Route on-time record
STL to ATL: most on-time flights and the best time to fly
St Louis (St. Louis Lambert International Airport) to Atlanta (Hartsfield Jackson Atlanta International Airport). 3,718 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 1.7% were cancelled. The most reliable flight number was Delta 1536 at 7:05 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
STL → ATL
St Louis to Atlanta: 3,718 nonstop flights a year
On time (12 months)
85%
Cancelled
1.7%
avg delay 11 min
Best time to leave
Before 9 AM
94% on time vs 72% 6 to 9 PM
Most reliable airline
Delta
87% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Delta 1536
7:05 AM → 9:39 AM1h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Delta 566; its record covers all of them.
92%
chance on time
- On time (history)
- 94%
- Cancelled
- 2.0%
- Avg arrival delay
- 5 min
- Arrived on time 94% of the time (395 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 72%).
Strong track record · 395 flights
Find Delta 1536 fares Opens this date on Aviasales#2 · Delta 1524
6:00 AM → 8:41 AM1h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 93%
- Cancelled
- 1.6%
- Avg arrival delay
- 6 min
- Arrived on time 93% of the time (357 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 72%).
Strong track record · 357 flights
Find Delta 1524 fares Opens this date on Aviasales#3 · Southwest 4427
10:15 AM → 12:50 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1941; its record covers all of them.
91%
chance on time
- On time (history)
- 94%
- Cancelled
- 1.1%
- Avg arrival delay
- 3 min
- Arrived on time 94% of the time (87 flights, Jun 2025 to May 2026).
Moderate track record · 87 flights
Find Southwest 4427 fares Opens this date on Aviasales#4 · Delta 1571
10:12 AM → 12:46 PM1h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 93%
- Cancelled
- 3.1%
- Avg arrival delay
- 4 min
- Arrived on time 93% of the time (309 flights, Jun 2025 to May 2026).
- Cancelled 3.1% of the time (10 of 319).
Strong track record · 309 flights
Find Delta 1571 fares Opens this date on Aviasales#5 · Delta 1102
1:27 PM → 4:02 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 90% of the time (20 flights, Jun 2025 to May 2026).
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find Delta 1102 fares Opens this date on Aviasales#6 · Delta 1400
12:04 PM → 2:35 PM1h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 86%
- Cancelled
- 2.7%
- Avg arrival delay
- 18 min
- Arrived on time 86% of the time (143 flights, Jun 2025 to May 2026).
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 143 flights
Find Delta 1400 fares Opens this date on Aviasales#7 · Southwest 461
3:10 PM → 5:45 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-27. Same departure also flew as Southwest 3987; its record covers all of them.
82%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 83% of the time (29 flights, Jun 2025 to May 2026).
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (29 flights), so its score leans on the airline's record at this hour.
Limited track record · 29 flights
Find Southwest 461 fares Opens this date on Aviasales#8 · Delta 1485
5:20 PM → 7:59 PM1h 39m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 82%
- Cancelled
- 1.5%
- Avg arrival delay
- 13 min
- Arrived on time 82% of the time (263 flights, Jun 2025 to May 2026).
Strong track record · 263 flights
Find Delta 1485 fares Opens this date on Aviasales#9 · Delta 543
4:41 PM → 6:52 PM1h 34m nonstop
Local times, typical schedule. Last flown 2026-05-06.
81%
chance on time
- On time (history)
- 83%
- Cancelled
- 3.6%
- Avg arrival delay
- 9 min
- Arrived on time 83% of the time (80 flights, Jun 2025 to May 2026).
- Cancelled 3.6% of the time (3 of 83).
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 80 flights
Find Delta 543 fares Opens this date on Aviasales#10 · Delta 1393
6:59 PM → 9:44 PM1h 45m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 82%
- Cancelled
- 4.2%
- Avg arrival delay
- 18 min
- Arrived on time 82% of the time (203 flights, Jun 2025 to May 2026).
- Cancelled 4.2% of the time (9 of 212).
- Leaves in this route's least on-time window (6 to 9 PM: 72% on time; Before 9 AM: 94%).
Strong track record · 203 flights
Find Delta 1393 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines87%
2,380 flights · 89% on time as flown · 2.0% cancel
- Southwest Airlines81%
1,154 flights · 81% on time as flown · 1.2% cancel
- Frontier Airlines67%
184 flights · 62% on time as flown · 1.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
983 flights · avg delay 6 min
- 9 AM to noon90%
842 flights · avg delay 7 min
- Noon to 3 PM83%
515 flights · avg delay 12 min
- 3 to 6 PM79%
885 flights · avg delay 14 min
- 6 to 9 PM72%
489 flights · avg delay 26 min
Best day: Wednesday (89%). Worst: Sunday (81%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft44%
- Airline (crew, maintenance, boarding)33%
- Air traffic control and airport volume17%
- Severe weather6%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
STL to ATL questions
- What time of day is best to fly STL to ATL?
- Before 9 AM: 94% of flights arrived on time, against 72% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from STL to ATL?
- Delta, with a season-adjusted 87% chance of operating and arriving on time over 2,380 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on STL to ATL?
- July (75% on time); the best was September (92%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from STL
- ATL to STL (return)
- STL to DEN 75%
- STL to ORD 71%
- STL to LGA 75%
- STL to MCO 78%
- STL to DCA 73%
- STL to DFW 74%
- STL to PHX 76%
- STL to LAS 79%
- STL to DAL 77%
- STL to DTW 83%
- STL to MSP 80%
- STL to CLT 83%
Live status: FAA delays and ground stops