About 1 in 4 UA 3599 flights from Newark arrived 15+ minutes late, diverted or cancelled over the past year (28%); 5.3% were cancelled. The typical flight landed 10 minutes early.
UA 3599: EWR → PWM
Scheduled to leave Newark at 4:59 p.m. local time, operated by Republic Airways as YX 3599. Over the past year it arrived on time 72% of the time (190 flights), worse than other UA flights on the route at that hour (78%). Last seen in the data Aug 9, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 29 | 69% |
| Tuesday | 25 | 72% |
| Wednesday | 25 | 64% |
| Thursday | 30 | 73% |
| Friday | 30 | 80% |
| Saturday | 22 | 68% |
| Sunday | 29 | 72% |
Why it was late
All flights EWR → PWM · Connecting off UA 3599? Check the risk
Questions
How often is UA 3599 from EWR to PWM late?
United Airlines 3599 from Newark, NJ to Portland, ME arrived 15 or more minutes late, was diverted or was cancelled on 28% of 190 scheduled flights between September 2025 and August 2026. 5.3% 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.