ON TIMEBOARD
Delta Air Lines / AEX → ATL

DL 4991 on time

Delta Air Lines 4991: Alexandria to Atlanta at 11:46 a.m.; Atlanta to Alexandria at 10:15 a.m. (past 12 months). Figures below the title are for AEX → ATL, its busiest leg

On time
74%
239 flights · likely 68–79%
Cancelled
1.7%
of scheduled flights
Typical arrival
−7 min
median vs schedule
When late
+94 min
average delay
Similar flights
79%
DL, same route & hour

About 1 in 4 DL 4991 flights from Alexandria arrived 15+ minutes late, diverted or cancelled over the past year (26%); 1.7% were cancelled. The typical flight landed 7 minutes early.

DL 4991: AEX → ATL

Scheduled to leave Alexandria at 11:46 a.m. local time, operated by Endeavor Air as 9E 4991. Over the past year it arrived on time 74% of the time (239 flights), worse than other DL flights on the route at that hour (79%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Apr 2025: 83% on time (30 flights)83AprMay 2025: 71% on time (31 flights)71MayJun 2025: too few flights (12 flights)JunJul 2025: too few flights (6 flights)JulJan 2026: 63% on time (27 flights)63JanFeb 2026: 86% on time (28 flights)86FebMar 2026: 71% on time (31 flights)71MarApr 2026: 73% on time (30 flights)73AprMay 2026: 68% on time (31 flights)68MayJun 2026: 77% on time (30 flights)77JunJul 2026: 68% on time (31 flights)68JulAug 2026: 87% on time (31 flights)87Aug

By day of week

DayFlightsOn time
Monday3571%
Tuesday3474%
Wednesday3471%
Thursday3491%
Friday3471%
Saturday3468%
Sunday3474%

Why it was late

Airline (crew, maintenance, ops) 44%Late inbound plane 41%Severe weather 10%Air traffic & airport (NAS) 6%

All flights AEX → ATL · Connecting off DL 4991? Check the risk

DL 4991: ATL → AEX

Scheduled to leave Atlanta at 10:15 a.m. local time, operated by Endeavor Air as 9E 4991. Over the past year it arrived on time 84% of the time (239 flights), in line with other DL flights on the route at that hour (87%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Apr 2025: 90% on time (30 flights)90AprMay 2025: 81% on time (31 flights)81MayJun 2025: too few flights (12 flights)JunJul 2025: too few flights (6 flights)JulJan 2026: 74% on time (27 flights)74JanFeb 2026: 89% on time (28 flights)89FebMar 2026: 81% on time (31 flights)81MarApr 2026: 83% on time (30 flights)83AprMay 2026: 77% on time (31 flights)77MayJun 2026: 93% on time (30 flights)93JunJul 2026: 81% on time (31 flights)81JulAug 2026: 94% on time (31 flights)94Aug

By day of week

DayFlightsOn time
Monday3580%
Tuesday3485%
Wednesday3482%
Thursday3491%
Friday3494%
Saturday3474%
Sunday3482%

Why it was late

Airline (crew, maintenance, ops) 48%Late inbound plane 31%Air traffic & airport (NAS) 15%Severe weather 5%

All flights ATL → AEX · Connecting off DL 4991? Check the risk

Questions

How often is DL 4991 from AEX to ATL late?

Delta Air Lines 4991 from Alexandria, LA to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 26% of 239 scheduled flights between September 2025 and August 2026. 1.7% were cancelled.

How often is DL 4991 from ATL to AEX late?

Delta Air Lines 4991 from Atlanta, GA to Alexandria, LA arrived 15 or more minutes late, was diverted or was cancelled on 16% of 239 scheduled flights between September 2025 and August 2026. 1.3% 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.