About 1 in 5 UA 3573 flights from St. Louis arrived 15+ minutes late, diverted or cancelled over the past year (21%); 6.0% were cancelled. The typical flight landed 16 minutes early.
UA 3573: STL → EWR
Scheduled to leave St. Louis at 12:23 p.m. local time, operated by Republic Airways as YX 3573. Over the past year it arrived on time 79% of the time (217 flights), in line with other UA flights on the route at that hour (78%). Last seen in the data Aug 10, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 31 | 61% |
| Tuesday | 31 | 77% |
| Wednesday | 31 | 87% |
| Thursday | 31 | 77% |
| Friday | 31 | 90% |
| Saturday | 31 | 77% |
| Sunday | 31 | 84% |
Why it was late
All flights STL → EWR · Connecting off UA 3573? Check the risk
Questions
How often is UA 3573 from STL to EWR late?
United Airlines 3573 from St. Louis, MO to Newark, NJ arrived 15 or more minutes late, was diverted or was cancelled on 21% of 217 scheduled flights between September 2025 and August 2026. 6.0% 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.