Delta Air Lines STL to ATL on-time performance
Delta Air Lines nonstop flights from St. Louis to Atlanta · Aug 2025 – Jul 2026
On-time arrivals
89%
arrived < 15 min late
Cancelled
2.0%
48 flights
Avg arrival delay
9 min
79 min when late
Rank on route
#1 of 3
route average 85% on time
Key facts
- Delta Air Lines flights on STL to ATL arrived on time 89% of the time in Aug 2025 – Jul 2026.
- 2% were cancelled, and 4% arrived an hour or more late.
- That ranks #1 of 3 airlines on this route, which averaged 85% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (41%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)41%
- Late-arriving aircraft37%
- Air traffic control & airport congestion17%
- Extreme weather5%
- Security0%
Other airlines on STL to ATL
- Southwest Airlines80% on time · 12 min avg delay
- Frontier Airlines60% on time · 40 min avg delay
Full STL to ATL comparison →
Delta Air Lines on-time record across all routes →
2,357 Delta Air Lines flights tracked on this route; 48 cancelled, 6 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.