About 1 in 3 UA 4945 flights from Washington arrived 15+ minutes late, diverted or cancelled over the past year (30%); 5.6% were cancelled. The typical flight landed 6 minutes early.
UA 4945: IAD → ITH
Scheduled to leave Washington at 5:25 p.m. local time, operated by CommutAir as C5 4945. Over the past year it arrived on time 70% of the time (356 flights), in line with other UA flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 69% |
| Tuesday | 52 | 81% |
| Wednesday | 51 | 67% |
| Thursday | 51 | 76% |
| Friday | 50 | 66% |
| Saturday | 50 | 68% |
| Sunday | 51 | 61% |
Why it was late
All flights IAD → ITH · Connecting off UA 4945? Check the risk
Questions
How often is UA 4945 from IAD to ITH late?
United Airlines 4945 from Washington, DC to Ithaca/Cortland, NY arrived 15 or more minutes late, was diverted or was cancelled on 30% of 356 scheduled flights between September 2025 and August 2026. 5.6% 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.