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Delta Air Lines / ATL → STL

DL 1400 on time

Delta Air Lines 1400: Atlanta to St. Louis at 9:04 a.m.; St. Louis to Atlanta at 10:51 a.m. (past 12 months). Figures below the title are for ATL → STL, its busiest leg

On time
86%
239 flights · likely 81–90%
Cancelled
1.7%
of scheduled flights
Typical arrival
−8 min
median vs schedule
When late
+62 min
average delay
Similar flights
91%
DL, same route & hour

About 1 in 7 DL 1400 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (14%); 1.7% were cancelled. The typical flight landed 8 minutes early.

DL 1400: ATL → STL

Scheduled to leave Atlanta at 9:04 a.m. local time. Over the past year it arrived on time 86% of the time (239 flights), worse than other DL flights on the route at that hour (91%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jan 2026: 59% on time (27 flights)59JanFeb 2026: 82% on time (28 flights)82FebMar 2026: 77% on time (31 flights)77MarApr 2026: 97% on time (30 flights)97AprMay 2026: 84% on time (31 flights)84MayJun 2026: 93% on time (30 flights)93JunJul 2026: 94% on time (31 flights)94JulAug 2026: 100% on time (31 flights)100Aug

By day of week

DayFlightsOn time
Monday3580%
Tuesday3488%
Wednesday3491%
Thursday3482%
Friday3494%
Saturday3479%
Sunday3488%

Why it was late

Airline (crew, maintenance, ops) 63%Late inbound plane 23%Air traffic & airport (NAS) 11%Severe weather 3%

All flights ATL → STL · Connecting off DL 1400? Check the risk

DL 1400: STL → ATL

Scheduled to leave St. Louis at 10:51 a.m. local time. Over the past year it arrived on time 87% of the time (239 flights), worse than other DL flights on the route at that hour (91%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jan 2026: 70% on time (27 flights)70JanFeb 2026: 89% on time (28 flights)89FebMar 2026: 74% on time (31 flights)74MarApr 2026: 93% on time (30 flights)93AprMay 2026: 90% on time (31 flights)90MayJun 2026: 87% on time (30 flights)87JunJul 2026: 97% on time (31 flights)97JulAug 2026: 97% on time (31 flights)97Aug

By day of week

DayFlightsOn time
Monday3586%
Tuesday3485%
Wednesday3491%
Thursday3491%
Friday3494%
Saturday3479%
Sunday3485%

Why it was late

Airline (crew, maintenance, ops) 53%Late inbound plane 42%Air traffic & airport (NAS) 4%

All flights STL → ATL · Connecting off DL 1400? Check the risk

Questions

How often is DL 1400 from ATL to STL late?

Delta Air Lines 1400 from Atlanta, GA to St. Louis, MO arrived 15 or more minutes late, was diverted or was cancelled on 14% of 239 scheduled flights between September 2025 and August 2026. 1.7% were cancelled.

How often is DL 1400 from STL to ATL late?

Delta Air Lines 1400 from St. Louis, MO to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 13% of 239 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 Delta Air Lines for today's flight. Method.