About 1 in 2 AA 3243 flights from Harrisburg arrived 15+ minutes late, diverted or cancelled over the past year (42%); 4.2% were cancelled. The typical flight landed 4 minutes late.
AA 3243: MDT → ORD
Scheduled to leave Harrisburg at 6:43 p.m. local time. Over the past year it arrived on time 58% of the time (120 flights), better than other AA flights on the route at that hour (50%). Last seen in the data Aug 4, 2026.
Usually American Airlines's last flight of the day from Harrisburg to Chicago (100% of days). American Airlines's last MDT–ORD flight was cancelled 4.7% of the time, against 2.0% for its earlier ones. If it's cancelled, the next American Airlines flight is usually around 6:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 17 | — |
| Tuesday | 18 | — |
| Wednesday | 17 | — |
| Thursday | 17 | — |
| Friday | 17 | — |
| Saturday | 17 | — |
| Sunday | 17 | — |
Why it was late
All flights MDT → ORD · Connecting off AA 3243? Check the risk
AA 3243: ORD → MDT
Scheduled to leave Chicago at 3:04 p.m. local time. Over the past year it arrived on time 72% of the time (120 flights), better than other AA flights on the route at that hour (65%). Last seen in the data Aug 4, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 17 | — |
| Tuesday | 18 | — |
| Wednesday | 17 | — |
| Thursday | 17 | — |
| Friday | 17 | — |
| Saturday | 17 | — |
| Sunday | 17 | — |
Why it was late
All flights ORD → MDT · Connecting off AA 3243? Check the risk
Questions
How often is AA 3243 from MDT to ORD late?
American Airlines 3243 from Harrisburg, PA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 42% of 120 scheduled flights between September 2025 and August 2026. 4.2% were cancelled.
How often is AA 3243 from ORD to MDT late?
American Airlines 3243 from Chicago, IL to Harrisburg, PA arrived 15 or more minutes late, was diverted or was cancelled on 28% of 120 scheduled flights between September 2025 and August 2026. 1.7% 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 American Airlines for today's flight. Method.