ON TIMEBOARD
Delta Air Lines / ATL → IAD

DL 2135 on time

Delta Air Lines 2135: Atlanta to Washington at 12:17 p.m.; Washington to Atlanta at 3:02 p.m. (past 12 months). Figures below the title are for ATL → IAD, its busiest leg

On time
83%
145 flights · likely 76–88%
Cancelled
0.0%
of scheduled flights
Typical arrival
−7 min
median vs schedule
When late
+80 min
average delay
Similar flights
83%
DL, same route & hour

About 1 in 6 DL 2135 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (17%); 0.0% were cancelled. The typical flight landed 7 minutes early.

DL 2135: ATL → IAD

Scheduled to leave Atlanta at 12:17 p.m. local time. Over the past year it arrived on time 83% of the time (145 flights), in line with other DL flights on the route at that hour (83%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jan 2026: too few flights (4 flights)JanApr 2026: 78% on time (18 flights)78AprMay 2026: 97% on time (31 flights)97MayJun 2026: 87% on time (30 flights)87JunJul 2026: 74% on time (31 flights)74JulAug 2026: 77% on time (31 flights)77Aug

By day of week

DayFlightsOn time
Monday2181%
Tuesday2277%
Wednesday2282%
Thursday2090%
Friday2085%
Saturday2085%
Sunday2080%

Why it was late

Airline (crew, maintenance, ops) 60%Air traffic & airport (NAS) 20%Late inbound plane 15%Severe weather 4%

All flights ATL → IAD · Connecting off DL 2135? Check the risk

DL 2135: IAD → ATL

Scheduled to leave Washington at 3:02 p.m. local time. Over the past year it arrived on time 71% of the time (145 flights), worse than other DL flights on the route at that hour (75%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jan 2026: too few flights (4 flights)JanApr 2026: 83% on time (18 flights)83AprMay 2026: 87% on time (31 flights)87MayJun 2026: 77% on time (30 flights)77JunJul 2026: 48% on time (31 flights)48JulAug 2026: 65% on time (31 flights)65Aug

By day of week

DayFlightsOn time
Monday2176%
Tuesday2268%
Wednesday2277%
Thursday2075%
Friday2065%
Saturday2080%
Sunday2055%

Why it was late

Air traffic & airport (NAS) 41%Late inbound plane 38%Airline (crew, maintenance, ops) 16%Severe weather 5%

All flights IAD → ATL · Connecting off DL 2135? Check the risk

Questions

How often is DL 2135 from ATL to IAD late?

Delta Air Lines 2135 from Atlanta, GA to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 17% of 145 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.

How often is DL 2135 from IAD to ATL late?

Delta Air Lines 2135 from Washington, DC to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 29% of 145 scheduled flights between September 2025 and August 2026. 0.7% 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.