Flight number record

DL 1199

Delta Air Lines · Atlanta to Chicago

Route: ATL → ORD
Departs: 22:50
Flights: 315
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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, 6 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 315 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.6%, so DL 1199 runs 6 points behind the country as a whole. Across a thousand flights that is about 62 extra late arrivals.

On time

71.4%

Arrivals under 15 minutes late, of 304 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

2.54%

National rate is 1.81%

1 hour+ late

11.2%

National rate is 8.1%

These figures cover 315 flights between July 2025 and June 2026. Beyond the headline rate, 11.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 74 of 315 flights, with 22:55 (49 flights) and 22:59 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 22:5074 flights23.5%
Departs 22:5549 flights15.6%
Departs 22:5935 flights11.1%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 70.5%, and DL 1199 runs level with that at 71.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1199 next to ATL to ORD

Every carrier on ATL to ORD combined arrived on time 70.6% of the time across 6,406 flights, so DL 1199 is about level with it. Delta flew 2,625 flights on the same city pair under all its flight numbers, including this one, and those ran 69.1% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 10 points.

DL 1199 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1199thin sample	315	71.4%	76 min	2.54%	C
All Delta Air Lines on ATL–ORD	2,625	69.1%	63 min	2.21%	C
All carriers on ATL–ORD	6,406	70.6%	81 min	2.34%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 79 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 202562 flights74.2%
Oct–Dec 202572 flights62.3%
Jan–Mar 202690 flights72.4%
Apr–Jun 202691 flights75.6%

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1199 ranged from 67.4% on Sunday to 76.9% on Saturday. With about 45 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1199 runs late

One category carries most of the weight here. National Airspace System accounts for 43% of the 6,570 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
43%
Carrier
34%
Late-arriving aircraft
14%
Extreme weather
9%

43% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,854 minutes out of 6,570, against a national NAS share of 21%. The split is drawn from 6,570 delay minutes reported on DL 1199.

Cancellations run at 2.54%, against 1.81% nationally. That is about 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 315 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. 315 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: 2.54% of its 315 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures