ON TIMEBOARD
Delta Air Lines / ATL → ORD

DL 1147 on time

Delta Air Lines 1147: Atlanta to Chicago at 9:00 a.m.; Chicago to Atlanta at 11:23 a.m. (past 12 months). Figures below the title are for ATL → ORD, its busiest leg

On time
76%
351 flights · likely 71–80%
Cancelled
2.9%
of scheduled flights
Typical arrival
−4 min
median vs schedule
When late
+46 min
average delay
Similar flights
80%
DL, same route & hour

About 1 in 4 DL 1147 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (24%); 2.9% were cancelled. The typical flight landed 4 minutes early.

DL 1147: ATL → ORD

Scheduled to leave Atlanta at 9:00 a.m. local time. Over the past year it arrived on time 76% of the time (351 flights), worse than other DL flights on the route at that hour (80%). Last seen in the data Aug 30, 2026.

Month by month

40%70%100%Sep 2025: 97% on time (30 flights)97SepOct 2025: 77% on time (31 flights)77OctNov 2025: 67% on time (30 flights)67NovDec 2025: 52% on time (31 flights)52DecJan 2026: 65% on time (31 flights)65JanFeb 2026: 79% on time (28 flights)79FebMar 2026: 52% on time (31 flights)52MarApr 2026: 77% on time (30 flights)77AprMay 2026: 85% on time (27 flights)85MayJun 2026: 93% on time (29 flights)93JunJul 2026: 87% on time (31 flights)87JulAug 2026: 91% on time (22 flights)91Aug

By day of week

DayFlightsOn time
Monday5275%
Tuesday4867%
Wednesday4888%
Thursday5281%
Friday5275%
Saturday4772%
Sunday5275%

Why it was late

Air traffic & airport (NAS) 60%Airline (crew, maintenance, ops) 35%Late inbound plane 5%Severe weather 1%

All flights ATL → ORD · Connecting off DL 1147? Check the risk

DL 1147: ORD → ATL

Scheduled to leave Chicago at 11:23 a.m. local time. Over the past year it arrived on time 77% of the time (350 flights), in line with other DL flights on the route at that hour (77%). Last seen in the data Aug 30, 2026.

Month by month

40%70%100%Sep 2025: 97% on time (30 flights)97SepOct 2025: 87% on time (31 flights)87OctNov 2025: 80% on time (30 flights)80NovDec 2025: 58% on time (31 flights)58DecJan 2026: 61% on time (31 flights)61JanFeb 2026: 89% on time (28 flights)89FebMar 2026: 48% on time (31 flights)48MarApr 2026: 80% on time (30 flights)80AprMay 2026: 85% on time (26 flights)85MayJun 2026: 90% on time (29 flights)90JunJul 2026: 68% on time (31 flights)68JulAug 2026: 82% on time (22 flights)82Aug

By day of week

DayFlightsOn time
Monday5279%
Tuesday4875%
Wednesday4881%
Thursday5279%
Friday5277%
Saturday4768%
Sunday5176%

Why it was late

Late inbound plane 52%Air traffic & airport (NAS) 20%Airline (crew, maintenance, ops) 19%Severe weather 8%

All flights ORD → ATL · Connecting off DL 1147? Check the risk

Questions

How often is DL 1147 from ATL to ORD late?

Delta Air Lines 1147 from Atlanta, GA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 24% of 351 scheduled flights between September 2025 and August 2026. 2.9% were cancelled.

How often is DL 1147 from ORD to ATL late?

Delta Air Lines 1147 from Chicago, IL to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 23% of 350 scheduled flights between September 2025 and August 2026. 3.1% 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.