local time. Over the past year it arrived on time 87% of the time (234 flights), in line with other UA flights on the route at that hour (89%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 43 | 81% |
| Tuesday | 41 | 90% |
| Wednesday | 41 | 85% |
| Thursday | 42 | 90% |
| Friday | 43 | 86% |
| Saturday | 2 | — |
| Sunday | 22 | 86% |
Why it was late
All flights EWR → SAT · Connecting off UA 591? Check the risk
Questions
How often is UA 591 from EWR to SAT late?
United Airlines 591 from Newark, NJ to San Antonio, TX arrived 15 or more minutes late, was diverted or was cancelled on 13% of 234 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.