About 1 in 2 UA 3688 flights from New York arrived 15+ minutes late, diverted or cancelled over the past year (42%); 5.8% were cancelled. The typical flight landed 1 minutes early.
UA 3688: LGA → IAD
Scheduled to leave New York at 2:55 p.m. local time, operated by Republic Airways as YX 3688. Over the past year it arrived on time 58% of the time (294 flights), in line with other UA flights on the route at that hour (57%). Last seen in the data Aug 10, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 42 | 45% |
| Tuesday | 42 | 64% |
| Wednesday | 42 | 57% |
| Thursday | 42 | 52% |
| Friday | 42 | 64% |
| Saturday | 43 | 72% |
| Sunday | 41 | 49% |
Why it was late
All flights LGA → IAD · Connecting off UA 3688? Check the risk
Questions
How often is UA 3688 from LGA to IAD late?
United Airlines 3688 from New York, NY to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 42% of 294 scheduled flights between September 2025 and August 2026. 5.8% 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.