About 1 in 4 UA 1738 flights from Washington arrived 15+ minutes late, diverted or cancelled over the past year (24%); 2.1% were cancelled. The typical flight landed 6 minutes early.
UA 1738: IAD → ORD
Scheduled to leave Washington at 10:30 p.m. local time. Over the past year it arrived on time 76% of the time (339 flights), in line with other UA flights on the route at that hour (76%). Last seen in the data Aug 10, 2026.
Usually United Airlines's last flight of the day from Washington to Chicago (99% of days). United Airlines's last IAD–ORD flight was cancelled 1.9% of the time, against 0.7% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 6:10 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 50 | 74% |
| Tuesday | 49 | 82% |
| Wednesday | 49 | 78% |
| Thursday | 48 | 79% |
| Friday | 49 | 73% |
| Saturday | 45 | 69% |
| Sunday | 49 | 78% |
Why it was late
All flights IAD → ORD · Connecting off UA 1738? Check the risk
Questions
How often is UA 1738 from IAD to ORD late?
United Airlines 1738 from Washington, DC to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 24% of 339 scheduled flights between September 2025 and August 2026. 2.1% 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.