Flight number record
DL 1199
Delta Air Lines · Atlanta to Chicago
- Route
- ATL → ORD
- Departs
- 22:50
- Flights
- 328
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1199, check with Delta Air Lines.
DL 1199 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 328 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so DL 1199 runs 7 points behind the country as a whole. Across a thousand flights that is about 67 extra late arrivals.
Key figures
On time
70.6%
Arrivals under 15 minutes late, of 313 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.89%
1 hour+ late
10.2%
National rate is 8.3%
These figures cover 328 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 1199 flies
DL 1199 flies ATL to ORD without a single fixed slot. Its most common scheduled departure was 22:50, used on 79 of 328 flights, with 22:40 (56 flights) and 22:55 (50 flights) next.
- Departs 22:5079 flights24.1%
- Departs 22:4056 flights17.1%
- Departs 22:5550 flights15.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 22:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1199 runs level with that at 70.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 1199 next to ATL to ORD
Every carrier on ATL to ORD combined arrived on time 69.0% of the time across 6,493 flights, so DL 1199 is 2 points ahead of it. Delta flew 2,631 flights on the same city pair under all its flight numbers, including this one, and those ran 67.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1199thin sample | 328 | 70.6% | 72 min | 2.74% | C |
| All Delta Air Lines on ATL–ORD | 2,631 | 67.6% | 63 min | 2.20% | C |
| All carriers on ATL–ORD | 6,493 | 69.0% | 83 min | 2.40% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1199 quarter by quarter
DL 1199 did not run the same all year. Its best quarter was Apr–Jun 2026 at 75.6% on time and its weakest Oct–Dec 2025 at 62.3%, a swing of 13 points on roughly 82 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202513 flights—
- Oct–Dec 202572 flights62.3%
- Jan–Mar 202690 flights72.4%
- Apr–Jun 202691 flights75.6%
- Jul–Sep 202662 flights65.5%
Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1199 ranged from 68.1% on Friday to 73.9% on Sunday. With about 47 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1199 runs when it is late
The 92 late arrivals split 31 under half an hour, 29 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early62 flights19.8%
- Within 15 min159 flights50.8%
- 15–29 min late31 flights9.9%
- 30–59 min late29 flights9.3%
- 1–2 hours late16 flights5.1%
- 2+ hours late16 flights5.1%
Scale runs 0% to 100%.
Share of 313 completed flights by arrival against schedule.
11 of 77 late departures made up the time and arrived on time, 14% of them. In the other direction, 26 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ORD.
The worst days
Worst days for DL 1199
The latest arrival of the period was on 2 April 2026, 9 hours 42 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across April, March, May and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 April 2026 | 9 hours 42 minutes | Extreme weather |
| 10 March 2026 | 8 hours 31 minutes | National Airspace System |
| 4 May 2026 | 3 hours 44 minutes | National Airspace System |
| 26 November 2025 | 3 hours 27 minutes | Carrier |
| 29 November 2025 | 3 hours 17 minutes | Carrier |
Delay causes
Why DL 1199 runs late
National Airspace System accounts for 44% of the 6,613 delay minutes carriers reported here, and the remaining four split what is left.
- 44%National Airspace System
- 35%Carrier
- 12%Late-arriving aircraft
- 10%Extreme weather
The largest share of delay minutes, 35%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,293 of the 6,613 delay minutes reported here. The split is drawn from 6,613 delay minutes reported on DL 1199.
Cancellations run at 2.74%, against 1.89% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 606 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 328 flights under DL 1199 in the data flew ATL to ORD. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 328 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 1199
For a booking, the cancellation rate is the figure to plan around on DL 1199: 2.74% of its 328 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to ORD, every carrier and departure
- ORD to ATL, the return direction
- Delta Air Lines 2738 on the same route57.6%
- United Airlines 516 on the same route70.8%
- Delta Air Lines 1477 on the same route72.9%
- Delta Air Lines 1147 on the same route79.0%
- Delta Air Lines 2879 on the same route45.6%
- Frontier Airlines 1441 on the same route72.7%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.