Atlanta (ATL) to St. Louis (STL): On-Time Performance
Data through May 2026
Atlanta (ATL) to St. Louis (STL) effectively runs on two schedules. In October 2024, 93% of arrivals were on time; in July 2024 that fell to 64% — a 29-point seasonal swing. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 74%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 10
- last 12 months
- Duration
- 1h 42m
- scheduled
- Distance
- 484 mi
Best airline from ATL to STL
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 83% | 11 min | 1.6% | 4,577 |
| Southwest Airlines | 81% | 11 min | 1.0% | 2,343 |
| Frontier Airlines | 70% | 18 min | 1.6% | 185 |
Monthly on-time trend
Best time to fly from ATL to STL
Aim for departures around 6 a.m. (93% on-time); avoid 8 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 13 min |
| Tuesdaybest | 86% | 9 min |
| Wednesday | 86% | 8 min |
| Thursday | 83% | 10 min |
| Friday | 82% | 11 min |
| Saturday | 83% | 11 min |
| Sunday | 73% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations47%
- National airspace system12%
- Weather4%
Frequently asked questions
- How often are flights from ATL to STL delayed?
- 18% of ATL–STL 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 11 minutes.
- Which airline is most reliable from ATL to STL?
- Delta Air Lines has the best on-time record on this route at 83%, based on 4,577 flights. 3 airlines flew ATL–STL frequently enough to compare in this period.
- What is the best time of day to fly from ATL to STL?
- Departures around 6 a.m. have the best record (93% on-time), while departures around 8 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to STL?
- The scheduled ATL–STL flight time averages 1h 42m over 484 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are ATL to STL flights cancelled?
- 1.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from ATL to STL?
- July 2024 was the roughest month in this dataset, with only 64% of arrivals on time. The best was October 2024 at 93%. If your dates are flexible, that 29-point gap is worth planning around.
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Based on 7,105 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.