About 1 in 3 UA 356 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (29%); 2.0% were cancelled. The typical flight landed 1 minutes early.
UA 356: ORD → ATL
Scheduled to leave Chicago at 2:25 p.m. local time. Over the past year it arrived on time 71% of the time (358 flights), in line with other UA flights on the route at that hour (72%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 66% |
| Tuesday | 52 | 88% |
| Wednesday | 52 | 69% |
| Thursday | 51 | 73% |
| Friday | 52 | 65% |
| Saturday | 46 | 74% |
| Sunday | 52 | 63% |
Why it was late
All flights ORD → ATL · Connecting off UA 356? Check the risk
UA 356: PHX → ORD
Scheduled to leave Phoenix at 6:50 a.m. local time. Over the past year it arrived on time 88% of the time (198 flights), in line with other UA flights on the route at that hour (88%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 29 | 83% |
| Tuesday | 25 | 84% |
| Wednesday | 28 | 89% |
| Thursday | 29 | 93% |
| Friday | 29 | 83% |
| Saturday | 29 | 93% |
| Sunday | 29 | 90% |
Why it was late
All flights PHX → ORD · Connecting off UA 356? Check the risk
Questions
How often is UA 356 from ORD to ATL late?
United Airlines 356 from Chicago, IL to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 29% of 358 scheduled flights between September 2025 and August 2026. 2.0% were cancelled.
How often is UA 356 from PHX to ORD late?
United Airlines 356 from Phoenix, AZ to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 12% of 198 scheduled flights between September 2025 and August 2026. 1.0% 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.