Chicago (ORD) to Chattanooga (CHA): On-Time Performance
Data through May 2026
The calendar drives reliability on ORD–CHA. October 2024 flights landed on schedule 88% of the time, but March 2025 dropped to 50% — a gap of 38 points. Across the full period the route averages 73% on-time against a national 78%.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 2.9%
- Flights/day
- 2.6
- last 12 months
- Duration
- 1h 51m
- scheduled
- Distance
- 501 mi
Best airline from ORD to CHA
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 79% | 16 min | 2.9% | 175 |
| Republic Airways | 72% | 21 min | 2.9% | 385 |
| SkyWest Airlines | 72% | 21 min | 2.9% | 1,227 |
Monthly on-time trend
Best time to fly from ORD to CHA
Aim for departures around 8 a.m. (79% on-time); avoid 5 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 17 min |
| Tuesday | 75% | 25 min |
| Wednesday | 76% | 17 min |
| Thursday | 72% | 21 min |
| Friday | 72% | 24 min |
| Saturdaybest | 78% | 16 min |
| Sunday | 62% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft33%
- Airline operations41%
- National airspace system18%
- Weather8%
Frequently asked questions
- How often are flights from ORD to CHA delayed?
- 27% of ORD–CHA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 21 minutes.
- Which airline is most reliable from ORD to CHA?
- Envoy Air has the best on-time record on this route at 79%, based on 175 flights. 3 airlines flew ORD–CHA frequently enough to compare in this period.
- What is the best time of day to fly from ORD to CHA?
- Departures around 8 a.m. have the best record (79% on-time), while departures around 5 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to CHA?
- The scheduled ORD–CHA flight time averages 1h 51m over 501 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are ORD to CHA flights cancelled?
- 2.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from ORD to CHA?
- March 2025 was the roughest month in this dataset, with only 50% of arrivals on time. The best was October 2024 at 88%. If your dates are flexible, that 38-point gap is worth planning around.
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Based on 1,787 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.