ON TIMEBOARD
Delta Air Lines / ATL → BHM

DL 3100 on time

Delta Air Lines 3100: Atlanta to Birmingham at 8:05 a.m.; Birmingham to Atlanta at 9:04 a.m. (past 12 months). Figures below the title are for ATL → BHM, its busiest leg

On time
90%
346 flights · likely 87–93%
Cancelled
1.7%
of scheduled flights
Typical arrival
−11 min
median vs schedule
When late
+55 min
average delay
Similar flights
91%
DL, same route & hour

About 1 in 10 DL 3100 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (10%); 1.7% were cancelled. The typical flight landed 11 minutes early.

DL 3100: ATL → BHM

Scheduled to leave Atlanta at 8:05 a.m. local time. Over the past year it arrived on time 90% of the time (346 flights), in line with other DL flights on the route at that hour (91%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 95% on time (22 flights)95SepOct 2025: 94% on time (31 flights)94OctNov 2025: 82% on time (28 flights)82NovDec 2025: 86% on time (28 flights)86DecJan 2026: 82% on time (28 flights)82JanFeb 2026: 92% on time (25 flights)92FebMar 2026: 90% on time (31 flights)90MarApr 2026: 97% on time (30 flights)97AprMay 2026: 90% on time (31 flights)90MayJun 2026: 90% on time (30 flights)90JunJul 2026: 97% on time (31 flights)97JulAug 2026: 90% on time (31 flights)90Aug

By day of week

DayFlightsOn time
Monday5186%
Tuesday5090%
Wednesday4892%
Thursday4998%
Friday5194%
Saturday4785%
Sunday5088%

Why it was late

Airline (crew, maintenance, ops) 70%Air traffic & airport (NAS) 19%Late inbound plane 10%Security 2%

All flights ATL → BHM · Connecting off DL 3100? Check the risk

DL 3100: BHM → ATL

Scheduled to leave Birmingham at 9:04 a.m. local time. Over the past year it arrived on time 92% of the time (343 flights), in line with other DL flights on the route at that hour (92%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 95% on time (22 flights)95SepOct 2025: 96% on time (28 flights)96OctNov 2025: 89% on time (27 flights)89NovDec 2025: 82% on time (28 flights)82DecJan 2026: 87% on time (30 flights)87JanFeb 2026: 96% on time (25 flights)96FebMar 2026: 87% on time (30 flights)87MarApr 2026: 97% on time (30 flights)97AprMay 2026: 94% on time (31 flights)94MayJun 2026: 97% on time (30 flights)97JunJul 2026: 94% on time (31 flights)94JulAug 2026: 94% on time (31 flights)94Aug

By day of week

DayFlightsOn time
Monday5184%
Tuesday5092%
Wednesday4894%
Thursday48100%
Friday5198%
Saturday4388%
Sunday5288%

Why it was late

Late inbound plane 62%Airline (crew, maintenance, ops) 28%Air traffic & airport (NAS) 7%Severe weather 2%

All flights BHM → ATL · Connecting off DL 3100? Check the risk

Questions

How often is DL 3100 from ATL to BHM late?

Delta Air Lines 3100 from Atlanta, GA to Birmingham, AL arrived 15 or more minutes late, was diverted or was cancelled on 10% of 346 scheduled flights between September 2025 and August 2026. 1.7% were cancelled.

How often is DL 3100 from BHM to ATL late?

Delta Air Lines 3100 from Birmingham, AL to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 8% of 343 scheduled flights between September 2025 and August 2026. 1.8% 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.